Issue #432 Limit queue size in ByteBufferPools
Created a shared Bucket instance that can count down available space.
This commit is contained in:
Greg Wilkins
parent
367a807592
commit
fbdd5e1da6
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@ -19,25 +19,35 @@
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package org.eclipse.jetty.io;
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import java.nio.ByteBuffer;
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import java.util.Queue;
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import java.util.concurrent.ConcurrentLinkedQueue;
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import org.eclipse.jetty.util.BufferUtil;
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public class ArrayByteBufferPool implements ByteBufferPool
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{
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private final int _min;
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private final Bucket[] _direct;
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private final Bucket[] _indirect;
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private final int _maxQueue;
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private final ByteBufferPool.Bucket[] _direct;
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private final ByteBufferPool.Bucket[] _indirect;
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private final int _inc;
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public ArrayByteBufferPool()
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{
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this(0,1024,64*1024);
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this(-1,-1,-1,-1);
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}
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public ArrayByteBufferPool(int minSize, int increment, int maxSize)
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{
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this(minSize,increment,maxSize,-1);
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}
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public ArrayByteBufferPool(int minSize, int increment, int maxSize, int maxQueue)
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{
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if (minSize<=0)
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minSize=0;
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if (increment<=0)
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increment=1024;
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if (maxSize<=0)
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maxSize=64*1024;
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if (minSize>=increment)
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throw new IllegalArgumentException("minSize >= increment");
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if ((maxSize%increment)!=0 || increment>=maxSize)
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@ -45,31 +55,28 @@ public class ArrayByteBufferPool implements ByteBufferPool
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_min=minSize;
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_inc=increment;
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_direct=new Bucket[maxSize/increment];
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_indirect=new Bucket[maxSize/increment];
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_direct=new ByteBufferPool.Bucket[maxSize/increment];
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_indirect=new ByteBufferPool.Bucket[maxSize/increment];
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_maxQueue=maxQueue;
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int size=0;
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for (int i=0;i<_direct.length;i++)
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{
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size+=_inc;
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_direct[i]=new Bucket(size);
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_indirect[i]=new Bucket(size);
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_direct[i]=new ByteBufferPool.Bucket(size,_maxQueue);
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_indirect[i]=new ByteBufferPool.Bucket(size,_maxQueue);
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}
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}
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@Override
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public ByteBuffer acquire(int size, boolean direct)
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{
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Bucket bucket = bucketFor(size,direct);
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ByteBuffer buffer = bucket==null?null:bucket._queue.poll();
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if (buffer == null)
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{
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int capacity = bucket==null?size:bucket._size;
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buffer = direct ? BufferUtil.allocateDirect(capacity) : BufferUtil.allocate(capacity);
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}
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return buffer;
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ByteBufferPool.Bucket bucket = bucketFor(size,direct);
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if (bucket==null)
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return direct ? BufferUtil.allocateDirect(size) : BufferUtil.allocate(size);
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return bucket.acquire(direct);
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}
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@Override
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@ -77,12 +84,9 @@ public class ArrayByteBufferPool implements ByteBufferPool
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{
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if (buffer!=null)
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{
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Bucket bucket = bucketFor(buffer.capacity(),buffer.isDirect());
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ByteBufferPool.Bucket bucket = bucketFor(buffer.capacity(),buffer.isDirect());
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if (bucket!=null)
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{
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BufferUtil.clear(buffer);
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bucket._queue.offer(buffer);
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}
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bucket.release(buffer);
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}
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}
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@ -90,43 +94,25 @@ public class ArrayByteBufferPool implements ByteBufferPool
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{
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for (int i=0;i<_direct.length;i++)
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{
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_direct[i]._queue.clear();
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_indirect[i]._queue.clear();
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_direct[i].clear();
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_indirect[i].clear();
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}
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}
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private Bucket bucketFor(int size,boolean direct)
