Subversion Repositories Applications.papyrus

/*
        Copyright (c) 2004-2006, The Dojo Foundation
        All Rights Reserved.

        Licensed under the Academic Free License version 2.1 or above OR the
        modified BSD license. For more information on Dojo licensing, see:

                http://dojotoolkit.org/community/licensing.shtml
*/



dojo.provide("dojo.lang.timing.Streamer");
dojo.require("dojo.lang.timing.Timer");
dojo.lang.timing.Streamer = function (input, output, interval, minimum, initialData) {
        var self = this;
        var queue = [];
        this.interval = interval || 1000;
        this.minimumSize = minimum || 10;
        this.inputFunction = input || function (q) {
        };
        this.outputFunction = output || function (point) {
        };
        var timer = new dojo.lang.timing.Timer(this.interval);
        var tick = function () {
                self.onTick(self);
                if (queue.length < self.minimumSize) {
                        self.inputFunction(queue);
                }
                var obj = queue.shift();
                while (typeof (obj) == "undefined" && queue.length > 0) {
                        obj = queue.shift();
                }
                if (typeof (obj) == "undefined") {
                        self.stop();
                        return;
                }
                self.outputFunction(obj);
        };
        this.setInterval = function (ms) {
                this.interval = ms;
                timer.setInterval(ms);
        };
        this.onTick = function (obj) {
        };
        this.start = function () {
                if (typeof (this.inputFunction) == "function" && typeof (this.outputFunction) == "function") {
                        timer.start();
                        return;
                }
                dojo.raise("You cannot start a Streamer without an input and an output function.");
        };
        this.onStart = function () {
        };
        this.stop = function () {
                timer.stop();
        };
        this.onStop = function () {
        };
        timer.onTick = this.tick;
        timer.onStart = this.onStart;
        timer.onStop = this.onStop;
        if (initialData) {
                queue.concat(initialData);
        }
};