1 | /*
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2 | * MessageRouter.java
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3 | * Copyright (C) 2002 New Zealand Digital Library, http://www.nzdl.org
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4 | *
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5 | * This program is free software; you can redistribute it and/or modify
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6 | * it under the terms of the GNU General Public License as published by
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7 | * the Free Software Foundation; either version 2 of the License, or
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8 | * (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program; if not, write to the Free Software
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17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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18 | */
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19 | package org.greenstone.gsdl3.core;
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20 |
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21 | import org.greenstone.gsdl3.util.*;
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22 | import org.greenstone.gsdl3.service.*;
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23 | import org.greenstone.gsdl3.comms.*;
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24 | import org.greenstone.gsdl3.collection.*;
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25 |
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26 | // XML classes
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27 | import org.w3c.dom.Node;
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28 | import org.w3c.dom.NodeList;
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29 | import org.w3c.dom.Document;
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30 | import org.w3c.dom.Element;
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31 | import org.xml.sax.InputSource;
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32 | import javax.xml.parsers.*;
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33 |
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34 | // other java classes
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35 | import java.io.File;
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36 | import java.io.Reader;
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37 | import java.io.StringReader;
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38 | import java.net.Authenticator;
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39 | import java.net.PasswordAuthentication;
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40 | import java.util.HashMap;
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41 | import java.util.Iterator;
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42 | import java.util.Properties;
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43 |
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44 | import org.apache.log4j.*;
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45 |
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46 | /**
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47 | * The hub of a Greenstone system.
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48 | *
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49 | * Accepts XML requests (via process method of ModuleInterface) and routes them to the appropriate collection or
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50 | * service or external entity.
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51 | *
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52 | * contains a map of module objects - may be services, collections, comms
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53 | * objects talking to other MessageRouters etc.
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54 | *
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55 | *
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56 | * @author <a href="mailto:[email protected]">Katherine Don</a>
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57 | * @version $Revision: 14534 $
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58 | * @see ModuleInterface
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59 | * @see Collection
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60 | * @see ServiceRack
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61 | * @see Communicator
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62 | *
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63 | * Since some service classes are moved into a separate directory in order for them to be checked out from a different repository,
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64 | * we modify the configureServices method to search some of the classes in other place if they are not found in the service directory.
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65 | */
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66 | public class MessageRouter implements ModuleInterface {
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67 |
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68 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.core.MessageRouter.class.getName());
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69 |
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70 | /** the (directory) name of the site */
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71 | protected String site_name = null;
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72 | /** site home - the home directory for the site */
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73 | protected String site_home=null;
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74 | /** the http address for this site */
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75 | protected String site_http_address=null;
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76 |
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77 | protected String library_name = null;
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78 |
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79 | /** map of names to Module objects */
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80 | protected HashMap module_map=null;
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81 |
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82 | /** container Document to create XML Nodes */
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83 | protected Document doc=null;
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84 | /** the full description of this site */
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85 |
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86 | // should these things be separated into local and remote??
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87 |
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88 | /** the original xml config element */
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89 | public Element config_info = null;
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90 |
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91 | /** list of collections that can be reached */
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92 | protected Element collection_list = null;
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93 |
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94 | /** list of collections that are public and OAI-supportive */
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95 | protected Element oai_collection_list = null;
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96 |
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97 | /** list of service clusters that can be reached */
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98 | protected Element cluster_list = null;
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99 | /** list of single services that can be reached */
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100 | protected Element service_list = null;
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101 | /** list of sites that can be reached */
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102 | protected Element site_list = null;
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103 |
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104 |
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105 | /** a converter class to parse XML and create Docs */
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106 | protected XMLConverter converter=null;
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107 |
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108 | //***************************************************************
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109 | // public methods
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110 | //***************************************************************
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111 |
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112 | /** constructor */
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113 | public MessageRouter() {
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114 | this.converter = new XMLConverter();
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115 | this.doc = this.converter.newDOM();
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116 | }
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117 |
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118 | public void cleanUp() {
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119 | if (this.module_map != null) {
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120 | Iterator i = this.module_map.values().iterator();
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121 | while (i.hasNext()) {
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122 | ((ModuleInterface)i.next()).cleanUp();
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123 | }
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124 | }
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125 | }
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126 |
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127 | /** site_name must be set before configure is called */
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128 | public void setSiteName(String site_name) {
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129 | this.site_name = site_name;
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130 | }
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131 | public String getSiteName() {
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132 | return this.site_name;
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133 | }
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134 |
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135 | /** site_name must be set before configure is called */
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136 | public void setLibraryName(String library_name) {
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137 | this.library_name = library_name;
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138 | }
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139 | public String getLibraryName() {
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140 | return this.library_name;
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141 | }
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142 |
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143 | /**
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144 | * configures the system
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145 | *
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146 | * looks in site_home/collect for collections, reads config file
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147 | * site_home/siteConfig.xml
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148 | *
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149 | */
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150 | public boolean configure() {
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151 |
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152 | logger.info("configuring site");
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153 |
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154 | if (this.site_name==null) {
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155 | logger.error(" You must set site_name before calling configure");
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156 | return false;
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157 | }
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158 | this.site_home = GSFile.siteHome(GlobalProperties.getGSDL3Home(), this.site_name);
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159 | this.site_http_address = GlobalProperties.getGSDL3WebAddress()+"/sites/"+this.site_name;
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160 |
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161 | // are we behind a firewall?? - is there a better place to set up the proxy?
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162 | String host = GlobalProperties.getProperty("proxy.host");
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163 | String port = GlobalProperties.getProperty("proxy.port");
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164 | final String user = GlobalProperties.getProperty("proxy.user");
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165 | final String passwd = GlobalProperties.getProperty("proxy.password");
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166 |
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167 | if (host != null && !host.equals("") && port !=null && !port.equals("")) {
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168 | System.setProperty("http.proxyType", "4");
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169 | System.setProperty("http.proxyHost", host);
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170 | System.setProperty("http.proxyPort", port);
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171 | System.setProperty("http.proxySet", "true");
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172 | // have we got a user/password?
