JZlibEncoder.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.handler.codec.compression;

import com.jcraft.jzlib.Deflater;
import com.jcraft.jzlib.JZlib;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.PromiseNotifier;
import io.netty.util.internal.EmptyArrays;
import io.netty.util.internal.ObjectUtil;

import java.util.concurrent.TimeUnit;

/**
 * Compresses a {@link ByteBuf} using the deflate algorithm.
 */
public class JZlibEncoder extends ZlibEncoder {

    private final int wrapperOverhead;
    private final Deflater z = new Deflater();
    private volatile boolean finished;
    private volatile ChannelHandlerContext ctx;

    private static final int THREAD_POOL_DELAY_SECONDS = 10;

    /**
     * Creates a new zlib encoder with the default compression level ({@code 6}),
     * default window bits ({@code 15}), default memory level ({@code 8}),
     * and the default wrapper ({@link ZlibWrapper#ZLIB}).
     *
     * @throws CompressionException if failed to initialize zlib
     */
    public JZlibEncoder() {
        this(6);
    }

    /**
     * Creates a new zlib encoder with the specified {@code compressionLevel},
     * default window bits ({@code 15}), default memory level ({@code 8}),
     * and the default wrapper ({@link ZlibWrapper#ZLIB}).
// ... (342 more lines)