io.netty.buffer.UnpooledByteBufAllocator Maven / Gradle / Ivy
/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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:
*
* https://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 io.netty.buffer;
import io.netty.util.internal.LongCounter;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.StringUtil;
import java.nio.ByteBuffer;
/**
* Simplistic {@link ByteBufAllocator} implementation that does not pool anything.
*/
public final class UnpooledByteBufAllocator extends AbstractByteBufAllocator implements ByteBufAllocatorMetricProvider {
private final UnpooledByteBufAllocatorMetric metric = new UnpooledByteBufAllocatorMetric();
private final boolean disableLeakDetector;
private final boolean noCleaner;
/**
* Default instance which uses leak-detection for direct buffers.
*/
public static final UnpooledByteBufAllocator DEFAULT =
new UnpooledByteBufAllocator(PlatformDependent.directBufferPreferred());
/**
* Create a new instance which uses leak-detection for direct buffers.
*
* @param preferDirect {@code true} if {@link #buffer(int)} should try to allocate a direct buffer rather than
* a heap buffer
*/
public UnpooledByteBufAllocator(boolean preferDirect) {
this(preferDirect, false);
}
/**
* Create a new instance
*
* @param preferDirect {@code true} if {@link #buffer(int)} should try to allocate a direct buffer rather than
* a heap buffer
* @param disableLeakDetector {@code true} if the leak-detection should be disabled completely for this
* allocator. This can be useful if the user just want to depend on the GC to handle
* direct buffers when not explicit released.
*/
public UnpooledByteBufAllocator(boolean preferDirect, boolean disableLeakDetector) {
this(preferDirect, disableLeakDetector, PlatformDependent.useDirectBufferNoCleaner());
}
/**
* Create a new instance
*
* @param preferDirect {@code true} if {@link #buffer(int)} should try to allocate a direct buffer rather than
* a heap buffer
* @param disableLeakDetector {@code true} if the leak-detection should be disabled completely for this
* allocator. This can be useful if the user just want to depend on the GC to handle
* direct buffers when not explicit released.
* @param tryNoCleaner {@code true} if we should try to use {@link PlatformDependent#allocateDirectNoCleaner(int)}
* to allocate direct memory.
*/
public UnpooledByteBufAllocator(boolean preferDirect, boolean disableLeakDetector, boolean tryNoCleaner) {
super(preferDirect);
this.disableLeakDetector = disableLeakDetector;
noCleaner = tryNoCleaner && PlatformDependent.hasUnsafe()
&& PlatformDependent.hasDirectBufferNoCleanerConstructor();
}
@Override
protected ByteBuf newHeapBuffer(int initialCapacity, int maxCapacity) {
return PlatformDependent.hasUnsafe() ?
new InstrumentedUnpooledUnsafeHeapByteBuf(this, initialCapacity, maxCapacity) :
new InstrumentedUnpooledHeapByteBuf(this, initialCapacity, maxCapacity);
}
@Override
protected ByteBuf newDirectBuffer(int initialCapacity, int maxCapacity) {
final ByteBuf buf;
if (PlatformDependent.hasUnsafe()) {
buf = noCleaner ? new InstrumentedUnpooledUnsafeNoCleanerDirectByteBuf(this, initialCapacity, maxCapacity) :
new InstrumentedUnpooledUnsafeDirectByteBuf(this, initialCapacity, maxCapacity);
} else {
buf = new InstrumentedUnpooledDirectByteBuf(this, initialCapacity, maxCapacity);
}
return disableLeakDetector ? buf : toLeakAwareBuffer(buf);
}
@Override
public CompositeByteBuf compositeHeapBuffer(int maxNumComponents) {
CompositeByteBuf buf = new CompositeByteBuf(this, false, maxNumComponents);
return disableLeakDetector ? buf : toLeakAwareBuffer(buf);
}
@Override
public CompositeByteBuf compositeDirectBuffer(int maxNumComponents) {
CompositeByteBuf buf = new CompositeByteBuf(this, true, maxNumComponents);
return disableLeakDetector ? buf : toLeakAwareBuffer(buf);
}
@Override
public boolean isDirectBufferPooled() {
return false;
}
@Override
public ByteBufAllocatorMetric metric() {
return metric;
}
void incrementDirect(int amount) {
metric.directCounter.add(amount);
}
void decrementDirect(int amount) {
metric.directCounter.add(-amount);
}
void incrementHeap(int amount) {
metric.heapCounter.add(amount);
}
