[13592] | 1 | /**
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| 2 | *############################################################################
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| 3 | * A component of the Greenstone Librarian Interface, part of the Greenstone
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| 4 | * digital library suite from the New Zealand Digital Library Project at the
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| 5 | * University of Waikato, New Zealand.
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| 6 | *
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| 7 | * Author: Michael Dewsnip, NZDL Project, University of Waikato, NZ
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| 8 | *
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| 9 | * Copyright (C) 2004 New Zealand Digital Library Project
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| 10 | *
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| 11 | * This program is free software; you can redistribute it and/or modify
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| 12 | * it under the terms of the GNU General Public License as published by
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| 13 | * the Free Software Foundation; either version 2 of the License, or
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| 14 | * (at your option) any later version.
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| 15 | *
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| 16 | * This program is distributed in the hope that it will be useful,
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| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | * GNU General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with this program; if not, write to the Free Software
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| 23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 24 | *############################################################################
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| 25 | */
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| 26 |
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| 27 | package org.greenstone.gatherer.greenstone;
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| 28 |
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| 29 |
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| 30 | import java.io.*;
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| 31 | import java.lang.*;
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| 32 | import java.net.*;
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| 33 | import javax.swing.*;
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| 34 | import org.greenstone.gatherer.Configuration;
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| 35 | import org.greenstone.gatherer.DebugStream;
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| 36 | import org.greenstone.gatherer.Dictionary;
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| 37 | import org.greenstone.gatherer.Gatherer;
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| 38 |
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| 39 |
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| 40 | public class LocalLibraryServer
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| 41 | {
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| 42 | static final private String ADD_COMMAND = "?a=config&cmd=add-collection&c=";
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| 43 | static final private String RELEASE_COMMAND = "?a=config&cmd=release-collection&c=";
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| 44 | static final private String QUIT_COMMAND = "?a=config&cmd=kill";
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| 45 |
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| 46 | static private GSDLSiteConfig gsdlsite_cfg_file = null;
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| 47 | static private File local_library_server_file = null;
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| 48 |
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| 49 | static private boolean running = false;
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| 50 |
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| 51 | static public void addCollection(String collection_name)
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| 52 | {
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| 53 | config(ADD_COMMAND + collection_name);
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| 54 | // This is very important -- it ensures that the above command has finished
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| 55 | config("");
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| 56 | }
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| 57 |
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| 58 |
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| 59 | // Used to send messages to the local library
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| 60 | // Warning: this has a lot of potential for nasty race conditions
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| 61 | // The response code is returned immediately -- but this does not mean the local
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| 62 | // library action has finished!
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| 63 | static private void config(String command)
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| 64 | {
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| 65 | if (Configuration.library_url == null) {
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| 66 | System.err.println("Error: Trying to configure local library with null Configuration.library_url!");
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| 67 | return;
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| 68 | }
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| 69 |
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| 70 | try {
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| 71 | URL url = new URL(Configuration.library_url.toString() + command);
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| 72 | HttpURLConnection library_connection = (HttpURLConnection) url.openConnection();
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| 73 | int response_code = library_connection.getResponseCode();
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| 74 | if (response_code >= HttpURLConnection.HTTP_OK && response_code < HttpURLConnection.HTTP_MULT_CHOICE) {
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| 75 | DebugStream.println("200 - Complete.");
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| 76 | }
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| 77 | else {
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| 78 | DebugStream.println("404 - Failed.");
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| 79 | }
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| 80 | }
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| 81 | catch (Exception ex) {
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| 82 | DebugStream.printStackTrace(ex);
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| 83 | }
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| 84 | }
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| 85 |
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| 86 |
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| 87 | static public boolean isRunning()
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| 88 | {
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| 89 | if (!running) return false;
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| 90 | gsdlsite_cfg_file.load();
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| 91 | if (gsdlsite_cfg_file.getURL() == null) return false;
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| 92 | return true;
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| 93 | }
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| 94 |
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| 95 | static public void releaseCollection(String collection_name)
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| 96 | {
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| 97 | config(RELEASE_COMMAND + collection_name);
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| 98 | // This is very important -- it ensures that the above command has finished
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| 99 | config("");
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| 100 |
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| 101 | // !! HACK: Wait a couple of seconds, in the hope that this will reduce the "could not delete index" errors
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| 102 | new OneSecondWait();
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| 103 | new OneSecondWait();
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| 104 | }
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| 105 |
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| 106 |
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| 107 | static public void start(String gsdl_path, String local_library_server_file_path)
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| 108 | {
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| 109 | // Check the local library server.exe file exists
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| 110 | local_library_server_file = new File(local_library_server_file_path);
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| 111 | if (!local_library_server_file.exists()) {
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| 112 | DebugStream.println("No local library at given file path.");
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| 113 |
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| 114 | local_library_server_file = new File(gsdl_path + "server.exe");
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| 115 | if (!local_library_server_file.exists()) {
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| 116 | DebugStream.println("No local library at all.");
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| 117 | return;
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| 118 | }
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| 119 | }
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| 120 |
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| 121 | // Check if the server is already running
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| 122 | gsdlsite_cfg_file = new GSDLSiteConfig(local_library_server_file);
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| 123 | String url = gsdlsite_cfg_file.getURL();
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| 124 | if (url != null) {
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| 125 | // If it is already running then set the Greenstone web server address and we're done
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| 126 | try {
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| 127 | Configuration.library_url = new URL(url);
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| 128 | running = true;
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| 129 | return;
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| 130 | }