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173 | if (user != null && !user.equals("") && passwd != null && !passwd.equals("")) {
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174 | try {
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175 | // set up the authenticator
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176 | Authenticator.setDefault(new Authenticator(){
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177 | protected PasswordAuthentication getPasswordAuthentication(){
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178 | return new PasswordAuthentication(user, new String(passwd).toCharArray());
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179 | }
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180 | });
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181 |
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182 | } catch (Exception e) {
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183 | logger.error("MessageRouter Error: couldn't set up an authenticator the proxy");
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184 |
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185 | }
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186 | }
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187 | }
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188 |
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189 | // read thru own config file - create services and connect to sites
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190 | File configFile = new File(GSFile.siteConfigFile(this.site_home));
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191 |
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192 | if (!configFile.exists() ) {
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193 | logger.error(" site config file: "+configFile.getPath()+" not found!");
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194 | return false;
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195 | }
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196 |
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197 | Document config_doc = this.converter.getDOM(configFile);
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198 | if (config_doc == null) {
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199 | logger.error(" couldn't parse site config file: "+configFile.getPath());
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200 | return false;
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201 | }
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202 |
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203 | config_info = config_doc.getDocumentElement();
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204 |
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205 | this.module_map = new HashMap();
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206 |
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207 | // load up the services: serviceRackList
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208 | Element service_rack_list = (Element)GSXML.getChildByTagName(config_info, GSXML.SERVICE_CLASS_ELEM+GSXML.LIST_MODIFIER);
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209 | configureServices(service_rack_list);
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210 |
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211 | // load up the service clusters
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212 | Element cluster_list = (Element)GSXML.getChildByTagName(config_info, GSXML.CLUSTER_ELEM+GSXML.LIST_MODIFIER);
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213 | configureClusters(cluster_list);
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214 |
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215 | // load up the collections
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216 | configureCollections();
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217 |
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218 | // load up the external sites - this also adds their services/clusters/collections to the other lists - so must be done last
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219 | Element site_list = (Element)GSXML.getChildByTagName(config_info, GSXML.SITE_ELEM+GSXML.LIST_MODIFIER);
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220 | configureSites(site_list);
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221 |
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222 |
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223 | return true;
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224 |
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225 | }
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226 |
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227 |
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228 | /**
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229 | * Process an XML request - as a String
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230 | *
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231 | * @param xml_in the request to process
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232 | * @return the response - contains any error messages
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233 | * @see String
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234 | */
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235 | public String process(String xml_in) {
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236 |
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237 | Document doc = this.converter.getDOM(xml_in);
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238 |
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239 | Element result = process(doc.getDocumentElement());
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240 | return this.converter.getString(result);
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241 | }
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242 |
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243 | /**
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244 | * Process an XML request - as a DOM Element
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245 | *
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246 | * @param xml_in the message to process - should be <message>
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247 | * @return the response - contains any error messages
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248 | * @see Element
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249 | */
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250 | public Element process(Element message) {
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251 |
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252 | logger.debug("MR received request");
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253 | //logger.info(this.converter.getString(message));
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254 | // check that its a correct message tag
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255 | if (!message.getTagName().equals(GSXML.MESSAGE_ELEM)) {
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256 | logger.error(" Invalid message. GSDL message should start with <"+GSXML.MESSAGE_ELEM+">, instead it starts with:"+message.getTagName()+".");
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257 | return null;
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258 | }
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259 |
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260 | NodeList requests = message.getElementsByTagName(GSXML.REQUEST_ELEM);
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261 |
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262 | Element mainResult = this.doc.createElement(GSXML.MESSAGE_ELEM);
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263 |
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264 | // empty request
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265 | if (requests.getLength()==0) {
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266 | logger.error("empty request");
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267 | return mainResult;
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268 | }
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269 |
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270 | Document message_doc = message.getOwnerDocument();
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271 |
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272 | // for now, just process each request one by one, and append the results to mainResult
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273 | // Note: if you add an element to another node in the same document, it
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274 | // gets removed from where it was. This changes the node list - you cant iterate over the node list in a normal manner if you are moving elements out of it
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275 | int num_requests = requests.getLength();
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276 | for (int i=0; i< num_requests; i++) {
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277 | Node result=null;
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278 | Element req = (Element)requests.item(i);
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279 | if (req == null) {
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280 | logger.error("request "+i+" is null");
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281 | continue;
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282 | }
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283 | String path = req.getAttribute(GSXML.TO_ATT); // returns "" if no att of this name
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284 | if (path.equals("")) {
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285 | // its a message for the message router
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286 | String type_att = req.getAttribute(GSXML.TYPE_ATT);
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287 | if (type_att.equals(GSXML.REQUEST_TYPE_MESSAGING)) {
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288 | // its a messaging request - modifies the requests/responses
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289 | result = modifyMessages(req, message, mainResult);
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290 | } else if (type_att.equals(OAIXML.OAI_SET_LIST)) {
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291 | logger.info("oaiSetList request received");
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292 | //this is the oai receptionist asking for a list of oai-support collections
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293 | result = this.doc.createElement(GSXML.RESPONSE_ELEM);
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294 | result.appendChild(oai_collection_list);//getCollectionList();
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295 | } else {
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296 | // standard request
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297 | result = processMessage(req);
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298 | }
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299 |
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300 | mainResult.appendChild(this.doc.importNode(result, true));
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301 | } else {
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302 | String [] modules = path.split(",");
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303 |
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304 | for (int j=0; j<modules.length; j++) {
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305 | // why can't we do this outside the loop??
