-
-
Notifications
You must be signed in to change notification settings - Fork 6.2k
/
Broadcaster.ts
340 lines (311 loc) · 16.1 KB
/
Broadcaster.ts
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
332
333
334
335
336
337
338
339
340
import {EntitySubscriberInterface} from "./EntitySubscriberInterface";
import {ObjectLiteral} from "../common/ObjectLiteral";
import {QueryRunner} from "../query-runner/QueryRunner";
import {EntityMetadata} from "../metadata/EntityMetadata";
import {BroadcasterResult} from "./BroadcasterResult";
import {ColumnMetadata} from "../metadata/ColumnMetadata";
import {RelationMetadata} from "../metadata/RelationMetadata";
/**
* Broadcaster provides a helper methods to broadcast events to the subscribers.
*/
export class Broadcaster {
// -------------------------------------------------------------------------
// Constructor
// -------------------------------------------------------------------------
constructor(private queryRunner: QueryRunner) {
}
// -------------------------------------------------------------------------
// Public Methods
// -------------------------------------------------------------------------
/**
* Broadcasts "BEFORE_INSERT" event.
* Before insert event is executed before entity is being inserted to the database for the first time.
* All subscribers and entity listeners who listened to this event will be executed at this point.
* Subscribers and entity listeners can return promises, it will wait until they are resolved.
*
* Note: this method has a performance-optimized code organization, do not change code structure.
*/
broadcastBeforeInsertEvent(result: BroadcasterResult, metadata: EntityMetadata, entity?: ObjectLiteral): void {
if (entity && metadata.beforeInsertListeners.length) {
metadata.beforeInsertListeners.forEach(listener => {
if (listener.isAllowed(entity)) {
const executionResult = listener.execute(entity);
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
if (this.queryRunner.connection.subscribers.length) {
this.queryRunner.connection.subscribers.forEach(subscriber => {
if (this.isAllowedSubscriber(subscriber, metadata.target) && subscriber.beforeInsert) {
const executionResult = subscriber.beforeInsert({
connection: this.queryRunner.connection,
queryRunner: this.queryRunner,
manager: this.queryRunner.manager,
entity: entity,
metadata: metadata
});
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
}
/**
* Broadcasts "BEFORE_UPDATE" event.
* Before update event is executed before entity is being updated in the database.
* All subscribers and entity listeners who listened to this event will be executed at this point.
* Subscribers and entity listeners can return promises, it will wait until they are resolved.
*
* Note: this method has a performance-optimized code organization, do not change code structure.
*/
broadcastBeforeUpdateEvent(result: BroadcasterResult, metadata: EntityMetadata, entity?: ObjectLiteral, databaseEntity?: ObjectLiteral, updatedColumns?: ColumnMetadata[], updatedRelations?: RelationMetadata[]): void { // todo: send relations too?
if (entity && metadata.beforeUpdateListeners.length) {
metadata.beforeUpdateListeners.forEach(listener => {
if (listener.isAllowed(entity)) {
const executionResult = listener.execute(entity);
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
if (this.queryRunner.connection.subscribers.length) {
this.queryRunner.connection.subscribers.forEach(subscriber => {
if (this.isAllowedSubscriber(subscriber, metadata.target) && subscriber.beforeUpdate) {
const executionResult = subscriber.beforeUpdate({
connection: this.queryRunner.connection,
queryRunner: this.queryRunner,
manager: this.queryRunner.manager,
entity: entity,
metadata: metadata,
databaseEntity: databaseEntity,
updatedColumns: updatedColumns || [],
updatedRelations: updatedRelations || []
});
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
}
/**
* Broadcasts "BEFORE_REMOVE" event.
* Before remove event is executed before entity is being removed from the database.
* All subscribers and entity listeners who listened to this event will be executed at this point.
* Subscribers and entity listeners can return promises, it will wait until they are resolved.
*
* Note: this method has a performance-optimized code organization, do not change code structure.
*/
broadcastBeforeRemoveEvent(result: BroadcasterResult, metadata: EntityMetadata, entity?: ObjectLiteral, databaseEntity?: ObjectLiteral): void {
if (entity && metadata.beforeRemoveListeners.length) {
metadata.beforeRemoveListeners.forEach(listener => {
if (listener.isAllowed(entity)) {
const executionResult = listener.execute(entity);
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
if (this.queryRunner.connection.subscribers.length) {
this.queryRunner.connection.subscribers.forEach(subscriber => {
if (this.isAllowedSubscriber(subscriber, metadata.target) && subscriber.beforeRemove) {
const executionResult = subscriber.beforeRemove({
connection: this.queryRunner.connection,
queryRunner: this.queryRunner,
manager: this.queryRunner.manager,
entity: entity,
metadata: metadata,
databaseEntity: databaseEntity,
entityId: metadata.getEntityIdMixedMap(databaseEntity)
});
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
}
/**
* Broadcasts "AFTER_INSERT" event.
* After insert event is executed after entity is being persisted to the database for the first time.
* All subscribers and entity listeners who listened to this event will be executed at this point.
* Subscribers and entity listeners can return promises, it will wait until they are resolved.
*
* Note: this method has a performance-optimized code organization, do not change code structure.
