/**
* Copyright 2007-2011 Zuse Institute Berlin
*
* 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 de.zib.scalaris.examples;
import com.ericsson.otp.erlang.OtpErlangString;
import de.zib.scalaris.AbortException;
import de.zib.scalaris.ConnectionException;
import de.zib.scalaris.PubSub;
import de.zib.scalaris.TimeoutException;
import de.zib.scalaris.UnknownException;
/**
* Provides an example for using the <tt>subscribe</tt> methods of the
* {@link PubSub} class.
*
* @author Nico Kruber, kruber@zib.de
* @version 2.5
* @since 2.5
*/
public class PubSubSubscribeExample {
/**
* Subscribes a given URL to a given topic, both provided on the command
* line, with the <tt>subscribe</tt> methods of {@link PubSub}.<br />
* If no URL or topic is given, the default URL <tt>"url"</tt> and the
* default topic <tt>"topic"</tt> is used.
*
* @param args
* command line arguments (first argument can be an optional
* topic and the second an optional URL)
*/
public static void main(final String[] args) {
String topic;
String URL;
if (args.length == 0) {
topic = "topic";
URL = "url";
} else if (args.length == 1) {
topic = args[0];
URL = "url";
} else {
topic = args[0];
URL = args[1];
}
final OtpErlangString otpTopic = new OtpErlangString(topic);
final OtpErlangString otpURL = new OtpErlangString(URL);
System.out
.println("Subscribing a URL to a topic with the class `PubSub`:");
try {
System.out.println(" creating object...");
final PubSub sc = new PubSub();
System.out
.println(" `void subscribe(OtpErlangString, OtpErlangString)`...");
sc.subscribe(otpTopic, otpURL);
System.out.println(" subscribe(" + otpTopic.stringValue()
+ ", " + otpURL.stringValue() + ") succeeded");
} catch (final ConnectionException e) {
System.out.println(" subscribe(" + otpTopic.stringValue()
+ ", " + otpURL.stringValue() + ") failed: "
+ e.getMessage());
} catch (final TimeoutException e) {
System.out.println(" subscribe(" + otpTopic.stringValue()
+ ", " + otpURL.stringValue() + ") failed with timeout: "
+ e.getMessage());
} catch (final AbortException e) {
System.out.println(" subscribe(" + otpTopic.stringValue()
+ ", " + otpURL.stringValue() + ") failed with abort: "
+ e.getMessage());
} catch (final UnknownException e) {
System.out.println(" subscribe(" + otpTopic.stringValue()
+ ", " + otpURL.stringValue() + ") failed with unknown: "
+ e.getMessage());
}
try {
System.out.println(" creating object...");
final PubSub sc = new PubSub();
System.out.println(" `void subscribe(String, String)`...");
sc.subscribe(topic, URL);
System.out.println(" subscribe(" + topic + ", " + URL
+ ") succeeded");
} catch (final ConnectionException e) {
System.out.println(" subscribe(" + topic + ", " + URL
+ ") failed: " + e.getMessage());
} catch (final TimeoutException e) {
System.out.println(" subscribe(" + topic + ", " + URL
+ ") failed with timeout: " + e.getMessage());
} catch (final AbortException e) {
System.out.println(" subscribe(" + topic + ", " + URL
+ ") failed with abort: " + e.getMessage());
} catch (final UnknownException e) {
System.out.println(" subscribe(" + topic + ", " + URL
+ ") failed with unknown: " + e.getMessage());
}
}
}