com.barchart.netty.client.pipeline.CapabilitiesRequest.java Source code

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Here is the source code for com.barchart.netty.client.pipeline.CapabilitiesRequest.java

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/**
 * Copyright (C) 2011-2014 Barchart, Inc. <http://www.barchart.com/>
 *
 * All rights reserved. Licensed under the OSI BSD License.
 *
 * http://www.opensource.org/licenses/bsd-license.php
 */
package com.barchart.netty.client.pipeline;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

import java.util.Collections;
import java.util.Set;

import com.barchart.netty.common.messages.Capabilities;
import com.barchart.netty.common.messages.Version;

/**
 * Channel handler that immediately writes a Capabilities message to the server
 * on connect, and expects a Capabilities message response.
 *
 * This handler removes itself after sending the request.
 */
public class CapabilitiesRequest extends ChannelInboundHandlerAdapter {

    @Override
    public void channelActive(final ChannelHandlerContext ctx) throws Exception {

        ctx.writeAndFlush(new Capabilities() {

            @Override
            public Set<String> capabilities() {
                return Collections.emptySet();
            }

            @Override
            public Version version() {
                return null;
            }

            @Override
            public Version minVersion() {
                return null;
            }

        });

        ctx.fireChannelActive();

        ctx.pipeline().remove(this);

    }

}