-
Notifications
You must be signed in to change notification settings - Fork 26.3k
/
ReferenceAnnotationBeanPostProcessor.java
253 lines (202 loc) · 9.99 KB
/
ReferenceAnnotationBeanPostProcessor.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
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 com.alibaba.dubbo.config.spring.beans.factory.annotation;
import com.alibaba.dubbo.config.annotation.Reference;
import com.alibaba.dubbo.config.spring.ReferenceBean;
import com.alibaba.dubbo.config.spring.ServiceBean;
import com.alibaba.dubbo.config.spring.context.event.ServiceBeanExportedEvent;
import com.alibaba.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor;
import com.alibaba.spring.util.AnnotationUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.InjectionMetadata;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* {@link org.springframework.beans.factory.config.BeanPostProcessor} implementation
* that Consumer service {@link Reference} annotated fields
*
* @since 2.5.7
*/
public class ReferenceAnnotationBeanPostProcessor extends AnnotationInjectedBeanPostProcessor<Reference>
implements ApplicationContextAware, ApplicationListener {
/**
* The bean name of {@link ReferenceAnnotationBeanPostProcessor}
*/
public static final String BEAN_NAME = "referenceAnnotationBeanPostProcessor";
/**
* Cache size
*/
private static final int CACHE_SIZE = Integer.getInteger(BEAN_NAME + ".cache.size", 32);
private final ConcurrentMap<String, ReferenceBean<?>> referenceBeanCache =
new ConcurrentHashMap<String, ReferenceBean<?>>(CACHE_SIZE);
private final ConcurrentHashMap<String, ReferenceBeanInvocationHandler> localReferenceBeanInvocationHandlerCache =
new ConcurrentHashMap<String, ReferenceBeanInvocationHandler>(CACHE_SIZE);
private final ConcurrentMap<InjectionMetadata.InjectedElement, ReferenceBean<?>> injectedFieldReferenceBeanCache =
new ConcurrentHashMap<InjectionMetadata.InjectedElement, ReferenceBean<?>>(CACHE_SIZE);
private final ConcurrentMap<InjectionMetadata.InjectedElement, ReferenceBean<?>> injectedMethodReferenceBeanCache =
new ConcurrentHashMap<InjectionMetadata.InjectedElement, ReferenceBean<?>>(CACHE_SIZE);
private ApplicationContext applicationContext;
/**
* Gets all beans of {@link ReferenceBean}
*
* @return non-null read-only {@link Collection}
* @since 2.5.9
*/
public Collection<ReferenceBean<?>> getReferenceBeans() {
return referenceBeanCache.values();
}
/**
* Get {@link ReferenceBean} {@link Map} in injected field.
*
* @return non-null {@link Map}
* @since 2.5.11
*/
public Map<InjectionMetadata.InjectedElement, ReferenceBean<?>> getInjectedFieldReferenceBeanMap() {
return Collections.unmodifiableMap(injectedFieldReferenceBeanCache);
}
/**
* Get {@link ReferenceBean} {@link Map} in injected method.
*
* @return non-null {@link Map}
* @since 2.5.11
*/
public Map<InjectionMetadata.InjectedElement, ReferenceBean<?>> getInjectedMethodReferenceBeanMap() {
return Collections.unmodifiableMap(injectedMethodReferenceBeanCache);
}
@Override
protected Object doGetInjectedBean(Reference reference, Object bean, String beanName, Class<?> injectedType,
InjectionMetadata.InjectedElement injectedElement) throws Exception {
String referencedBeanName = buildReferencedBeanName(reference, injectedType);
ReferenceBean referenceBean = buildReferenceBeanIfAbsent(referencedBeanName, reference, injectedType, getClassLoader());
cacheInjectedReferenceBean(referenceBean, injectedElement);
Object proxy = buildProxy(referencedBeanName, referenceBean, injectedType);
return proxy;
}
private Object buildProxy(String referencedBeanName, ReferenceBean referenceBean, Class<?> injectedType) {
InvocationHandler handler = buildInvocationHandler(referencedBeanName, referenceBean);
Object proxy = Proxy.newProxyInstance(getClassLoader(), new Class[]{injectedType}, handler);
return proxy;
}
private InvocationHandler buildInvocationHandler(String referencedBeanName, ReferenceBean referenceBean) {
ReferenceBeanInvocationHandler handler = localReferenceBeanInvocationHandlerCache.get(referencedBeanName);
if (handler == null) {
handler = new ReferenceBeanInvocationHandler(referenceBean);
}
if (applicationContext.containsBean(referencedBeanName)) { // Is local @Service Bean or not ?
