| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.io; |
| |
| import java.nio.ByteBuffer; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import java.util.function.Function; |
| |
| import org.eclipse.jetty.util.BufferUtil; |
| |
| public class MappedByteBufferPool implements ByteBufferPool |
| { |
| private final ConcurrentMap<Integer, Bucket> directBuffers = new ConcurrentHashMap<>(); |
| private final ConcurrentMap<Integer, Bucket> heapBuffers = new ConcurrentHashMap<>(); |
| private final int _factor; |
| private final int _maxQueue; |
| private final Function<Integer, Bucket> _newBucket; |
| |
| public MappedByteBufferPool() |
| { |
| this(-1); |
| } |
| |
| public MappedByteBufferPool(int factor) |
| { |
| this(factor,-1,null); |
| } |
| |
| public MappedByteBufferPool(int factor,int maxQueue) |
| { |
| this(factor,maxQueue,null); |
| } |
| |
| public MappedByteBufferPool(int factor,int maxQueue,Function<Integer, Bucket> newBucket) |
| { |
| _factor = factor<=0?1024:factor; |
| _maxQueue = maxQueue; |
| _newBucket = newBucket!=null?newBucket:i->new Bucket(this,i*_factor,_maxQueue); |
| } |
| |
| @Override |
| public ByteBuffer acquire(int size, boolean direct) |
| { |
| int b = bucketFor(size); |
| ConcurrentMap<Integer, Bucket> buffers = bucketsFor(direct); |
| |
| Bucket bucket = buffers.get(b); |
| if (bucket==null) |
| return newByteBuffer(b*_factor, direct); |
| return bucket.acquire(direct); |
| } |
| |
| @Override |
| public void release(ByteBuffer buffer) |
| { |
| if (buffer == null) |
| return; // nothing to do |
| |
| // validate that this buffer is from this pool |
| assert((buffer.capacity() % _factor) == 0); |
| |
| int b = bucketFor(buffer.capacity()); |
| ConcurrentMap<Integer, Bucket> buckets = bucketsFor(buffer.isDirect()); |
| |
| Bucket bucket = buckets.computeIfAbsent(b,_newBucket); |
| bucket.release(buffer); |
| } |
| |
| public void clear() |
| { |
| directBuffers.values().forEach(Bucket::clear); |
| directBuffers.clear(); |
| heapBuffers.values().forEach(Bucket::clear); |
| heapBuffers.clear(); |
| } |
| |
| private int bucketFor(int size) |
| { |
| int bucket = size / _factor; |
| if (size % _factor > 0) |
| ++bucket; |
| return bucket; |
| } |
| |
| // Package local for testing |
| ConcurrentMap<Integer, Bucket> bucketsFor(boolean direct) |
| { |
| return direct ? directBuffers : heapBuffers; |
| } |
| |
| public static class Tagged extends MappedByteBufferPool |
| { |
| private final AtomicInteger tag = new AtomicInteger(); |
| |
| @Override |
| public ByteBuffer newByteBuffer(int capacity, boolean direct) |
| { |
| ByteBuffer buffer = super.newByteBuffer(capacity + 4, direct); |
| buffer.limit(buffer.capacity()); |
| buffer.putInt(tag.incrementAndGet()); |
| ByteBuffer slice = buffer.slice(); |
| BufferUtil.clear(slice); |
| return slice; |
| } |
| } |
| } |