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java/org/apache/catalina/tribes/io/BufferPool.java

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+/*
+ * 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.catalina.tribes.io;
+
+
+import org.apache.catalina.tribes.util.StringManager;
+import org.apache.juli.logging.Log;
+import org.apache.juli.logging.LogFactory;
+
+/**
+ *
+ *
+ * @version 1.0
+ */
+public class BufferPool {
+    private static final Log log = LogFactory.getLog(BufferPool.class);
+
+    public static final int DEFAULT_POOL_SIZE = 100*1024*1024; //100MB
+
+    protected static final StringManager sm = StringManager.getManager(BufferPool.class);
+
+
+
+    protected static volatile BufferPool instance = null;
+    protected final BufferPoolAPI pool;
+
+    private BufferPool(BufferPoolAPI pool) {
+        this.pool = pool;
+    }
+
+    public XByteBuffer getBuffer(int minSize, boolean discard) {
+        if ( pool != null ) return pool.getBuffer(minSize, discard);
+        else return new XByteBuffer(minSize,discard);
+    }
+
+    public void returnBuffer(XByteBuffer buffer) {
+        if ( pool != null ) pool.returnBuffer(buffer);
+    }
+
+    public void clear() {
+        if ( pool != null ) pool.clear();
+    }
+
+
+    public static BufferPool getBufferPool() {
+        if (instance == null) {
+            synchronized (BufferPool.class) {
+                if (instance == null) {
+                   BufferPoolAPI pool = new BufferPool15Impl();
+                   pool.setMaxSize(DEFAULT_POOL_SIZE);
+                   log.info(sm.getString("bufferPool.created",
+                           Integer.toString(DEFAULT_POOL_SIZE), pool.getClass().getName()));
+                   instance = new BufferPool(pool);
+                }
+            }
+        }
+        return instance;
+    }
+
+
+    public static interface BufferPoolAPI {
+        public void setMaxSize(int bytes);
+
+        public XByteBuffer getBuffer(int minSize, boolean discard);
+
+        public void returnBuffer(XByteBuffer buffer);
+
+        public void clear();
+    }
+}