io.netty.handler.codec.sctp.SctpInboundByteStreamHandler 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 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:
 *
 * 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 io.netty.handler.codec.sctp;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.sctp.SctpMessage;
import io.netty.handler.codec.CodecException;
import io.netty.handler.codec.MessageToMessageDecoder;

import java.util.List;

/**
 * A ChannelHandler which receives {@link SctpMessage}s which belong to a application protocol form a specific
 * SCTP Stream  and decode it as {@link ByteBuf}.
 */
public class SctpInboundByteStreamHandler extends MessageToMessageDecoder {
    private final int protocolIdentifier;
    private final int streamIdentifier;

    /**
     * @param streamIdentifier   accepted stream number, this should be >=0 or <= max stream number of the association.
     * @param protocolIdentifier supported application protocol.
     */
    public SctpInboundByteStreamHandler(int protocolIdentifier, int streamIdentifier) {
        this.protocolIdentifier = protocolIdentifier;
        this.streamIdentifier = streamIdentifier;
    }

    @Override
    public final boolean acceptInboundMessage(Object msg) throws Exception {
        if (super.acceptInboundMessage(msg)) {
            return acceptInboundMessage((SctpMessage) msg);
        }
        return false;
    }

    protected boolean acceptInboundMessage(SctpMessage msg) {
        return msg.protocolIdentifier() == protocolIdentifier && msg.streamIdentifier() == streamIdentifier;
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, SctpMessage msg, List