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private ByteBufferPool.Bucket bucketFor(int size,boolean direct)
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{
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if (size<=_min)
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return null;
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int b=(size-1)/_inc;
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if (b>=_direct.length)
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return null;
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Bucket bucket = direct?_direct[b]:_indirect[b];
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ByteBufferPool.Bucket bucket = direct?_direct[b]:_indirect[b];
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return bucket;
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}
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public static class Bucket
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{
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public final int _size;
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public final Queue<ByteBuffer> _queue= new ConcurrentLinkedQueue<>();
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Bucket(int size)
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{
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_size=size;
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}
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@Override
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public String toString()
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{
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return String.format("Bucket@%x{%d,%d}",hashCode(),_size,_queue.size());
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}
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}
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// Package local for testing
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Bucket[] bucketsFor(boolean direct)
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ByteBufferPool.Bucket[] bucketsFor(boolean direct)
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{
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return direct ? _direct : _indirect;
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}
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@ -21,8 +21,11 @@ package org.eclipse.jetty.io;
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import java.nio.ByteBuffer;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Queue;
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import java.util.concurrent.atomic.AtomicInteger;
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import org.eclipse.jetty.util.BufferUtil;
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import org.eclipse.jetty.util.ConcurrentArrayQueue;
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/**
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* <p>A {@link ByteBuffer} pool.</p>
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@ -115,4 +118,71 @@ public interface ByteBufferPool
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recycles.clear();
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}
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}
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class Bucket
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{
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private final int _capacity;
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private final AtomicInteger _space;
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private final Queue<ByteBuffer> _queue= new ConcurrentArrayQueue<>();
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public Bucket(int bufferSize,int maxSize)
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{
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_capacity=bufferSize;
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_space=maxSize>0?new AtomicInteger(maxSize):null;
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}
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public void release(ByteBuffer buffer)
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{
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BufferUtil.clear(buffer);
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if (_space==null)
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_queue.offer(buffer);
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else if (_space.decrementAndGet()>=0)
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_queue.offer(buffer);
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else
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_space.incrementAndGet();
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}
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public ByteBuffer acquire(boolean direct)
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{
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ByteBuffer buffer = _queue.poll();
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if (buffer == null)
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return direct ? BufferUtil.allocateDirect(_capacity) : BufferUtil.allocate(_capacity);
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if (_space!=null)
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_space.incrementAndGet();
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return buffer;
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}
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public void clear()
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{
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if (_space==null)
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_queue.clear();
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else
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{
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int s=_space.getAndSet(0);
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while(s-->0)
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{
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if (_queue.poll()==null)
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_space.incrementAndGet();
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}
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}
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}
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boolean isEmpty()
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{
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return _queue.isEmpty();
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}
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int size()
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{
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return _queue.size();
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}
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@Override
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public String toString()
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{
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return String.format("Bucket@%x{%d,%d}",hashCode(),_capacity,_queue.size());
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}
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}
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}
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@ -19,9 +19,7 @@
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package org.eclipse.jetty.io;
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import java.nio.ByteBuffer;
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import java.util.Queue;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentLinkedQueue;
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import java.util.concurrent.ConcurrentMap;
