Grails - 在后台运行TCP线程 [英] Grails - running a TCP thread on background

问题描述

我想有一个应用程序监听TCP套接字连接并对它们做出反应。为了我需要启动一个后台线程 - 我可以在BootStrap.groovy中做到这一点。

对于后台线程，我下载了执行程序插件。

代码如下所示：

  class BootStrap {
 
 def myService 
 
 def init = {servletContext  - > 
 log.info（Bootstrapping）
 development {
 log.info（Doing myService async）
 myService.doSomething（）
} 
 } 
 
 class MyService {
 def doSomething（）{
 runAsync {
 printlnRunning！ 
} 
} 
} 
} 
  

代码是来自SO的另一个线程的复制粘贴。

我得到这个错误：

  |错误2014-06-06 22：30：37,317 [localhost-startStop-1] ERROR context.GrailsContextLoader  - 初始化应用程序时出错：无法在null对象上调用方法doSomething（）
消息：无法调用方法doSomething（）on空对象
 Line |方法
  - >> 14 | doCall in BootStrap $ _closure1_closure2 
  -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -  
  

看起来myService对象没有被填充。编辑：尝试使用executorService，但这并没有帮助，或者我需要编辑一些配置或者什么？

---

。

  |错误2014-06-07 00：06：36,099 [localhost-startStop-1]错误context.GrailsContextLoader  - 初始化应用程序时出错：无法在null对象上调用方法doSomething（）
消息：无法调用方法doSomething（）on空对象
 Line |方法
  - >> 14 |在BootStrap中执行doCall $ _closure1_closure2 
  

解决方案

Bootstrap.groovy

  class BootStrap {
 
 def myService 
 
 def init = {servletContext  - > 
 log.info（Bootstrapping）
 development {
 log.info（Doing myService async）
 myService.doSomething（）
} 
 } 
 
} 
  

MyService.groovy

  class MyService {
 def doSomething（）{
 runAsync {
 printlnRunning！ 
} 
} 
} 
  

I want to have an app that listens to TCP socket connections and can react to them. In order for that I need to start a background thread on start - I can do that in BootStrap.groovy.

For the background threading I downloaded the executor plugin.

The code looks like this:

class BootStrap {

def myService

def init = { servletContext ->
    log.info("Bootstrapping")
    development {
        log.info("Doing myService async ")
        myService.doSomething()
    }
}

class MyService {
    def doSomething() {
        runAsync {
            println "Running!"
        }
    }
}
}

This code is a copy-paste from an another thread here at SO.

I am getting this error:

| Error 2014-06-06 22:30:37,317 [localhost-startStop-1] ERROR context.GrailsContextLoader  - Error initializing the application: Cannot invoke method doSomething() on null object
Message: Cannot invoke method doSomething() on null object
    Line | Method
->>   14 | doCall                       in BootStrap$_closure1_closure2
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

It seems that the myService object is not populated. Do I need to edit some configs or something?

---

Edit: tried to use executorService, but that didn't help either.

| Error 2014-06-07 00:06:36,099 [localhost-startStop-1] ERROR context.GrailsContextLoader  - Error initializing the application: Cannot invoke method doSomething() on null object
Message: Cannot invoke method doSomething() on null object
    Line | Method
->>   14 | doCall                       in BootStrap$_closure1_closure2

解决方案

You should move the service class to the proper folder in Grails project.

Bootstrap.groovy

class BootStrap {

   def myService

   def init = { servletContext ->
      log.info("Bootstrapping")
      development {
         log.info("Doing myService async ")
         myService.doSomething()
      }
   }

}

MyService.groovy

class MyService {
    def doSomething() {
        runAsync {
            println "Running!"
        }
    }
}

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