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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.pulsar.testclient;
import com.beust.jcommander.JCommander;
import com.beust.jcommander.Parameter;
import com.beust.jcommander.ParameterException;
import com.google.common.util.concurrent.RateLimiter;
import io.netty.util.concurrent.DefaultThreadFactory;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Function;
import org.apache.pulsar.client.admin.PulsarAdmin;
import org.apache.pulsar.client.admin.PulsarAdminException;
import org.apache.pulsar.client.api.Consumer;
import org.apache.pulsar.client.api.MessageId;
import org.apache.pulsar.client.api.MessageListener;
import org.apache.pulsar.client.api.Producer;
import org.apache.pulsar.client.api.PulsarClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* LoadSimulationClient is used to simulate client load by maintaining producers and consumers for topics. Instances of
* this class are controlled across a network via LoadSimulationController.
*/
public class LoadSimulationClient {
private final static Logger log = LoggerFactory.getLogger(LoadSimulationClient.class);
// Values for command encodings.
public static final byte CHANGE_COMMAND = 0;
public static final byte STOP_COMMAND = 1;
public static final byte TRADE_COMMAND = 2;
public static final byte CHANGE_GROUP_COMMAND = 3;
public static final byte STOP_GROUP_COMMAND = 4;
public static final byte FIND_COMMAND = 5;
private final ExecutorService executor;
// Map from a message size to a cached byte[] of that size.
private final Map payloadCache;
// Map from a full topic name to the TradeUnit created for that topic.
private final Map topicsToTradeUnits;
// Pulsar admin to create namespaces with.
private final PulsarAdmin admin;
// Pulsar client to create producers and consumers with.
private final PulsarClient client;
private final int port;
// A TradeUnit is a Consumer and Producer pair. The rate of message
// consumption as well as size may be changed at
// any time, and the TradeUnit may also be stopped.
private static class TradeUnit {
Future> consumerFuture;
final AtomicBoolean stop;
final RateLimiter rateLimiter;
// Creating a byte[] for every message is stressful for a client
// machine, so in order to ensure that any
// message size may be sent/changed while reducing object creation, the
// byte[] is wrapped in an AtomicReference.
final AtomicReference payload;
final PulsarClient client;
final String topic;
final Map payloadCache;
public TradeUnit(final TradeConfiguration tradeConf, final PulsarClient client,
final Map payloadCache) throws Exception {
consumerFuture = client.newConsumer()
.topic(tradeConf.topic)
.subscriptionName("Subscriber-" + tradeConf.topic)
.messageListener(ackListener)
.subscribeAsync();
this.payload = new AtomicReference<>();
this.payloadCache = payloadCache;
this.client = client;
topic = tradeConf.topic;
// Add a byte[] of the appropriate size if it is not already present
// in the cache.
this.payload.set(payloadCache.computeIfAbsent(tradeConf.size, byte[]::new));
rateLimiter = RateLimiter.create(tradeConf.rate);
stop = new AtomicBoolean(false);
}
// Change the message rate/size according to the given configuration.
public void change(final TradeConfiguration tradeConf) {
rateLimiter.setRate(tradeConf.rate);
this.payload.set(payloadCache.computeIfAbsent(tradeConf.size, byte[]::new));
}
// Attempt to create a Producer indefinitely. Useful for ensuring
// messages continue to be sent after broker
// restarts occur.
private Producer getNewProducer() throws Exception {
while (true) {
try {
return client.newProducer()
.topic(topic)
.sendTimeout(0, TimeUnit.SECONDS)
.create();
} catch (Exception e) {
Thread.sleep(10000);
}
}
}
private class MutableBoolean {
public volatile boolean value = true;
}
public void start() throws Exception {
Producer producer = getNewProducer();
final Consumer consumer = consumerFuture.get();
while (!stop.get()) {
final MutableBoolean wellnessFlag = new MutableBoolean();
final Function exceptionHandler = e -> {
// Unset the well flag in the case of an exception so we can
// try to get a new Producer.
wellnessFlag.value = false;
return null;
};
while (!stop.get() && wellnessFlag.value) {
producer.sendAsync(payload.get()).exceptionally(exceptionHandler);
rateLimiter.acquire();
}
producer.closeAsync();
if (!stop.get()) {
// The Producer failed due to an exception: attempt to get
// another producer.
producer = getNewProducer();
} else {
// We are finished: close the consumer.
consumer.closeAsync();
}
}
}
}
// JCommander arguments for starting a LoadSimulationClient.
private static class MainArguments {
@Parameter(names = { "-h", "--help" }, description = "Help message", help = true)
boolean help;
@Parameter(names = { "--port" }, description = "Port to listen on for controller", required = true)
public int port;
@Parameter(names = { "--service-url" }, description = "Pulsar Service URL", required = true)
public String serviceURL;
}
// Configuration class for initializing or modifying TradeUnits.
private static class TradeConfiguration {
public byte command;
public String topic;
public double rate;
public int size;
public String tenant;
public String group;
public TradeConfiguration() {
command = -1;
rate = 100;
size = 1024;
}
}
// Handle input sent from a controller.
private void handle(final Socket socket) throws Exception {
final DataInputStream inputStream = new DataInputStream(socket.getInputStream());
int command;
while ((command = inputStream.read()) != -1) {
handle((byte) command, inputStream, new DataOutputStream(socket.getOutputStream()));
}
}
// Decode TradeConfiguration fields common for topic creation and
// modification.
