org.wso2.broker.amqp.codec.frames.ChannelOpen Maven / Gradle / Ivy

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/*
 * Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. 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 org.wso2.broker.amqp.codec.frames;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.wso2.broker.amqp.codec.AmqpConnectionHandler;

/**
 * AMQP frame for channel.open
 * Parameter Summary:
 *     1. reserved-1 (ShortString) - deprecated param
 */
public class ChannelOpen extends MethodFrame {
    private static final Logger LOGGER = LoggerFactory.getLogger(ChannelOpen.class);


    public ChannelOpen(int channel) {
        super(channel, (short) 20, (short) 10);
    }

    @Override
    protected long getMethodBodySize() {
        return 1L;
    }

    @Override
    protected void writeMethod(ByteBuf buf) {
        // write deprecated ShortString size as 0
        buf.writeByte(0);
    }

    @Override
    public void handle(ChannelHandlerContext ctx, AmqpConnectionHandler connectionHandler) {
        try {
            int channelId = getChannel();
            connectionHandler.createChannel(channelId);
            ctx.writeAndFlush(new ChannelOpenOk(channelId));
        } catch (Exception e) {
            // TODO we should send an error frame back
            LOGGER.warn("Error while creating channel", e);
        }
    }

    public static AmqMethodBodyFactory getFactory() {
        return (buf, channel, size) -> {
            // read the size of deprecated short string value
            short stringSize = buf.readUnsignedByte();
            buf.skipBytes(stringSize);
            return new ChannelOpen(channel);
        };
    }
}