1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
package org.eclipse.rap.e4.internal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Dictionary;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import javax.annotation.PreDestroy;
import javax.inject.Inject;
import javax.inject.Named;
import org.eclipse.e4.core.di.annotations.Optional;
import org.eclipse.e4.core.services.events.IEventBroker;
import org.eclipse.e4.core.services.log.Logger;
import org.eclipse.e4.ui.di.UISynchronize;
import org.eclipse.e4.ui.internal.workbench.swt.E4Application;
import org.eclipse.e4.ui.model.application.MApplication;
import org.eclipse.e4.ui.workbench.IWorkbench;
import org.eclipse.osgi.util.NLS;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventAdmin;
import org.osgi.service.event.EventConstants;
import org.osgi.service.event.EventHandler;
public class RAPEventBroker implements IEventBroker {
// TBD synchronization
private static final String ASYNC_EVENT = "rap.async.event";
private Map<EventHandler, Collection<ServiceRegistration<?>>> registrations = new HashMap<EventHandler, Collection<ServiceRegistration<?>>>();
@Inject
Logger logger;
@Inject
@Optional
UISynchronize uiSync;
@Inject
@Named(E4Application.INSTANCEID)
String instanceId;
// This is a temporary code to ensure that bundle containing
// EventAdmin implementation is started. This code it to be removed once
// the proper method to start EventAdmin is added.
static {
EventAdmin eventAdmin = Activator.getDefault().getEventAdmin();
if (eventAdmin == null) {
Bundle[] bundles = Activator.getDefault().getBundleContext().getBundles();
for (Bundle bundle : bundles) {
if (!"org.eclipse.equinox.event".equals(bundle.getSymbolicName()))
continue;
try {
bundle.start(Bundle.START_TRANSIENT);
} catch (BundleException e) {
e.printStackTrace();
}
break;
}
}
}
public RAPEventBroker() {
// placeholder
}
public boolean send(String topic, Object data) {
Event event = constructEvent(topic, data, false);
EventAdmin eventAdmin = Activator.getDefault().getEventAdmin();
if (eventAdmin == null) {
logger.error(NLS.bind("No EventAdmin", event.toString()));
return false;
}
eventAdmin.sendEvent(event);
return true;
}
public boolean post(String topic, Object data) {
Event event = constructEvent(topic, data, true);
EventAdmin eventAdmin = Activator.getDefault().getEventAdmin();
if (eventAdmin == null) {
logger.error(NLS.bind("No EventAdmin", event.toString()));
return false;
}
eventAdmin.postEvent(event);
return true;
}
@SuppressWarnings("unchecked")
private Event constructEvent(String topic, Object data, boolean async) {
topic = rapifyTopic(instanceId, topic);
Event event;
if (data instanceof Dictionary<?,?>) {
Dictionary<String,Object> properties = (Dictionary<String,Object>)data;
if (async)
properties.put(ASYNC_EVENT, Boolean.TRUE);
event = new Event(topic, properties);
} else if (data instanceof Map<?,?>) {
Map<String,Object> properties = (Map<String,Object>)data;
if (async)
properties.put(ASYNC_EVENT, Boolean.TRUE);
event = new Event(topic, properties);
} else {
Dictionary<String, Object> d = new Hashtable<String, Object>(3);
d.put(EventConstants.EVENT_TOPIC, topic);
if (data != null)
d.put(IEventBroker.DATA, data);
if (async)
d.put(ASYNC_EVENT, Boolean.TRUE);
event = new Event(topic, d);
}
return event;
}
public boolean subscribe(String topic, EventHandler eventHandler) {
return subscribe(topic, null, eventHandler, false);
}
public boolean subscribe(String topic, String filter, EventHandler eventHandler, boolean headless) {
topic = rapifyTopic(instanceId, topic);
BundleContext bundleContext = Activator.getDefault().getBundleContext();
if (bundleContext == null) {
logger.error(NLS.bind("No EventAdmin", topic));
return false;
}
String[] topics = new String[] {topic};
Dictionary<String, Object> d = new Hashtable<String, Object>();
d.put(EventConstants.EVENT_TOPIC, topics);
if (filter != null)
d.put(EventConstants.EVENT_FILTER, filter);
EventHandler wrappedHandler = new RAPUIEventHandler(eventHandler, headless ? null : uiSync);
ServiceRegistration<?> registration = bundleContext.registerService(
EventHandler.class.getName(), wrappedHandler, d);
Collection<ServiceRegistration<?>> handled = registrations
.get(eventHandler);
if (handled == null) {
registrations.put(eventHandler,
handled = new ArrayList<ServiceRegistration<?>>());
}
handled.add(registration);
return true;
}
public boolean unsubscribe(EventHandler eventHandler) {
Collection<ServiceRegistration<?>> handled = registrations
.remove(eventHandler);
if (handled == null || handled.isEmpty())
return false;
for (ServiceRegistration<?> r : handled) {
r.unregister();
}
return true;
}
@PreDestroy
void dispose() {
Collection<Collection<ServiceRegistration<?>>> values = new ArrayList<Collection<ServiceRegistration<?>>>(
registrations.values());
registrations.clear();
for (Collection<ServiceRegistration<?>> handled : values) {
for (ServiceRegistration<?> registration : handled) {
// System.out.println("EventBroker dispose:" + registration[i] +
// ")");
registration.unregister();
}
}
}
public static String rapifyTopic(String instanceId, String topic) {
String rv = instanceId + "/" + topic;
// System.err.println("Original: " + topic + ", RAPified: " + rv);
return rv;
}
public static boolean isAsyncEvent(Event event) {
return Boolean.TRUE.equals(event.getProperty(ASYNC_EVENT));
}
}
|
