The GarbageCollector aspect.

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- Create the @GarbageCollector annotation; the annotation should be on the
methods.
- The annotation contains a parameter (minFreeMemory). 

The idea is to annotate methods with @GarbageCollector annotation; when the
annotated method is executed and the amount of free memory is less than the
value of minFreeMemory parameter then a call to the System.gc() is made.

Original issue reported on code.google.com by adyc...@gmail.com on 1 Jan 2009 at 4:05

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I don't know if this is a god idea because System.gc will remove all the unused
objects so this operation is quite expensive.

Original comment by adyc...@gmail.com on 1 Jan 2009 at 4:35

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Here is a possible version for this aspect.

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;


/**
 * Aspect that is used to automatically execute a {@link System#gc()} when the
 * level of free heap memory is less than {@value #HEAP_MINIMUM_ALLOWED_LEVEL}.
 * 
 *
 */
@Aspect
public class GarbageCollectorAspect {

    /**
     * The minimum level of free heap memory allowed.
     */
    private static final long HEAP_MINIMUM_ALLOWED_LEVEL = 300000;

//  @Pointcut("cflow(execution(@GarbageCollectorTrigger * *(..))) "
//        + "&& !within(GarbageCollectorAspect+)"
//        + "&& within(com.xxx.xxx.xxx."
//        + "handler.XIR2ArchiveFileHandler+)")
//  @Pointcut("cflow(execution(@GarbageCollectorTrigger * *(..))) "
//  + "&& !within(GarbageCollectorAspect+)")

    @Pointcut("execution(public void com.xx.xxx.xxx."
        + "archiveload.handler.*.startElement(..))")
    void executionOfStartElementMethodsJointPoint() {
    }

    /**
     * Before every execution of the method intercepted by the pointcut 
     * described by 
     * {@link #executionOfStartElementMethodsJointPoint()} the advice verifies 
     * the level of free heap memory and if the level is less than 
     * {@value #HEAP_MINIMUM_ALLOWED_LEVEL} then a {@link System#gc()} is executed.
     * 
     * @param thisJoinPoint aspectJ generated object.
     */
    @Before("executionOfStartElementMethodsJointPoint()")
    public void executionOfStartElementMethodsAdvice(JoinPoint thisJoinPoint) {
        long freeHeapMemory = Runtime.getRuntime().freeMemory();

        if (freeHeapMemory < HEAP_MINIMUM_ALLOWED_LEVEL) {
            System.out.println("---------System.gc executed !--------");
            System.gc();
        }
    }
}    

Original comment by adyc...@gmail.com on 5 Jan 2009 at 11:02

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Original comment by adyc...@gmail.com on 11 May 2009 at 5:13

• Added labels: Milestone-Release0.5

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Original comment by adyc...@gmail.com on 11 May 2009 at 5:15

• Added labels: Milestone-Release0.4
• Removed labels: Milestone-Release0.5

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Original comment by adyc...@gmail.com on 15 Nov 2009 at 6:32

• Removed labels: Milestone-Release0.4

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Original comment by adyc...@gmail.com on 22 Jan 2011 at 5:20

• Changed state: New