CodecOutputList.java — netty Source File

Source Code

/*
 * Copyright 2016 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.handler.codec;

import io.netty.util.concurrent.FastThreadLocal;
import io.netty.util.internal.MathUtil;

import java.util.AbstractList;
import java.util.RandomAccess;

import static io.netty.util.internal.ObjectUtil.checkNotNull;

/**
 * Special {@link AbstractList} implementation which is used within our codec base classes.
 */
final class CodecOutputList extends AbstractList<Object> implements RandomAccess {

    private static final CodecOutputListRecycler NOOP_RECYCLER = new CodecOutputListRecycler() {
        @Override
        public void recycle(CodecOutputList object) {
            // drop on the floor and let the GC handle it.
        }
    };

    private static final FastThreadLocal<CodecOutputLists> CODEC_OUTPUT_LISTS_POOL =
            new FastThreadLocal<CodecOutputLists>() {
                @Override
                protected CodecOutputLists initialValue() throws Exception {
                    // 16 CodecOutputList per Thread are cached.
                    return new CodecOutputLists(16);
                }
            };

    private interface CodecOutputListRecycler {
        void recycle(CodecOutputList codecOutputList);
    }

    private static final class CodecOutputLists implements CodecOutputListRecycler {
        private final CodecOutputList[] elements;
        private final int mask;

        private int currentIdx;
        private int count;

        CodecOutputLists(int numElements) {
            elements = new CodecOutputList[MathUtil.safeFindNextPositivePowerOfTwo(numElements)];
            for (int i = 0; i < elements.length; ++i) {
// ... (177 more lines)