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✏️ Editing: DataWorker.js

'use strict';

var utils = require('../utils');
var GenericWorker = require('./GenericWorker');

// the size of the generated chunks
// TODO expose this as a public variable
var DEFAULT_BLOCK_SIZE = 16 * 1024;

/**
 * A worker that reads a content and emits chunks.
 * @constructor
 * @param {Promise} dataP the promise of the data to split
 */
function DataWorker(dataP) {
    GenericWorker.call(this, "DataWorker");
    var self = this;
    this.dataIsReady = false;
    this.index = 0;
    this.max = 0;
    this.data = null;
    this.type = "";

this._tickScheduled = false;

dataP.then(function (data) {
        self.dataIsReady = true;
        self.data = data;
        self.max = data && data.length || 0;
        self.type = utils.getTypeOf(data);
        if(!self.isPaused) {
            self._tickAndRepeat();
        }
    }, function (e) {
        self.error(e);
    });
}

utils.inherits(DataWorker, GenericWorker);

/**
 * @see GenericWorker.cleanUp
 */
DataWorker.prototype.cleanUp = function () {
    GenericWorker.prototype.cleanUp.call(this);
    this.data = null;
};

/**
 * @see GenericWorker.resume
 */
DataWorker.prototype.resume = function () {
    if(!GenericWorker.prototype.resume.call(this)) {
        return false;
    }

if (!this._tickScheduled && this.dataIsReady) {
        this._tickScheduled = true;
        utils.delay(this._tickAndRepeat, [], this);
    }
    return true;
};

/**
 * Trigger a tick a schedule an other call to this function.
 */
DataWorker.prototype._tickAndRepeat = function() {
    this._tickScheduled = false;
    if(this.isPaused || this.isFinished) {
        return;
    }
    this._tick();
    if(!this.isFinished) {
        utils.delay(this._tickAndRepeat, [], this);
        this._tickScheduled = true;
    }
};

/**
 * Read and push a chunk.
 */
DataWorker.prototype._tick = function() {

if(this.isPaused || this.isFinished) {
        return false;
    }

module.exports = DataWorker;

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