DefaultMaxBytesRecvByteBufAllocator.java — netty Source File

Source Code

/*
 * Copyright 2015 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.channel;

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

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.util.UncheckedBooleanSupplier;

import java.util.AbstractMap;
import java.util.Map.Entry;

/**
 * The {@link RecvByteBufAllocator} that yields a buffer size prediction based upon decrementing the value from
 * the max bytes per read.
 */
public class DefaultMaxBytesRecvByteBufAllocator implements MaxBytesRecvByteBufAllocator {
    private volatile int maxBytesPerRead;
    private volatile int maxBytesPerIndividualRead;

    private final class HandleImpl implements ExtendedHandle {
        private int individualReadMax;
        private int bytesToRead;
        private int lastBytesRead;
        private int attemptBytesRead;
        private final UncheckedBooleanSupplier defaultMaybeMoreSupplier = new UncheckedBooleanSupplier() {
            @Override
            public boolean get() {
                return attemptBytesRead == lastBytesRead;
            }
        };

        @Override
        public ByteBuf allocate(ByteBufAllocator alloc) {
            return alloc.ioBuffer(guess());
        }

        @Override
        public int guess() {
            return Math.min(individualReadMax, bytesToRead);
        }

        @Override
        public void reset(ChannelConfig config) {
            bytesToRead = maxBytesPerRead();
            individualReadMax = maxBytesPerIndividualRead();
// ... (136 more lines)