IT界討論區(40) 放咗工吹咩IT呀, 我想打機呀

唔好比T巴誤導
佢由頭到尾想證實static同singleton有關係
static 公廁,server層面全世界都用得 會出錯value

我都覺得係

通常Singleton都係一個Single Thread Program又要access一啲共通data先會整
例如Unity3D入面咁

我Application有時都係咁整

就算Multithread入面行Singleton都可以做返個Thread Safe行法

T巴個例子都係低質
個i走左入去個static method
之後變左第2個數

正常唔應該咁做

我覺得呢個未必關return new事
不如話每次pass入去都開個新ref會唔會好啲?

但int反而要知

岩岩先返到屋企
聽日再睇

Static 同singletion 兩樣野黎。Load time已經可以有分別。

sor我1999

我個問題就係不論係singleton咁factory定公廁static
好似我頭先咁嘅concurrent call function 會唔會出事

可能係偏向thread safe問題
因為我對.net個thread pool了解唔深
唔知咁會唔會有事定點先會有事

public static bool operation (List<String> c) {
 return c == null;
}

第二個class
bool result = StaticClass.operation(myList.ToList());

應該咁行會冇事?
雖然一個method入面係完全唔應該要求出面做啲咩先係好method

已經完全唔關Singleton事

多過一個人會
除非第一個Logout走左/DOM左個object
否則第二個人用第一個條有血M巾著上身

用thread safe仲死多兩錢重

新貼留名,上個POST真係好撚精彩

以spring為例：Singletion object 如果好似一個helper object咁for handle 唔同user http request, 而個singletion object 有member variable, 咁就出事啦。姐係，singletion 主要for stateless 用途

我個人低質

actual case

有個app有個static helper class static method係

static string formatstr(string input){
return input.Split(‘x’)[0];
}

呢個算係return reference? 咁concurrent call是咪會炒

講番singleton
一個app有多個thread/class要share用同一個ref時
而個ref入面既data基本上冇咩事係唔會改
例如一隻lihkg app入面自己既user info, token之類咁
咁先啱用singleton
而如果要記低其他人既user info
就應該各自有個user object記低

要睇C#唔用Return可唔可以改到Variable


int i = 0;

plusOne(i);

i = ?

大家出手救吓我同我清下concept啦
我係屎我係垃圾

當然唔係，singletion 係shared by everyone, 要記各自ga資料，當然用prototype, 即係new obj

Yes ar

其實 Singleton 同 Static 係好似，但前者可以 extends。

佢講緊Client not server

得呀RUN到呀

但用static錯左 ,你將條List改變左null

[url]https://openhome.cc/Gossip/DesignPattern/SingletonPattern.htm
[/url]
幾有用

sorry, 做開backend.

屌唔撚知點解多左<br>
https://openhome.cc/Gossip/DesignPattern/SingletonPattern.htm

但唔知係我真心定咩
依然唔覺得i-vtec講autofac係singleton冇問題

查返autofac都係拎嚟做Scope
https://autofaccn.readthedocs.io/en/latest/lifetime/

The scope of a service is the area in the application where that service can be shared with other components that consume it. For example, in your application you may have a global static singleton - the “scope” of that global object instance would be the whole application. On the other hand, you might create a local variable in a for loop that makes use of the global singleton - the local variable has a much smaller scope than the global.

正正係佢講嗰種用法
令到Report分開唔會撞


但我認知中singleton真係會access同一個instance
even web application

即係例如如果我想拎一個Program第一次有人access至到而家嘅時間差
咁User A access個application create Singleton instance嘅時候就會記錄咗佢access嘅時間
時間差係0
之後User B入去, 拎返同一個Singleton instance, 咁佢就可以計返個同第一個User, 即係A嘅時間差

用法好唔一樣

岩呀

你地個autofac
同java果個spring autowired唔同