Question

使用Grails 2.4.5我有以下服务：

class CartService {

    static scope = 'session'
    static proxy = true

    def items = []

    def getItemCount() {
        items.size()
    }

}

我想在控制器中使用此服务：

class CartController {

    def cartService // unique per session

    def addItem = {
        cartService.items << new CartItem(product: Product.get(params.id))
    }

}

我尝试了Grails scoped-proxy plugin的0.3版本。但是我收到以下错误：

Error creating bean with name 'cartService': Scope 'session' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton; nested exception is java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
    Line | Method
->>  262 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    745 | run       in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'cartService': Scope 'session' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton; nested exception is java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
->>  262 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    745 | run       in java.lang.Thread
Caused by IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
->>  262 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    745 | run       in java.lang.Thread

如何在Grails控制器中包含会话范围服务？

Answer 1

看起来您可能在Grails 2.4.x插件中发现了一两个问题（并且也报告过）。如果是这种情况，您可以参考插件作者的博文：Scoped Services & Proxies in Grails。

他在没有插件的情况下展示了如何做到这一点。我试了一下，它的工作原理是2.4.5。

resources.groovy：

import org.springframework.aop.scope.ScopedProxyFactoryBean

beans = {
    cartServiceProxy(ScopedProxyFactoryBean) {
        targetBeanName = 'cartService'
        proxyTargetClass = true
    }
}

代理是手动完成的，因此您可以删除static proxy

class CartService {
    static scope = 'session'
    def items = []

    def getItemCount() {
        items.size()
    }
}

Controller然后引用代理

class CartController {
    def cartServiceProxy 
    ... 
}

请注意，有一点混淆（至少对我来说）是Controller Documentation for 2.4.x表示默认范围是prototype，但在描述Scoped Services的部分中，它表示从2.3开始。 x默认控制器范围为singleton。

希望这有帮助。

更新：为了澄清一点，在Grails 2.3之后，默认控制器范围仍为prototype，但是当grails生成新应用程序时，会生成将默认控制器范围设置为singleton的配置（如果可能的话，就像Burt在下面所说的那样，你真的应该拍摄。）

在Config.groovy中生成配置

// The default scope for controllers. May be prototype, session or singleton.
// If unspecified, controllers are prototype scoped.
grails.controllers.defaultScope = 'singleton'

在Grails控制器中包含具有会话范围的服务？

1 个答案: