Automatic Git Cache Maintenance- Scheduling Maintenance Tasks

Thu, 16 Jun 2022 15:06:15 -0700 

Hello World,
I am currently working on the Automatic Git Cache Maintenance Project under GSoC 2022. The aim of the project is to integrate git maintenance command to Jenkins to optimize the caches present on the Jenkins Controller. 


Administrators can schedule various maintenance tasks by entering 
CronSytax in the UI. The data entered is stored internally in an XML 
file. I am confused between PeriodicWork/AsyncPeriodicWork to schedule 
the maintenance tasks.



The way I am thinking to implement is to extend this class and check 
every minute whether any of the maintenance task satisfy the cronSyntax 
entered by the administrator. If the current time satisfies the 
cronSyntax of a particulat task, then that task is added to a queue.



I am planning to create another thread which consumes the maintenance 
tasks present in the queue. The reason for creating another thread is to 
not block the thread which validates and pushes the maintenance task 
into the queue. The javadoc of PeriodicWork suggests to use it if the 
work done is short. I am more inclined towards using PeriodicWork. 
However, I am not sure about the performance.



I am not sure if this is the best approach and looking for help from the 
community. Open to suggestions and discussion.


Thank You

Hrushikesh Rao


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Title: PeriodicWork (Jenkins core 2.354 API)



















Package hudson.model


Class PeriodicWork



















    

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      Constructor Detail
      




        

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        PeriodicWork
        

        public PeriodicWork()
        

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      Method Detail
      




        

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        getRecurrencePeriod
        

        public abstract long getRecurrencePeriod()
        

        Gets the number of milliseconds between successive executions.

 
        
 Hudson calls this method once to set up a recurring timer, instead of
 calling this each time after the previous execution completed. So this class cannot be
 used to implement a non-regular recurring timer.

 
        
 IOW, the method should always return the same value.
        

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        getInitialDelay
        

        public long getInitialDelay()
        

        Gets the number of milliseconds til the first execution.

 
        
 By default it chooses the value randomly between 0 and getRecurrencePeriod()
        

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Title: AsyncPeriodicWork (Jenkins core 2.354 API)



















Package hudson.model


Class AsyncPeriodicWork



















    

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      Field Detail
      




        

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        name
        

        public final String name
        

        Human readable name of the work.
        

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      Constructor Detail
      




        

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        AsyncPeriodicWork
        

        protected AsyncPeriodicWork​(String name)
        

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      Method Detail
      




        

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        doRun
        

        public final void doRun()
        

        Schedules this periodic work now in a new thread, if one isn't already running.
        

        

        Specified by:
        

        doRun in class SafeTimerTask
        

        

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        getLogFile
        

        protected File getLogFile()
        

        Determines the log file that records the result of this task.
        

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        getNormalLoggingLevel
        

        protected Level getNormalLoggingLevel()
        

        Returns the logging level at which normal messages are displayed.
        

        

        Returns:
        

        The logging level as @Level.
        

        Since:
        

        1.551
        

        

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        getSlowLoggingLevel
        

        protected Level getSlowLoggingLevel()
        

        Returns the logging level at which previous task still executing messages is displayed.
        

        

        Returns:
        

        The logging level as @Level.
        

        Since:
        

        1.565
        

        

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        getErrorLoggingLevel
        

        protected Level getErrorLoggingLevel()
        

        Returns the logging level at which error messages are displayed.
        

        

        Returns:
        

        The logging level as @Level.
        

        Since:
        

        1.551
        

        

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