io.netty.handler.codec.http.websocketx.WebSocketFrameAggregator Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2013 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.http.websocketx;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.MessageAggregator;
import io.netty.handler.codec.TooLongFrameException;

/**
 * Handler that aggregate fragmented WebSocketFrame's.
 *
 * Be aware if PING/PONG/CLOSE frames are send in the middle of a fragmented {@link WebSocketFrame} they will
 * just get forwarded to the next handler in the pipeline.
 */
public class WebSocketFrameAggregator
        extends MessageAggregator {

    /**
     * Creates a new instance
     *
     * @param maxContentLength If the size of the aggregated frame exceeds this value,
     *                         a {@link TooLongFrameException} is thrown.
     */
    public WebSocketFrameAggregator(int maxContentLength) {
        super(maxContentLength);
    }

    @Override
    protected boolean isStartMessage(WebSocketFrame msg) throws Exception {
        return msg instanceof TextWebSocketFrame || msg instanceof BinaryWebSocketFrame;
    }

    @Override
    protected boolean isContentMessage(WebSocketFrame msg) throws Exception {
        return msg instanceof ContinuationWebSocketFrame;
    }

    @Override
    protected boolean isLastContentMessage(ContinuationWebSocketFrame msg) throws Exception {
        return isContentMessage(msg) && msg.isFinalFragment();
    }

    @Override
    protected boolean isAggregated(WebSocketFrame msg) throws Exception {
        if (msg.isFinalFragment()) {
            return !isContentMessage(msg);
        }

        return !isStartMessage(msg) && !isContentMessage(msg);
    }

    @Override
    protected boolean isContentLengthInvalid(WebSocketFrame start, int maxContentLength) {
        return false;
    }

    @Override
    protected Object newContinueResponse(WebSocketFrame start, int maxContentLength, ChannelPipeline pipeline) {
        return null;
    }

    @Override
    protected boolean closeAfterContinueResponse(Object msg) throws Exception {
        throw new UnsupportedOperationException();
    }

    @Override
    protected boolean ignoreContentAfterContinueResponse(Object msg) throws Exception {
        throw new UnsupportedOperationException();
    }

    @Override
    protected WebSocketFrame beginAggregation(WebSocketFrame start, ByteBuf content) throws Exception {
        if (start instanceof TextWebSocketFrame) {
            return new TextWebSocketFrame(true, start.rsv(), content);
        }

        if (start instanceof BinaryWebSocketFrame) {
            return new BinaryWebSocketFrame(true, start.rsv(), content);
        }

        // Should not reach here.
        throw new Error();
    }
}