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Improve performance by throttling database change events (#5843)
* Improve performance by throttling database change events * Move throttle to logic
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51 changes: 51 additions & 0 deletions
51
src/main/java/org/jabref/logic/util/DelayTaskThrottler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| package org.jabref.logic.util; | ||
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| import java.util.concurrent.Future; | ||
| import java.util.concurrent.RejectedExecutionException; | ||
| import java.util.concurrent.ScheduledThreadPoolExecutor; | ||
| import java.util.concurrent.TimeUnit; | ||
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| /** | ||
| * This class allows to throttle a list of tasks. | ||
| * Use case: you have an event that occurs often, and every time you want to invoke the same task. | ||
| * However, if a lot of events happen in a relatively short time span, then only one task should be invoked. | ||
| * | ||
| * @implNote Once {@link #schedule(Runnable)} is called, the task is delayed for a given time span. | ||
| * If during this time, {@link #schedule(Runnable)} is called again, then the original task is canceled and the new one scheduled. | ||
| */ | ||
| public class DelayTaskThrottler { | ||
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| private static final Logger LOGGER = LoggerFactory.getLogger(DelayTaskThrottler.class); | ||
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| private final ScheduledThreadPoolExecutor executor; | ||
| private final int delay; | ||
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| private Future<?> scheduledTask; | ||
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| /** | ||
| * @param delay delay in milliseconds | ||
| */ | ||
| public DelayTaskThrottler(int delay) { | ||
| this.delay = delay; | ||
| this.executor = new ScheduledThreadPoolExecutor(1); | ||
| this.executor.setRemoveOnCancelPolicy(true); | ||
| } | ||
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| public void schedule(Runnable command) { | ||
| if (scheduledTask != null) { | ||
| scheduledTask.cancel(false); | ||
| } | ||
| try { | ||
| scheduledTask = executor.schedule(command, delay, TimeUnit.MILLISECONDS); | ||
| } catch (RejectedExecutionException e) { | ||
| LOGGER.debug("Rejecting while another process is already running."); | ||
| } | ||
| } | ||
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| public void shutdown() { | ||
| executor.shutdown(); | ||
| } | ||
| } |