Motivation: We need to update to a new checkstyle plugin to allow the usage of lambdas. Modifications: - Update to new plugin version. - Fix checkstyle problems. Result: Be able to use checkstyle plugin which supports new Java syntax.
145 lines
5.3 KiB
Java
145 lines
5.3 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.http.websocketx.extensions.compression;
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import static io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateDecoder.*;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.CompositeByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.embedded.EmbeddedChannel;
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import io.netty.handler.codec.CodecException;
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import io.netty.handler.codec.compression.ZlibCodecFactory;
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import io.netty.handler.codec.compression.ZlibWrapper;
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import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.ContinuationWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.WebSocketFrame;
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import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionEncoder;
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import java.util.List;
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/**
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* Deflate implementation of a payload compressor for
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* <tt>io.netty.handler.codec.http.websocketx.WebSocketFrame</tt>.
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*/
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abstract class DeflateEncoder extends WebSocketExtensionEncoder {
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private final int compressionLevel;
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private final int windowSize;
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private final boolean noContext;
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private EmbeddedChannel encoder;
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/**
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* Constructor
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* @param compressionLevel compression level of the compressor.
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* @param windowSize maximum size of the window compressor buffer.
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* @param noContext true to disable context takeover.
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*/
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DeflateEncoder(int compressionLevel, int windowSize, boolean noContext) {
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this.compressionLevel = compressionLevel;
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this.windowSize = windowSize;
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this.noContext = noContext;
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}
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/**
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* @param msg the current frame.
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* @return the rsv bits to set in the compressed frame.
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*/
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protected abstract int rsv(WebSocketFrame msg);
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/**
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* @param msg the current frame.
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* @return true if compressed payload tail needs to be removed.
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*/
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protected abstract boolean removeFrameTail(WebSocketFrame msg);
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@Override
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protected void encode(ChannelHandlerContext ctx, WebSocketFrame msg,
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List<Object> out) throws Exception {
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if (encoder == null) {
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encoder = new EmbeddedChannel(ZlibCodecFactory.newZlibEncoder(
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ZlibWrapper.NONE, compressionLevel, windowSize, 8));
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}
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encoder.writeOutbound(msg.content().retain());
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CompositeByteBuf fullCompressedContent = ctx.alloc().compositeBuffer();
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for (;;) {
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ByteBuf partCompressedContent = encoder.readOutbound();
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if (partCompressedContent == null) {
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break;
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}
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if (!partCompressedContent.isReadable()) {
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partCompressedContent.release();
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continue;
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}
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fullCompressedContent.addComponent(true, partCompressedContent);
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}
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if (fullCompressedContent.numComponents() <= 0) {
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fullCompressedContent.release();
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throw new CodecException("cannot read compressed buffer");
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}
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if (msg.isFinalFragment() && noContext) {
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cleanup();
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}
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ByteBuf compressedContent;
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if (removeFrameTail(msg)) {
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int realLength = fullCompressedContent.readableBytes() - FRAME_TAIL.length;
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compressedContent = fullCompressedContent.slice(0, realLength);
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} else {
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compressedContent = fullCompressedContent;
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}
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WebSocketFrame outMsg;
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if (msg instanceof TextWebSocketFrame) {
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outMsg = new TextWebSocketFrame(msg.isFinalFragment(), rsv(msg), compressedContent);
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} else if (msg instanceof BinaryWebSocketFrame) {
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outMsg = new BinaryWebSocketFrame(msg.isFinalFragment(), rsv(msg), compressedContent);
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} else if (msg instanceof ContinuationWebSocketFrame) {
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outMsg = new ContinuationWebSocketFrame(msg.isFinalFragment(), rsv(msg), compressedContent);
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} else {
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throw new CodecException("unexpected frame type: " + msg.getClass().getName());
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}
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out.add(outMsg);
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}
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@Override
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public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
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cleanup();
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super.handlerRemoved(ctx);
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}
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private void cleanup() {
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if (encoder != null) {
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// Clean-up the previous encoder if not cleaned up correctly.
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if (encoder.finish()) {
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for (;;) {
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ByteBuf buf = encoder.readOutbound();
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if (buf == null) {
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break;
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}
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// Release the buffer
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buf.release();
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}
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}
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encoder = null;
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}
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}
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}
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