-
Notifications
You must be signed in to change notification settings - Fork 1.1k
/
ChangeStreamEvent.java
236 lines (194 loc) · 6.84 KB
/
ChangeStreamEvent.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
/*
* Copyright 2018-2022 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
*
* https://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.data.mongodb.core;
import java.time.Instant;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import org.bson.BsonTimestamp;
import org.bson.BsonValue;
import org.bson.Document;
import org.springframework.data.mongodb.core.convert.MongoConverter;
import org.springframework.data.mongodb.core.messaging.Message;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;
import org.springframework.util.ObjectUtils;
import com.mongodb.client.model.changestream.ChangeStreamDocument;
import com.mongodb.client.model.changestream.OperationType;
/**
* {@link Message} implementation specific to MongoDB <a href="https://docs.mongodb.com/manual/changeStreams/">Change
* Streams</a>.
*
* @author Christoph Strobl
* @author Mark Paluch
* @author Myroslav Kosinskyi
* @since 2.1
*/
public class ChangeStreamEvent<T> {
@SuppressWarnings("rawtypes") //
private static final AtomicReferenceFieldUpdater<ChangeStreamEvent, Object> CONVERTED_FULL_DOCUMENT_UPDATER = AtomicReferenceFieldUpdater
.newUpdater(ChangeStreamEvent.class, Object.class, "convertedFullDocument");
@SuppressWarnings("rawtypes") //
private static final AtomicReferenceFieldUpdater<ChangeStreamEvent, Object> CONVERTED_FULL_DOCUMENT_BEFORE_CHANGE_UPDATER = AtomicReferenceFieldUpdater
.newUpdater(ChangeStreamEvent.class, Object.class, "convertedFullDocumentBeforeChange");
private final @Nullable ChangeStreamDocument<Document> raw;
private final Class<T> targetType;
private final MongoConverter converter;
// accessed through CONVERTED_FULL_DOCUMENT_UPDATER.
private volatile @Nullable T convertedFullDocument;
// accessed through CONVERTED_FULL_DOCUMENT_BEFORE_CHANGE_UPDATER.
private volatile @Nullable T convertedFullDocumentBeforeChange;
/**
* @param raw can be {@literal null}.
* @param targetType must not be {@literal null}.
* @param converter must not be {@literal null}.
*/
public ChangeStreamEvent(@Nullable ChangeStreamDocument<Document> raw, Class<T> targetType,
MongoConverter converter) {
this.raw = raw;
this.targetType = targetType;
this.converter = converter;
}
/**
* Get the raw {@link ChangeStreamDocument} as emitted by the driver.
*
* @return can be {@literal null}.
*/
@Nullable
public ChangeStreamDocument<Document> getRaw() {
return raw;
}
/**
* Get the {@link ChangeStreamDocument#getClusterTime() cluster time} as {@link Instant} the event was emitted at.
*
* @return can be {@literal null}.
*/
@Nullable
public Instant getTimestamp() {
return getBsonTimestamp() != null ? converter.getConversionService().convert(raw.getClusterTime(), Instant.class)
: null;
}
/**
* Get the {@link ChangeStreamDocument#getClusterTime() cluster time}.
*
* @return can be {@literal null}.
* @since 2.2
*/
@Nullable
public BsonTimestamp getBsonTimestamp() {
return raw != null ? raw.getClusterTime() : null;
}
/**
* Get the {@link ChangeStreamDocument#getResumeToken() resume token} for this event.
*
* @return can be {@literal null}.
*/
@Nullable
public BsonValue getResumeToken() {
return raw != null ? raw.getResumeToken() : null;
}
/**
* Get the {@link ChangeStreamDocument#getOperationType() operation type} for this event.
*
* @return can be {@literal null}.
*/
@Nullable
public OperationType getOperationType() {
return raw != null ? raw.getOperationType() : null;
}
/**
* Get the database name the event was originated at.
*
* @return can be {@literal null}.
*/
@Nullable
public String getDatabaseName() {
return raw != null ? raw.getNamespace().getDatabaseName() : null;
}
/**
* Get the collection name the event was originated at.
*
* @return can be {@literal null}.
*/
@Nullable
public String getCollectionName() {
return raw != null ? raw.getNamespace().getCollectionName() : null;
}
/**
* Get the potentially converted {@link ChangeStreamDocument#getFullDocument()}.
*
* @return {@literal null} when {@link #getRaw()} or {@link ChangeStreamDocument#getFullDocument()} is
* {@literal null}.
*/
@Nullable
public T getBody() {
if (raw == null || raw.getFullDocument() == null) {
return null;
}
return getConvertedFullDocument(raw.getFullDocument());
}
@Nullable
public T getBodyBeforeChange() {
if (raw == null || raw.getFullDocumentBeforeChange() == null) {
return null;
}
return getConvertedFullDocumentBeforeChange(raw.getFullDocumentBeforeChange());
}
@SuppressWarnings("unchecked")
private T getConvertedFullDocumentBeforeChange(Document fullDocument) {
return (T) doGetConverted(fullDocument, CONVERTED_FULL_DOCUMENT_BEFORE_CHANGE_UPDATER);
}
@SuppressWarnings("unchecked")
private T getConvertedFullDocument(Document fullDocument) {
return (T) doGetConverted(fullDocument, CONVERTED_FULL_DOCUMENT_UPDATER);
}
private Object doGetConverted(Document fullDocument, AtomicReferenceFieldUpdater<ChangeStreamEvent, Object> updater) {
Object result = updater.get(this);
if (result != null) {
return result;
}
if (ClassUtils.isAssignable(Document.class, fullDocument.getClass())) {
result = converter.read(targetType, fullDocument);
return updater.compareAndSet(this, null, result) ? result : updater.get(this);
}
if (converter.getConversionService().canConvert(fullDocument.getClass(), targetType)) {
result = converter.getConversionService().convert(fullDocument, targetType);
return updater.compareAndSet(this, null, result) ? result : updater.get(this);
}
throw new IllegalArgumentException(
String.format("No converter found capable of converting %s to %s", fullDocument.getClass(), targetType));
}
@Override
public String toString() {
return "ChangeStreamEvent {" + "raw=" + raw + ", targetType=" + targetType + '}';
}
@Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
ChangeStreamEvent<?> that = (ChangeStreamEvent<?>) o;
if (!ObjectUtils.nullSafeEquals(this.raw, that.raw)) {
return false;
}
return ObjectUtils.nullSafeEquals(this.targetType, that.targetType);
}
@Override
public int hashCode() {
int result = raw != null ? raw.hashCode() : 0;
result = 31 * result + ObjectUtils.nullSafeHashCode(targetType);
return result;
}
}