blob: 76827d4837aab083c672f44eb0879abc588191aa (
plain)
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
|
/*
* Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.netconf.sal.streams.listeners;
import com.google.common.eventbus.AsyncEventBus;
import com.google.common.eventbus.EventBus;
import io.netty.channel.Channel;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Executors;
import org.opendaylight.yangtools.concepts.ListenerRegistration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Features of subscribing part of both notifications.
*/
abstract class AbstractCommonSubscriber extends AbstractQueryParams implements BaseListenerInterface {
private static final Logger LOG = LoggerFactory.getLogger(AbstractCommonSubscriber.class);
private final Set<Channel> subscribers = ConcurrentHashMap.newKeySet();
private final EventBus eventBus;
@SuppressWarnings("rawtypes")
private EventBusChangeRecorder eventBusChangeRecorder;
@SuppressWarnings("rawtypes")
private ListenerRegistration registration;
/**
* Creating {@link EventBus}.
*/
protected AbstractCommonSubscriber() {
this.eventBus = new AsyncEventBus(Executors.newSingleThreadExecutor());
}
@Override
public final boolean hasSubscribers() {
return !this.subscribers.isEmpty();
}
@Override
public final Set<Channel> getSubscribers() {
return this.subscribers;
}
@Override
public final void close() {
if (registration != null) {
this.registration.close();
this.registration = null;
}
unregister();
}
/**
* Creates event of type {@link EventType#REGISTER}, set {@link Channel}
* subscriber to the event and post event into event bus.
*
* @param subscriber
* Channel
*/
public void addSubscriber(final Channel subscriber) {
if (!subscriber.isActive()) {
LOG.debug("Channel is not active between websocket server and subscriber {}", subscriber.remoteAddress());
}
final Event event = new Event(EventType.REGISTER);
event.setSubscriber(subscriber);
this.eventBus.post(event);
}
/**
* Creates event of type {@link EventType#DEREGISTER}, sets {@link Channel}
* subscriber to the event and posts event into event bus.
*
* @param subscriber subscriber channel
*/
public void removeSubscriber(final Channel subscriber) {
LOG.debug("Subscriber {} is removed.", subscriber.remoteAddress());
final Event event = new Event(EventType.DEREGISTER);
event.setSubscriber(subscriber);
this.eventBus.post(event);
}
/**
* Sets {@link ListenerRegistration} registration.
*
* @param registration
* DOMDataChangeListener registration
*/
@SuppressWarnings("rawtypes")
public void setRegistration(final ListenerRegistration registration) {
this.registration = registration;
}
/**
* Checks if {@link ListenerRegistration} registration exist.
*
* @return True if exist, false otherwise.
*/
public boolean isListening() {
return this.registration != null;
}
/**
* Creating and registering {@link EventBusChangeRecorder} of specific
* listener on {@link EventBus}.
*
* @param listener
* specific listener of notifications
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
protected <T extends BaseListenerInterface> void register(final T listener) {
this.eventBusChangeRecorder = new EventBusChangeRecorder(listener);
this.eventBus.register(this.eventBusChangeRecorder);
}
/**
* Post event to event bus.
*
* @param event
* data of incoming notifications
*/
protected void post(final Event event) {
this.eventBus.post(event);
}
/**
* Removes all subscribers and unregisters event bus change recorder form
* event bus.
*/
protected void unregister() {
this.subscribers.clear();
this.eventBus.unregister(this.eventBusChangeRecorder);
}
}
|
