org.aaron.sms.protocol.SMSProtocolChannelInitializer.java Source code

Introduction

Here is the source code for org.aaron.sms.protocol.SMSProtocolChannelInitializer.java

Source

package org.aaron.sms.protocol;

/*
 * #%L
 * Simple Message Service Protocol
 * %%
 * Copyright (C) 2013 - 2014 Aaron Riekenberg
 * %%
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * #L%
 */

import static com.google.common.base.Preconditions.checkNotNull;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;

import java.util.function.Supplier;

import com.google.protobuf.MessageLite;

public class SMSProtocolChannelInitializer extends ChannelInitializer<Channel> {

    private final Supplier<? extends ChannelHandler> handlerSupplier;

    private final MessageLite messagePrototype;

    public SMSProtocolChannelInitializer(Supplier<? extends ChannelHandler> handlerSupplier,
            MessageLite messagePrototype) {
        this.handlerSupplier = checkNotNull(handlerSupplier, "handlerSupplier is null");
        this.messagePrototype = checkNotNull(messagePrototype, "messagePrototype is null");
    }

    @Override
    protected void initChannel(Channel ch) throws Exception {
        final ChannelPipeline p = ch.pipeline();
        p.addLast("logger", new LoggingHandler(LogLevel.DEBUG));

        p.addLast("frameEncoder", new LengthFieldPrepender(SMSProtocolConstants.MESSAGE_HEADER_LENGTH_BYTES));

        p.addLast("frameDecoder",
                new LengthFieldBasedFrameDecoder(SMSProtocolConstants.MAX_MESSAGE_LENGTH_BYTES, 0,
                        SMSProtocolConstants.MESSAGE_HEADER_LENGTH_BYTES, 0,
                        SMSProtocolConstants.MESSAGE_HEADER_LENGTH_BYTES));

        p.addLast("protobufEncoder", new ProtobufEncoder());

        p.addLast("protobufDecoder", new ProtobufDecoder(messagePrototype));

        p.addLast("customHandler", handlerSupplier.get());
    }
}