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306 | Element mess = this.doc.createElement(GSXML.MESSAGE_ELEM);
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307 | Element copied_request = (Element)this.doc.importNode(req, true);
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308 | mess.appendChild(copied_request);
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309 |
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310 | String this_mod = modules[j];
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311 | // find the module to pass it on to
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312 | // need to put the request into a message element
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313 | String obj = GSPath.getFirstLink(this_mod);
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314 |
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315 | if (this.module_map.containsKey(obj)) {
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316 | copied_request.setAttribute(GSXML.TO_ATT, this_mod);
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317 | // logger.info("::::::::::::::: \n"+this.converter.getString(req));
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318 | result = ((ModuleInterface)this.module_map.get(obj)).process(mess);
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319 | if (result !=null ) {
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320 | // append the contents of the message to the mainResult - there will only be one response at this stage
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321 | Node res = GSXML.getChildByTagName(result, GSXML.RESPONSE_ELEM);
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322 | if (res != null){
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323 | mainResult.appendChild(this.doc.importNode(res, true));
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324 |
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325 | }
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326 | } else {
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327 | // add in a place holder response
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328 | Element response = this.doc.createElement(GSXML.RESPONSE_ELEM);
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329 | response.setAttribute(GSXML.FROM_ATT, this_mod);
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330 | mainResult.appendChild(response);
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331 | logger.error("MessageRouter Error: request had null result!");
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332 | }
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333 |
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334 | } else {
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335 | logger.error("MessageRouter Error: request has illegal module name in:\n"+this.converter.getString(req));
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336 | }
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337 | }
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338 | }
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339 |
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340 | } // for each request
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341 |
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342 | logger.debug("MR returned response");
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343 | logger.debug(this.converter.getString(mainResult));
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344 |
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345 | return mainResult;
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346 | }
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347 |
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348 | // ********************************************************************
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349 | // auxiliary configure methods
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350 | // *******************************************************************
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351 |
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352 |
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353 | protected boolean configureServices(Element service_rack_list) {
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354 |
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355 | this.service_list = this.doc.createElement(GSXML.SERVICE_ELEM+GSXML.LIST_MODIFIER);
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356 |
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357 | // load up the individual services
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358 | logger.info("loading service modules...");
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359 |
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360 | if (service_rack_list == null) {
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361 | logger.info("... none to be loaded");
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362 | return true;
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363 | }
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364 |
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365 | NodeList service_racks = service_rack_list.getElementsByTagName(GSXML.SERVICE_CLASS_ELEM);
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366 | if (service_racks.getLength()==0) {
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367 | logger.info("... none to be loaded");
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368 | return true;
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369 | }
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370 |
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371 | Element service_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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372 | Element service_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, "", "", "");
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373 | service_message.appendChild(service_request);
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374 |
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375 | for(int i=0; i<service_racks.getLength(); i++) {
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376 | Element n = (Element)service_racks.item(i);
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377 | String service_name = n.getAttribute(GSXML.NAME_ATT);
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378 | logger.info("..."+service_name);
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379 |
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380 | Class service_class = null;
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381 | try {
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382 | service_class = Class.forName("org.greenstone.gsdl3.service."+service_name);
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383 | } catch(ClassNotFoundException e) {
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384 |
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385 | try {
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386 | //try the service_name alone in case the package name is already specified
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387 | service_class = Class.forName(service_name);
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388 |
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389 | }catch(ClassNotFoundException ae) {
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390 | logger.info(ae.getMessage());
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391 | }
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392 | }
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393 | try {
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394 |
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395 | //ServiceRack s = (ServiceRack)Class.forName("org.greenstone.gsdl3.service."+service_name).newInstance();
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396 | ServiceRack s = (ServiceRack)service_class.newInstance();
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397 | s.setSiteHome(this.site_home);
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398 | s.setSiteAddress(this.site_http_address);
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399 | s.setLibraryName(this.library_name);
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400 | s.setMessageRouter(this);
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401 | // pass the XML node to the service for service configuration
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402 | s.configure(n, null);
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403 |
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404 | // find out the supported services for this service module
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405 | Element service_response = (Element) s.process(service_message);
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406 | NodeList services = service_response.getElementsByTagName(GSXML.SERVICE_ELEM);
