| /* |
| * |
| * 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.qpid.proton.example.reactor; |
| |
| import java.io.IOException; |
| |
| import org.apache.qpid.proton.Proton; |
| import org.apache.qpid.proton.engine.BaseHandler; |
| import org.apache.qpid.proton.engine.Event; |
| import org.apache.qpid.proton.reactor.Reactor; |
| |
| /* |
| * The proton reactor provides a general purpose event processing |
| * library for writing reactive programs. A reactive program is defined |
| * by a set of event handlers. An event handler is just any class or |
| * object that extends the Handler interface. For convenience, a class |
| * can extend BaseHandler and only handle the events that it cares to |
| * implement methods for. |
| */ |
| public class HelloWorld extends BaseHandler { |
| |
| // The reactor init event is produced by the reactor itself when it |
| // starts. |
| @Override |
| public void onReactorInit(Event event) { |
| System.out.println("Hello, World!"); |
| } |
| |
| public static void main(String[] args) throws IOException { |
| |
| // When you construct a reactor, you can give it a handler that |
| // is used, by default, to receive events generated by the reactor. |
| Reactor reactor = Proton.reactor(new HelloWorld()); |
| |
| // When you call run, the reactor will process events. The reactor init |
| // event is what kicks off everything else. When the reactor has no |
| // more events to process, it exits. |
| reactor.run(); |
| } |
| } |