/
KafkaListenerEndpointRegistry.java
331 lines (286 loc) · 11.4 KB
/
KafkaListenerEndpointRegistry.java
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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
/*
* Copyright 2014-2019 the original author or authors.
*
* Licensed 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.springframework.kafka.config;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanInitializationException;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationListener;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.SmartLifecycle;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.kafka.listener.AbstractMessageListenerContainer;
import org.springframework.kafka.listener.MessageListenerContainer;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* Creates the necessary {@link MessageListenerContainer} instances for the
* registered {@linkplain KafkaListenerEndpoint endpoints}. Also manages the
* lifecycle of the listener containers, in particular within the lifecycle
* of the application context.
*
* <p>Contrary to {@link MessageListenerContainer}s created manually, listener
* containers managed by registry are not beans in the application context and
* are not candidates for autowiring. Use {@link #getListenerContainers()} if
* you need to access this registry's listener containers for management purposes.
* If you need to access to a specific message listener container, use
* {@link #getListenerContainer(String)} with the id of the endpoint.
*
* @author Stephane Nicoll
* @author Juergen Hoeller
* @author Artem Bilan
* @author Gary Russell
*
* @see KafkaListenerEndpoint
* @see MessageListenerContainer
* @see KafkaListenerContainerFactory
*/
public class KafkaListenerEndpointRegistry implements DisposableBean, SmartLifecycle, ApplicationContextAware,
ApplicationListener<ContextRefreshedEvent> {
protected final Log logger = LogFactory.getLog(getClass()); //NOSONAR
private final Map<String, MessageListenerContainer> listenerContainers =
new ConcurrentHashMap<String, MessageListenerContainer>();
private int phase = AbstractMessageListenerContainer.DEFAULT_PHASE;
private ConfigurableApplicationContext applicationContext;
private boolean contextRefreshed;
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
if (applicationContext instanceof ConfigurableApplicationContext) {
this.applicationContext = (ConfigurableApplicationContext) applicationContext;
}
}
/**
* Return the {@link MessageListenerContainer} with the specified id or
* {@code null} if no such container exists.
* @param id the id of the container
* @return the container or {@code null} if no container with that id exists
* @see KafkaListenerEndpoint#getId()
* @see #getListenerContainerIds()
*/
public MessageListenerContainer getListenerContainer(String id) {
Assert.hasText(id, "Container identifier must not be empty");
return this.listenerContainers.get(id);
}
/**
* Return the ids of the managed {@link MessageListenerContainer} instance(s).
* @return the ids.
* @see #getListenerContainer(String)
*/
public Set<String> getListenerContainerIds() {
return Collections.unmodifiableSet(this.listenerContainers.keySet());
}
/**
* Return the managed {@link MessageListenerContainer} instance(s).
* @return the managed {@link MessageListenerContainer} instance(s).
* @see #getAllListenerContainers()
*/
public Collection<MessageListenerContainer> getListenerContainers() {
return Collections.unmodifiableCollection(this.listenerContainers.values());
}
/**
* Return all {@link MessageListenerContainer} instances including those managed by
* this registry and those declared as beans in the application context.
* Prototype-scoped containers will be included. Lazy beans that have not yet been
* created will not be initialized by a call to this method.
* @return the {@link MessageListenerContainer} instance(s).
* @since 2.2.5
* @see #getListenerContainers()
*/
public Collection<MessageListenerContainer> getAllListenerContainers() {
List<MessageListenerContainer> containers = new ArrayList<>();
containers.addAll(getListenerContainers());
containers.addAll(this.applicationContext.getBeansOfType(MessageListenerContainer.class, true, false).values());
return containers;
}
/**
* Create a message listener container for the given {@link KafkaListenerEndpoint}.
* <p>This create the necessary infrastructure to honor that endpoint
* with regards to its configuration.
* @param endpoint the endpoint to add
* @param factory the listener factory to use
* @see #registerListenerContainer(KafkaListenerEndpoint, KafkaListenerContainerFactory, boolean)
*/
public void registerListenerContainer(KafkaListenerEndpoint endpoint, KafkaListenerContainerFactory<?> factory) {
registerListenerContainer(endpoint, factory, false);
}
/**
* Create a message listener container for the given {@link KafkaListenerEndpoint}.
* <p>This create the necessary infrastructure to honor that endpoint
* with regards to its configuration.
* <p>The {@code startImmediately} flag determines if the container should be
* started immediately.
* @param endpoint the endpoint to add.
* @param factory the {@link KafkaListenerContainerFactory} to use.
