s1monw commented on a change in pull request #1319: LUCENE-9164: process all
events before closing gracefully
URL: https://github.com/apache/lucene-solr/pull/1319#discussion_r389397123
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File path: lucene/core/src/java/org/apache/lucene/index/IndexWriter.java
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@@ -299,7 +300,77 @@ static int getActualMaxDocs() {
final FieldNumbers globalFieldNumberMap;
final DocumentsWriter docWriter;
- private final Queue<Event> eventQueue = new ConcurrentLinkedQueue<>();
+ private final EventQueue eventQueue = new EventQueue(this);
+
+ static final class EventQueue implements Closeable {
+ private volatile boolean closed = false;
+ private final Semaphore permits = new Semaphore(Integer.MAX_VALUE);
+ private final Queue<Event> queue = new ConcurrentLinkedQueue<>();
+ private final IndexWriter writer;
+
+ EventQueue(IndexWriter writer) {
+ this.writer = writer;
+ }
+
+ private void tryAcquire() {
+ if (permits.tryAcquire() == false) {
+ throw new AlreadyClosedException("queue is closed");
+ }
+ if (closed) {
+ throw new AlreadyClosedException("queue is closed");
+ }
+ }
+
+ boolean add(Event event) {
+ tryAcquire();
+ try {
+ return queue.add(event);
+ } finally {
+ permits.release();
+ }
+ }
+
+ void processEvents() throws IOException {
+ tryAcquire();
+ try {
+ processEventsInternal();
+ } finally {
+ permits.release();
+ }
+ }
+
+ private void processEventsInternal() throws IOException {
+ assert Integer.MAX_VALUE - permits.availablePermits() > 0 : "must
acquire a permit before processing events";
Review comment:
but this wouldn't catch the case where we didn't acquire any permit?
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