Architecture Phase1 Week7:HomeWork

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发布于: 2020 年 11 月 08 日

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1.随着并发压力得增加，系统资源得变化如图所示
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一旦超过系统临界点，则无法响应请求，导致系统崩溃。
protocol urlTime{
getRespone(time:float,respones:string)
}
class query{
weak var delegate  : urlTime?
init(){
var time=0;
var url=NSURL(string:"http://www.baidu.com")
var request=NSURLRequest(URL:url)
var session =URLSession.sharedSession()
var now = NSDate()
var interval1 = tomorrow.timeIntervalSinceDate(now)
var task=session.dataTaskWithRequest(request){(data,respones,error) in
if(error==nil){
var now = NSDate()
var interval2 = tomorrow.timeIntervalSinceDate(now)
time=interval2-interval1
if(delegate!=nil){
delegate!.getRespone(time,respones.description)
}
}
}
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task.resume()
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}
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}
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class Test{
var tt:NSMutableArray=[]
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init(){
for var i=0;i<10;i+=1 {
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Thread(target: self, selector: #selector(downloadImages), object: nil)
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}
}
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void downloadImages(){
for var i=0; i<100;i+=1{
query q=new query()
q.delegate=self;
}
}
void getRespone(time:float,respones:string){
tt.addObject(time)
}
     void arrange(){
tt.sortUsingComparator(  
    {  
    (s1:AnyObject!,s2:AnyObject!)->NSComparisonResult in  
    var str1=s1 as float
    var str2=s2 as float
    if str1<str2{  
        return NSComparisonResult.OrderedAscending  
    }else{  
        return NSComparisonResult.OrderedDescending  
    } 
})
}
}
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