* @param startImmediately start the container immediately if necessary
* @see #getListenerContainers()
* @see #getListenerContainer(String)
*/
@SuppressWarnings("unchecked")
public void registerListenerContainer(KafkaListenerEndpoint endpoint, KafkaListenerContainerFactory<?> factory,
boolean startImmediately) {
Assert.notNull(endpoint, "Endpoint must not be null");
Assert.notNull(factory, "Factory must not be null");
String id = endpoint.getId();
Assert.hasText(id, "Endpoint id must not be empty");
synchronized (this.listenerContainers) {
Assert.state(!this.listenerContainers.containsKey(id),
"Another endpoint is already registered with id '" + id + "'");
MessageListenerContainer container = createListenerContainer(endpoint, factory);
this.listenerContainers.put(id, container);
if (StringUtils.hasText(endpoint.getGroup()) && this.applicationContext != null) {
List<MessageListenerContainer> containerGroup;
if (this.applicationContext.containsBean(endpoint.getGroup())) {
containerGroup = this.applicationContext.getBean(endpoint.getGroup(), List.class);
}
else {
containerGroup = new ArrayList<MessageListenerContainer>();
this.applicationContext.getBeanFactory().registerSingleton(endpoint.getGroup(), containerGroup);
}
containerGroup.add(container);
}
if (startImmediately) {
startIfNecessary(container);
}
}
}
/**
* Create and start a new {@link MessageListenerContainer} using the specified factory.
* @param endpoint the endpoint to create a {@link MessageListenerContainer}.
* @param factory the {@link KafkaListenerContainerFactory} to use.
* @return the {@link MessageListenerContainer}.
*/
protected MessageListenerContainer createListenerContainer(KafkaListenerEndpoint endpoint,
KafkaListenerContainerFactory<?> factory) {
MessageListenerContainer listenerContainer = factory.createListenerContainer(endpoint);
if (listenerContainer instanceof InitializingBean) {
try {
((InitializingBean) listenerContainer).afterPropertiesSet();
}
catch (Exception ex) {
throw new BeanInitializationException("Failed to initialize message listener container", ex);
}
}
int containerPhase = listenerContainer.getPhase();
if (listenerContainer.isAutoStartup() &&
containerPhase != AbstractMessageListenerContainer.DEFAULT_PHASE) { // a custom phase value
if (this.phase != AbstractMessageListenerContainer.DEFAULT_PHASE && this.phase != containerPhase) {
throw new IllegalStateException("Encountered phase mismatch between container "
+ "factory definitions: " + this.phase + " vs " + containerPhase);
}
this.phase = listenerContainer.getPhase();
}
return listenerContainer;
}
@Override
public void destroy() {
for (MessageListenerContainer listenerContainer : getListenerContainers()) {
if (listenerContainer instanceof DisposableBean) {
try {
((DisposableBean) listenerContainer).destroy();
}
catch (Exception ex) {
this.logger.warn("Failed to destroy message listener container", ex);
}
}
}
}
// Delegating implementation of SmartLifecycle
@Override
public int getPhase() {
return this.phase;
}
@Override
public boolean isAutoStartup() {
return true;
}
@Override
public void start() {
for (MessageListenerContainer listenerContainer : getListenerContainers()) {
startIfNecessary(listenerContainer);
}
}
@Override
public void stop() {
for (MessageListenerContainer listenerContainer : getListenerContainers()) {
listenerContainer.stop();
}
}
@Override
public void stop(Runnable callback) {
Collection<MessageListenerContainer> listenerContainersToStop = getListenerContainers();
AggregatingCallback aggregatingCallback = new AggregatingCallback(listenerContainersToStop.size(), callback);
for (MessageListenerContainer listenerContainer : listenerContainersToStop) {
if (listenerContainer.isRunning()) {
listenerContainer.stop(aggregatingCallback);
}
else {
aggregatingCallback.run();
}
}
}
@Override
public boolean isRunning() {
for (MessageListenerContainer listenerContainer : getListenerContainers()) {
if (listenerContainer.isRunning()) {
return true;
}
}
return false;
}
@Override
public void onApplicationEvent(ContextRefreshedEvent event) {
if (event.getApplicationContext().equals(this.applicationContext)) {
this.contextRefreshed = true;
}
}
/**
* Start the specified {@link MessageListenerContainer} if it should be started
* on startup.
* @param listenerContainer the listener container to start.
* @see MessageListenerContainer#isAutoStartup()
*/
private void startIfNecessary(MessageListenerContainer listenerContainer) {
if (this.contextRefreshed || listenerContainer.isAutoStartup()) {
listenerContainer.start();
}
}
private static final class AggregatingCallback implements Runnable {
private final AtomicInteger count;
private final Runnable finishCallback;
private AggregatingCallback(int count, Runnable finishCallback) {
this.count = new AtomicInteger(count);
this.finishCallback = finishCallback;
}
@Override
public void run() {
if (this.count.decrementAndGet() <= 0) {
this.finishCallback.run();
}
}
}
}