Java tutorial
/* * Druid - a distributed column store. * Copyright 2012 - 2015 Metamarkets Group Inc. * * 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. */ package io.druid.examples.rabbitmq; import com.rabbitmq.client.Channel; import com.rabbitmq.client.Connection; import com.rabbitmq.client.ConnectionFactory; import org.apache.commons.cli.BasicParser; import org.apache.commons.cli.CommandLine; import org.apache.commons.cli.HelpFormatter; import org.apache.commons.cli.Option; import org.apache.commons.cli.OptionBuilder; import org.apache.commons.cli.Options; import org.apache.commons.cli.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Comparator; import java.util.Date; import java.util.List; import java.util.Random; /** * */ public class RabbitMQProducerMain { public static void main(String[] args) throws Exception { // We use a List to keep track of option insertion order. See below. final List<Option> optionList = new ArrayList<Option>(); optionList.add(OptionBuilder.withLongOpt("help").withDescription("display this help message").create("h")); optionList.add(OptionBuilder.withLongOpt("hostname").hasArg() .withDescription("the hostname of the AMQP broker [defaults to AMQP library default]").create("b")); optionList.add(OptionBuilder.withLongOpt("port").hasArg() .withDescription("the port of the AMQP broker [defaults to AMQP library default]").create("n")); optionList.add(OptionBuilder.withLongOpt("username").hasArg() .withDescription("username to connect to the AMQP broker [defaults to AMQP library default]") .create("u")); optionList.add(OptionBuilder.withLongOpt("password").hasArg() .withDescription("password to connect to the AMQP broker [defaults to AMQP library default]") .create("p")); optionList.add(OptionBuilder.withLongOpt("vhost").hasArg() .withDescription("name of virtual host on the AMQP broker [defaults to AMQP library default]") .create("v")); optionList.add(OptionBuilder.withLongOpt("exchange").isRequired().hasArg() .withDescription("name of the AMQP exchange [required - no default]").create("e")); optionList.add(OptionBuilder.withLongOpt("key").hasArg() .withDescription("the routing key to use when sending messages [default: 'default.routing.key']") .create("k")); optionList.add(OptionBuilder.withLongOpt("type").hasArg() .withDescription("the type of exchange to create [default: 'topic']").create("t")); optionList.add(OptionBuilder.withLongOpt("durable") .withDescription("if set, a durable exchange will be declared [default: not set]").create("d")); optionList.add(OptionBuilder.withLongOpt("autodelete") .withDescription("if set, an auto-delete exchange will be declared [default: not set]") .create("a")); optionList.add(OptionBuilder.withLongOpt("single") .withDescription("if set, only a single message will be sent [default: not set]").create("s")); optionList.add(OptionBuilder.withLongOpt("start").hasArg() .withDescription("time to use to start sending messages from [default: 2010-01-01T00:00:00]") .create()); optionList.add(OptionBuilder.withLongOpt("stop").hasArg().withDescription( "time to use to send messages until (format: '2013-07-18T23:45:59') [default: current time]") .create()); optionList.add(OptionBuilder.withLongOpt("interval").hasArg() .withDescription("the interval to add to the timestamp between messages in seconds [default: 10]") .create()); optionList.add(OptionBuilder.withLongOpt("delay").hasArg() .withDescription("the delay between sending messages in milliseconds [default: 100]").create()); // An extremely silly hack to maintain the above order in the help formatting. HelpFormatter formatter = new HelpFormatter(); // Add a comparator to the HelpFormatter using the ArrayList above to sort by insertion order. formatter.setOptionComparator(new Comparator() { @Override public int compare(Object o1, Object o2) { // I know this isn't fast, but who cares! The list is short. return optionList.indexOf(o1) - optionList.indexOf(o2); } }); // Now we can add all the options to an Options instance. This is dumb! Options options = new Options(); for (Option option : optionList) { options.addOption(option); } CommandLine cmd = null; try { cmd = new BasicParser().parse(options, args); } catch (ParseException e) { formatter.printHelp("RabbitMQProducerMain", e.getMessage(), options, null); System.exit(1); } if (cmd.hasOption("h")) { formatter.printHelp("RabbitMQProducerMain", options); System.exit(2); } ConnectionFactory factory = new ConnectionFactory(); if (cmd.hasOption("b")) { factory.setHost(cmd.getOptionValue("b")); } if (cmd.hasOption("u")) { factory.setUsername(cmd.getOptionValue("u")); } if (cmd.hasOption("p")) { factory.setPassword(cmd.getOptionValue("p")); } if (cmd.hasOption("v")) { factory.setVirtualHost(cmd.getOptionValue("v")); } if (cmd.hasOption("n")) { factory.setPort(Integer.parseInt(cmd.getOptionValue("n"))); } String exchange = cmd.getOptionValue("e"); String routingKey = "default.routing.key"; if (cmd.hasOption("k")) { routingKey = cmd.getOptionValue("k"); } boolean durable = cmd.hasOption("d"); boolean autoDelete = cmd.hasOption("a"); String type = cmd.getOptionValue("t", "topic"); boolean single = cmd.hasOption("single"); int interval = Integer.parseInt(cmd.getOptionValue("interval", "10")); int delay = Integer.parseInt(cmd.getOptionValue("delay", "100")); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss"); Date stop = sdf.parse(cmd.getOptionValue("stop", sdf.format(new Date()))); Random r = new Random(); Calendar timer = Calendar.getInstance(); timer.setTime(sdf.parse(cmd.getOptionValue("start", "2010-01-01T00:00:00"))); String msg_template = "{\"utcdt\": \"%s\", \"wp\": %d, \"gender\": \"%s\", \"age\": %d}"; Connection connection = factory.newConnection(); Channel channel = connection.createChannel(); channel.exchangeDeclare(exchange, type, durable, autoDelete, null); do { int wp = (10 + r.nextInt(90)) * 100; String gender = r.nextBoolean() ? "male" : "female"; int age = 20 + r.nextInt(70); String line = String.format(msg_template, sdf.format(timer.getTime()), wp, gender, age); channel.basicPublish(exchange, routingKey, null, line.getBytes()); System.out.println("Sent message: " + line); timer.add(Calendar.SECOND, interval); Thread.sleep(delay); } while ((!single && stop.after(timer.getTime()))); connection.close(); } }