/**
* Copyright (c) 2009, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* 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.wso2.carbon.transport.relay.util;
import org.apache.http.nio.util.ByteBufferAllocator;
import org.apache.http.nio.util.HeapByteBufferAllocator;
import java.nio.ByteBuffer;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class BufferFactory {
private volatile ByteBuffer [] buffers;
private volatile int marker = -1;
private ByteBufferAllocator allocator = null;
private Lock lock = new ReentrantLock();
private int bufferSize = 1024 * 8;
public BufferFactory(int bufferSize, ByteBufferAllocator allocator, int size) {
this.bufferSize = bufferSize;
if (allocator != null) {
this.allocator = allocator;
} else {
this.allocator = new HeapByteBufferAllocator();
}
buffers = new ByteBuffer[size];
}
public ByteBuffer getBuffer() {
if (marker == -1) {
//System.out.println("allocating marker -1");
return allocator.allocate(bufferSize);
} else {
lock.lock();
try {
if (marker >= 0) {
// System.out.println("Returning buffer");
ByteBuffer b = buffers[marker];
buffers[marker] = null;
marker--;
return b;
}
} finally {
lock.unlock();
}
}
return allocator.allocate(bufferSize);
}
public void release(ByteBuffer buffer) {
lock.lock();
try {
if (marker < buffers.length - 1) {
buffers[++marker] = buffer;
}
} finally {
lock.unlock();
}
}
}