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Efficient, scalable, and flexible Java implementation of the Short Messaging Peer to Peer Protocol (SMPP)
There is a newer version: 5.1.0-113
package com.cloudhopper.smpp.simulator;

/*
 * #%L
 * ch-smpp
 * %%
 * Copyright (C) 2009 - 2015 Cloudhopper by Twitter
 * %%
 * 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.
 * #L%
 */

import com.cloudhopper.smpp.pdu.Pdu;
import com.cloudhopper.smpp.transcoder.PduTranscoder;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;
import java.util.concurrent.*;

/**
 * Basically turns the event-driven handler into a "queued" handler by queuing
 * received PDUs and exceptions thrown.  A calling thread can then "poll" for
 * these events.  Also, the responses can be scheduled and queued ahead of time.
 * The next event that matches it will automatically write it back.
 * 
 * @author joelauer (twitter: @jjlauer or http://twitter.com/jjlauer)
 */
public class SmppSimulatorSessionHandler extends ByteToMessageDecoder {
    private static final Logger logger = LoggerFactory.getLogger(SmppSimulatorSessionHandler.class);

    private final Channel channel;
    private final PduTranscoder transcoder;
    private final BlockingQueue pduQueue;
    private final BlockingQueue exceptionQueue;
    private final BlockingDeque writePduQueue;

    private SmppSimulatorPduProcessor pduProcessor;

    public SmppSimulatorSessionHandler(Channel channel, PduTranscoder transcoder) {
        this.channel = channel;
        this.transcoder = transcoder;
        this.pduQueue = new LinkedBlockingQueue();
        this.exceptionQueue = new LinkedBlockingQueue();
        this.writePduQueue = new LinkedBlockingDeque();
    }

    public SmppSimulatorPduProcessor getPduProcessor() {
        return this.pduProcessor;
    }

    public void setPduProcessor(SmppSimulatorPduProcessor pduProcessor) {
        this.pduProcessor = pduProcessor;
    }

    public Channel getChannel() {
        return this.channel;
    }

    public PduTranscoder getTranscoder() {
        return this.transcoder;
    }

    public BlockingQueue getPduQueue() {
        return this.pduQueue;
    }

    public void addPduToWriteOnNextPduReceived(Pdu pdu) {
        this.writePduQueue.add(pdu);
    }

    public Pdu pollNextPdu(long timeoutInMillis) throws InterruptedException {
        return this.pduQueue.poll(timeoutInMillis, TimeUnit.MILLISECONDS);
    }

    public BlockingQueue getThrowableQueue() {
        return this.exceptionQueue;
    }

    public Throwable pollNextThrowable(long timeoutInMillis) throws InterruptedException {
        return this.exceptionQueue.poll(timeoutInMillis, TimeUnit.MILLISECONDS);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        logger.info("Received new throwable on channel {}", channel.toString());
        this.exceptionQueue.add(cause);
    }

    public void sendPdu(Pdu pdu) throws Exception {
        logger.info("Sending on channel {} PDU: {}", channel.toString(), pdu);
        ByteBuf writeBuffer = this.transcoder.encode(pdu);
        channel.writeAndFlush(writeBuffer).await();
    }

    // @Override
    // protected Object decode(ChannelHandlerContext ctx, Channel channel, ByteBuf buffer) throws Exception {
    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf buffer, List