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407 | if (services.getLength()==0) {
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408 | logger.error("MessageRouter configure error: serviceRack "+service_name+" has no services!");
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409 | } else {
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410 | for (int j=0; j<services.getLength();j++) {
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411 | String service = ((Element)services.item(j)).getAttribute(GSXML.NAME_ATT);
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412 | this.module_map.put(service, s);
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413 |
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414 | // add short info to service_list_ XML
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415 | this.service_list.appendChild(this.doc.importNode(services.item(j), true));
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416 | }
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417 | }
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418 | } catch (Exception e ) {
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419 | logger.error("MessageRouter configure exception: in ServiceRack class specification: "+ e.getMessage());
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420 | e.printStackTrace();
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421 | }
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422 | } // for each service module
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423 | return true;
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424 | }
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425 |
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426 | protected boolean configureClusters(Element config_cluster_list) {
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427 |
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428 | this.cluster_list = this.doc.createElement(GSXML.CLUSTER_ELEM+GSXML.LIST_MODIFIER);
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429 | // load up the service clusters
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430 | logger.info("loading service clusters ...");
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431 | if (config_cluster_list == null) {
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432 | logger.info("... none to be loaded");
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433 | return true;
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434 | }
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435 | NodeList service_clusters = config_cluster_list.getElementsByTagName(GSXML.CLUSTER_ELEM);
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436 | if (service_clusters.getLength()==0) {
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437 | logger.info("... none to be loaded");
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438 | return true;
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439 | }
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440 |
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441 | for (int i=0; i<service_clusters.getLength(); i++) {
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442 | Element cluster = (Element)service_clusters.item(i);
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443 | String name = cluster.getAttribute(GSXML.NAME_ATT);
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444 | logger.info("..."+name);
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445 | ServiceCluster sc = new ServiceCluster();
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446 | sc.setSiteHome(this.site_home);
|
---|
447 | sc.setSiteAddress(this.site_http_address);
|
---|
448 | sc.setClusterName(name);
|
---|
449 | sc.setMessageRouter(this);
|
---|
450 | sc.configure(cluster);
|
---|
451 | this.module_map.put(name, sc); // this replaces the old one if there was one already present
|
---|
452 | //add short info to cluster list
|
---|
453 | Element e = this.doc.createElement(GSXML.CLUSTER_ELEM);
|
---|
454 | e.setAttribute(GSXML.NAME_ATT, name);
|
---|
455 | this.cluster_list.appendChild(e);
|
---|
456 |
|
---|
457 | }
|
---|
458 | return true;
|
---|
459 | }
|
---|
460 |
|
---|
461 | protected boolean configureCollections() {
|
---|
462 |
|
---|
463 | this.collection_list = this.doc.createElement(GSXML.COLLECTION_ELEM+GSXML.LIST_MODIFIER);
|
---|
464 | this.oai_collection_list = this.doc.createElement(GSXML.COLLECTION_ELEM+GSXML.LIST_MODIFIER);
|
---|
465 |
|
---|
466 | // read thru the collect directory and activate all the valid collections
|
---|
467 | File collectDir = new File(GSFile.collectDir(this.site_home));
|
---|
468 | if (collectDir.exists()) {
|
---|
469 | logger.info("Reading thru directory "+collectDir.getPath()+" to find collections.");
|
---|
470 | File[] contents = collectDir.listFiles();
|
---|
471 | for (int i=0; i<contents.length;i++) {
|
---|
472 | if(contents[i].isDirectory()) {
|
---|
473 |
|
---|
474 | String colName = contents[i].getName();
|
---|
475 | if (!colName.startsWith("CVS") && !colName.startsWith(".svn")) {
|
---|
476 | activateCollectionByName(colName);
|
---|
477 | }
|
---|
478 | }
|
---|
479 | }
|
---|
480 | } // collectDir
|
---|
481 | return true;
|
---|
482 | }
|
---|
483 |
|
---|
484 | protected boolean configureSites(Element config_site_list) {
|
---|
485 |
|
---|
486 | this.site_list = this.doc.createElement(GSXML.SITE_ELEM+GSXML.LIST_MODIFIER);
|
---|
487 | // load up the sites
|
---|
488 | logger.info("loading external sites...");
|
---|
489 | if (config_site_list ==null ) {
|
---|
490 | logger.info("...none found");
|
---|
491 | return true;
|
---|
492 | }
|
---|
493 |
|
---|
494 | NodeList sites = config_site_list.getElementsByTagName(GSXML.SITE_ELEM);
|
---|
495 | if (sites.getLength()==0) {
|
---|
496 | logger.info("...none found");
|
---|
497 | return true;
|
---|
498 | }
|
---|
499 |
|
---|
500 | // this is a name to identify the current site in the Communicator
|
---|
501 | String local_site_name = config_site_list.getAttribute(GSXML.LOCAL_SITE_NAME_ATT);
|
---|
502 | if (local_site_name.equals("")) {
|
---|
503 | local_site_name = site_name;
|
---|
504 | }
|
---|
505 |
|
---|
506 | for (int i=0; i<sites.getLength(); i++) {
|
---|
507 | Element s = (Element)sites.item(i);
|
---|
508 | activateSite(s, local_site_name);
|
---|
509 | }
|
---|
510 | return true;
|
---|
511 | }
|
---|
512 |
|
---|
513 | protected boolean activateSite(Element site_elem, String local_site_name) {
|
---|
514 | Communicator comm=null;
|
---|
515 | String type = site_elem.getAttribute(GSXML.TYPE_ATT);
|
---|
516 | String name = site_elem.getAttribute(GSXML.NAME_ATT);
|
---|
517 | if (type.equals(GSXML.COMM_TYPE_SOAP_JAVA)) {
|
---|
518 | comm = new SOAPCommunicator();
|
---|
519 | if (comm.configure(site_elem)) {
|
---|
520 | comm.setLocalSiteName(local_site_name);
|
---|
521 |
|
---|
522 | // add to map of modules
|
---|
523 | this.module_map.put(name, comm);
|
---|
524 | this.site_list.appendChild(this.doc.importNode(site_elem, true));
|
---|
525 | // need to get collection list and service
|
---|
526 | // list from here- if the site isn't up yet, the site will
|
---|
527 | // have to be added later
|
---|
528 | if (!getRemoteSiteInfo(comm, name)) {
|
---|
529 | logger.error(" couldn't get info from site "+name);
|
---|
530 | }
|
---|
531 | } else {
|
---|
532 | logger.error(" couldn't configure soap site:"+name);
|
---|
533 | return false;
|
---|
534 | }
|
---|
535 |
|
---|
536 | } else {
|
---|
537 | System.err.print(" cant talk to server of type:"+type + ", so not making a connection to "+name);
|
---|
538 | return false;
|
---|
539 | }
|
---|
540 | return true;
|
---|
541 | }
|
---|
542 |
|
---|
543 | /** get site info from external site
|
---|
544 | *
|
---|
545 | * @param comm - the communicator object for the external site
|
---|
546 | * @param site_name - the name of the external site
|
---|
547 | * @return true if successful
|
---|
548 | */
|
---|
549 | protected boolean getRemoteSiteInfo(Communicator comm, String site_name) {
|
---|
550 |
|
---|
551 | logger.info(" getting info from site:"+site_name);
|
---|
552 |
|
---|
553 | Element info_request = this.doc.createElement(GSXML.MESSAGE_ELEM);
|
---|
554 | Element req = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, "", "", "");
|
---|
555 | info_request.appendChild(req);
|
---|
556 |
|
---|
557 | // process the message
|
---|
558 | Element info_response = comm.process(info_request);
|
---|
559 | if (info_response == null) {
|
---|
560 | return false;
|
---|
561 | }
|
---|
562 | // collection info
|
---|
563 | NodeList colls = info_response.getElementsByTagName(GSXML.COLLECTION_ELEM);
|
---|
564 | if (colls.getLength()>0) {
|
---|
565 | for (int i=0; i<colls.getLength(); i++) {
|
---|
566 | Element e = (Element)colls.item(i);
|
---|
567 | String col_name = e.getAttribute(GSXML.NAME_ATT);
|
---|
568 | // add the info to own coll list - may want to keep
|
---|
569 | // this separate in future - so can distinguish own and
|
---|
570 | // other collections ??
