update to resource observer:

- returns high/medium/low disk space
- pauses crawling on medium disk space
- disables index receive on low disk space

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@5310 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/crawler/ResourceObserver.java

@@ -4,6 +4,8 @@
 // (C) by Detlef Reichl; detlef!reichl()gmx!org
 // Pforzheim, Germany, 2008
 //
+// changes by David Wieditz
+//
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation; either version 2 of the License, or
@@ -39,14 +41,19 @@ public final class ResourceObserver {
     private static final int CHECK_DISK_USAGE_FREQ = 1;
     // The memory usage should be checked on every run
     private static final int CHECK_MEMORY_USAGE_FREQ = 1;
+
+    // return values for available disk/memory
+    private static final int LOW = 0;
+    private static final int MEDIUM = 1;
+    private static final int HIGH = 2;
 
     private final serverLog log = new serverLog("RESOURCE OBSERVER");
     private final plasmaSwitchboard sb;
 
     private int checkDiskUsageCount;
     private int checkMemoryUsageCount;
-    private boolean disksOK;
-    private boolean memoryOK;
+    private int disksFree;
+    private int memoryFree;
 
     public ResourceObserver(final plasmaSwitchboard sb) {
         this.sb = sb;
@@ -76,35 +83,40 @@ public ResourceObserver(final plasmaSwitchboard sb) {
 
         checkDiskUsageCount = 0;
         checkMemoryUsageCount = 0;
-        disksOK = true;
-        memoryOK = true;
+        disksFree = HIGH;
+        memoryFree = HIGH;
     }
 
     public void resourceObserverJob() {
         checkDiskUsageCount++;
         checkMemoryUsageCount++;
-        boolean tmpDisksOK = true;
-        boolean tmpMemoryOK = true;
+        int tmpDisksFree = HIGH;
+        int tmpMemoryFree = HIGH;
         if (checkDiskUsageCount >= CHECK_DISK_USAGE_FREQ) {
             checkDiskUsageCount = 0;
-            tmpDisksOK = checkDisks();
-            disksOK = tmpDisksOK;
+            tmpDisksFree = checkDisks();
+            disksFree = tmpDisksFree;
         }
         if (checkMemoryUsageCount >= CHECK_MEMORY_USAGE_FREQ) {
             checkMemoryUsageCount = 0;
-            tmpMemoryOK = checkMemory();
-            memoryOK = tmpMemoryOK;
+            tmpMemoryFree = checkMemory();
+            memoryFree = tmpMemoryFree;
         }
 
-        if (!tmpDisksOK || !tmpMemoryOK) {
+        if (tmpDisksFree < HIGH || tmpMemoryFree < HIGH) {
             if (!sb.crawlJobIsPaused(plasmaSwitchboardConstants.CRAWLJOB_LOCAL_CRAWL)) {
-                this.log.logInfo("disabling local crawls");
+                this.log.logInfo("pausing local crawls");
                 sb.pauseCrawlJob(plasmaSwitchboardConstants.CRAWLJOB_LOCAL_CRAWL);
             }
             if (!sb.crawlJobIsPaused(plasmaSwitchboardConstants.CRAWLJOB_REMOTE_TRIGGERED_CRAWL)) {
-                this.log.logInfo("disabling remote triggered crawls");
+                this.log.logInfo("pausing remote triggered crawls");
                 sb.pauseCrawlJob(plasmaSwitchboardConstants.CRAWLJOB_REMOTE_TRIGGERED_CRAWL);
             }
+            if (tmpDisksFree == LOW && sb.getConfigBool(plasmaSwitchboardConstants.INDEX_RECEIVE_ALLOW, false)) {
+            	this.log.logInfo("disabling index receive");
+                sb.setConfig(plasmaSwitchboardConstants.INDEX_RECEIVE_ALLOW, false);
+                sb.webIndex.seedDB.mySeed().setFlagAcceptRemoteIndex(false);
+            }
         }
         else {
             if (diskUsage.isUsable())
@@ -115,11 +127,11 @@ public void resourceObserverJob() {
     }
 
     public boolean getDisksOK () {
-        return disksOK;
+        return disksFree == HIGH;
     }
 
     public boolean getMemoryOK () {
-        return memoryOK;
+        return memoryFree == HIGH;
     }
 
     /**
@@ -130,13 +142,19 @@ public long getMinFreeDiskSpace () {
     }
 
     /**
-     * @return enough disk space available?
+     * returns the amount of disk space available
+     * @return <ul>
+     * <li><code>HIGH</code> if disk space is available</li>
+     * <li><code>MEDIUM</code> if low disk space is available</li>
+     * <li><code>LOW</code> if lower than 100MB or 1/5 disk space is available</li>
+     * </ul>
      */
-    private boolean checkDisks() {
-        boolean below = false;    
+
+    private int checkDisks() {
+        int ret = HIGH;   
 
         if (!diskUsage.isUsable ())
-            return true;
+            return HIGH;
 
         final HashMap<String, long[]> usage = diskUsage.getDiskUsage();
         long[] val;
@@ -145,14 +163,17 @@ private boolean checkDisks() {
             this.log.logInfo("df of Volume " + entry.getKey() + ": " + (val[1] / 1024 / 1024) + " MB");
             if (val[1] < getMinFreeDiskSpace()) {
                 this.log.logWarning("Volume " + entry.getKey() + ": free space (" + (val[1] / 1024 / 1024) + " MB) is too low (< " + (getMinFreeDiskSpace() / 1024 / 1024) + " MB)");
-                below = true;
+                ret = MEDIUM;
+            }
+            if (val[1] < Math.min(getMinFreeDiskSpace() / 5L, 100L)) {
+            	ret = LOW;
             }
         }
-        return !below;
+        return ret;
     }
 
-    private boolean checkMemory() {
-        return true;
+    private int checkMemory() {
+        return HIGH;
     }
 }