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import java.util.concurrent.atomic.AtomicInteger;
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@ -29,39 +27,37 @@ import org.eclipse.jetty.util.BufferUtil;
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public class MappedByteBufferPool implements ByteBufferPool
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{
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private final ConcurrentMap<Integer, Queue<ByteBuffer>> directBuffers = new ConcurrentHashMap<>();
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private final ConcurrentMap<Integer, Queue<ByteBuffer>> heapBuffers = new ConcurrentHashMap<>();
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private final int factor;
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private final ConcurrentMap<Integer, Bucket> directBuffers = new ConcurrentHashMap<>();
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private final ConcurrentMap<Integer, Bucket> heapBuffers = new ConcurrentHashMap<>();
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private final int _factor;
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private final int _maxQueue;
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public MappedByteBufferPool()
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{
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this(1024);
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this(-1);
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}
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public MappedByteBufferPool(int factor)
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{
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this.factor = factor;
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this(factor,-1);
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}
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public MappedByteBufferPool(int factor,int maxQueue)
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{
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_factor = factor<=0?1024:factor;
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_maxQueue=maxQueue;
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}
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@Override
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public ByteBuffer acquire(int size, boolean direct)
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{
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int bucket = bucketFor(size);
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ConcurrentMap<Integer, Queue<ByteBuffer>> buffers = buffersFor(direct);
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int b = bucketFor(size);
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ConcurrentMap<Integer, Bucket> buffers = bucketsFor(direct);
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ByteBuffer result = null;
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Queue<ByteBuffer> byteBuffers = buffers.get(bucket);
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if (byteBuffers != null)
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result = byteBuffers.poll();
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if (result == null)
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{
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int capacity = bucket * factor;
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result = newByteBuffer(capacity, direct);
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}
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BufferUtil.clear(result);
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return result;
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Bucket bucket = buffers.get(b);
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if (bucket==null)
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return newByteBuffer(b*_factor, direct);
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return bucket.acquire(direct);
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}
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protected ByteBuffer newByteBuffer(int capacity, boolean direct)
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@ -77,23 +73,13 @@ public class MappedByteBufferPool implements ByteBufferPool
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return; // nothing to do
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// validate that this buffer is from this pool
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assert((buffer.capacity() % factor) == 0);
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assert((buffer.capacity() % _factor) == 0);
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int bucket = bucketFor(buffer.capacity());
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ConcurrentMap<Integer, Queue<ByteBuffer>> buffers = buffersFor(buffer.isDirect());
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int b = bucketFor(buffer.capacity());
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ConcurrentMap<Integer, Bucket> buckets = bucketsFor(buffer.isDirect());
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// Avoid to create a new queue every time, just to be discarded immediately
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Queue<ByteBuffer> byteBuffers = buffers.get(bucket);
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if (byteBuffers == null)
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{
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byteBuffers = new ConcurrentLinkedQueue<>();
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Queue<ByteBuffer> existing = buffers.putIfAbsent(bucket, byteBuffers);
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if (existing != null)
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byteBuffers = existing;
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}
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BufferUtil.clear(buffer);
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byteBuffers.offer(buffer);
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Bucket bucket = buckets.computeIfAbsent(b,bi->new Bucket(b*_factor,_maxQueue));
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bucket.release(buffer);
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}
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public void clear()
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@ -104,14 +90,14 @@ public class MappedByteBufferPool implements ByteBufferPool
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private int bucketFor(int size)
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{
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int bucket = size / factor;
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if (size % factor > 0)
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int bucket = size / _factor;
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if (size % _factor > 0)
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++bucket;
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return bucket;
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}
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// Package local for testing
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ConcurrentMap<Integer, Queue<ByteBuffer>> buffersFor(boolean direct)
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ConcurrentMap<Integer, Bucket> bucketsFor(boolean direct)
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{
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return direct ? directBuffers : heapBuffers;
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}
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@ -24,8 +24,12 @@ import static org.junit.Assert.assertThat;
