新浪微博的Jobs运作任务

新浪微博的Jobs运行任务

function Jobs() {
		    this._jobTable = []
		}
		Jobs.prototype = {
		    _registedJobTable: {},
		    initialize: function() {},
		    _registJob: function(jobName, rel) {
		        this._registedJobTable[jobName] = rel
		    },
		    add: function(jobName) {
		        this._jobTable.push(jobName)
		    },
		    start: function() {
		        var jobs = this._jobTable;
		        var regJobs = this._registedJobTable;
		        var i = 0;
		        var joblen = this._jobTable.length;
		        var getTime = function() {
		            return new Date().valueOf()
		        };
		        var interNum = window.setInterval(function() {
		            if (i >= joblen) {
		                clearInterval(interNum);
		                return
		            }
		            var jobName = jobs[i];
		            var job = regJobs[jobName];
		            i++;
		            if (typeof job == "undefined") {
		                console.log("<b>[" + jobName + "# is undefiend!!!</b>", {
		                    html: true
		                });
		                return
		            }
		            var _try = true;
		            var _start = getTime();
		            try {
		                job.call()
		            } catch(e) {
		                console.log("<b>[" + jobName + "] failed!!!</b>", {
		                    html: true
		                });
		                _try = false
		            } finally {
		                if (_try) {
		                    var _end = getTime();
		                    console.log("[" + jobName + "] done in " + (_end - _start) + "ms.")
		                }
		            }
		        },
		        10)
		    },
		    call: function(jobName, args) {
		        if (typeof this._registedJobTable[jobName] != "undefined") {
		            this._registedJobTable[jobName].apply(this, args)
		        } else {
		            console.log("#" + jobName + "# is undefined!!!", {
		                color: "#900",
		                bgColor: "#FFF;"
		            })
		        }
		    }
		};
		$registJob = function(name, rel) {
		    Jobs.prototype._registJob(name, rel)
		};

 

测试用例：

$registJob('topic' , function() {
			for(var i = 0 ; i < 10000000 ; i++) {
				var arr = new Array(10000);
			}
			alert('function1 ends');
		});
		$registJob('loadComment' , function() {
			for(var i = 0 ; i < 100000 ; i++) {
				var arr = new Array(10000);
			}
			alert('function2 ends');
		});
		$registJob('testFun' , function() {
			for(var i = 0 ; i < 100000 ; i++) {
				var arr = new Array(10000);
			}
			alert('function3 ends');
		});
		function main() {
			var jobs = new Jobs();
			jobs.add("topic");
			jobs.add("loadComment");
			jobs.add('aaa');
			jobs.start();
		};
		window.onload = main;

 按照任务的方式来使制定的代码运行，巧妙的地方在于使用了setInterval,将函数的运行放到了不同的闭包中，如果其中的一个函数出了错，不会影响到其他的函数继续运行，其中添加了日志处理，记录下来每个job运行了多长时间。