/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
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*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
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package org.smallmind.phalanx.wire.amqp.rabbitmq;
import java.io.IOException;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.TransferQueue;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import org.smallmind.instrument.config.MetricConfiguration;
import org.smallmind.instrument.config.MetricConfigurationProvider;
import org.smallmind.nutsnbolts.util.SnowflakeId;
import org.smallmind.phalanx.wire.ResponseTransport;
import org.smallmind.phalanx.wire.SignalCodec;
import org.smallmind.phalanx.wire.TransportException;
import org.smallmind.phalanx.wire.TransportState;
import org.smallmind.phalanx.wire.WireInvocationCircuit;
import org.smallmind.phalanx.wire.WiredService;
import org.smallmind.phalanx.worker.WorkManager;
import org.smallmind.phalanx.worker.WorkerFactory;
public class RabbitMQResponseTransport extends WorkManager<InvocationWorker, RabbitMQMessage> implements MetricConfigurationProvider, WorkerFactory<InvocationWorker, RabbitMQMessage>, ResponseTransport {
private final AtomicBoolean closed = new AtomicBoolean(false);
private final AtomicReference<TransportState> transportStateRef = new AtomicReference<>(TransportState.PLAYING);
private final WireInvocationCircuit invocationCircuit = new WireInvocationCircuit();
private final SignalCodec signalCodec;
private final ConcurrentLinkedQueue<ResponseMessageRouter> responseQueue;
private final ResponseMessageRouter[] responseMessageRouters;
private final String instanceId = SnowflakeId.newInstance().generateDottedString();
public RabbitMQResponseTransport (MetricConfiguration metricConfiguration, RabbitMQConnector rabbitMQConnector, NameConfiguration nameConfiguration, Class<InvocationWorker> workerClass, SignalCodec signalCodec, String serviceGroup, int clusterSize, int concurrencyLimit, int messageTTLSeconds)
throws IOException, InterruptedException, TimeoutException {
super(metricConfiguration, workerClass, concurrencyLimit);
int routerIndex = 0;
this.signalCodec = signalCodec;
responseMessageRouters = new ResponseMessageRouter[clusterSize];
for (int index = 0; index < responseMessageRouters.length; index++) {
responseMessageRouters[index] = new ResponseMessageRouter(rabbitMQConnector, nameConfiguration, this, signalCodec, serviceGroup, instanceId, index, messageTTLSeconds);
responseMessageRouters[index].initialize();
}
responseQueue = new ConcurrentLinkedQueue<>();
for (int index = 0; index < Math.max(clusterSize, concurrencyLimit); index++) {
responseQueue.add(responseMessageRouters[routerIndex]);
if (++routerIndex == responseMessageRouters.length) {
routerIndex = 0;
}
}
startUp(this);
}
@Override
public String getInstanceId () {
return instanceId;
}
@Override
public String register (Class<?> serviceInterface, WiredService targetService) throws Exception {
invocationCircuit.register(serviceInterface, targetService);
return instanceId;
}
@Override
public InvocationWorker createWorker (MetricConfiguration metricConfiguration, TransferQueue<RabbitMQMessage> transferQueue) {
return new InvocationWorker(metricConfiguration, transferQueue, this, invocationCircuit, signalCodec);
}
@Override
public TransportState getState () {
return transportStateRef.get();
}
@Override
public void play ()
throws Exception {
synchronized (transportStateRef) {
if (transportStateRef.compareAndSet(TransportState.PAUSED, TransportState.PLAYING)) {
for (ResponseMessageRouter responseMessageRouter : responseMessageRouters) {
responseMessageRouter.play();
}
}
}
}
@Override
public void pause ()
throws Exception {
synchronized (transportStateRef) {
if (transportStateRef.compareAndSet(TransportState.PLAYING, TransportState.PAUSED)) {
for (ResponseMessageRouter responseMessageRouter : responseMessageRouters) {
responseMessageRouter.pause();
}
}
}
}
@Override
public void transmit (String callerId, String correlationId, boolean error, String nativeType, Object result) throws Throwable {
ResponseMessageRouter responseMessageRouter;
if ((responseMessageRouter = responseQueue.poll()) == null) {
throw new TransportException("Unable to take a ResponseMessageRouter, which should never happen - please contact your system administrator");
}
responseMessageRouter.publish(callerId, correlationId, error, nativeType, result);
responseQueue.add(responseMessageRouter);
}
@Override
public void close ()
throws IOException, InterruptedException, TimeoutException {
if (closed.compareAndSet(false, true)) {
synchronized (transportStateRef) {
transportStateRef.set(TransportState.CLOSED);
for (ResponseMessageRouter responseMessageRouter : responseMessageRouters) {
responseMessageRouter.close();
}
shutDown();
}
}
}
}