chronosjs
Version:
JS Channels Mechanism
195 lines (180 loc) • 7.54 kB
JavaScript
;(function (root, factory) {
"use strict";
/* istanbul ignore if */
//<amd>
if ("function" === typeof define && define.amd) {
// AMD. Register as an anonymous module.
define("Chronos.Commands", ["Chronos.EventsUtil", "Chronos.CommandsUtil"], function (EventsUtil, CommandsUtil) {
return factory(root, root, EventsUtil, CommandsUtil, true);
});
return;
}
//</amd>
/* istanbul ignore next */
if ("object" === typeof exports) {
// CommonJS
factory(root, exports, require("./util/EventsUtil").EventsUtil, require("./util/CommandsUtil").CommandsUtil);
}
/* istanbul ignore next */
else {
/**
* @depend ./util/EventsUtil.js
* @depend ./util/CommandsUtil.js
*/
// Browser globals
root.Chronos = root.Chronos || {};
factory(root, root.Chronos, root.Chronos.EventsUtil, root.Chronos.CommandsUtil);
}
}(typeof ChronosRoot === "undefined" ? this : ChronosRoot, function (root, exports, evUtil, cmdUtil, hide) {
"use strict";
function Commands(defaults) {
var appName = "Commands",
attrName = "cmdName",
commandId = 0,
commands = {},
fired = [],
prefix = "cmdId_",
indexer = 0,
cloneData,
eventBufferLimit,
defaultAppName;
defaultAppName = defaults && defaults.appName || "*";
cloneData = (defaults && typeof defaults.cloneEventData === "boolean" ? defaults.cloneEventData : false);
eventBufferLimit = (defaults && !isNaN(defaults.eventBufferLimit) ? defaults.eventBufferLimit : -1);
/**
* This function allows registering for command with the following structure:
* @param cmd = {
* cmdName: string that is the name of the event that will be triggered like 'get'
* appName: string that specifies an added identifier for multiple instances of the same event name (click by button1, click by button 2)
* func: function - the callback function which the event data will be passed to
* context: the context which the event data will be run with
* }
*
* @return {String} - command Id.
*/
function comply(cmd) {
if ("*" !== defaultAppName) {
cmd.appName = cmd.appName || defaultAppName;
}
return cmdUtil.bind({
cmd: cmd,
attrName: attrName,
loggerName: appName,
prefix: prefix,
id: commandId,
lstnrs: commands
});
}
/**
* This function allows unbinding according to a permutation of the three parameters
* @param unbindObj
* cmdName - the eventName you want to unbind
* func - the pointer to the function you want to unbind
* context - the context you want to unbind
* appName - the specific appName we want to unbind
* OR - commandId
* @return {Boolean} - has stopped complying.
*/
function stopComplying(unbindObj) {
if ("*" !== defaultAppName) {
unbindObj.appName = unbindObj.appName || defaultAppName;
}
return evUtil.unbind({
unbindObj: unbindObj,
attrName: attrName,
loggerName: appName,
lstnrs: commands
});
}
/**
* firedEventData can pass two request parameters
* @param app name
* @param cmdName = command name
* @return {Array}
*/
function hasFired(app, cmdName) {
if ("undefined" === typeof cmdName) {
cmdName = app;
app = defaultAppName;
}
return evUtil.hasFired(fired, app, cmdName);
}
/**
* This triggers a command
* @param cmd = {
* cmdName - the name of the command triggered
* appName - optional specifies the identifier it is bound to
* passDataByRef: boolean flag whether this callback will get the reference information of the event or a copy (this allows control of data manipulation)
* data - optional event parameters to be passed to the listeners
* }
*
* @param cb - optional callback to notify when finished
* @return {*}
*/
function command(cmd, cb) {
if (!cmd || typeof (cmd.cmdName) === "undefined" || !cmdUtil.valid(cmd, cmd.cmdName)) {
evUtil.log("CMD name not spec for command", "ERROR", "Commands");
return null;
}
if ("*" !== defaultAppName) {
cmd.appName = cmd.appName || defaultAppName;
}
cmd.passDataByRef = cmd.passDataByRef || !cloneData;
_storeEventData(cmd);
if (!commands[cmd.cmdName]) {
return false;
}
var callBacks = evUtil.getListeners(commands, cmd.cmdName, cmd.appName);
if (callBacks.length > 0) {
for (var j = 0; j < callBacks.length; j++) {
var cmdData = cmd.passDataByRef ? cmd.data : evUtil.cloneEventData(cmd.data);//Clone the event data if there was not an explicit request to passByRef
var callBack = callBacks[j];
try {
if ("function" === typeof cb) {
callBack.func.call(callBack.context, cmdData, cb);
} else {
callBack.func.call(callBack.context, cmdData);
}
cmdData = null;//Delete local pointer
callBack = null;
} catch (err) {
if ("function" === typeof cb) {
try {
cb(err);
} catch (e) {
evUtil.log("Error executing callback on error, " +cmd.cmdName + " commandId: " + callBack.id + "e=" + e.message, "ERROR", "Commands");
}
}
//noinspection JSUnresolvedVariable
evUtil.log("Error executing " + cmd.cmdName + " commandId: " + callBack.id + "e=" + err.message, "ERROR", "Commands");
}
}
}
return (callBacks.length > 0);
}
//------------------- Private methods ------------------------------//
/**
* Stores commands so we can later ask for them, can be set to a limited store by defaults on instantiation
* @param triggerData
*/
function _storeEventData(triggerData) {
evUtil.storeEventData({
triggerData: triggerData,
eventBufferLimit: eventBufferLimit,
attrName: attrName,
fired: fired,
index: indexer
});
}
this.hasFired = hasFired;
this.comply = comply;
this.stopComplying = stopComplying;
this.command = command;
}
// attach properties to the exports object to define
// the exported module properties.
if (!hide) {
exports.Commands = exports.Commands || Commands;
}
return Commands;
}));