added shotdown to crawl stacker (moved from 882)

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@889 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/plasma/plasmaCrawlStacker.java

@@ -88,6 +88,23 @@ public final class plasmaCrawlStacker {
         
     }
     
+    public void close() {
+        try {
+            this.log.logFine("Shutdown. Terminationg worker threads.");
+            if (this.theWorkerPool != null) this.theWorkerPool.close();
+        } catch (Exception e1) {
+            this.log.logSevere("Unable to shutdown all remaining stackCrawl threads", e1);
+        }
+        
+        try {
+            this.log.logFine("Shutdown. Closing stackCrawl queue.");
+            if (this.queue != null) this.queue.close();
+            this.queue = null;
+        } catch (IOException e) {
+            this.log.logSevere("DB could not be closed properly.", e);
+        }
+    }
+    
     public int size() {
         return this.queue.size();
     }

source/de/anomic/plasma/plasmaSwitchboard.java

@@ -633,6 +633,7 @@ public final class plasmaSwitchboard extends serverAbstractSwitch implements ser
             userDB.close();
             messageDB.close();
             if (facilityDB != null) facilityDB.close();
+            sbStackCrawlThread.close();
             urlPool.close();
             profiles.close();
             robots.close();