* reenable DHT if yet enough memory is available

* reset treshold on reconfiguratoin
(thanks to sixcooler)

* display status message in web interface

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6562 6c8d7289-2bf4-0310-a012-ef5d649a1542

htroot/Status.html

@@ -93,6 +93,13 @@
     </dd>
     #(/warningDiskSpaceLow)#
     
+    #(warningMemoryLow)#::
+    <dt class="hintIcon"><img src="env/grafics/bad.png" width="32" height="32" alt="bad"/></dt>
+    <dd class="hint">Free memory is lower than #[minSpace]#. DHT has been disabled. Please fix
+    it as soon as possible and restart YaCy.
+    </dd>
+    #(/warningMemoryLow)#
+    
      <!-- hints -->
     
     #(hintVersionAvailable)#::

htroot/Status.java

@@ -133,13 +133,20 @@ public class Status {
             prop.put("unrestrictedLocalAccess", 1);
         }
 
-        // free disk space
-        if ((adminaccess) && (!sb.observer.getDisksOK()))
-        {
-            final String minFree = Formatter.bytesToString(sb.observer.getMinFreeDiskSpace());
-            prop.put("warningDiskSpaceLow", "1");
-            prop.put("warningDiskSpaceLow_minSpace", minFree);
-        }
+        // resource observer status
+        if (adminaccess) {
+	        if (!sb.observer.getDisksOK()){
+	            final String minFree = Formatter.bytesToString(sb.observer.getMinFreeDiskSpace());
+	            prop.put("warningDiskSpaceLow", "1");
+	            prop.put("warningDiskSpaceLow_minSpace", minFree);
+	        }
+	        if (!sb.observer.getMemoryOK()){
+	            final String minFree = Formatter.bytesToString(sb.observer.getMinFreeMemory() * 1024L);
+	            prop.put("warningMemoryLow", "1");
+	            prop.put("warningMemoryLow_minSpace", minFree);
+	        }
+	        
+	    }
         
         
         // version information

source/de/anomic/crawler/ResourceObserver.java

@@ -56,6 +56,7 @@ public final class ResourceObserver {
     private int checkMemoryUsageCount;
     private int disksFree;
     private int memoryFree;
+    private boolean disabledDHT = false;
     
     /**
      * The ResourceObserver checks the resources
@@ -106,7 +107,7 @@ public final class ResourceObserver {
      * checks the resources and pauses crawls if necessary
      */
     public void resourceObserverJob() {
-    	MemoryControl.setDHTkbytes(sb.getConfigLong(SwitchboardConstants.MEMORY_ACCEPTDHT, 0));
+    	MemoryControl.setDHTkbytes(getMinFreeMemory());
     	
         checkDiskUsageCount++;
         checkMemoryUsageCount++;
@@ -136,11 +137,19 @@ public final class ResourceObserver {
             	log.logInfo("disabling index receive");
                 sb.setConfig(SwitchboardConstants.INDEX_RECEIVE_ALLOW, false);
                 sb.peers.mySeed().setFlagAcceptRemoteIndex(false);
+                disabledDHT = true;
             }
         }
         else {
-            if (DiskSpace.isUsable())
+            if (DiskSpace.isUsable()) {
+            	if(disabledDHT) { // we were wrong!
+            		log.logInfo("enabling index receive");
+                    sb.setConfig(SwitchboardConstants.INDEX_RECEIVE_ALLOW, true);
+                    sb.peers.mySeed().setFlagAcceptRemoteIndex(true);
+                    disabledDHT = false;
+            	}
                 log.logInfo("run completed; everything in order");
+            }
             else
                 log.logInfo("The observer is out of order: " + DiskSpace.getErrorMessage());
         }
@@ -161,19 +170,26 @@ public final class ResourceObserver {
     }
     
     /**
-     * @return amount of space (MiB) that should be kept free
+     * @return amount of space (bytes) that should be kept free
      */
     public long getMinFreeDiskSpace () {
         return sb.getConfigLong(SwitchboardConstants.DISK_FREE, 3000) /* MiB */ * 1024L * 1024L;
     }
     
     /**
-     * @return amount of space (MiB) that should at least be kept free
+     * @return amount of space (bytes) that should at least be kept free
      */
     public long getMinFreeDiskSpace_hardlimit () {
         return sb.getConfigLong(SwitchboardConstants.DISK_FREE_HARDLIMIT, 100) /* MiB */ * 1024L * 1024L;
     }
     
+    /**
+     * @return amount of space (KiB) that should at least be free
+     */
+    public long getMinFreeMemory() {
+    	return sb.getConfigLong(SwitchboardConstants.MEMORY_ACCEPTDHT, 0);
+    }
+    
     /**
      * returns the amount of disk space available
      * @return <ul>

source/net/yacy/kelondro/util/MemoryControl.java

@@ -182,10 +182,12 @@ public class MemoryControl {
     
     public static void setDHTallowed() {
     	allowDHT = true;
+    	DHTtresholdCount = 0;
     }
     
     public static void setDHTkbytes(final long kbytes) {
     	DHTkbytes = kbytes;
+    	DHTtresholdCount = 0;
     }
     
     private static void checkDHTrule(final long available) {
@@ -202,7 +204,8 @@ public class MemoryControl {
     		
 			log.logInfo("checkDHTrule: below treshold; tresholdCount: " + DHTtresholdCount + "; allowDHT: " + allowDHT);
     	}
-    	//allowDHT = ((available >> 10) < DHTkbytes) ? false : true; // stupid
+    	else if (!allowDHT && (available >> 10) > (DHTkbytes * 2L)) // we were wrong!
+    		setDHTallowed();
     }
 
     /**