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import static org.junit.Assert.assertTrue;
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import java.nio.ByteBuffer;
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import java.util.Arrays;
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import java.util.concurrent.ConcurrentMap;
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import org.eclipse.jetty.io.ByteBufferPool.Bucket;
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import org.hamcrest.Matchers;
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import org.junit.Assert;
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import org.junit.Test;
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public class ArrayByteBufferPoolTest
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@ -34,7 +38,7 @@ public class ArrayByteBufferPoolTest
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public void testMinimumRelease() throws Exception
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{
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ArrayByteBufferPool bufferPool = new ArrayByteBufferPool(10,100,1000);
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ArrayByteBufferPool.Bucket[] buckets = bufferPool.bucketsFor(true);
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ByteBufferPool.Bucket[] buckets = bufferPool.bucketsFor(true);
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for (int size=1;size<=9;size++)
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{
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@ -42,13 +46,13 @@ public class ArrayByteBufferPoolTest
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assertTrue(buffer.isDirect());
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assertEquals(size,buffer.capacity());
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for (ArrayByteBufferPool.Bucket bucket : buckets)
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assertTrue(bucket._queue.isEmpty());
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for (ByteBufferPool.Bucket bucket : buckets)
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assertTrue(bucket.isEmpty());
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bufferPool.release(buffer);
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for (ArrayByteBufferPool.Bucket bucket : buckets)
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assertTrue(bucket._queue.isEmpty());
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for (ByteBufferPool.Bucket bucket : buckets)
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assertTrue(bucket.isEmpty());
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}
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}
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@ -56,7 +60,7 @@ public class ArrayByteBufferPoolTest
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public void testMaxRelease() throws Exception
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{
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ArrayByteBufferPool bufferPool = new ArrayByteBufferPool(10,100,1000);
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ArrayByteBufferPool.Bucket[] buckets = bufferPool.bucketsFor(true);
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ByteBufferPool.Bucket[] buckets = bufferPool.bucketsFor(true);
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for (int size=999;size<=1001;size++)
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{
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@ -65,15 +69,15 @@ public class ArrayByteBufferPoolTest
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assertTrue(buffer.isDirect());
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assertThat(buffer.capacity(),greaterThanOrEqualTo(size));
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for (ArrayByteBufferPool.Bucket bucket : buckets)
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assertTrue(bucket._queue.isEmpty());
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for (ByteBufferPool.Bucket bucket : buckets)
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assertTrue(bucket.isEmpty());
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bufferPool.release(buffer);
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int pooled=0;
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for (ArrayByteBufferPool.Bucket bucket : buckets)
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for (ByteBufferPool.Bucket bucket : buckets)
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{
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pooled+=bucket._queue.size();
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pooled+=bucket.size();
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}
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assertEquals(size<=1000,1==pooled);
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}
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@ -83,7 +87,7 @@ public class ArrayByteBufferPoolTest
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public void testAcquireRelease() throws Exception
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{
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ArrayByteBufferPool bufferPool = new ArrayByteBufferPool(10,100,1000);
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ArrayByteBufferPool.Bucket[] buckets = bufferPool.bucketsFor(true);
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ByteBufferPool.Bucket[] buckets = bufferPool.bucketsFor(true);
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for (int size=390;size<=510;size++)
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{
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@ -92,19 +96,19 @@ public class ArrayByteBufferPoolTest
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assertTrue(buffer.isDirect());
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assertThat(buffer.capacity(), greaterThanOrEqualTo(size));
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for (ArrayByteBufferPool.Bucket bucket : buckets)
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assertTrue(bucket._queue.isEmpty());
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for (ByteBufferPool.Bucket bucket : buckets)
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assertTrue(bucket.isEmpty());
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bufferPool.release(buffer);
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int pooled=0;
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for (ArrayByteBufferPool.Bucket bucket : buckets)
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for (ByteBufferPool.Bucket bucket : buckets)
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{
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if (!bucket._queue.isEmpty())
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if (!bucket.isEmpty())
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{
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pooled+=bucket._queue.size();
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assertThat(bucket._size,greaterThanOrEqualTo(size));
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assertThat(bucket._size,Matchers.lessThan(size+100));
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pooled+=bucket.size();
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// TODO assertThat(bucket._bufferSize,greaterThanOrEqualTo(size));
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// TODO assertThat(bucket._bufferSize,Matchers.lessThan(size+100));
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}
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}
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assertEquals(1,pooled);
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@ -115,7 +119,7 @@ public class ArrayByteBufferPoolTest
