Performacne improvements via adding a netty-based openflowj and openflow plugin;...

[controller.git] / third-party / openflowj_netty / src / main / java / org / openflow / util / LRULinkedHashMap.java

diff --git a/third-party/openflowj_netty/src/main/java/org/openflow/util/LRULinkedHashMap.java b/third-party/openflowj_netty/src/main/java/org/openflow/util/LRULinkedHashMap.java
new file mode 100644 (file)
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--- /dev/null
+++ b/third-party/openflowj_netty/src/main/java/org/openflow/util/LRULinkedHashMap.java
@@ -0,0 +1,42 @@
+/**
+*    Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior
+*    University
+* 
+*    Licensed under the Apache License, Version 2.0 (the "License"); you may
+*    not use this file except in compliance with the License. You may obtain
+*    a copy of the License at
+*
+*         http://www.apache.org/licenses/LICENSE-2.0
+*
+*    Unless required by applicable law or agreed to in writing, software
+*    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+*    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+*    License for the specific language governing permissions and limitations
+*    under the License.
+**/
+
+package org.openflow.util;
+
+import java.util.LinkedHashMap;
+
+public class LRULinkedHashMap<K, V> extends LinkedHashMap<K, V> {
+    private static final long serialVersionUID = -2964986094089626647L;
+    protected int maximumCapacity;
+
+    public LRULinkedHashMap(int initialCapacity, int maximumCapacity) {
+        super(initialCapacity, 0.75f, true);
+        this.maximumCapacity = maximumCapacity;
+    }
+
+    public LRULinkedHashMap(int maximumCapacity) {
+        super(16, 0.75f, true);
+        this.maximumCapacity = maximumCapacity;
+    }
+
+    @Override
+    protected boolean removeEldestEntry(java.util.Map.Entry<K, V> eldest) {
+        if (this.size() > maximumCapacity)
+            return true;
+        return false;
+    }
+}