Fix race condition in task scheduling #10892
Merged
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Under some circumstances, ExecutableMethodProcessor.process may be called during or even after the StartupEvent is fired. In that case, scheduled methods may be ignored or there may be a ConcurrentModificationException.
This patch moves the schedule logic into its own method, called by a class ScheduleTaskRunnable that guards the schedule logic using an AtomicBoolean so that it is run only once. Inside process(), the task is created, registered in a ConcurrentHashMap and, if the StartupEvent has already been fired, invoked. Inside the StartupEvent listener, all previously registered tasks are invoked.
This ensures that the ScheduleTaskRunnable is invoked at least once.