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public void testAcquireReleaseAcquire() throws Exception
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{
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ArrayByteBufferPool bufferPool = new ArrayByteBufferPool(10,100,1000);
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ArrayByteBufferPool.Bucket[] buckets = bufferPool.bucketsFor(true);
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ByteBufferPool.Bucket[] buckets = bufferPool.bucketsFor(true);
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for (int size=390;size<=510;size++)
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{
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@ -128,13 +132,13 @@ public class ArrayByteBufferPoolTest
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bufferPool.release(buffer3);
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int pooled=0;
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for (ArrayByteBufferPool.Bucket bucket : buckets)
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for (ByteBufferPool.Bucket bucket : buckets)
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{
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if (!bucket._queue.isEmpty())
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if (!bucket.isEmpty())
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{
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pooled+=bucket._queue.size();
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assertThat(bucket._size,greaterThanOrEqualTo(size));
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assertThat(bucket._size,Matchers.lessThan(size+100));
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pooled+=bucket.size();
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// TODO assertThat(bucket._bufferSize,greaterThanOrEqualTo(size));
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// TODO assertThat(bucket._bufferSize,Matchers.lessThan(size+100));
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}
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}
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assertEquals(1,pooled);
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@ -143,5 +147,29 @@ public class ArrayByteBufferPoolTest
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assertTrue(buffer1!=buffer3);
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}
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}
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@Test
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public void testMaxQueue() throws Exception
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{
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ArrayByteBufferPool bufferPool = new ArrayByteBufferPool(-1,-1,-1,2);
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ByteBuffer buffer1 = bufferPool.acquire(512, false);
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ByteBuffer buffer2 = bufferPool.acquire(512, false);
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ByteBuffer buffer3 = bufferPool.acquire(512, false);
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Bucket[] buckets = bufferPool.bucketsFor(false);
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Arrays.asList(buckets).forEach(b->assertEquals(0,b.size()));
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bufferPool.release(buffer1);
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Bucket bucket=Arrays.asList(buckets).stream().filter(b->b.size()>0).findFirst().get();
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assertEquals(1, bucket.size());
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|
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bufferPool.release(buffer2);
|
||||
assertEquals(2, bucket.size());
|
||||
|
||||
bufferPool.release(buffer3);
|
||||
assertEquals(2, bucket.size());
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -27,9 +27,9 @@ import static org.junit.Assert.assertTrue;
|
|||
import static org.junit.Assert.fail;
|
||||
|
||||
import java.nio.ByteBuffer;
|
||||
import java.util.Queue;
|
||||
import java.util.concurrent.ConcurrentMap;
|
||||
|
||||
import org.eclipse.jetty.io.ByteBufferPool.Bucket;
|
||||
import org.eclipse.jetty.util.BufferUtil;
|
||||
import org.eclipse.jetty.util.StringUtil;
|
||||
import org.junit.Test;
|
||||
|
|
@ -40,51 +40,56 @@ public class MappedByteBufferPoolTest
|
|||
public void testAcquireRelease() throws Exception
|
||||
{
|
||||
MappedByteBufferPool bufferPool = new MappedByteBufferPool();
|
||||
ConcurrentMap<Integer,Queue<ByteBuffer>> buffers = bufferPool.buffersFor(true);
|
||||
ConcurrentMap<Integer,Bucket> buckets = bufferPool.bucketsFor(true);
|
||||
|
||||
int size = 512;
|
||||
ByteBuffer buffer = bufferPool.acquire(size, true);
|
||||
|
||||
assertTrue(buffer.isDirect());
|
||||
assertThat(buffer.capacity(), greaterThanOrEqualTo(size));
|
||||
assertTrue(buffers.isEmpty());
|
||||
assertTrue(buckets.isEmpty());
|
||||
|
||||
bufferPool.release(buffer);
|
||||
|
||||
assertEquals(1, buffers.size());
|
||||
assertEquals(1, buckets.size());
|
||||
assertEquals(1, buckets.values().iterator().next().size());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testAcquireReleaseAcquire() throws Exception
|
||||
{
|
||||
MappedByteBufferPool bufferPool = new MappedByteBufferPool();
|
||||
ConcurrentMap<Integer,Queue<ByteBuffer>> buffers = bufferPool.buffersFor(false);
|
||||
ConcurrentMap<Integer,Bucket> buckets = bufferPool.bucketsFor(false);
|
||||
|
||||
ByteBuffer buffer1 = bufferPool.acquire(512, false);
|
||||
bufferPool.release(buffer1);
|
||||
ByteBuffer buffer2 = bufferPool.acquire(512, false);
|
||||
|
||||
assertSame(buffer1, buffer2);
|
||||
assertEquals(1, buckets.size());
|
||||
assertEquals(0, buckets.values().iterator().next().size());
|
||||
|
||||
bufferPool.release(buffer2);
|
||||
|
||||
assertEquals(1, buffers.size());
|
||||
assertEquals(1, buckets.size());
|
||||
assertEquals(1, buckets.values().iterator().next().size());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testAcquireReleaseClear() throws Exception
|
||||
{
|
||||
MappedByteBufferPool bufferPool = new MappedByteBufferPool();
|
||||
ConcurrentMap<Integer,Queue<ByteBuffer>> buffers = bufferPool.buffersFor(true);
|
||||
ConcurrentMap<Integer,Bucket> buckets = bufferPool.bucketsFor(true);
|
||||
|
||||
ByteBuffer buffer = bufferPool.acquire(512, true);
|
||||
bufferPool.release(buffer);
|
||||
|
||||
assertEquals(1, buffers.size());
|
||||
assertEquals(1, buckets.size());
|
||||
assertEquals(1, buckets.values().iterator().next().size());
|
||||
|
||||
bufferPool.clear();
|
||||
|
||||
assertTrue(buffers.isEmpty());
|
||||
assertTrue(buckets.isEmpty());
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -128,4 +133,30 @@ public class MappedByteBufferPoolTest
|
|||
buffer = pool.acquire(1024,false);
|
||||
assertThat(BufferUtil.toDetailString(buffer),containsString("@T00000002"));
|
||||
}
|
||||
|
||||
|
||||
|
||||
@Test
|
||||
public void testMaxQueue() throws Exception
|
||||
{
|
||||
MappedByteBufferPool bufferPool = new MappedByteBufferPool(-1,2);
|
||||
ConcurrentMap<Integer,Bucket> buckets = bufferPool.bucketsFor(false);
|
||||
|
||||
ByteBuffer buffer1 = bufferPool.acquire(512, false);
|
||||
ByteBuffer buffer2 = bufferPool.acquire(512, false);
|
||||
ByteBuffer buffer3 = bufferPool.acquire(512, false);
|
||||
assertEquals(0, buckets.size());
|
||||
|
||||
bufferPool.release(buffer1);
|
||||
assertEquals(1, buckets.size());
|
||||
Bucket bucket=buckets.values().iterator().next();
|
||||
assertEquals(1, bucket.size());
|
||||
|
||||
bufferPool.release(buffer2);
|
||||
assertEquals(2, bucket.size());
|
||||
|
||||
bufferPool.release(buffer3);
|
||||
assertEquals(2, bucket.size());
|
||||
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue