/**
* 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 example;
import org.fusesource.hawtbuf.AsciiBuffer;
import org.fusesource.hawtbuf.Buffer;
import org.fusesource.hawtbuf.UTF8Buffer;
import org.fusesource.mqtt.client.Future;
import org.fusesource.mqtt.client.FutureConnection;
import org.fusesource.mqtt.client.MQTT;
import org.fusesource.mqtt.client.QoS;
import java.util.LinkedList;
/**
* Uses a Future based API to MQTT.
*/
class Publisher {
public static void main(String []args) throws Exception {
String user = env("STOMP_USER", "admin");
String password = env("STOMP_PASSWORD", "password");
String host = env("STOMP_HOST", "localhost");
int port = Integer.parseInt(env("STOMP_PORT", "61613"));
final String destination = arg(args, 0, "/topic/event");
int messages = 10000;
int size = 256;
String DATA = "abcdefghijklmnopqrstuvwxyz";
String body = "";
for( int i=0; i < size; i ++) {
body += DATA.charAt(i%DATA.length());
}
Buffer msg = new AsciiBuffer(body);
MQTT mqtt = new MQTT();
mqtt.setHost(host, port);
mqtt.setUserName(user);
mqtt.setPassword(password);
FutureConnection connection = mqtt.futureConnection();
connection.connect().await();
final LinkedList<Future<Void>> queue = new LinkedList<Future<Void>>();
UTF8Buffer topic = new UTF8Buffer(destination);
for( int i=1; i <= messages; i ++) {
// Send the publish without waiting for it to complete. This allows us
// to send multiple message without blocking..
queue.add(connection.publish(topic, msg, QoS.AT_LEAST_ONCE, false));
// Eventually we start waiting for old publish futures to complete
// so that we don't create a large in memory buffer of outgoing message.s
if( queue.size() >= 1000 ) {
queue.removeFirst().await();
}
}
queue.add(connection.publish(topic, new AsciiBuffer("SHUTDOWN"), QoS.AT_LEAST_ONCE, false));
while( !queue.isEmpty() ) {
queue.removeFirst().await();
}
connection.disconnect().await();
System.exit(0);
}
private static String env(String key, String defaultValue) {
String rc = System.getenv(key);
if( rc== null )
return defaultValue;
return rc;
}
private static String arg(String []args, int index, String defaultValue) {
if( index < args.length )
return args[index];
else
return defaultValue;
}
}