-
Notifications
You must be signed in to change notification settings - Fork 36
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #1062 from Ladicek/virtual-threads-queueing
add FaultTolerance.BulkheadBuilder.enableVirtualThreadsQueueing()
- Loading branch information
Showing
4 changed files
with
135 additions
and
96 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
107 changes: 107 additions & 0 deletions
107
...e/src/main/java/io/smallrye/faulttolerance/core/bulkhead/SemaphoreThreadPoolBulkhead.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package io.smallrye.faulttolerance.core.bulkhead; | ||
|
|
||
| import static io.smallrye.faulttolerance.core.bulkhead.BulkheadLogger.LOG; | ||
|
|
||
| import java.util.concurrent.CancellationException; | ||
| import java.util.concurrent.Semaphore; | ||
| import java.util.concurrent.atomic.AtomicBoolean; | ||
| import java.util.concurrent.atomic.AtomicReference; | ||
|
|
||
| import io.smallrye.faulttolerance.core.FaultToleranceStrategy; | ||
| import io.smallrye.faulttolerance.core.InvocationContext; | ||
| import io.smallrye.faulttolerance.core.async.FutureCancellationEvent; | ||
|
|
||
| /** | ||
| * Assumes that this bulkhead is already executed on an extra thread. | ||
| * Under that assumption, we don't have to submit tasks to another executor | ||
| * or use an actual queue. We just limit the task execution by semaphores. | ||
| */ | ||
| public class SemaphoreThreadPoolBulkhead<V> extends BulkheadBase<V> { | ||
| private final int queueSize; | ||
| private final Semaphore capacitySemaphore; | ||
| private final Semaphore workSemaphore; | ||
|
|
||
| public SemaphoreThreadPoolBulkhead(FaultToleranceStrategy<V> delegate, String description, int size, int queueSize) { | ||
| super(description, delegate); | ||
| this.queueSize = queueSize; | ||
| this.capacitySemaphore = new Semaphore(size + queueSize, true); | ||
| this.workSemaphore = new Semaphore(size, true); | ||
| } | ||
|
|
||
| @Override | ||
| public V apply(InvocationContext<V> ctx) throws Exception { | ||
| LOG.trace("ThreadPoolBulkhead started"); | ||
| try { | ||
| return doApply(ctx); | ||
| } finally { | ||
| LOG.trace("ThreadPoolBulkhead finished"); | ||
| } | ||
| } | ||
|
|
||
| private V doApply(InvocationContext<V> ctx) throws Exception { | ||
| if (capacitySemaphore.tryAcquire()) { | ||
| LOG.trace("Capacity semaphore acquired, accepting task into bulkhead"); | ||
| ctx.fireEvent(BulkheadEvents.DecisionMade.ACCEPTED); | ||
| ctx.fireEvent(BulkheadEvents.StartedWaiting.INSTANCE); | ||
|
|
||
| AtomicBoolean cancellationInvalid = new AtomicBoolean(false); | ||
| AtomicBoolean cancelled = new AtomicBoolean(false); | ||
| AtomicReference<Thread> executingThread = new AtomicReference<>(Thread.currentThread()); | ||
| ctx.registerEventHandler(FutureCancellationEvent.class, event -> { | ||
| if (cancellationInvalid.get()) { | ||
| // in case of retries, multiple handlers of FutureCancellationEvent may be registered, | ||
| // need to make sure that a handler belonging to an older bulkhead task doesn't do anything | ||
| return; | ||
| } | ||
|
|
||
| if (LOG.isTraceEnabled()) { | ||
| LOG.tracef("Cancelling bulkhead task,%s interrupting executing thread", | ||
| (event.interruptible ? "" : " NOT")); | ||
| } | ||
| cancelled.set(true); | ||
| if (event.interruptible) { | ||
| executingThread.get().interrupt(); | ||
| } | ||
| }); | ||
|
|
||
| try { | ||
| workSemaphore.acquire(); | ||
| LOG.trace("Work semaphore acquired, running task"); | ||
| } catch (InterruptedException e) { | ||
| cancellationInvalid.set(true); | ||
|
|
||
| capacitySemaphore.release(); | ||
| LOG.trace("Capacity semaphore released, task leaving bulkhead"); | ||
| ctx.fireEvent(BulkheadEvents.FinishedWaiting.INSTANCE); | ||
| throw new CancellationException(); | ||
| } | ||
|
|
||
| ctx.fireEvent(BulkheadEvents.FinishedWaiting.INSTANCE); | ||
| ctx.fireEvent(BulkheadEvents.StartedRunning.INSTANCE); | ||
| try { | ||
| if (cancelled.get()) { | ||
| throw new CancellationException(); | ||
| } | ||
| return delegate.apply(ctx); | ||
| } finally { | ||
| cancellationInvalid.set(true); | ||
|
|
||
| workSemaphore.release(); | ||
| LOG.trace("Work semaphore released, task finished"); | ||
| capacitySemaphore.release(); | ||
| LOG.trace("Capacity semaphore released, task leaving bulkhead"); | ||
| ctx.fireEvent(BulkheadEvents.FinishedRunning.INSTANCE); | ||
| } | ||
| } else { | ||
| LOG.debugOrTrace(description + " invocation prevented by bulkhead", | ||
| "Capacity semaphore not acquired, rejecting task from bulkhead"); | ||
| ctx.fireEvent(BulkheadEvents.DecisionMade.REJECTED); | ||
| throw bulkheadRejected(); | ||
| } | ||
| } | ||
|
|
||
| // only for tests | ||
| int getQueueSize() { | ||
| return Math.max(0, queueSize - capacitySemaphore.availablePermits()); | ||
| } | ||
| } |