*) Adding server shutdown hook

... to allow a graceful shutdown even if the java runtime was interrupted using
   <ctrl>+<c>

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@104 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/yacy.java

@@ -263,6 +263,11 @@ public final class yacy {
                         serverSystem.openBrowser("http://localhost:" + port + "/" + browserPopUpPage, browserPopUpApplication);
                     }
                     
+                    // registering shutdown hook
+                    serverLog.logSystem("STARTUP", "Registering Shutdown Hook");
+                    Runtime run = Runtime.getRuntime();
+                    run.addShutdownHook(new shutdownHookThread(Thread.currentThread(), sb));
+                    
                     // wait for server shutdown
                     try {
                         sb.waitForShutdown();
@@ -299,7 +304,9 @@ public final class yacy {
             ee.printStackTrace();
         }
         serverLog.logSystem("SHUTDOWN", "goodbye. (this is the last line)");
-	try {System.exit(0);} catch (Exception e) {} // was once stopped by de.anomic.net.ftpc$sm.checkExit(ftpc.java:1790)
+        try {
+            System.exit(0);
+        } catch (Exception e) {} // was once stopped by de.anomic.net.ftpc$sm.checkExit(ftpc.java:1790)
     }
     
     
@@ -328,7 +335,7 @@ public final class yacy {
         return config;
     }
     
-    private static void shutdown(String homePath) {
+    static void shutdown(String homePath) {
         // start up
         System.out.println(copyright);
         System.out.println(hline);
@@ -344,7 +351,7 @@ public final class yacy {
         
         // send 'wget' to web interface
         httpHeader requestHeader = new httpHeader();
-	requestHeader.put("Authorization", "realm=" + encodedPassword); // for http-authentify
+        requestHeader.put("REMOTE-SHUTDOWN", "realm=" + encodedPassword); // for http-authentify
         try {
             httpc con = httpc.getInstance("localhost", port, 10000, false);
             httpc.response res = con.GET("Steering.html?shutdown=", requestHeader);
@@ -550,3 +557,31 @@ public final class yacy {
     }
     
 }
+
+class shutdownHookThread extends Thread    
+{
+    private plasmaSwitchboard sb = null;
+    private Thread mainThread = null;
+    
+    public shutdownHookThread(Thread mainThread, plasmaSwitchboard sb) {
+        this.sb = sb;
+        this.mainThread = mainThread;
+    }
+    
+    public void run() {                
+        
+        try {
+            if (!this.sb.isTerminated()) {                
+                serverLog.logSystem("SHUTDOWN","Shutdown via shutdown hook.");
+                
+                // sending the yacy main thread a shutdown signal
+                this.sb.terminate();    
+                
+                // waiting for the yacy thread to finish execution
+                this.mainThread.join();
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}