PoolArena.java — netty Source File

Source Code

/*
 * 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.CleanableDirectBuffer;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.StringUtil;

import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.atomic.LongAdder;
import java.util.concurrent.locks.ReentrantLock;

import static io.netty.buffer.PoolChunk.isSubpage;
import static java.lang.Math.max;

abstract class PoolArena<T> implements PoolArenaMetric {
    private static final boolean HAS_UNSAFE = PlatformDependent.hasUnsafe();

    enum SizeClass {
        Small,
        Normal
    }

    final PooledByteBufAllocator parent;

    final PoolSubpage<T>[] smallSubpagePools;

    private final PoolChunkList<T> q050;
    private final PoolChunkList<T> q025;
    private final PoolChunkList<T> q000;
    private final PoolChunkList<T> qInit;
    private final PoolChunkList<T> q075;
    private final PoolChunkList<T> q100;

    private final List<PoolChunkListMetric> chunkListMetrics;

    // Metrics for allocations and deallocations
    private long allocationsNormal;
    // We need to use the LongCounter here as this is not guarded via synchronized block.
    private final LongAdder allocationsSmall = new LongAdder();
    private final LongAdder allocationsHuge = new LongAdder();
// ... (794 more lines)