1// Copyright Joyent, Inc. and other Node contributors. 2// 3// Permission is hereby granted, free of charge, to any person obtaining a 4// copy of this software and associated documentation files (the 5// "Software"), to deal in the Software without restriction, including 6// without limitation the rights to use, copy, modify, merge, publish, 7// distribute, sublicense, and/or sell copies of the Software, and to permit 8// persons to whom the Software is furnished to do so, subject to the 9// following conditions: 10// 11// The above copyright notice and this permission notice shall be included 12// in all copies or substantial portions of the Software. 13// 14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 20// USE OR OTHER DEALINGS IN THE SOFTWARE. 21 22'use strict'; 23require('../common'); 24const assert = require('assert'); 25 26const Readable = require('stream').Readable; 27 28class MyStream extends Readable { 29 constructor(options) { 30 super(options); 31 this._chunks = 3; 32 } 33 34 _read(n) { 35 switch (this._chunks--) { 36 case 0: 37 return this.push(null); 38 case 1: 39 return setTimeout(() => { 40 this.push('last chunk'); 41 }, 100); 42 case 2: 43 return this.push('second to last chunk'); 44 case 3: 45 return process.nextTick(() => { 46 this.push('first chunk'); 47 }); 48 default: 49 throw new Error('?'); 50 } 51 } 52} 53 54const ms = new MyStream(); 55const results = []; 56ms.on('readable', function() { 57 let chunk; 58 while (null !== (chunk = ms.read())) 59 results.push(String(chunk)); 60}); 61 62const expect = [ 'first chunksecond to last chunk', 'last chunk' ]; 63process.on('exit', function() { 64 assert.strictEqual(ms._chunks, -1); 65 assert.deepStrictEqual(results, expect); 66 console.log('ok'); 67}); 68