|
---|
571 | e.setAttribute(GSXML.NAME_ATT, GSPath.prependLink(col_name, site_name));
|
---|
572 | this.collection_list.appendChild(this.doc.importNode(e, true));
|
---|
573 | }
|
---|
574 | }
|
---|
575 |
|
---|
576 | // service info
|
---|
577 | NodeList services = info_response.getElementsByTagName(GSXML.SERVICE_ELEM);
|
---|
578 | if (services.getLength()>0) {
|
---|
579 | for (int i=0; i<services.getLength(); i++) {
|
---|
580 | Element e = (Element)services.item(i);
|
---|
581 | String serv_name = e.getAttribute(GSXML.NAME_ATT);
|
---|
582 | e.setAttribute(GSXML.NAME_ATT, GSPath.prependLink(serv_name, site_name));
|
---|
583 | this.service_list.appendChild(this.doc.importNode(e, true));
|
---|
584 | }
|
---|
585 | }
|
---|
586 |
|
---|
587 | // serviceCluster info
|
---|
588 | NodeList clusters = info_response.getElementsByTagName(GSXML.CLUSTER_ELEM);
|
---|
589 | if (clusters.getLength()>0) {
|
---|
590 | for (int i=0; i<clusters.getLength(); i++) {
|
---|
591 | Element e = (Element)clusters.item(i);
|
---|
592 | String clus_name = e.getAttribute(GSXML.NAME_ATT);
|
---|
593 | e.setAttribute(GSXML.NAME_ATT, GSPath.prependLink(clus_name, site_name));
|
---|
594 | this.cluster_list.appendChild(this.doc.importNode(e, true));
|
---|
595 | }
|
---|
596 | }
|
---|
597 | return true;
|
---|
598 | }
|
---|
599 |
|
---|
600 |
|
---|
601 | //*****************************************************************
|
---|
602 | // auxiliary process methods
|
---|
603 | //*****************************************************************
|
---|
604 |
|
---|
605 | /** handles requests made to the MessageRouter itself
|
---|
606 | *
|
---|
607 | * @param req - the request Element- <request>
|
---|
608 | * @return the result Element - should be <response>
|
---|
609 | */
|
---|
610 | protected Element processMessage(Element req) {
|
---|
611 |
|
---|
612 | // message for self, should be type=describe/configure at this stage
|
---|
613 | String type = req.getAttribute(GSXML.TYPE_ATT);
|
---|
614 | Element response = this.doc.createElement(GSXML.RESPONSE_ELEM);
|
---|
615 | response.setAttribute(GSXML.FROM_ATT, "");
|
---|
616 | if (type.equals(GSXML.REQUEST_TYPE_DESCRIBE)) {
|
---|
617 | response.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_DESCRIBE);
|
---|
618 | // check the param list
|
---|
619 | Element param_list = (Element) GSXML.getChildByTagName(req, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
|
---|
620 | if (param_list == null) {
|
---|
621 | response.appendChild(this.collection_list);
|
---|
622 | response.appendChild(this.cluster_list);
|
---|
623 | response.appendChild(this.site_list);
|
---|
624 | response.appendChild(this.service_list);
|
---|
625 | return response;
|
---|
626 | }
|
---|
627 | NodeList params = param_list.getElementsByTagName(GSXML.PARAM_ELEM);
|
---|
628 |
|
---|
629 | // go through the param list and see what components are wanted
|
---|
630 | for (int i=0; i<params.getLength(); i++) {
|
---|
631 |
|
---|
632 | Element param = (Element)params.item(i);
|
---|
633 | // Identify the structure information desired
|
---|
634 | if (param.getAttribute(GSXML.NAME_ATT).equals(GSXML.SUBSET_PARAM)) {
|
---|
635 | String info = param.getAttribute(GSXML.VALUE_ATT);
|
---|
636 | if (info.equals(GSXML.COLLECTION_ELEM+GSXML.LIST_MODIFIER)) {
|
---|
637 | response.appendChild(this.collection_list);
|
---|
638 |
|
---|
639 | } else if (info.equals(GSXML.CLUSTER_ELEM+GSXML.LIST_MODIFIER)) {
|
---|
640 | response.appendChild(this.cluster_list);
|
---|
641 |
|
---|
642 | } else if (info.equals(GSXML.SERVICE_ELEM+GSXML.LIST_MODIFIER)) {
|
---|
643 | response.appendChild(this.service_list);
|
---|
644 | } else if (info.equals(GSXML.SITE_ELEM+GSXML.LIST_MODIFIER)) {
|
---|
645 | response.appendChild(this.site_list);
|
---|
646 | }
|
---|
647 | }
|
---|
648 | }
|
---|
649 | return response;
|
---|
650 |
|
---|
651 | }
|
---|
652 |
|
---|
653 | if (type.equals(GSXML.REQUEST_TYPE_SYSTEM)) {
|
---|
654 |
|
---|
655 | // a list of system requests - should put any error messages
|
---|
656 | // or success messages into response
|
---|
657 | NodeList commands = req.getElementsByTagName(GSXML.SYSTEM_ELEM);
|
---|
658 | Element site_config_elem = null;
|
---|
659 | boolean success = false;
|
---|
660 |
|
---|
661 | for (int i=0; i<commands.getLength(); i++) {
|
---|
662 | // all the commands should be Elements
|
---|
663 | Element elem = (Element)commands.item(i);
|
---|
664 | String action = elem.getAttribute(GSXML.TYPE_ATT);
|
---|
665 | if (action.equals(GSXML.SYSTEM_TYPE_CONFIGURE)) {
|
---|
666 | String subset = elem.getAttribute(GSXML.SYSTEM_SUBSET_ATT);
|
---|
667 | if (subset.equals("")) {
|
---|
668 | // need to reconfigure the MR
|
---|
669 | this.configure();
|
---|
670 | Element s = GSXML.createTextElement(this.doc, GSXML.STATUS_ELEM, "MessageRouter reconfigured successfully");
|
---|
671 | response.appendChild(s);
|
---|
672 |
|
---|
673 | } else {
|
---|
674 | // else it a specific request
