ClientSubscribe.java

/*
 *   Copyright (c) 2013 Mike Heath.  All rights reserved.
 *
 *   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 cloudeventbus.cli;

import cloudeventbus.client.Connector;
import cloudeventbus.client.EventBus;
import cloudeventbus.client.Message;
import cloudeventbus.client.MessageHandler;
import com.beust.jcommander.JCommander;
import com.beust.jcommander.Parameter;
import com.beust.jcommander.ParameterException;

import java.util.List;

/**
 * @author Mike Heath <elcapo@gmail.com>
 */
public class ClientSubscribe {

	public static void main(String[] args) throws Exception {
		final JCommander commander = new JCommander();

		final Options options = new Options();
		commander.addObject(options);

		commander.setProgramName("eventbus-subscribe");

		try {
			commander.parse(args);

			DefaultOptions.setLogLevel(options);

			if (options.mainParameters == null || options.mainParameters.size() < 1) {
				commander.usage();
				System.exit(1);
			}

			final Connector connector = AbstractClientOptions.configureConnector(options);
			final EventBus eventBus = connector.connect();
			for (String subject : options.mainParameters) {
				eventBus.subscribe(subject, new MessageHandler() {
					@Override
					public void onMessage(Message message) {
						System.out.println(message.getSubject() + " : " + message.getBody());
					}
				});

			}
		} catch (ParameterException e) {
			System.err.println(e.getMessage());
			commander.usage();
			System.exit(1);
		}
	}

	private static class Options extends AbstractClientOptions {

		@Parameter(description = "subject1 [subject2 ...]")
		List<String> mainParameters;

	}

}