X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.db.impl%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fimpl%2FMemWatch.java;fp=bundles%2Forg.simantics.db.impl%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fimpl%2FMemWatch.java;h=2683e7f46d9b81f28bfbe277e169c9b999833f32;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/MemWatch.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/MemWatch.java
new file mode 100644
index 000000000..2683e7f46
--- /dev/null
+++ b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/MemWatch.java
@@ -0,0 +1,34 @@
+package org.simantics.db.impl;
+
+import java.lang.ref.WeakReference;
+
+public class MemWatch {
+    public static boolean isLowOnMemory() {
+        return isLowOnMemory;
+    }
+    private static boolean DBBUG = false;
+    private static boolean isLowOnMemory = false;
+    @SuppressWarnings("unused")
+    private static MemWatch memWatch = new MemWatch();
+    private Runtime runtime = Runtime.getRuntime();
+    @SuppressWarnings("unused")
+    private WeakReference<Watch> ref = new WeakReference<Watch>(new Watch());
+    class Watch {
+        @Override
+        protected void finalize() throws Throwable {
+            long fre = runtime.freeMemory();
+            long tot = runtime.totalMemory();
+            long max = runtime.maxMemory();
+            if (tot < max || fre > max / 20) 
+                isLowOnMemory = false;
+            else
+                isLowOnMemory = true;
+            if (DBBUG)
+              System.err.println("Garbage was collected using " + Thread.currentThread().getName()
+              + " fre=" + fre + " tot=" + tot + " max=" + max
+              + " low=" + isLowOnMemory);
+            ref = new WeakReference<Watch>(new Watch());
+            super.finalize();
+        }
+    }
+}