1 files changed, 110 insertions, 0 deletions
diff --git a/plugins/org.eclipse.net4j.util/src/org/eclipse/net4j/util/cache/CacheRegistration.java b/plugins/org.eclipse.net4j.util/src/org/eclipse/net4j/util/cache/CacheRegistration.java
new file mode 100644
index 0000000000..bb94cbd75f
--- /dev/null
+++ b/plugins/org.eclipse.net4j.util/src/org/eclipse/net4j/util/cache/CacheRegistration.java
@@ -0,0 +1,110 @@
+/***************************************************************************
+ * Copyright (c) 2004 - 2008 Eike Stepper, Germany.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Contributors:
+ *    Eike Stepper - initial API and implementation
+ **************************************************************************/
+package org.eclipse.net4j.util.cache;
+
+/**
+ * @author Eike Stepper
+ */
+public class CacheRegistration implements ICacheRegistration
+{
+  public static final float DEFAULT_RECONSTRUCTION_COST_DECAY_FACTOR = 0.1f;
+
+  private ICacheMonitor cacheMonitor;
+
+  private ICache cache;
+
+  private int elementCount;
+
+  private long cacheSize;
+
+  private long reconstructionCost;
+
+  public CacheRegistration(ICacheMonitor cacheMonitor, ICache cache)
+  {
+    this.cacheMonitor = cacheMonitor;
+    this.cache = cache;
+  }
+
+  public void dispose()
+  {
+    cacheMonitor = null;
+    cache = null;
+  }
+
+  public boolean isDisposed()
+  {
+    return cacheMonitor == null || cache == null;
+  }
+
+  public ICacheMonitor getCacheMonitor()
+  {
+    return cacheMonitor;
+  }
+
+  public ICache getCache()
+  {
+    return cache;
+  }
+
+  public int getElementCount()
+  {
+    return elementCount;
+  }
+
+  public long getCacheSize()
+  {
+    return cacheSize;
+  }
+
+  public long getAverageElementSize()
+  {
+    return cacheSize / elementCount;
+  }
+
+  public long getReconstructionCost()
+  {
+    return reconstructionCost;
+  }
+
+  public void elementCached(int elementSize)
+  {
+    checkDisposal();
+    ++elementCount;
+    cacheSize += elementSize;
+  }
+
+  public void elementEvicted(int elementSize)
+  {
+    checkDisposal();
+    --elementCount;
+    cacheSize -= elementSize;
+  }
+
+  public void elementReconstructed(long reconstructionTime)
+  {
+    checkDisposal();
+    float decayFactor = getReconstructionCostDecayFactor();
+    this.reconstructionCost = (long)(decayFactor * this.reconstructionCost + (1 - decayFactor) * reconstructionTime);
+  }
+
+  protected float getReconstructionCostDecayFactor()
+  {
+    return DEFAULT_RECONSTRUCTION_COST_DECAY_FACTOR;
+  }
+
+  private void checkDisposal()
+  {
+    if (isDisposed())
+    {
+      throw new IllegalStateException("disposed");
+    }
+  }
+}