Make StreamListener read batch messages at once

Author: Danden1

src/main/java/org/springframework/data/redis/stream/StreamListener.java

@@ -17,6 +17,8 @@
 
 import org.springframework.data.redis.connection.stream.Record;
 
+import java.util.List;
+
 /**
  * Listener interface to receive delivery of {@link Record messages}.
  *
@@ -33,5 +35,5 @@ public interface StreamListener<K, V extends Record<K, ?>> {
 	 *
 	 * @param message never {@literal null}.
 	 */
-	void onMessage(V message);
+	void onMessage(List<V> message);
 }

src/main/java/org/springframework/data/redis/stream/StreamMessageListenerContainer.java

@@ -16,6 +16,7 @@
 package org.springframework.data.redis.stream;
 
 import java.time.Duration;
+import java.util.List;
 import java.util.OptionalInt;
 import java.util.concurrent.Executor;
 import java.util.function.Predicate;
@@ -82,10 +83,10 @@
  * <p>
  * {@link StreamMessageListenerContainer} requires a {@link Executor} to fork long-running polling tasks on a different
  * {@link Thread}. This thread is used as event loop to poll for stream messages and invoke the
- * {@link StreamListener#onMessage(Record) listener callback}.
+ * {@link StreamListener#onMessage(List)}  listener callback}.
  * <p>
  * {@link StreamMessageListenerContainer} tasks propagate errors during stream reads and
- * {@link StreamListener#onMessage(Record) listener notification} to a configurable {@link ErrorHandler}. Errors stop a
+ * {@link StreamListener#onMessage(List)}  listener notification} to a configurable {@link ErrorHandler}. Errors stop a
  * {@link Subscription} by default. Configuring a {@link Predicate} for a {@link StreamReadRequest} allows conditional
  * subscription cancelling or continuing on all errors.
  * <p>

src/main/java/org/springframework/data/redis/stream/StreamPollTask.java

@@ -16,6 +16,7 @@
 package org.springframework.data.redis.stream;
 
 import java.time.Duration;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 import java.util.concurrent.CountDownLatch;
@@ -147,14 +148,14 @@ private List<ByteRecord> readRecords() {
 	}
 
 	private void deserializeAndEmitRecords(List<ByteRecord> records) {
+		List<V> messages = new ArrayList<>();
 
 		for (ByteRecord raw : records) {
 
 			try {
-
 				pollState.updateReadOffset(raw.getId().getValue());
 				V record = convertRecord(raw);
-				listener.onMessage(record);
+				messages.add(record);
 			} catch (RuntimeException ex) {
 
 				if (cancelSubscriptionOnError.test(ex)) {
@@ -166,8 +167,11 @@ private void deserializeAndEmitRecords(List<ByteRecord> records) {
 				}
 
 				errorHandler.handleError(ex);
+				return;
 			}
 		}
+
+		listener.onMessage(messages);
 	}
 
 	private V convertRecord(ByteRecord record) {

src/test/java/org/springframework/data/redis/stream/AbstractStreamMessageListenerContainerIntegrationTests.java

@@ -91,7 +91,7 @@ void shouldReceiveMapMessages() throws InterruptedException {
 		BlockingQueue<MapRecord<String, String, String>> queue = new LinkedBlockingQueue<>();
 
 		container.start();
-		Subscription subscription = container.receive(StreamOffset.create("my-stream", ReadOffset.from("0-0")), queue::add);
+		Subscription subscription = container.receive(StreamOffset.create("my-stream", ReadOffset.from("0-0")), queue::addAll);
 
 		subscription.await(DEFAULT_TIMEOUT);
 
@@ -119,7 +119,7 @@ void shouldReceiveSimpleObjectHashRecords() throws InterruptedException {
 		BlockingQueue<ObjectRecord<String, String>> queue = new LinkedBlockingQueue<>();
 
 		container.start();
-		Subscription subscription = container.receive(StreamOffset.create("my-stream", ReadOffset.from("0-0")), queue::add);
+		Subscription subscription = container.receive(StreamOffset.create("my-stream", ReadOffset.from("0-0")), queue::addAll);
 
 		subscription.await(DEFAULT_TIMEOUT);
 
@@ -143,7 +143,7 @@ void shouldReceiveObjectHashRecords() throws InterruptedException {
 		BlockingQueue<ObjectRecord<String, LoginEvent>> queue = new LinkedBlockingQueue<>();
 
 		container.start();
-		Subscription subscription = container.receive(StreamOffset.create("my-stream", ReadOffset.from("0-0")), queue::add);
+		Subscription subscription = container.receive(StreamOffset.create("my-stream", ReadOffset.from("0-0")), queue::addAll);
 
 		subscription.await(DEFAULT_TIMEOUT);
 
@@ -168,7 +168,7 @@ void shouldReceiveMessagesInConsumerGroup() throws InterruptedException {
 
 		container.start();
 		Subscription subscription = container.receive(Consumer.from("my-group", "my-consumer"),
-				StreamOffset.create("my-stream", ReadOffset.lastConsumed()), queue::add);
+				StreamOffset.create("my-stream", ReadOffset.lastConsumed()), queue::addAll);
 
 		subscription.await(DEFAULT_TIMEOUT);
 
@@ -194,7 +194,7 @@ void shouldReceiveAndAckMessagesInConsumerGroup() throws InterruptedException {
 
 		container.start();
 		Subscription subscription = container.receiveAutoAck(Consumer.from("my-group", "my-consumer"),
-				StreamOffset.create("my-stream", ReadOffset.lastConsumed()), queue::add);
+				StreamOffset.create("my-stream", ReadOffset.lastConsumed()), queue::addAll);
 
 		subscription.await(DEFAULT_TIMEOUT);
 
@@ -316,7 +316,7 @@ void deserializationShouldContinueStreamRead() throws InterruptedException {
 		redisTemplate.opsForStream().add("my-stream", Collections.singletonMap("payload", "3"));
 
 		container.start();
-		Subscription subscription = container.register(readRequest, records::add);
+		Subscription subscription = container.register(readRequest, records::addAll);
 
 		subscription.await(DEFAULT_TIMEOUT);
 
@@ -347,7 +347,7 @@ void cancelledStreamShouldNotReceiveMessages() throws InterruptedException {
 		BlockingQueue<MapRecord<String, String, String>> queue = new LinkedBlockingQueue<>();
 
 		container.start();
-		Subscription subscription = container.receive(StreamOffset.create("my-stream", ReadOffset.from("0-0")), queue::add);
+		Subscription subscription = container.receive(StreamOffset.create("my-stream", ReadOffset.from("0-0")), queue::addAll);
 
 		subscription.await(DEFAULT_TIMEOUT);
 		cancelAwait(subscription);
@@ -365,7 +365,7 @@ void containerRestartShouldRestartSubscription() throws InterruptedException {
 		BlockingQueue<MapRecord<String, String, String>> queue = new LinkedBlockingQueue<>();
 
 		container.start();
-		Subscription subscription = container.receive(StreamOffset.create("my-stream", ReadOffset.from("0-0")), queue::add);
+		Subscription subscription = container.receive(StreamOffset.create("my-stream", ReadOffset.from("0-0")), queue::addAll);
 
 		subscription.await(DEFAULT_TIMEOUT);