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6-class.js
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'use strict';
const assert = require('node:assert').strict;
const { EventEmitter } = require('node:events');
class Task extends EventEmitter {
constructor(name, time, exec) {
super();
this.name = name;
if (typeof time === 'number') {
this.time = Date.now() + time;
this.set = setInterval;
this.clear = clearInterval;
} else {
this.time = new Date(time).getTime();
this.set = setTimeout;
this.clear = clearTimeout;
}
this.exec = exec;
this.running = false;
this.count = 0;
this.timer = null;
}
get active() {
return !!this.timer;
}
start() {
this.stop();
if (this.running) return false;
const time = this.time - Date.now();
if (time < 0) return false;
this.timer = this.set(() => {
this.run();
}, time);
return true;
}
stop() {
if (!this.active || this.running) return false;
this.clear(this.timer);
this.timer = null;
return true;
}
run() {
if (!this.active || this.running) return false;
this.running = true;
this.exec((err) => {
if (err) this.emit('error', err, this);
this.count++;
this.running = false;
});
return true;
}
}
class Scheduler extends EventEmitter {
constructor() {
super();
this.tasks = new Map();
}
task(name, time, exec) {
this.stop(name);
const task = new Task(name, time, exec);
this.tasks.set(name, task);
task.on('error', (err) => {
this.emit('error', err, task);
});
task.start();
return task;
}
stop(name) {
const task = this.tasks.get(name);
if (task) {
task.stop();
this.tasks.delete(name);
}
}
stopAll() {
for (const name of this.tasks.keys()) {
this.stop(name);
}
}
}
// Tests
const testCreateTask = (next) => {
const timer = setTimeout(() => {
const err = new Error('Can not create task');
assert.fail(err);
next(err);
}, 200);
const scheduler = new Scheduler();
scheduler.task('name1', '2019-04-16T18:30Z', (done) => {
done(null, 'task successed');
});
let error = null;
try {
assert.strictEqual(scheduler.tasks.size, 1);
} catch (err) {
error = err;
} finally {
clearTimeout(timer);
next(error);
}
};
const testExecuteTask = (next) => {
const timer = setTimeout(() => {
const err = new Error('Can not execute task');
assert.fail(err);
next(err);
}, 200);
const scheduler = new Scheduler();
scheduler.task('name1', 100, (done) => {
let error = null;
try {
assert.ok(scheduler.tasks.get('name1').running);
} catch (err) {
error = err;
}
clearTimeout(timer);
done(null, 'task successed');
scheduler.stopAll();
next(error);
});
};
const testFailedTask = (next) => {
const timer = setTimeout(() => {
const err = new Error('Task expected to fail');
assert.fail(err);
next(err);
}, 200);
const scheduler = new Scheduler();
scheduler.task('name1', 100, (done) => {
done(new Error('Task failed'));
});
scheduler.on('error', (err, task) => {
let error = null;
try {
assert.ok(task.running);
assert.strictEqual(err.message, 'Task failed');
} catch (err) {
error = err;
}
clearTimeout(timer);
scheduler.stopAll();
next(error);
});
};
// Execute tests
const tests = [
testCreateTask,
testExecuteTask,
testFailedTask,
];
let failed = 0;
const count = tests.length;
const runNext = () => {
if (tests.length === 0) {
console.log(`Total: ${count}; Failed: ${failed}`);
process.exit(failed > 0 ? 1 : 0);
}
const test = tests.shift();
console.log(`Started test: ${test.name}`);
try {
test((err) => {
if (err) {
failed++;
console.log(`Failed test: ${test.name}`);
console.log(err);
}
console.log(`Finished test: ${test.name}`);
setTimeout(runNext, 0);
});
} catch (err) {
failed++;
console.log(`Failed test: ${test.name}`);
console.log(err);
setTimeout(runNext, 0);
}
};
runNext();