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test.js
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test.js
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/* eslint-disable no-console */
'use strict';
const curtain = require('curtain-down');
const taskStream = require('./index');
const reader = {
delay: 300,
readAhead: 3,
failAfter: Infinity
};
const writer = {
delay: 800,
parallelTasks: 2,
failAfter: Infinity
};
let getTaskId = 0;
const getTask = (callback) => {
getTaskId += 1;
const error = getTaskId > reader.failAfter
? new Error('Read Error')
: null;
setTimeout(callback, reader.delay, error, {id: getTaskId});
};
let processTaskId = 0;
const processTask = (task, callback) => {
processTaskId += 1;
const error = processTaskId > writer.failAfter
? new Error('Process Error')
: null;
setTimeout(callback, writer.delay, error);
};
const worker = taskStream(
getTask,
processTask,
{
readAhead: reader.readAhead,
parallelTasks: writer.parallelTasks,
onReadError: (error) => console.log('failed to get task'),
onWriteError: (error) => console.log('failed to process task', error.task),
onError: (error) => {
console.log('Some kind of error');
},
onFinish: console.log.bind(console, 'Done!')
}
);
worker.start();
curtain(worker.stop.bind(worker));