/*
demo:
var observer = function(paramObj){
alert("bomb event comes!" + paramObj);
}
//add business event listener
EventBus.subscribe("tree-node-change",observer);
//remove business event listener
//EventBus.unsubscribe("tree-node-change",observer);
//publish business event
EventBus.publish("tree-node-change",{oldName:"abc", newName:"cdef", id: 123});
*/
/*
ReadMe:
Goal: Using business event dispatcher to reduce code couple between web moudle,
目标: 为了尽可能的减少模块之间业务逻辑的耦合度, 而开发了这个消息总线, 主要用于业务逻辑的事件传递
目标: 为了尽可能的减少模块之间业务逻辑的耦合度, 而开发了这个消息总线, 主要用于业务逻辑的事件传递
使用规范: 每个js模块尽可能通过事件去通信, 减少模块之间的直接调用和依赖(耦合)
*/
var EventBus = function(){
var observers={};
var publish=function(eventName, argObj){
var obs = observers[eventName];
if(!obs){
return;
}
for(var i=0;i<obs.length;i++){
obs[i](argObj);
}
}
var subscribe=function(eventName, observer){
var obs = observers[eventName];
if(!obs){
obs=[];
observers[eventName]=obs;
}
obs.push(observer);
}
var unsubscribe=function(eventName, observer){
var obs = observers[eventName];
if(!obs){
return;
}
for(var i=0;i<obs.length;i++){
if(obs[i]==observer){
obs.splice(i,1);
break;
}
}
}
var unsubscribeByObserver=function(observer){
for(var eventName in observers){
removeByName(eventName, observer);
}
}
return {
publish:publish,
subscribe:subscribe,
unsubscribe:unsubscribe,
subscribeByObserver:unsubscribeByObserver
}
}();
Posts
