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Java > Open Source Codes > org > jacorb > notification > servant > ProxyPullSupplierImpl


1 package org.jacorb.notification.servant;
2
3 /*
4  * JacORB - a free Java ORB
5  *
6  * Copyright (C) 1997-2004 Gerald Brose.
7  *
8  * This library is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Library General Public
10  * License as published by the Free Software Foundation; either
11  * version 2 of the License, or (at your option) any later version.
12  *
13  * This library is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Library General Public License for more details.
17  *
18  * You should have received a copy of the GNU Library General Public
19  * License along with this library; if not, write to the Free
20  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  */
22
23 import java.util.List JavaDoc;
24
25 import org.apache.avalon.framework.configuration.Configuration;
26 import org.apache.avalon.framework.configuration.ConfigurationException;
27 import org.jacorb.notification.OfferManager;
28 import org.jacorb.notification.SubscriptionManager;
29 import org.jacorb.notification.engine.TaskProcessor;
30 import org.jacorb.notification.interfaces.Message;
31 import org.jacorb.notification.interfaces.MessageConsumer;
32 import org.jacorb.notification.util.CollectionsWrapper;
33 import org.omg.CORBA.Any JavaDoc;
34 import org.omg.CORBA.BooleanHolder JavaDoc;
35 import org.omg.CORBA.ORB JavaDoc;
36 import org.omg.CORBA.UNKNOWN JavaDoc;
37 import org.omg.CosEventChannelAdmin.AlreadyConnected;
38 import org.omg.CosEventComm.Disconnected;
39 import org.omg.CosEventComm.PullConsumer;
40 import org.omg.CosNotifyChannelAdmin.ConsumerAdmin;
41 import org.omg.CosNotifyChannelAdmin.ProxyPullSupplierOperations;
42 import org.omg.CosNotifyChannelAdmin.ProxyPullSupplierPOATie;
43 import org.omg.CosNotifyChannelAdmin.ProxySupplierHelper;
44 import org.omg.CosNotifyChannelAdmin.ProxyType;
45 import org.omg.PortableServer.POA JavaDoc;
46 import org.omg.PortableServer.Servant JavaDoc;
47
48 /**
49  * @author Alphonse Bendt
50  * @version $Id: ProxyPullSupplierImpl.java,v 1.13 2005/04/27 10:45:46 alphonse.bendt Exp $
51  */
52
53 public class ProxyPullSupplierImpl extends AbstractProxySupplier implements
54         ProxyPullSupplierOperations
55 {
56     private static final Any JavaDoc sUndefinedAny;
57
58     static
59     {
60         ORB JavaDoc _orb = ORB.init();
61
62         sUndefinedAny = _orb.create_any();
63     }
64
65     ////////////////////////////////////////
66
67     private PullConsumer pullConsumer_ = null;
68
69     ////////////////////////////////////////
70
71     public ProxyPullSupplierImpl(IAdmin admin, ORB JavaDoc orb, POA JavaDoc poa, Configuration config, TaskProcessor taskProcessor, OfferManager offerManager, SubscriptionManager subscriptionManager, ConsumerAdmin consumerAdmin)
72             throws ConfigurationException
73     {
74         super(admin, orb, poa, config, taskProcessor, offerManager, subscriptionManager, consumerAdmin);
75     }
76
77     public ProxyType MyType()
78     {
79         return ProxyType.PULL_ANY;
80     }
81
82     public void disconnect_pull_supplier()
83     {
84         destroy();
85     }
86
87     protected void disconnectClient()
88     {
89         if (pullConsumer_ != null)
90         {
91             logger_.info("disconnect any_pull_consumer");
92
93             pullConsumer_.disconnect_pull_consumer();
94             pullConsumer_ = null;
95         }
96     }
97
98     public Any JavaDoc pull() throws Disconnected
99     {
100         checkStillConnected();
101
102         try
103         {
104             Message _event = getMessageBlocking();
105             try
106             {
107                 return _event.toAny();
108             } finally
109             {
110                 _event.dispose();
111             }
112         } catch (InterruptedException JavaDoc e)
113         {
114             logger_.fatalError("interrupted", e);
115
116             throw new UNKNOWN JavaDoc();
117         }
118     }
119
120     public Any JavaDoc try_pull(BooleanHolder JavaDoc hasEvent) throws Disconnected
121     {
122         checkStillConnected();
123
124         hasEvent.value = false;
125
126         Message _message = getMessageNoBlock();
127
128         if (_message != null)
129         {
130             try
131             {
132                 hasEvent.value = true;
133
134                 return _message.toAny();
135             } finally
136             {
137                 _message.dispose();
138             }
139         }
140
141         return sUndefinedAny;
142     }
143
144     public void connect_any_pull_consumer(PullConsumer consumer) throws AlreadyConnected
145     {
146         logger_.info("connect any_pull_consumer");
147
148         checkIsNotConnected();
149
150         pullConsumer_ = consumer;
151
152         connectClient(consumer);
153     }
154
155     public List JavaDoc getSubsequentFilterStages()
156     {
157         return CollectionsWrapper.singletonList(this);
158     }
159
160     public MessageConsumer getMessageConsumer()
161     {
162         return this;
163     }
164
165     public void enableDelivery()
166     {
167         // as delivery to this PullSupplier causes no remote calls
168 // we can ignore this
169 }
170
171     public void disableDelivery()
172     {
173         // as delivery to this PullSupplier causes no remote calls
174 // we can ignore this
175 }
176
177     public void deliverPendingData()
178     {
179         // as we do not actively deliver events we can ignore this
180 }
181
182     public synchronized Servant JavaDoc getServant()
183     {
184         if (thisServant_ == null)
185         {
186             thisServant_ = new ProxyPullSupplierPOATie(this);
187         }
188         return thisServant_;
189     }
190
191     public org.omg.CORBA.Object JavaDoc activate()
192     {
193         return ProxySupplierHelper.narrow(getServant()._this_object(getORB()));
194     }
195     
196     protected long getCost()
197     {
198         return 0;
199     }
200 }
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