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Spring AOP for objects instantiated outside of the application context

Posted on 2008-09-30
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Last Modified: 2013-11-11
Hi,

I have a simple app. I've got a TaskExecutorService class which instantiated several Runnable's and gives them to the TaskExecutor.

I've managed to wire things with Spring. however what I need is to weave a logger advise before and after the run() method of my Runnable class.

The problem is the task class which implements Runnable is NOT instantiated by Spring, instead it is instantiated by the TaskExecutorService outside the Spring container.

Can somebody tell me how can I weave an advise for objects instantiated OUTSIDE the Spring context? I could not how to make use of ProxyFactory.

Thanks in advance


package springexec;
 
public class HelloWorldCountDownTask implements Runnable {
 
    private String name;
    private int count = 4;
 
    public HelloWorldCountDownTask(String name) {
        this.name = name;
    }        
    
    public void run() {
        while( count > 0 ){
            count--;
            if (count == 0){
                System.out.println(name + " says 'Hello World!'");
            } else {
                System.out.println(name + " : " + count);
                Thread.yield();
            }
        }
    }
}
 
package springexec;
 
import org.springframework.core.task.TaskExecutor;
 
public class TaskExecutorExample {
 
    private TaskExecutor taskExecutor;
 
    public TaskExecutorExample(TaskExecutor taskExecutor) {
        this.taskExecutor = taskExecutor;
    }
    
    public void executeTasks(){
        this.taskExecutor.execute(new HelloWorldCountDownTask("Anna"));
        this.taskExecutor.execute(new HelloWorldCountDownTask("Beth"));
        this.taskExecutor.execute(new HelloWorldCountDownTask("Charlie"));
        this.taskExecutor.execute(new HelloWorldCountDownTask("Daniel"));
 
    }
}
 
package springexec;
 
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.task.TaskExecutor;
 
public class SyncTaskExecutorExample {
 
    public static void main(String args[]){
        ApplicationContext ctx = new ClassPathXmlApplicationContext("springexec/exec.xml");
        
        TaskExecutor taskExecutor = (TaskExecutor) ctx.getBean("syncTaskExecutor",TaskExecutor.class);
        TaskExecutorExample example = new TaskExecutorExample(taskExecutor);
        example.executeTasks();
    }
}
 
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
       http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd
       http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd">
    
    <bean id="threadPoolExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
          <property name="corePoolSize" value="5"/>
          <property name="maxPoolSize" value="10"/>
          <property name="queueCapacity" value="25"/>
    </bean>
          
    <bean id="syncTaskExecutor" class="org.springframework.core.task.SyncTaskExecutor"/>
    
    <bean id="timerTaskExecutor" class="org.springframework.scheduling.timer.TimerTaskExecutor">
        <property name="delay" value="3000"/>
        <property name="timer" ref="timer"/>
    </bean>
    
    <bean id="timer" class="java.util.Timer"/>
    
    <bean id="logger" class="springexec.Logger"/>
 
</beans>

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Question by:apollonius_tyana
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7 Comments
 
LVL 12

Expert Comment

by:marklorenz
ID: 22766797
If you mean Spring AOP, you cannot use it to work outside the Spring framework/container.  In this case, you could consider using AspectJ.
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Author Comment

by:apollonius_tyana
ID: 22774378
By outside I mean objects that have to be instantiated within new() rather than getBean(). If you look at the example you'll see there's a Runnable class which is instantiated by the Executor. What I need is a logging aspect around the Runnable object. How would I do it in Spring configuration?
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Author Comment

by:apollonius_tyana
ID: 23049174
Do not close the question. No people in EE site able to anwer the question does not mean the question is abondened.
0
 
LVL 59

Expert Comment

by:Kevin Cross
ID: 23096641
Do you have to use spring logger?

I would do something like this if I am understanding your requirements correctly:

public void run() {
        // log start of run here
        // http://java.sun.com/j2se/1.4.2/docs/api/java/util/logging/Logger.html

        while( count > 0 ){
            count--;
            if (count == 0){
                System.out.println(name + " says 'Hello World!'");
            } else {
                System.out.println(name + " : " + count);
                Thread.yield();
            }
        }

        // log end of run here    
    }
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Accepted Solution

by:
apollonius_tyana earned 0 total points
ID: 23243474
Actually the issue is not the logging itself. I was wondering if I could inject AOP from Spring configuration. But it seems like it's not possible unless I somehow extend or modify Spring TaskExecutor, which means I have to deal with container issues which I wanted to avoid.  
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