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11 package org.eclipse.help.internal.base;
12 import java.io.File  ;
13 import java.io.FileOutputStream ;
14 import java.io.IOException ;
15 import java.io.RandomAccessFile ;
16 import java.nio.channels.FileLock ;
17 import java.util.Map ;
18 import java.util.Properties ;
19
20 import org.eclipse.core.runtime.IConfigurationElement;
21 import org.eclipse.core.runtime.IExecutableExtension;
22 import org.eclipse.core.runtime.Platform;
23 import org.eclipse.equinox.app.IApplication;
24 import org.eclipse.equinox.app.IApplicationContext;
25 import org.eclipse.help.internal.server.WebappManager;
26 import org.eclipse.osgi.util.NLS;
27
28
34 public class HelpApplication implements IApplication, IExecutableExtension {
35 private static final String APPLICATION_LOCK_FILE = ".applicationlock"; private static final int STATE_EXITING = 0;
37 private static final int STATE_RUNNING = 1;
38 private static final int STATE_RESTARTING = 2;
39 private static int status = STATE_RUNNING;
40 private File metadata;
41 private FileLock lock;
42
43
46 public synchronized Object start(IApplicationContext context) throws Exception {
47 if (status == STATE_RESTARTING) {
48 return EXIT_RESTART;
49 }
50
51 metadata = new File (Platform.getLocation().toFile(), ".metadata/"); if (!BaseHelpSystem.ensureWebappRunning()) {
53 System.out.println(NLS.bind(HelpBaseResources.HelpApplication_couldNotStart, Platform.getLogFileLocation().toOSString()));
54 return EXIT_OK;
55 }
56
57 if (status == STATE_RESTARTING) {
58 return EXIT_RESTART;
59 }
60
61 writeHostAndPort();
62 obtainLock();
63
64 if (BaseHelpSystem.MODE_STANDALONE == BaseHelpSystem.getMode()) {
65 DisplayUtils.runUI();
67 }
68 while (status == STATE_RUNNING) {
70 try {
71 Thread.sleep(100);
72 } catch (InterruptedException ie) {
73 break;
74 }
75 }
76 releaseLock();
77 if (status == STATE_RESTARTING) {
78 return EXIT_RESTART;
79 }
80 return EXIT_OK;
81 }
82
83
86 public void stop() {
87 stopHelp();
88
89 synchronized(this) {};
91 }
92
93
96 public static void stopHelp() {
97 status = STATE_EXITING;
98 if (BaseHelpSystem.MODE_STANDALONE == BaseHelpSystem.getMode()) {
99 DisplayUtils.wakeupUI();
101 }
102 }
103
104
107 public static void restartHelp() {
108 if (status != STATE_EXITING) {
109 status = STATE_RESTARTING;
110 }
111 }
112
113
116 public void setInitializationData(IConfigurationElement configElement, String propertyName, Object data) {
117 String value = (String )((Map )data).get("mode"); if ("infocenter".equalsIgnoreCase(value)) { BaseHelpSystem.setMode(BaseHelpSystem.MODE_INFOCENTER);
120 }
121 else if ("standalone".equalsIgnoreCase(value)) { BaseHelpSystem.setMode(BaseHelpSystem.MODE_STANDALONE);
123 }
124 }
125
126 private void writeHostAndPort() throws IOException {
127 Properties p = new Properties ();
128 p.put("host", WebappManager.getHost()); p.put("port", "" + WebappManager.getPort());
131 File hostPortFile = new File (metadata, ".connection"); hostPortFile.deleteOnExit();
133 FileOutputStream out = null;
134 try {
135 out = new FileOutputStream (hostPortFile);
136 p.store(out, null);
137 } finally {
138 if (out != null) {
139 try {
140 out.close();
141 } catch (IOException ioe2) {
142 }
143 }
144 }
145
146 }
147
148 private void obtainLock() {
149 File lockFile = new File (metadata, APPLICATION_LOCK_FILE);
150 try {
151 RandomAccessFile raf = new RandomAccessFile (lockFile, "rw"); lock = raf.getChannel().lock();
153 } catch (IOException ioe) {
154 lock = null;
155 }
156 }
157
158 private void releaseLock() {
159 if (lock != null) {
160 try {
161 lock.channel().close();
162 } catch (IOException ioe) {
163 }
164 }
165 }
166
167 public static boolean isRunning() {
168 return status == STATE_RUNNING;
169 }
170 }
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