angular-cn/packages/zone.js/lib/zone-spec/task-tracking.ts

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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* A `TaskTrackingZoneSpec` allows one to track all outstanding Tasks.
*
* This is useful in tests. For example to see which tasks are preventing a test from completing
* or an automated way of releasing all of the event listeners at the end of the test.
*/
class TaskTrackingZoneSpec implements ZoneSpec {
name = 'TaskTrackingZone';
microTasks: Task[] = [];
macroTasks: Task[] = [];
eventTasks: Task[] = [];
properties: {[key: string]: any} = {'TaskTrackingZone': this};
static get() { return Zone.current.get('TaskTrackingZone'); }
private getTasksFor(type: string): Task[] {
switch (type) {
case 'microTask':
return this.microTasks;
case 'macroTask':
return this.macroTasks;
case 'eventTask':
return this.eventTasks;
}
throw new Error('Unknown task format: ' + type);
}
onScheduleTask(parentZoneDelegate: ZoneDelegate, currentZone: Zone, targetZone: Zone, task: Task):
Task {
(task as any)['creationLocation'] = new Error(`Task '${task.type}' from '${task.source}'.`);
const tasks = this.getTasksFor(task.type);
tasks.push(task);
return parentZoneDelegate.scheduleTask(targetZone, task);
}
onCancelTask(parentZoneDelegate: ZoneDelegate, currentZone: Zone, targetZone: Zone, task: Task):
any {
const tasks = this.getTasksFor(task.type);
for (let i = 0; i < tasks.length; i++) {
if (tasks[i] == task) {
tasks.splice(i, 1);
break;
}
}
return parentZoneDelegate.cancelTask(targetZone, task);
}
onInvokeTask(
parentZoneDelegate: ZoneDelegate, currentZone: Zone, targetZone: Zone, task: Task,
applyThis: any, applyArgs: any): any {
if (task.type === 'eventTask')
return parentZoneDelegate.invokeTask(targetZone, task, applyThis, applyArgs);
const tasks = this.getTasksFor(task.type);
for (let i = 0; i < tasks.length; i++) {
if (tasks[i] == task) {
tasks.splice(i, 1);
break;
}
}
return parentZoneDelegate.invokeTask(targetZone, task, applyThis, applyArgs);
}
clearEvents() {
while (this.eventTasks.length) {
Zone.current.cancelTask(this.eventTasks[0]);
}
}
}
// Export the class so that new instances can be created with proper
// constructor params.
(Zone as any)['TaskTrackingZoneSpec'] = TaskTrackingZoneSpec;