001 /*
002 GRANITE DATA SERVICES
003 Copyright (C) 2012 GRANITE DATA SERVICES S.A.S.
004
005 This file is part of Granite Data Services.
006
007 Granite Data Services is free software; you can redistribute it and/or modify
008 it under the terms of the GNU Library General Public License as published by
009 the Free Software Foundation; either version 2 of the License, or (at your
010 option) any later version.
011
012 Granite Data Services is distributed in the hope that it will be useful, but
013 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015 for more details.
016
017 You should have received a copy of the GNU Library General Public License
018 along with this library; if not, see <http://www.gnu.org/licenses/>.
019 */
020
021 package org.granite.client.messaging;
022
023 import java.util.ArrayList;
024 import java.util.Arrays;
025 import java.util.List;
026 import java.util.concurrent.TimeUnit;
027
028 import org.granite.client.messaging.channel.Channel;
029 import org.granite.client.messaging.channel.ResponseMessageFuture;
030 import org.granite.client.messaging.messages.requests.InvocationMessage;
031
032 /**
033 * @author Franck WOLFF
034 */
035 public class RemoteService {
036
037 private final Channel channel;
038 private final String id;
039
040 public RemoteService(Channel channel, String id) {
041 if (channel == null || id == null)
042 throw new NullPointerException("channel and id cannot be null");
043 this.channel = channel;
044 this.id = id;
045 }
046
047 public Channel getChannel() {
048 return channel;
049 }
050
051 public String getId() {
052 return id;
053 }
054
055 public RemoteServiceInvocation newInvocation(String method, Object...parameters) {
056 return new RemoteServiceInvocation(this, method, parameters);
057 }
058
059 public static interface RemoteServiceInvocationChain {
060
061 RemoteServiceInvocationChain appendInvocation(String method, Object...parameters);
062 ResponseMessageFuture invoke();
063 }
064
065 public static class RemoteServiceInvocation implements RemoteServiceInvocationChain {
066
067 private final RemoteService remoteService;
068 private final InvocationMessage request;
069
070 private long timeToLive = 0L;
071 private List<ResponseListener> listeners = new ArrayList<ResponseListener>();
072
073 public RemoteServiceInvocation(RemoteService remoteService, String method, Object...parameters) {
074 if (remoteService == null)
075 throw new NullPointerException("remoteService cannot be null");
076 this.remoteService = remoteService;
077 this.request = new InvocationMessage(null, remoteService.id, method, parameters);
078 }
079
080 public RemoteServiceInvocation addListener(ResponseListener listener) {
081 if (listener != null)
082 this.listeners.add(listener);
083 return this;
084 }
085
086 public RemoteServiceInvocation addListeners(ResponseListener...listeners) {
087 if (listeners != null && listeners.length > 0)
088 this.listeners.addAll(Arrays.asList(listeners));
089 return this;
090 }
091
092 public RemoteServiceInvocation setTimeToLive(long timeToLiveMillis) {
093 return setTimeToLive(timeToLiveMillis, TimeUnit.MILLISECONDS);
094 }
095
096 public RemoteServiceInvocation setTimeToLive(long timeToLive, TimeUnit unit) {
097 if (timeToLive < 0)
098 throw new IllegalArgumentException("timeToLive cannot be negative");
099 if (unit == null)
100 throw new NullPointerException("unit cannot be null");
101 this.timeToLive = unit.toMillis(timeToLive);
102 return this;
103 }
104
105 @Override
106 public RemoteServiceInvocationChain appendInvocation(String method, Object...parameters) {
107 InvocationMessage message = request;
108 while (message.getNext() != null)
109 message = message.getNext();
110 message.setNext(new InvocationMessage(null, remoteService.id, method, parameters));
111 return this;
112 }
113
114 @Override
115 public ResponseMessageFuture invoke() {
116 request.setTimeToLive(timeToLive);
117 return remoteService.channel.send(request, listeners.toArray(new ResponseListener[listeners.size()]));
118 }
119 }
120 }