always waiting for listener to be done before closing

Author: l-trotta

java-client/src/main/java/co/elastic/clients/elasticsearch/_helpers/bulk/BulkIngester.java

@@ -76,6 +76,7 @@ public class BulkIngester<Context> implements AutoCloseable {
     private final FnCondition addCondition = new FnCondition(lock, this::canAddOperation);
     private final FnCondition sendRequestCondition = new FnCondition(lock, this::canSendRequest);
     private final FnCondition closeCondition = new FnCondition(lock, this::closedAndFlushed);
+    private AtomicInteger listenerInProgressCount = new AtomicInteger();
 
     private static class RequestExecution<Context> {
         public final long id;
@@ -235,7 +236,7 @@ private boolean canAddOperation() {
     }
 
     private boolean closedAndFlushed() {
-        return isClosed && operations.isEmpty() && requestsInFlightCount == 0;
+        return isClosed && operations.isEmpty() && requestsInFlightCount == 0 && listenerInProgressCount.get() == 0;
     }
 
     //----- Ingester logic
@@ -314,14 +315,32 @@ public void flush() {
                 if (resp != null) {
                     // Success
                     if (listener != null) {
-                        scheduler.submit(() -> listener.afterBulk(exec.id, exec.request,
-                            exec.contexts, resp));
+                        listenerInProgressCount.incrementAndGet();
+                        scheduler.submit(() -> {
+                            try {
+                                listener.afterBulk(exec.id, exec.request, exec.contexts, resp);
+                            }
+                            finally {
+                                if(listenerInProgressCount.decrementAndGet() == 0){
+                                    closeCondition.signalIfReady();
+                                }
+                            }
+                        });
                     }
                 } else {
                     // Failure
                     if (listener != null) {
-                        scheduler.submit(() -> listener.afterBulk(exec.id, exec.request,
-                            exec.contexts, thr));
+                        listenerInProgressCount.incrementAndGet();
+                        scheduler.submit(() -> {
+                            try {
+                                listener.afterBulk(exec.id, exec.request, exec.contexts, thr);
+                            }
+                            finally {
+                                if(listenerInProgressCount.decrementAndGet() == 0){
+                                    closeCondition.signalIfReady();
+                                }
+                            }
+                        });
                     }
                 }
 

java-client/src/test/java/co/elastic/clients/elasticsearch/_helpers/bulk/BulkIngesterTest.java

@@ -105,6 +105,12 @@ public void basicTestNoFlush() throws Exception {
         multiThreadTest(10, 3, 5, 100, true);
     }
 
+    @Test
+    public void basicTestNoFlushWithInternalScheduler() throws Exception {
+        // Will have nothing to flush on close.
+        multiThreadTest(10, 3, 5, 100, false);
+    }
+
     private void multiThreadTest(int maxOperations, int maxRequests, int numThreads, int numOperations,
                                  boolean externalScheduler) throws Exception {