From e5b7380c874745c989d1816b8f552504f038e1bc Mon Sep 17 00:00:00 2001
From: lresende <lresende@13f79535-47bb-0310-9956-ffa450edef68>
Date: Thu, 26 Sep 2013 20:33:20 +0000
Subject: 2.0 branch for possible maintenance release

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1526672 13f79535-47bb-0310-9956-ffa450edef68
---
 .../sca/common/java/collection/LRUCache.java       | 89 ++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 sca-java-2.x/branches/2.0/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/LRUCache.java

(limited to 'sca-java-2.x/branches/2.0/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/LRUCache.java')

diff --git a/sca-java-2.x/branches/2.0/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/LRUCache.java b/sca-java-2.x/branches/2.0/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/LRUCache.java
new file mode 100644
index 0000000000..41286aa0f9
--- /dev/null
+++ b/sca-java-2.x/branches/2.0/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/LRUCache.java
@@ -0,0 +1,89 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.apache.tuscany.sca.common.java.collection;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * A Simple LRU Cache
+ * 
+ * @version $Revision$
+ * @param <K>
+ * @param <V>
+ * @tuscany.spi.extension.asclient
+ */
+
+public class LRUCache<K, V> extends LinkedHashMap<K, V> {
+    private static final long serialVersionUID = -342098639681884413L;
+    protected int maxCacheSize = 4096;
+
+    /**
+     * Default constructor for an LRU Cache The default capacity is 4096
+     */
+    public LRUCache() {
+        this(0, 4096, 0.75f, true);
+    }
+
+    /**
+     * Constructs a LRUCache with a maximum capacity
+     * 
+     * @param maximumCacheSize
+     */
+    public LRUCache(int maximumCacheSize) {
+        this(0, maximumCacheSize, 0.75f, true);
+    }
+
+    /**
+     * Constructs an empty <tt>LRUCache</tt> instance with the specified
+     * initial capacity, maximumCacheSize,load factor and ordering mode.
+     * 
+     * @param initialCapacity the initial capacity.
+     * @param maximumCacheSize
+     * @param loadFactor the load factor.
+     * @param accessOrder the ordering mode - <tt>true</tt> for access-order,
+     *                <tt>false</tt> for insertion-order.
+     * @throws IllegalArgumentException if the initial capacity is negative or
+     *                 the load factor is non-positive.
+     */
+
+    public LRUCache(int initialCapacity, int maximumCacheSize, float loadFactor, boolean accessOrder) {
+        super(initialCapacity, loadFactor, accessOrder);
+        this.maxCacheSize = maximumCacheSize;
+    }
+
+    /**
+     * @return Returns the maxCacheSize.
+     */
+    public int getMaxCacheSize() {
+        return maxCacheSize;
+    }
+
+    /**
+     * @param maxCacheSize The maxCacheSize to set.
+     */
+    public void setMaxCacheSize(int maxCacheSize) {
+        this.maxCacheSize = maxCacheSize;
+    }
+
+    @Override
+    protected boolean removeEldestEntry(Map.Entry<K, V> eldest) {
+        return size() > maxCacheSize;
+    }
+}
-- 
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