是CacheFactory在angularjs单身？ [英] Is CacheFactory in angularjs a singleton?

问题描述

我创建用CacheFactory的服务。我期待这是一个单例。我注入到我的控制器，它控制器的范围内正常工作。但是，一旦我去到不同的页面，不同的范围，我似乎并没有在我存储在同一个控制器在不同的范围内缓存的值。如果不是CacheFactory的行为是单身，我有那些相同的缓存的对象我到处注入CacheService？

这是我的服务为例：

  angular.module（'为MyService，[]）。工厂（'CacheService'，函数（$ cacheFactory）{
        返回$ cacheFactory（'cacheService'，{
            容量：3 //可选 - 打开缓存到缓存LRU
        }）
    }）;
 

然后在我的控制器：

 函数myController的（$范围，CacheService）{
   变种结果= CacheService.get（'储值'）;
   如果（！结果）{
       CacheService.put（'储值'，结果）;
      警报（'结果不存储'）;
   }
   其他
      警报（'结果保存'）;
}
 

解决方案

$ cacheFactory 其实不是你想使用的服务 - 这是一个工厂，用来创建的你想要的单服务使用。目测您的code，它看起来像它应该工作。但我继续创建了一个演示，以证明它。这里的服务：

.factory（'CacheService'，函数（$ cacheFactory）{
   VAR缓存= $ cacheFactory（'cacheService'，{
     容量：3 //可选 - 打开缓存到缓存LRU
   }）;   返回高速缓存;
}）;


在这个例子中， CacheService 的是的一个与创建一个本地缓存的单 $ cacheFactory ，这是我们从服务返回。我们可以注入到这一点，我们希望任何控制器，它总是会返回相同的值。

下面是一个工作Plunker：<一href=\"http://plnkr.co/edit/loKWGms1lMCnmiWa1QA7?p=$p$pview\">http://plnkr.co/edit/loKWGms1lMCnmiWa1QA7?p=$p$pview

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如果由于某种原因，您的文章不包含什么打破了你的code，请随时更新我Plunker打破它，我们可以从那里。

I've created a service using the CacheFactory. I was expecting it to be a singleton. I inject it into my controller and it works fine within the scope of the controller. But once I go to a different page with a different scope, I don't seem to have the values in the cache that I stored in the same controller in a different scope. Shouldn't the behavior of the CacheFactory be a singleton where I have those same cached objects everywhere I inject the CacheService?

This is my service as an example:

angular.module('MyService', []).factory('CacheService', function($cacheFactory) {
        return $cacheFactory('cacheService', {
            capacity: 3 // optional - turns the cache into LRU cache
        })
    });

Then in my controller:

function MyController($scope, CacheService) {
   var results= CacheService.get('storedvalue');
   if(!results){
       CacheService.put('storedvalue', results);
      alert('results not stored');
   }
   else
      alert('results stored');
}

解决方案

$cacheFactory is actually not the service you want to use - it's a factory that you use to create the singleton service you want to use. Eyeballing your code, it seems like it should work. But I went ahead and created a demo to prove that it does. Here's the service:

.factory('CacheService', function($cacheFactory) {
   var cache = $cacheFactory('cacheService', {
     capacity: 3 // optional - turns the cache into LRU cache
   });

   return cache;
});

In this example, CacheService is the singleton that has a local cache created with $cacheFactory, which is what we return from the service. We can inject this into any controller we want and it will always return the same values.

Here's a working Plunker: http://plnkr.co/edit/loKWGms1lMCnmiWa1QA7?p=preview

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If for some reason your post doesn't contain what broke your code, please feel free to update my Plunker to break it and we can go from there.

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