*/
broadcastAfterInsertEvent(result: BroadcasterResult, metadata: EntityMetadata, entity?: ObjectLiteral): void {
if (entity && metadata.afterInsertListeners.length) {
metadata.afterInsertListeners.forEach(listener => {
if (listener.isAllowed(entity)) {
const executionResult = listener.execute(entity);
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
if (this.queryRunner.connection.subscribers.length) {
this.queryRunner.connection.subscribers.forEach(subscriber => {
if (this.isAllowedSubscriber(subscriber, metadata.target) && subscriber.afterInsert) {
const executionResult = subscriber.afterInsert({
connection: this.queryRunner.connection,
queryRunner: this.queryRunner,
manager: this.queryRunner.manager,
entity: entity,
metadata: metadata
});
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
}
/**
* Broadcasts "AFTER_UPDATE" event.
* After update event is executed after entity is being updated in the database.
* All subscribers and entity listeners who listened to this event will be executed at this point.
* Subscribers and entity listeners can return promises, it will wait until they are resolved.
*
* Note: this method has a performance-optimized code organization, do not change code structure.
*/
broadcastAfterUpdateEvent(result: BroadcasterResult, metadata: EntityMetadata, entity?: ObjectLiteral, databaseEntity?: ObjectLiteral, updatedColumns?: ColumnMetadata[], updatedRelations?: RelationMetadata[]): void {
if (entity && metadata.afterUpdateListeners.length) {
metadata.afterUpdateListeners.forEach(listener => {
if (listener.isAllowed(entity)) {
const executionResult = listener.execute(entity);
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
if (this.queryRunner.connection.subscribers.length) {
this.queryRunner.connection.subscribers.forEach(subscriber => {
if (this.isAllowedSubscriber(subscriber, metadata.target) && subscriber.afterUpdate) {
const executionResult = subscriber.afterUpdate({
connection: this.queryRunner.connection,
queryRunner: this.queryRunner,
manager: this.queryRunner.manager,
entity: entity,
metadata: metadata,
databaseEntity: databaseEntity,
updatedColumns: updatedColumns || [],
updatedRelations: updatedRelations || []
});
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
}
/**
* Broadcasts "AFTER_REMOVE" event.
* After remove event is executed after entity is being removed from the database.
* All subscribers and entity listeners who listened to this event will be executed at this point.
* Subscribers and entity listeners can return promises, it will wait until they are resolved.
*
* Note: this method has a performance-optimized code organization, do not change code structure.
*/
broadcastAfterRemoveEvent(result: BroadcasterResult, metadata: EntityMetadata, entity?: ObjectLiteral, databaseEntity?: ObjectLiteral): void {
if (entity && metadata.afterRemoveListeners.length) {
metadata.afterRemoveListeners.forEach(listener => {
if (listener.isAllowed(entity)) {
const executionResult = listener.execute(entity);
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
if (this.queryRunner.connection.subscribers.length) {
this.queryRunner.connection.subscribers.forEach(subscriber => {
if (this.isAllowedSubscriber(subscriber, metadata.target) && subscriber.afterRemove) {
const executionResult = subscriber.afterRemove({
connection: this.queryRunner.connection,
queryRunner: this.queryRunner,
manager: this.queryRunner.manager,
entity: entity,
metadata: metadata,
databaseEntity: databaseEntity,
entityId: metadata.getEntityIdMixedMap(databaseEntity)
});
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
}
/**
* Broadcasts "AFTER_LOAD" event for all given entities, and their sub-entities.
* After load event is executed after entity has been loaded from the database.
* All subscribers and entity listeners who listened to this event will be executed at this point.
* Subscribers and entity listeners can return promises, it will wait until they are resolved.
*
* Note: this method has a performance-optimized code organization, do not change code structure.
*/
broadcastLoadEventsForAll(result: BroadcasterResult, metadata: EntityMetadata, entities: ObjectLiteral[]): void {
entities.forEach(entity => {
if (entity instanceof Promise) // todo: check why need this?
return;
// collect load events for all children entities that were loaded with the main entity
if (metadata.relations.length) {
metadata.relations.forEach(relation => {
// in lazy relations we cannot simply access to entity property because it will cause a getter and a database query
if (relation.isLazy && !entity.hasOwnProperty(relation.propertyName))
return;
const value = relation.getEntityValue(entity);
if (value instanceof Object)
this.broadcastLoadEventsForAll(result, relation.inverseEntityMetadata, value instanceof Array ? value : [value]);
});
}
if (metadata.afterLoadListeners.length) {
metadata.afterLoadListeners.forEach(listener => {
if (listener.isAllowed(entity)) {
const executionResult = listener.execute(entity);
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
if (this.queryRunner.connection.subscribers.length) {
this.queryRunner.connection.subscribers.forEach(subscriber => {
if (this.isAllowedSubscriber(subscriber, metadata.target) && subscriber.afterLoad) {
const executionResult = subscriber.afterLoad!(entity, {
connection: this.queryRunner.connection,
queryRunner: this.queryRunner,
manager: this.queryRunner.manager,
entity: entity,
metadata: metadata
});
if (executionResult instanceof Promise)
result.promises.push(executionResult);
result.count++;
}
});
}
});
}
// -------------------------------------------------------------------------
// Protected Methods
// -------------------------------------------------------------------------
/**
* Checks if subscriber's methods can be executed by checking if its don't listen to the particular entity,
* or listens our entity.
*/
protected isAllowedSubscriber(subscriber: EntitySubscriberInterface<any>, target: Function|string): boolean {
return !subscriber.listenTo ||
!subscriber.listenTo() ||
subscriber.listenTo() === Object ||
subscriber.listenTo() === target ||
subscriber.listenTo().isPrototypeOf(target);
}
}