memory control for ymage generation:

the ymageMatrix initializer throws an RuntimeException if there is not
enough memory available to generate a new ymage of wanted size

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@2541 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/server/serverMemory.java

@@ -57,6 +57,13 @@ public class serverMemory {
         // memory that is free without increasing of total memory taken from os
         return runtime.freeMemory();
     }
+   
+    public static boolean available(long memory, boolean gciffail) {
+        if (available() >= memory) return true;
+        if (!gciffail) return false;
+        System.gc();
+        return (available() >= memory);
+    }
     
     public static long available() {
         // memory that is available including increasing total memory up to maximum

source/de/anomic/ymage/ymageMatrix.java

@@ -47,6 +47,8 @@
 
 package de.anomic.ymage;
 
+import de.anomic.server.serverMemory;
+
 public class ymageMatrix implements Cloneable {
     
     // colors regarding RGB Color Model
@@ -72,7 +74,8 @@ public class ymageMatrix implements Cloneable {
     private byte   defaultMode;
     private boolean grabComplementary = false;
     
-    public ymageMatrix(ymageMatrix matrix) {
+    public ymageMatrix(ymageMatrix matrix) throws RuntimeException {
+        if (serverMemory.available(1024 * 1024 + 3 * width * height, true)) throw new RuntimeException("ymage: not enough memory (" + serverMemory.available() + ") available");
         // clones the matrix
         this.width = matrix.width;
         this.height = matrix.height;
@@ -90,6 +93,7 @@ public class ymageMatrix implements Cloneable {
     }
     
     public ymageMatrix(int width, int height, long backgroundColor) {
+        if (serverMemory.available(1024 * 1024 + 3 * width * height, true)) throw new RuntimeException("ymage: not enough memory (" + serverMemory.available() + ") available");
         this.width = width;
         this.height = height;
         this.defaultColR = 0xFF;