|
---|
675 | if (subset.equals(GSXML.COLLECTION_ELEM+GSXML.LIST_MODIFIER)) {
|
---|
676 | success = configureCollections();
|
---|
677 | } else {
|
---|
678 |
|
---|
679 | // need the site config file
|
---|
680 | if (site_config_elem==null) {
|
---|
681 |
|
---|
682 | File configFile = new File(GSFile.siteConfigFile(this.site_home));
|
---|
683 | if (!configFile.exists() ) {
|
---|
684 | logger.error(" site config file: "+configFile.getPath()+" not found!");
|
---|
685 | continue;
|
---|
686 | }
|
---|
687 | Document site_config_doc = this.converter.getDOM(configFile);
|
---|
688 | if (site_config_doc == null) {
|
---|
689 | logger.error(" couldn't parse site config file: "+configFile.getPath());
|
---|
690 | continue;
|
---|
691 | }
|
---|
692 | site_config_elem = site_config_doc.getDocumentElement();
|
---|
693 | }
|
---|
694 | if (subset.equals(GSXML.SERVICE_ELEM+GSXML.LIST_MODIFIER)) {
|
---|
695 | Element service_rack_list = (Element)GSXML.getChildByTagName(site_config_elem, GSXML.SERVICE_CLASS_ELEM+GSXML.LIST_MODIFIER);
|
---|
696 |
|
---|
697 | success = configureServices(service_rack_list);
|
---|
698 | } else if (subset.equals(GSXML.CLUSTER_ELEM+GSXML.LIST_MODIFIER)) {
|
---|
699 | Element cluster_list = (Element)GSXML.getChildByTagName(site_config_elem, GSXML.CLUSTER_ELEM+GSXML.LIST_MODIFIER);
|
---|
700 |
|
---|
701 | success = configureClusters(cluster_list);
|
---|
702 | } else if (subset.equals(GSXML.SITE_ELEM+GSXML.LIST_MODIFIER)) {
|
---|
703 | Element site_list = (Element)GSXML.getChildByTagName(site_config_elem, GSXML.SITE_ELEM+GSXML.LIST_MODIFIER);
|
---|
704 | success = configureSites(site_list);
|
---|
705 | }
|
---|
706 | }
|
---|
707 | String message=null;
|
---|
708 | if (success) {
|
---|
709 | message = subset + "reconfigured successfully";
|
---|
710 | } else {
|
---|
711 | message = "Error in reconfiguring "+subset;
|
---|
712 | }
|
---|
713 | Element s = GSXML.createTextElement(this.doc, GSXML.STATUS_ELEM, message);
|
---|
714 | response.appendChild(s);
|
---|
715 | }
|
---|
716 |
|
---|
717 |
|
---|
718 | } else {
|
---|
719 | String module_name = elem.getAttribute(GSXML.SYSTEM_MODULE_NAME_ATT);
|
---|
720 | String module_type = elem.getAttribute(GSXML.SYSTEM_MODULE_TYPE_ATT);
|
---|
721 |
|
---|
722 | if (action.equals(GSXML.SYSTEM_TYPE_DEACTIVATE)) {
|
---|
723 | deactivateModule(module_type, module_name);
|
---|
724 | Element s = GSXML.createTextElement(this.doc, GSXML.STATUS_ELEM, module_type+": "+module_name+" deactivated");
|
---|
725 | response.appendChild(s);
|
---|
726 | } else if (action.equals(GSXML.SYSTEM_TYPE_ACTIVATE)) {
|
---|
727 | if (module_type.equals(GSXML.COLLECTION_ELEM)) {
|
---|
728 | success = activateCollectionByName(module_name);
|
---|
729 | } else if (module_type.equals(GSXML.SITE_ELEM)) {
|
---|
730 | success = activateSiteByName(module_name);
|
---|
731 | } else if (module_type.equals(GSXML.CLUSTER_ELEM)) {
|
---|
732 | success = activateServiceClusterByName(module_name);
|
---|
733 | }
|
---|
734 | if (success) {
|
---|
735 | Element s = GSXML.createTextElement(this.doc, GSXML.STATUS_ELEM, module_type+": "+module_name+" activated");
|
---|
736 | response.appendChild(s);
|
---|
737 | } else {
|
---|
738 | Element s = GSXML.createTextElement(this.doc, GSXML.STATUS_ELEM, module_type+": "+module_name+" could not be activated");
|
---|
739 | response.appendChild(s);
|
---|
740 | }
|
---|
741 | }
|
---|
742 | } // else not a configure action
|
---|
743 | } // for all commands
|
---|
744 | return response;
|
---|
745 |
|
---|
746 |
|
---|
747 | } // system type request
|
---|
748 |
|
---|
749 | // if get here something has gone wrong
|
---|
750 | logger.error(" cant process request:");
|
---|
751 | logger.error(this.converter.getString(req));
|
---|
752 | return null;
|
---|
753 |
|
---|
754 | }
|
---|
755 | protected Element modifyMessages(Element request, Element message, Element result) {
|
---|
756 | Element response = this.doc.createElement(GSXML.RESPONSE_ELEM);
|
---|
757 | response.setAttribute(GSXML.FROM_ATT, "");
|
---|
758 | response.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_MESSAGING);
|
---|
759 |
|
---|
760 | NodeList commands = request.getElementsByTagName("command");
|
---|
761 | if (commands == null) {
|
---|
762 | logger.error("no commands, "+converter.getPrettyString(request));
|
---|
763 | return response;
|
---|
764 | }
|
---|
765 | for (int i=0; i<commands.getLength(); i++) {
|
---|
766 | Element action = (Element)commands.item(i);
|
---|
767 | String type = action.getAttribute(GSXML.TYPE_ATT);
|
---|
768 | if (type.equals("copyNode")) {
|
---|
769 | // copies the from node as a child of to node
|
---|
770 | String from_path = action.getAttribute("from");
|
---|
771 | String to_path = action.getAttribute("to");
|
---|
772 | Element from_node = null;
|
---|
773 | String from_node_root = GSPath.getFirstLink(from_path);
|
---|
774 | if (from_node_root.startsWith(GSXML.REQUEST_ELEM)) {
|
---|