// ReferenceBeanInvocationHandler's initialization has to wait for current local @Service Bean has been exported.
localReferenceBeanInvocationHandlerCache.put(referencedBeanName, handler);
} else {
// Remote Reference Bean should initialize immediately
handler.init();
}
return handler;
}
private static class ReferenceBeanInvocationHandler implements InvocationHandler {
private final ReferenceBean referenceBean;
private Object bean;
private ReferenceBeanInvocationHandler(ReferenceBean referenceBean) {
this.referenceBean = referenceBean;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
return method.invoke(bean, args);
}
private void init() {
this.bean = referenceBean.get();
}
}
@Override
protected String buildInjectedObjectCacheKey(Reference reference, Object bean, String beanName,
Class<?> injectedType, InjectionMetadata.InjectedElement injectedElement) {
String key = buildReferencedBeanName(reference, injectedType) +
"#source=" + (injectedElement.getMember()) +
"#attributes=" + AnnotationUtils.getAttributes(reference,getEnvironment(),true);
return key;
}
private String buildReferencedBeanName(Reference reference, Class<?> injectedType) {
ServiceBeanNameBuilder builder = ServiceBeanNameBuilder.create(reference, injectedType, getEnvironment());
return getEnvironment().resolvePlaceholders(builder.build());
}
private ReferenceBean buildReferenceBeanIfAbsent(String referencedBeanName, Reference reference,
Class<?> referencedType, ClassLoader classLoader)
throws Exception {
ReferenceBean<?> referenceBean = referenceBeanCache.get(referencedBeanName);
if (referenceBean == null) {
ReferenceBeanBuilder beanBuilder = ReferenceBeanBuilder
.create(reference, classLoader, applicationContext)
.interfaceClass(referencedType);
referenceBean = beanBuilder.build();
referenceBeanCache.put(referencedBeanName, referenceBean);
}
return referenceBean;
}
private void cacheInjectedReferenceBean(ReferenceBean referenceBean,
InjectionMetadata.InjectedElement injectedElement) {
if (injectedElement.getMember() instanceof Field) {
injectedFieldReferenceBeanCache.put(injectedElement, referenceBean);
} else if (injectedElement.getMember() instanceof Method) {
injectedMethodReferenceBeanCache.put(injectedElement, referenceBean);
}
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
@Override
public void onApplicationEvent(ApplicationEvent event) {
if (event instanceof ServiceBeanExportedEvent) {
onServiceBeanExportEvent((ServiceBeanExportedEvent) event);
} else if (event instanceof ContextRefreshedEvent) {
onContextRefreshedEvent((ContextRefreshedEvent) event);
}
}
private void onServiceBeanExportEvent(ServiceBeanExportedEvent event) {
ServiceBean serviceBean = event.getServiceBean();
initReferenceBeanInvocationHandler(serviceBean);
}
private void initReferenceBeanInvocationHandler(ServiceBean serviceBean) {
String serviceBeanName = serviceBean.getBeanName();
// Remove ServiceBean when it's exported
ReferenceBeanInvocationHandler handler = localReferenceBeanInvocationHandlerCache.remove(serviceBeanName);
// Initialize
if (handler != null) {
handler.init();
}
}
private void onContextRefreshedEvent(ContextRefreshedEvent event) {
}
@Override
public void destroy() throws Exception {
super.destroy();
this.referenceBeanCache.clear();
this.localReferenceBeanInvocationHandlerCache.clear();
this.injectedFieldReferenceBeanCache.clear();
this.injectedMethodReferenceBeanCache.clear();
}
}