| /* |
| * |
| * 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 java.nio.BufferOverflowException; |
| |
| import org.apache.qpid.proton.Proton; |
| import org.apache.qpid.proton.amqp.messaging.AmqpValue; |
| import org.apache.qpid.proton.amqp.transport.ErrorCondition; |
| import org.apache.qpid.proton.engine.BaseHandler; |
| import org.apache.qpid.proton.engine.Connection; |
| import org.apache.qpid.proton.engine.Delivery; |
| import org.apache.qpid.proton.engine.Event; |
| import org.apache.qpid.proton.engine.Sender; |
| import org.apache.qpid.proton.engine.Session; |
| import org.apache.qpid.proton.message.Message; |
| import org.apache.qpid.proton.reactor.Handshaker; |
| import org.apache.qpid.proton.reactor.Reactor; |
| |
| // This is a send in terms of low level AMQP events. |
| public class Send extends BaseHandler { |
| |
| private class SendHandler extends BaseHandler { |
| |
| private final Message message; |
| private int nextTag = 0; |
| |
| private SendHandler(Message message) { |
| this.message = message; |
| |
| // Add a child handler that performs some default handshaking |
| // behaviour. |
| add(new Handshaker()); |
| } |
| |
| @Override |
| public void onConnectionInit(Event event) { |
| Connection conn = event.getConnection(); |
| |
| // Every session or link could have their own handler(s) if we |
| // wanted simply by adding the handler to the given session |
| // or link |
| Session ssn = conn.session(); |
| |
| // If a link doesn't have an event handler, the events go to |
| // its parent session. If the session doesn't have a handler |
| // the events go to its parent connection. If the connection |
| // doesn't have a handler, the events go to the reactor. |
| Sender snd = ssn.sender("sender"); |
| conn.open(); |
| ssn.open(); |
| snd.open(); |
| } |
| |
| @Override |
| public void onLinkFlow(Event event) { |
| Sender snd = (Sender)event.getLink(); |
| if (snd.getCredit() > 0) { |
| byte[] msgData = new byte[1024]; |
| int length; |
| while(true) { |
| try { |
| length = message.encode(msgData, 0, msgData.length); |
| break; |
| } catch(BufferOverflowException e) { |
| msgData = new byte[msgData.length * 2]; |
| } |
| } |
| byte[] tag = String.valueOf(nextTag++).getBytes(); |
| Delivery dlv = snd.delivery(tag); |
| snd.send(msgData, 0, length); |
| dlv.settle(); |
| snd.advance(); |
| snd.close(); |
| snd.getSession().close(); |
| snd.getSession().getConnection().close(); |
| } |
| } |
| |
| @Override |
| public void onTransportError(Event event) { |
| ErrorCondition condition = event.getTransport().getCondition(); |
| if (condition != null) { |
| System.err.println("Error: " + condition.getDescription()); |
| } else { |
| System.err.println("Error (no description returned)."); |
| } |
| } |
| } |
| |
| private final String host; |
| private final int port; |
| private final Message message; |
| |
| private Send(String host, int port, String content) { |
| this.host = host; |
| this.port = port; |
| message = Proton.message(); |
| message.setBody(new AmqpValue(content)); |
| } |
| |
| @Override |
| public void onReactorInit(Event event) { |
| // You can use the connection method to create AMQP connections. |
| |
| // This connection's handler is the SendHandler object. All the events |
| // for this connection will go to the SendHandler object instead of |
| // going to the reactor. If you were to omit the SendHandler object, |
| // all the events would go to the reactor. |
| event.getReactor().connectionToHost(host, port, new SendHandler(message)); |
| } |
| |
| public static void main(String[] args) throws IOException { |
| int port = 5672; |
| String host = "localhost"; |
| if (args.length > 0) { |
| String[] parts = args[0].split(":", 2); |
| host = parts[0]; |
| if (parts.length > 1) { |
| port = Integer.parseInt(parts[1]); |
| } |
| } |
| String content = args.length > 1 ? args[1] : "Hello World!"; |
| |
| Reactor r = Proton.reactor(new Send(host, port, content)); |
| r.run(); |
| } |
| |
| } |