void decrementHeap(int amount) {
metric.heapCounter.add(-amount);
}
private static final class InstrumentedUnpooledUnsafeHeapByteBuf extends UnpooledUnsafeHeapByteBuf {
InstrumentedUnpooledUnsafeHeapByteBuf(UnpooledByteBufAllocator alloc, int initialCapacity, int maxCapacity) {
super(alloc, initialCapacity, maxCapacity);
}
@Override
protected byte[] allocateArray(int initialCapacity) {
byte[] bytes = super.allocateArray(initialCapacity);
((UnpooledByteBufAllocator) alloc()).incrementHeap(bytes.length);
return bytes;
}
@Override
protected void freeArray(byte[] array) {
int length = array.length;
super.freeArray(array);
((UnpooledByteBufAllocator) alloc()).decrementHeap(length);
}
}
private static final class InstrumentedUnpooledHeapByteBuf extends UnpooledHeapByteBuf {
InstrumentedUnpooledHeapByteBuf(UnpooledByteBufAllocator alloc, int initialCapacity, int maxCapacity) {
super(alloc, initialCapacity, maxCapacity);
}
@Override
protected byte[] allocateArray(int initialCapacity) {
byte[] bytes = super.allocateArray(initialCapacity);
((UnpooledByteBufAllocator) alloc()).incrementHeap(bytes.length);
return bytes;
}
@Override
protected void freeArray(byte[] array) {
int length = array.length;
super.freeArray(array);
((UnpooledByteBufAllocator) alloc()).decrementHeap(length);
}
}
private static final class InstrumentedUnpooledUnsafeNoCleanerDirectByteBuf
extends UnpooledUnsafeNoCleanerDirectByteBuf {
InstrumentedUnpooledUnsafeNoCleanerDirectByteBuf(
UnpooledByteBufAllocator alloc, int initialCapacity, int maxCapacity) {
super(alloc, initialCapacity, maxCapacity);
}
@Override
protected ByteBuffer allocateDirect(int initialCapacity) {
ByteBuffer buffer = super.allocateDirect(initialCapacity);
((UnpooledByteBufAllocator) alloc()).incrementDirect(buffer.capacity());
return buffer;
}
@Override
ByteBuffer reallocateDirect(ByteBuffer oldBuffer, int initialCapacity) {
int capacity = oldBuffer.capacity();
ByteBuffer buffer = super.reallocateDirect(oldBuffer, initialCapacity);
((UnpooledByteBufAllocator) alloc()).incrementDirect(buffer.capacity() - capacity);
return buffer;
}
@Override
protected void freeDirect(ByteBuffer buffer) {
int capacity = buffer.capacity();
super.freeDirect(buffer);
((UnpooledByteBufAllocator) alloc()).decrementDirect(capacity);
}
}
private static final class InstrumentedUnpooledUnsafeDirectByteBuf extends UnpooledUnsafeDirectByteBuf {
InstrumentedUnpooledUnsafeDirectByteBuf(
UnpooledByteBufAllocator alloc, int initialCapacity, int maxCapacity) {
super(alloc, initialCapacity, maxCapacity);
}
@Override
protected ByteBuffer allocateDirect(int initialCapacity) {
ByteBuffer buffer = super.allocateDirect(initialCapacity);
((UnpooledByteBufAllocator) alloc()).incrementDirect(buffer.capacity());
return buffer;
}
@Override
protected void freeDirect(ByteBuffer buffer) {
int capacity = buffer.capacity();
super.freeDirect(buffer);
((UnpooledByteBufAllocator) alloc()).decrementDirect(capacity);
}
}
private static final class InstrumentedUnpooledDirectByteBuf extends UnpooledDirectByteBuf {
InstrumentedUnpooledDirectByteBuf(
UnpooledByteBufAllocator alloc, int initialCapacity, int maxCapacity) {
super(alloc, initialCapacity, maxCapacity);
}
@Override
protected ByteBuffer allocateDirect(int initialCapacity) {
ByteBuffer buffer = super.allocateDirect(initialCapacity);
((UnpooledByteBufAllocator) alloc()).incrementDirect(buffer.capacity());
return buffer;
}
@Override
protected void freeDirect(ByteBuffer buffer) {
int capacity = buffer.capacity();
super.freeDirect(buffer);
((UnpooledByteBufAllocator) alloc()).decrementDirect(capacity);
}
}
private static final class UnpooledByteBufAllocatorMetric implements ByteBufAllocatorMetric {
final LongCounter directCounter = PlatformDependent.newLongCounter();
final LongCounter heapCounter = PlatformDependent.newLongCounter();
@Override
public long usedHeapMemory() {
return heapCounter.value();
}
@Override
public long usedDirectMemory() {
return directCounter.value();
}
@Override
public String toString() {
return StringUtil.simpleClassName(this) +
"(usedHeapMemory: " + usedHeapMemory() + "; usedDirectMemory: " + usedDirectMemory() + ')';
}
}
}
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