private void decodeProducerOptions(final TradeConfiguration tradeConf, final DataInputStream inputStream)
throws Exception {
tradeConf.topic = inputStream.readUTF();
tradeConf.size = inputStream.readInt();
tradeConf.rate = inputStream.readDouble();
}
// Decode TradeConfiguration fields common for group commands.
private void decodeGroupOptions(final TradeConfiguration tradeConf, final DataInputStream inputStream)
throws Exception {
tradeConf.tenant = inputStream.readUTF();
tradeConf.group = inputStream.readUTF();
}
// Handle a command sent from a controller.
private void handle(final byte command, final DataInputStream inputStream, final DataOutputStream outputStream)
throws Exception {
final TradeConfiguration tradeConf = new TradeConfiguration();
tradeConf.command = command;
switch (command) {
case CHANGE_COMMAND:
// Change the topic's settings if it exists.
decodeProducerOptions(tradeConf, inputStream);
if (topicsToTradeUnits.containsKey(tradeConf.topic)) {
topicsToTradeUnits.get(tradeConf.topic).change(tradeConf);
}
break;
case STOP_COMMAND:
// Stop the topic if it exists.
tradeConf.topic = inputStream.readUTF();
if (topicsToTradeUnits.containsKey(tradeConf.topic)) {
topicsToTradeUnits.get(tradeConf.topic).stop.set(true);
}
break;
case TRADE_COMMAND:
// Create the topic. It is assumed that the topic does not already exist.
decodeProducerOptions(tradeConf, inputStream);
final TradeUnit tradeUnit = new TradeUnit(tradeConf, client, payloadCache);
topicsToTradeUnits.put(tradeConf.topic, tradeUnit);
executor.submit(() -> {
try {
final String topic = tradeConf.topic;
final String namespace = topic.substring("persistent://".length(), topic.lastIndexOf('/'));
try {
admin.namespaces().createNamespace(namespace);
} catch (PulsarAdminException.ConflictException e) {
// Ignore, already created namespace.
}
tradeUnit.start();
} catch (Exception ex) {
throw new RuntimeException(ex);
}
});
break;
case CHANGE_GROUP_COMMAND:
// Change the settings of all topics belonging to a group.
decodeGroupOptions(tradeConf, inputStream);
tradeConf.size = inputStream.readInt();
tradeConf.rate = inputStream.readDouble();
// See if a topic belongs to this tenant and group using this regex.
final String groupRegex = ".*://" + tradeConf.tenant + "/.*/" + tradeConf.group + "-.*/.*";
for (Map.Entry entry : topicsToTradeUnits.entrySet()) {
final String topic = entry.getKey();
final TradeUnit unit = entry.getValue();
if (topic.matches(groupRegex)) {
unit.change(tradeConf);
}
}
break;
case STOP_GROUP_COMMAND:
// Stop all topics belonging to a group.
decodeGroupOptions(tradeConf, inputStream);
// See if a topic belongs to this tenant and group using this regex.
final String regex = ".*://" + tradeConf.tenant + "/.*/" + tradeConf.group + "-.*/.*";
for (Map.Entry entry : topicsToTradeUnits.entrySet()) {
final String topic = entry.getKey();
final TradeUnit unit = entry.getValue();
if (topic.matches(regex)) {
unit.stop.set(true);
}
}
break;
case FIND_COMMAND:
// Write a single boolean indicating if the topic was found.
outputStream.writeBoolean(topicsToTradeUnits.containsKey(inputStream.readUTF()));
outputStream.flush();
break;
default:
throw new IllegalArgumentException("Unrecognized command code received: " + command);
}
}
// Make listener as lightweight as possible.
private static final MessageListener ackListener = Consumer::acknowledgeAsync;
/**
* Create a LoadSimulationClient with the given JCommander arguments.
*
* @param arguments
* Arguments to configure this from.
*/
public LoadSimulationClient(final MainArguments arguments) throws Exception {
payloadCache = new ConcurrentHashMap<>();
topicsToTradeUnits = new ConcurrentHashMap<>();
admin = PulsarAdmin.builder()
.serviceHttpUrl(arguments.serviceURL)
.build();
client = PulsarClient.builder()
.serviceUrl(arguments.serviceURL)
.connectionsPerBroker(4)
.ioThreads(Runtime.getRuntime().availableProcessors())
.statsInterval(0, TimeUnit.SECONDS)
.build();
port = arguments.port;
executor = Executors.newCachedThreadPool(new DefaultThreadFactory("test-client"));
}
/**
* Start a client with command line arguments.
*
* @param args
* Command line arguments to pass in.
*/
public static void main(String[] args) throws Exception {
final MainArguments mainArguments = new MainArguments();
final JCommander jc = new JCommander(mainArguments);
jc.setProgramName("pulsar-perf simulation-client");
try {
jc.parse(args);
} catch (ParameterException e) {
System.out.println(e.getMessage());
jc.usage();
System.exit(-1);
}
(new LoadSimulationClient(mainArguments)).run();
}
/**
* Start listening for controller commands to create producers and consumers.
*/
public void run() throws Exception {
final ServerSocket serverSocket = new ServerSocket(port);
while (true) {
// Technically, two controllers can be connected simultaneously, but
// non-sequential handling of commands
// has not been tested or considered and is not recommended.
log.info("Listening for controller command...");
final Socket socket = serverSocket.accept();
log.info("Connected to {}", socket.getInetAddress().getHostName());
executor.submit(() -> {
try {
handle(socket);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
});
}
}
}
