| /* |
| * 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.synapse.transport.passthru.util; |
| |
| import org.apache.http.nio.util.ByteBufferAllocator; |
| import org.apache.http.nio.util.HeapByteBufferAllocator; |
| |
| import java.util.concurrent.locks.Lock; |
| import java.util.concurrent.locks.ReentrantLock; |
| |
| public class BufferFactory { |
| |
| private volatile ControlledByteBuffer [] 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 = HeapByteBufferAllocator.INSTANCE; |
| } |
| |
| buffers = new ControlledByteBuffer[size]; |
| } |
| |
| public ControlledByteBuffer getBuffer() { |
| if (marker == -1) { |
| return new ControlledByteBuffer(allocator.allocate(bufferSize)); |
| } else { |
| try { |
| lock.lock(); |
| if (marker >= 0) { |
| ControlledByteBuffer controlledByteBuffer = buffers[marker]; |
| controlledByteBuffer.clear(); |
| controlledByteBuffer.forceSetInputMode(); |
| buffers[marker] = null; |
| marker--; |
| return controlledByteBuffer; |
| } |
| } finally { |
| lock.unlock(); |
| } |
| } |
| return new ControlledByteBuffer(allocator.allocate(bufferSize)); |
| } |
| |
| public void release(ControlledByteBuffer buffer) { |
| try { |
| lock.lock(); |
| if (marker < buffers.length - 1) { |
| buffer.clear(); |
| buffer.forceSetInputMode(); |
| buffers[++marker] = buffer; |
| } |
| } finally { |
| lock.unlock(); |
| } |
| } |
| } |