775 | from_node = message;
|
---|
776 | } else if (from_node_root.startsWith(GSXML.RESPONSE_ELEM)) {
|
---|
777 | from_node = result;
|
---|
778 | }
|
---|
779 | if (from_node == null) {
|
---|
780 | continue;
|
---|
781 | }
|
---|
782 | Element to_node = null;
|
---|
783 | String to_node_root = GSPath.getFirstLink(to_path);
|
---|
784 | if (to_node_root.startsWith(GSXML.REQUEST_ELEM)) {
|
---|
785 | to_node = message;
|
---|
786 | } else if (to_node_root.startsWith(GSXML.RESPONSE_ELEM)) {
|
---|
787 | to_node = result;
|
---|
788 | }
|
---|
789 | if (to_node == null) {
|
---|
790 | continue;
|
---|
791 | }
|
---|
792 | // now we know what node to copy where
|
---|
793 | Node orig_node = GSXML.getNodeByPathIndexed(from_node, from_path);
|
---|
794 | if (orig_node == null) {
|
---|
795 | continue;
|
---|
796 | }
|
---|
797 | Node new_parent = GSXML.getNodeByPathIndexed(to_node, to_path);
|
---|
798 | if (new_parent == null) {
|
---|
799 | continue;
|
---|
800 |
|
---|
801 | }
|
---|
802 | new_parent.appendChild(to_node.getOwnerDocument().importNode(orig_node, true));
|
---|
803 | }
|
---|
804 |
|
---|
805 | else if (type.equals("copyChildren")) {
|
---|
806 |
|
---|
807 | }
|
---|
808 | } // for each command
|
---|
809 | return response;
|
---|
810 | }
|
---|
811 |
|
---|
812 | // ****************************************************
|
---|
813 | // other methods
|
---|
814 | // ****************************************************
|
---|
815 |
|
---|
816 | /** creates and configures a new collection
|
---|
817 | *
|
---|
818 | *@param col_name the name of the collection
|
---|
819 | *@return true if collection created ok
|
---|
820 | */
|
---|
821 | protected boolean activateCollectionByName(String col_name) {
|
---|
822 |
|
---|
823 | logger.info("Activating collection: "+col_name+".");
|
---|
824 |
|
---|
825 | // Look for the etc/collectionInit.xml file, and see what sort of Collection to load
|
---|
826 | Collection c = null;
|
---|
827 | File init_file = new File(GSFile.collectionInitFile(this.site_home, col_name));
|
---|
828 |
|
---|
829 | if (init_file.exists()) {
|
---|
830 | Document init_doc = this.converter.getDOM(init_file);
|
---|
831 | if (init_doc != null) {
|
---|
832 | Element init_elem = init_doc.getDocumentElement();
|
---|
833 | if (init_elem != null) {
|
---|
834 | String coll_class_name = init_elem.getAttribute("class");
|
---|
835 | if (!coll_class_name.equals("")) {
|
---|
836 | try {
|
---|
837 | c = (Collection)Class.forName("org.greenstone.gsdl3.collection."+coll_class_name).newInstance();
|
---|
838 | } catch (Exception e) {
|
---|
839 | logger.info(" couldn't create a new collection, type "+coll_class_name+", defaulting to class Collection");
|
---|
840 | }
|
---|
841 | }
|
---|
842 | }
|
---|
843 | }
|
---|
844 | }
|
---|
845 | if (c==null) { // we haven't found another classname to use
|
---|
846 | c = new Collection();
|
---|
847 | }
|
---|
848 |
|
---|
849 | c.setCollectionName(col_name);
|
---|
850 | c.setSiteHome(this.site_home);
|
---|
851 | c.setSiteAddress(this.site_http_address);
|
---|
852 | c.setMessageRouter(this);
|
---|
853 | if (c.configure()) {
|
---|
854 | // this could be a reactivation, so delete the old version
|
---|
855 | deactivateModule(GSXML.COLLECTION_ELEM, col_name);
|
---|
856 | // add to list of collections
|
---|
857 | this.module_map.put(col_name, c);
|
---|
858 |
|
---|
859 | if(c.isPublic()) {
|
---|
860 | // only public collections will appear on the home page
|
---|
861 | // add short description_ to collection_list_
|
---|
862 | Element e = this.doc.createElement(GSXML.COLLECTION_ELEM);
|
---|
863 | e.setAttribute(GSXML.NAME_ATT, col_name);
|
---|
864 | // if (c.hasOAI()) {
|
---|
865 | // e.setAttribute(OAIXML.HAS_OAI, "true");
|
---|
866 | // } else {
|
---|
867 | // e.setAttribute(OAIXML.HAS_OAI, "false");
|
---|
868 | // }
|
---|
869 | if (c.hasOAI() == true) {
|
---|
870 | Element ane = this.doc.createElement(GSXML.COLLECTION_ELEM);
|
---|
871 | //The collection name is returned as site_name:coll_name, which is in fact the set specification
|
---|
872 | ane.setAttribute(GSXML.NAME_ATT, site_name + ":" + col_name);
|
---|
873 | ane.setAttribute(OAIXML.LASTMODIFIED, "" + c.getLastmodified());
|
---|
874 |
|
---|
875 | this.oai_collection_list.appendChild(ane);
|
---|
876 | //logger.info(GSXML.xmlNodeToString(oai_collection_list));
|
---|
877 | }
|
---|
878 | this.collection_list.appendChild(e);
|
---|
879 | }
|
---|
880 | return true;
|
---|
881 | } else {
|
---|
882 | logger.error("Couldn't configure collection: "+
|
---|
883 | col_name+".");
|
---|
884 | return false;
|
---|
885 | }
|
---|
886 | }
|
---|
887 | protected Element getCollectionList() {
|
---|
888 | return collection_list;
|
---|
889 | }
|
---|
890 |
|
---|
891 |
|
---|
892 | protected boolean activateSiteByName(String site_name) {
|
---|
893 | logger.info("Activating site: "+site_name+".");
|
---|
894 |
|
---|
895 | // just in case this is a reactivation, deactivate this site first
