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This PR fixes a special case where the underlying resource was not closed when using zero read timeout and reading the feed using an iterator or a spliterator.
Resource Management The CleaningAction class attempts to close resources, but it logs a warning without rethrowing the exception or handling it further. Consider rethrowing exceptions or implementing a more robust error handling strategy to ensure that resource leaks are properly addressed.
Concurrency Concern The RssItemIterator class uses AtomicBoolean for isClosed state management, but there's a potential race condition between checking and setting this state in the close method. Consider using a lock or synchronizing the method to ensure thread safety.
Add null checks before attempting to close resources to prevent NullPointerException
Consider handling the potential NullPointerException that could occur if xmlStreamReader or any of the resources in the CleaningAction are null when attempting to close them.
-try {- xmlStreamReader.close();-} catch (XMLStreamException e) {- LOGGER.log(Level.WARNING, "Failed to close XML stream. ", e);+if (xmlStreamReader != null) {+ try {+ xmlStreamReader.close();+ } catch (XMLStreamException e) {+ LOGGER.log(Level.WARNING, "Failed to close XML stream. ", e);+ }
}
for (AutoCloseable resource : resources) {
- try {- resource.close();- } catch (Exception e) {- LOGGER.log(Level.WARNING, "Failed to close resource. ", e);+ if (resource != null) {+ try {+ resource.close();+ } catch (Exception e) {+ LOGGER.log(Level.WARNING, "Failed to close resource. ", e);+ }
}
}
Suggestion importance[1-10]: 8
Why: This suggestion addresses a potential bug by adding null checks before closing resources, which prevents NullPointerExceptions and ensures more robust error handling.
8
Best practice
Ensure proper cancellation of scheduled tasks before nullifying to prevent leaks
Ensure that the ScheduledFuture<?> parseWatchdog is cancelled before setting it to null to avoid potential memory leaks or unexpected behavior.
Why: The suggestion improves code reliability by ensuring that scheduled tasks are properly cancelled before being set to null, which can help prevent memory leaks or unexpected behavior.
7
Use PhantomReference and ReferenceQueue for more reliable resource cleanup checking in tests
Replace the use of System.gc() and Thread.sleep() in tests with a more reliable method for ensuring that resources are cleaned up, such as using PhantomReference and ReferenceQueue.
-for (int retries = 10; retries > 0; retries--) {+// Example using PhantomReference and ReferenceQueue+ReferenceQueue<Item> queue = new ReferenceQueue<>();+PhantomReference<Item> ref = new PhantomReference<>(item, queue);+item = null;+while (queue.poll() == null) {
System.gc();
- try {- Thread.sleep(10L);- } catch (InterruptedException ignore) { }+ Thread.sleep(10L);
}
Suggestion importance[1-10]: 5
Why: This suggestion promotes a best practice by recommending a more reliable method for resource cleanup in tests, though the current approach may still be functional for its intended purpose.
5
Enhancement
Use more specific exceptions for clarity and better error handling
Consider using a more specific exception type or a custom exception instead of the generic Exception in the resource-closing loop to provide more clarity on what exceptions are expected.
Why: Using more specific exceptions enhances code clarity and improves error handling by making it clear what types of exceptions are expected during resource closing.
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added
enhancement
User description
This PR fixes a special case where the underlying resource was not closed when using zero read timeout and reading the feed using an iterator or a spliterator.
Example:
PR Type
Bug fix, Enhancement, Tests
Description
CleanerinAbstractRssReaderto ensure underlying resources are properly closed when no timeout is used.CleaningActionclass to handle the closing ofXMLStreamReaderand other resources.RssItemIteratorto implementAutoCloseableand utilizeCleanerfor resource management.Cleaner.Changes walkthrough 📝
AbstractRssReader.java
Implement resource cleanup using Cleaner in AbstractRssReadersrc/main/java/com/apptasticsoftware/rssreader/AbstractRssReader.java
Cleanerto manage resource cleanup.CleaningActionclass to handle resource closing.RssItemIteratorto implementAutoCloseable.RssReaderIntegrationTest.java
Add tests for resource cleanup and modify existing testssrc/test/java/com/apptasticsoftware/integrationtest/RssReaderIntegrationTest.java
Cleaner.HttpClient.