6a9ffbcc
 liuqimichale
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/**
* @file async-stream.js
*/
import Stream from './stream';
/**
* A wrapper around the Stream class to use setTiemout
* and run stream "jobs" Asynchronously
*
* @class AsyncStream
* @extends Stream
*/
export default class AsyncStream extends Stream {
constructor() {
super(Stream);
this.jobs = [];
this.delay = 1;
this.timeout_ = null;
}
/**
* process an async job
*
* @private
*/
processJob_() {
this.jobs.shift()();
if (this.jobs.length) {
this.timeout_ = setTimeout(this.processJob_.bind(this),
this.delay);
} else {
this.timeout_ = null;
}
}
/**
* push a job into the stream
*
* @param {Function} job the job to push into the stream
*/
push(job) {
this.jobs.push(job);
if (!this.timeout_) {
this.timeout_ = setTimeout(this.processJob_.bind(this),
this.delay);
}
}
}
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