com.spotify.netty.handler.codec.zmtp.ZMTPFramingDecoder.java Source code

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Here is the source code for com.spotify.netty.handler.codec.zmtp.ZMTPFramingDecoder.java

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/*
 * Copyright (c) 2012-2013 Spotify AB
 *
 * Licensed 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
 *
 * http://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 com.spotify.netty.handler.codec.zmtp;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;

import java.util.List;

/**
 * Netty FrameDecoder for zmtp protocol
 * <p/>
 * Decodes ZMTP frames into a ZMTPMessage - will return a ZMTPMessage as a message event
 */
class ZMTPFramingDecoder extends ByteToMessageDecoder {

    private final ZMTPMessageParser parser;
    private final ZMTPSession session;

    /**
     * Creates a new decoder
     */
    public ZMTPFramingDecoder(final ZMTPSession session) {
        this.parser = new ZMTPMessageParser(session.isEnveloped(), session.getSizeLimit(),
                session.getActualVersion());
        this.session = session;
    }

    /**
     * Responsible for decoding incoming data to zmtp frames
     */
    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
        // Parse incoming frames
        final ZMTPParsedMessage msg = parser.parse(in);
        if (msg != null) {
            out.add(new ZMTPIncomingMessage(session, msg.getMessage(), msg.isTruncated(), msg.getByteSize()));
        }
    }
}