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| 131 | catch (MalformedURLException exception) {
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| 132 | DebugStream.printStackTrace(exception);
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| 133 | }
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| 134 | }
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| 135 |
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| 136 | // Configure the server for immediate entry
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| 137 | gsdlsite_cfg_file.set();
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| 138 |
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| 139 | // Spawn local library server process
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| 140 | String local_library_server_command = local_library_server_file.getAbsolutePath() + " " + gsdlsite_cfg_file.getSiteConfigFilename();
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| 141 | Gatherer.spawnApplication(local_library_server_command);
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| 142 |
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| 143 | // Wait until program has started, by reloading and checking the URL field
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| 144 | gsdlsite_cfg_file.load();
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| 145 | int attempt_count = 0;
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| 146 | while (gsdlsite_cfg_file.getURL() == null) {
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| 147 | new OneSecondWait(); // Wait one second (give or take)
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| 148 | gsdlsite_cfg_file.load();
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| 149 | attempt_count++;
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| 150 |
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| 151 | // After waiting a minute ask the user whether they want to wait another minute
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| 152 | if (attempt_count == 60) {
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| 153 | int try_again = JOptionPane.showConfirmDialog(Gatherer.g_man, Dictionary.get("Server.QuitTimeOut"), Dictionary.get("General.Warning"), JOptionPane.YES_NO_OPTION);
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| 154 | if (try_again == JOptionPane.NO_OPTION) {
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| 155 | return;
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| 156 | }
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| 157 | attempt_count = 0;
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| 158 | }
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| 159 | }
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| 160 |
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| 161 | // Ta-da. Now the url should be available
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| 162 | try {
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| 163 | Configuration.library_url = new URL(gsdlsite_cfg_file.getURL());
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| 164 | }
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| 165 | catch (MalformedURLException exception) {
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| 166 | DebugStream.printStackTrace(exception);
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| 167 | }
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| 168 |
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| 169 | // A quick test involves opening a connection to get the home page for this collection
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| 170 | try {
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| 171 | DebugStream.println("Try connecting to server on config url: '" + Configuration.library_url+ "'");
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| 172 | URLConnection connection = Configuration.library_url.openConnection();
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| 173 | connection.getContent();
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| 174 | }
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| 175 | catch (IOException bad_url_connection) {
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| 176 | try {
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| 177 | // If this fails then we try changing the url to be localhost
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| 178 | Configuration.library_url = new URL(gsdlsite_cfg_file.getLocalHostURL());
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| 179 | DebugStream.println("Try connecting to server on local host: '" + Configuration.library_url + "'");
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| 180 | URLConnection connection = Configuration.library_url.openConnection();
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| 181 | connection.getContent();
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| 182 | }
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| 183 | catch (IOException worse_url_connection) {
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| 184 | DebugStream.println("Can't connect to server on either address.");
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| 185 | Configuration.library_url = null;
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| 186 | return;
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| 187 | }
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| 188 | }
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| 189 |
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| 190 | running = true;
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| 191 | }
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| 192 |
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| 193 |
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| 194 | static public void stop()
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| 195 | {
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| 196 | if (running == false) {
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| 197 | return;
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| 198 | }
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| 199 |
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| 200 | // Send the command for it to exit.
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| 201 | config(QUIT_COMMAND);
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| 202 |
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| 203 | // Wait until program has stopped, by reloading and checking the URL field
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| 204 | gsdlsite_cfg_file.load();
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| 205 | int attempt_count = 0;
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| 206 | while (gsdlsite_cfg_file.getURL() != null) {
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| 207 | new OneSecondWait(); // Wait one second (give or take)
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| 208 | gsdlsite_cfg_file.load();
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| 209 | attempt_count++;
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| 210 |
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| 211 | // After waiting a minute ask the user whether they want to wait another minute
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| 212 | if (attempt_count == 60) {
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| 213 | int try_again = JOptionPane.showConfirmDialog(Gatherer.g_man, Dictionary.get("Server.QuitTimeOut"), Dictionary.get("General.Warning"), JOptionPane.YES_NO_OPTION);
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| 214 | if (try_again == JOptionPane.NO_OPTION) {
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| 215 | return;
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| 216 | }
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| 217 | attempt_count = 0;
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| 218 | }
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| 219 | }
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| 220 |
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| 221 | // Restore the gsdlsite_cfg.
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| 222 | gsdlsite_cfg_file.restore();
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| 223 |
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| 224 | // If the local server is still running then our changed values will get overwritten.
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| 225 | if (gsdlsite_cfg_file.getURL() != null) {
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| 226 | JOptionPane.showMessageDialog(Gatherer.g_man, Dictionary.get("Server.QuitManual"), Dictionary.get("General.Error"), JOptionPane.ERROR_MESSAGE);
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| 227 | }
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| 228 |
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| 229 | running = false;
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| 230 | }
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| 231 |
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| 232 | static public void checkServerRunning() {
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| 233 | if (!running) return; // don't worry about it if its not supposed to be running
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| 234 | gsdlsite_cfg_file.load();
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| 235 | if (gsdlsite_cfg_file.getURL() == null) {
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| 236 | // need to restart the server again
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| 237 | gsdlsite_cfg_file.set();
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| 238 |
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| 239 | // Spawn local library server process
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| 240 | String local_library_server_command = local_library_server_file.getAbsolutePath() + " " + gsdlsite_cfg_file.getSiteConfigFilename();
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| 241 | Gatherer.spawnApplication(local_library_server_command);
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| 242 |
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| 243 | }
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| 244 | }
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| 245 | static private class OneSecondWait
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| 246 | {
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| 247 | public OneSecondWait()
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| 248 | {
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| 249 | synchronized(this) {
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| 250 | try {
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| 251 | wait(1000);
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| 252 | }
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| 253 | catch (InterruptedException exception) {
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| 254 | }
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| 255 | }
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| 256 | }
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| 257 | }
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| 258 | }
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