mirror of https://gitee.com/openkylin/nodejs.git
113 lines
2.4 KiB
JavaScript
113 lines
2.4 KiB
JavaScript
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const stream = require('stream');
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let state = 0;
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/*
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What you do
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const stream = new stream.Transform({
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transform: function transformCallback(chunk, _, next) {
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// part 1
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this.push(chunk);
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//part 2
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next();
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},
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final: function endCallback(done) {
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// part 1
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process.nextTick(function () {
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// part 2
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done();
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});
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},
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flush: function flushCallback(done) {
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// part 1
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process.nextTick(function () {
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// part 2
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done();
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});
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}
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});
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t.on('data', dataListener);
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t.on('end', endListener);
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t.on('finish', finishListener);
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t.write(1);
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t.write(4);
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t.end(7, endMethodCallback);
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The order things are called
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1. transformCallback part 1
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2. dataListener
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3. transformCallback part 2
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4. transformCallback part 1
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5. dataListener
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6. transformCallback part 2
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7. transformCallback part 1
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8. dataListener
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9. transformCallback part 2
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10. finalCallback part 1
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11. finalCallback part 2
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12. flushCallback part 1
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13. finishListener
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14. endMethodCallback
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15. flushCallback part 2
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16. endListener
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*/
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const t = new stream.Transform({
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objectMode: true,
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transform: common.mustCall(function(chunk, _, next) {
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// transformCallback part 1
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assert.strictEqual(++state, chunk);
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this.push(state);
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// transformCallback part 2
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assert.strictEqual(++state, chunk + 2);
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process.nextTick(next);
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}, 3),
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final: common.mustCall(function(done) {
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state++;
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// finalCallback part 1
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assert.strictEqual(state, 10);
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setTimeout(function() {
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state++;
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// finalCallback part 2
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assert.strictEqual(state, 11);
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done();
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}, 100);
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}, 1),
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flush: common.mustCall(function(done) {
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state++;
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// flushCallback part 1
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assert.strictEqual(state, 12);
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process.nextTick(function() {
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state++;
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// flushCallback part 2
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assert.strictEqual(state, 15);
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done();
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});
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}, 1)
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});
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t.on('finish', common.mustCall(function() {
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state++;
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// finishListener
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assert.strictEqual(state, 13);
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}, 1));
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t.on('end', common.mustCall(function() {
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state++;
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// end event
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assert.strictEqual(state, 16);
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}, 1));
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t.on('data', common.mustCall(function(d) {
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// dataListener
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assert.strictEqual(++state, d + 1);
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}, 3));
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t.write(1);
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t.write(4);
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t.end(7, common.mustCall(function() {
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state++;
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// endMethodCallback
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assert.strictEqual(state, 14);
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}, 1));
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