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POChanging value of a Java variable from outside the running process
 

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    <p>I have a Java program performing some large analysis tasks, running through a loop (essentially 24/7) in one thread and accessing a number of other threads to do parallel processing. I am presently configuring the number of other active threads to send tasks to using a constant. During the day, I like to set this to a smaller value (say, 4) to leave some of my machine's resources available for my interactive use. Overnight (or other times I leave my machine unattended) I would like the program to use a larger number of threads (say, 8). Currently I am halting the program, changing the constant, rebuilding, and restarting the program (I have to restart all 8 threads). This is becoming tedious to do on a regular basis.</p> <p>I would like to set up a simple system to type a single command/script from outside Java to change the program's behavior, so that it can remain running but vary the number of idle threads based on my input. I have searched SO for answers and know that this is apparently not possible with an Environment variable. I can think of two possibilities: set a value in a text file and read that in each cycle of the loop; and store a value in the MySQL db that my program interacts with. </p> <p>While these solutions would work for me, I am interested in knowing if there are any other (more standard?) ways of having Java "configuration variables" accessible from outside the running process.</p> <p>If it's relevant, I'm running the processes from within Eclipse.</p> <p>Edit: Just thought of another possibility: USR1 and USR2 signals...</p>
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