File size: 1,167 Bytes
bc20498 |
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 |
let nextHandle = 1;
// The promise needs to be created lazily otherwise it won't be patched by Zones
let resolved: Promise<any>;
const activeHandles: { [key: number]: any } = {};
/**
* Finds the handle in the list of active handles, and removes it.
* Returns `true` if found, `false` otherwise. Used both to clear
* Immediate scheduled tasks, and to identify if a task should be scheduled.
*/
function findAndClearHandle(handle: number): boolean {
if (handle in activeHandles) {
delete activeHandles[handle];
return true;
}
return false;
}
/**
* Helper functions to schedule and unschedule microtasks.
*/
export const Immediate = {
setImmediate(cb: () => void): number {
const handle = nextHandle++;
activeHandles[handle] = true;
if (!resolved) {
resolved = Promise.resolve();
}
resolved.then(() => findAndClearHandle(handle) && cb());
return handle;
},
clearImmediate(handle: number): void {
findAndClearHandle(handle);
},
};
/**
* Used for internal testing purposes only. Do not export from library.
*/
export const TestTools = {
pending() {
return Object.keys(activeHandles).length;
}
};
|