|
---|
896 | deactivateModule(GSXML.SITE_ELEM, site_name);
|
---|
897 | File configFile = new File(GSFile.siteConfigFile(this.site_home));
|
---|
898 |
|
---|
899 | if (!configFile.exists() ) {
|
---|
900 | logger.error(" site config file: "+configFile.getPath()+" not found!");
|
---|
901 | return false;
|
---|
902 | }
|
---|
903 | Document config_doc = this.converter.getDOM(configFile);
|
---|
904 | if (config_doc == null) {
|
---|
905 | logger.error(" couldn't parse site config file: "+configFile.getPath());
|
---|
906 | return false;
|
---|
907 | }
|
---|
908 | Element config_elem = config_doc.getDocumentElement();
|
---|
909 |
|
---|
910 | Element config_site_list = (Element)GSXML.getChildByTagName(config_elem, GSXML.SITE_ELEM+GSXML.LIST_MODIFIER);
|
---|
911 | if (config_site_list ==null ) {
|
---|
912 | logger.error("activateSite, no sites found");
|
---|
913 | return false;
|
---|
914 | }
|
---|
915 | // this is a name to identify the current site in the Communicator
|
---|
916 | String local_site_name = config_site_list.getAttribute("localSiteName");
|
---|
917 | if (local_site_name.equals("")) {
|
---|
918 | local_site_name = site_name;
|
---|
919 | }
|
---|
920 |
|
---|
921 | Element this_site_elem = GSXML.getNamedElement(config_site_list, GSXML.SITE_ELEM, GSXML.NAME_ATT, site_name);
|
---|
922 | if (this_site_elem == null) {
|
---|
923 | logger.error("activateSite, site "+site_name+" not found");
|
---|
924 | return false;
|
---|
925 | }
|
---|
926 |
|
---|
927 | return activateSite(this_site_elem, local_site_name);
|
---|
928 | }
|
---|
929 |
|
---|
930 | protected boolean activateServiceClusterByName(String cluster_name) {
|
---|
931 | return false;
|
---|
932 |
|
---|
933 | }
|
---|
934 |
|
---|
935 | protected boolean activateServiceRackByName(String module_name) {
|
---|
936 | return false;
|
---|
937 | }
|
---|
938 |
|
---|
939 | protected boolean deactivateModule(String type, String name) {
|
---|
940 |
|
---|
941 | if (this.module_map.containsKey(name)) {
|
---|
942 |
|
---|
943 | logger.info(" deactivating "+name);
|
---|
944 | ModuleInterface m = (ModuleInterface)this.module_map.remove(name);
|
---|
945 | m.cleanUp(); // clean up any open files/connections etc - can cause trouble on windows
|
---|
946 | // also remove the xml bit from description list
|
---|
947 | if (type.equals(GSXML.COLLECTION_ELEM)) {
|
---|
948 | Element this_col = GSXML.getNamedElement(this.collection_list, GSXML.COLLECTION_ELEM, GSXML.NAME_ATT, name);
|
---|
949 | if (this_col != null) {
|
---|
950 | this.collection_list.removeChild(this_col);
|
---|
951 | }
|
---|
952 | return true;
|
---|
953 | } else if (type.equals(GSXML.SERVICE_ELEM)) {
|
---|
954 | Element this_service = GSXML.getNamedElement(this.service_list, GSXML.SERVICE_ELEM, GSXML.NAME_ATT, name);
|
---|
955 | if (this_service != null) {
|
---|
956 | this.service_list.removeChild(this_service);
|
---|
957 | }
|
---|
958 | return true;
|
---|
959 | } else if (type.equals(GSXML.CLUSTER_ELEM)) {
|
---|
960 | Element this_cluster = GSXML.getNamedElement(this.cluster_list, GSXML.CLUSTER_ELEM, GSXML.NAME_ATT, name);
|
---|
961 | if (this_cluster != null) {
|
---|
962 | this.cluster_list.removeChild(this_cluster);
|
---|
963 | }
|
---|
964 | return true;
|
---|
965 | } else if (type.equals(GSXML.SITE_ELEM)) {
|
---|
966 | Element this_site = GSXML.getNamedElement(this.site_list, GSXML.SITE_ELEM, GSXML.NAME_ATT, name);
|
---|
967 | if (this_site != null) {
|
---|
968 | this.site_list.removeChild(this_site);
|
---|
969 |
|
---|
970 | // also remove this sites colls, services, clusters etc
|
---|
971 | removeRemoteSiteInfo(this.collection_list, GSXML.COLLECTION_ELEM, name);
|
---|
972 | removeRemoteSiteInfo(this.cluster_list, GSXML.CLUSTER_ELEM, name);
|
---|
973 | removeRemoteSiteInfo(this.service_list, GSXML.SERVICE_ELEM, name);
|
---|
974 | }
|
---|
975 | } else {
|
---|
976 | logger.error(" couldn't deactivate coll");
|
---|
977 | // couldn't do it
|
---|
978 | return false;
|
---|
979 | }
|
---|
980 | }
|
---|
981 | // else not deactivated
|
---|
982 | return false;
|
---|
983 |
|
---|
984 | }
|
---|
985 |
|
---|
986 | /**
|
---|
987 | * this looks through a list (module_list) of elements named module_name,
|
---|
988 | * and removes any whose names start with site_name
|
---|
989 | */
|
---|
990 | protected void removeRemoteSiteInfo(Element module_list,
|
---|
991 | String module_name,
|
---|
992 | String site_name) {
|
---|
993 |
|
---|
994 | NodeList modules = module_list.getElementsByTagName(module_name);
|
---|
995 | // will this work??
|
---|
996 | for (int i=modules.getLength()-1; i>=0; i--) {
|
---|
997 |
|
---|
998 | String name = ((Element)modules.item(i)).getAttribute(GSXML.NAME_ATT);
|
---|
999 | if (GSPath.getFirstLink(name).equals(site_name)) {
|
---|
1000 | module_list.removeChild(modules.item(i));
|
---|
1001 | }
|
---|
1002 | }
|
---|
1003 | }
|
---|
1004 |
|
---|
1005 | }
|
---|
1006 |
|
---|
1007 |
|
---|