dao-jun commented on code in PR #19641:
URL: https://github.com/apache/pulsar/pull/19641#discussion_r1118850555
##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/SystemTopicTxnBufferSnapshotService.java:
##########
@@ -18,66 +18,154 @@
*/
package org.apache.pulsar.broker.service;
+import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicLong;
+import lombok.extern.slf4j.Slf4j;
import org.apache.pulsar.broker.systopic.NamespaceEventsSystemTopicFactory;
import org.apache.pulsar.broker.systopic.SystemTopicClient;
import org.apache.pulsar.broker.systopic.SystemTopicClientBase;
import org.apache.pulsar.client.api.PulsarClient;
import org.apache.pulsar.client.api.PulsarClientException;
import org.apache.pulsar.common.events.EventType;
+import org.apache.pulsar.common.naming.NamespaceName;
import org.apache.pulsar.common.naming.TopicName;
-import org.apache.pulsar.common.util.FutureUtil;
+@Slf4j
public class SystemTopicTxnBufferSnapshotService<T> {
- protected final Map<TopicName, SystemTopicClient<T>> clients;
+ protected final ConcurrentHashMap<NamespaceName, SystemTopicClient<T>>
clients;
protected final NamespaceEventsSystemTopicFactory
namespaceEventsSystemTopicFactory;
protected final Class<T> schemaType;
protected final EventType systemTopicType;
+ private final HashMap<NamespaceName, ReferenceCountedWriter<T>>
refCountedWriterMap;
+
+ // The class ReferenceCountedWriter will maintain the reference count,
+ // when the reference count decrement to 0, it will be removed from
writerFutureMap, the writer will be closed.
+ public static class ReferenceCountedWriter<T> {
+
+ private final AtomicLong referenceCount;
+ private final NamespaceName namespaceName;
+ private final CompletableFuture<SystemTopicClient.Writer<T>> future;
+ private final SystemTopicTxnBufferSnapshotService<T> snapshotService;
+
+ public ReferenceCountedWriter(NamespaceName namespaceName,
+
CompletableFuture<SystemTopicClient.Writer<T>> future,
+ SystemTopicTxnBufferSnapshotService<T>
snapshotService) {
+ this.referenceCount = new AtomicLong(1);
+ this.namespaceName = namespaceName;
+ this.snapshotService = snapshotService;
+ this.future = future;
+ this.future.exceptionally(t -> {
+ log.error("[{}] Failed to create transaction buffer
snapshot writer.", namespaceName, t);
+ snapshotService.refCountedWriterMap.remove(namespaceName,
this);
+ return null;
+ });
+ }
+
+ public CompletableFuture<SystemTopicClient.Writer<T>> getFuture() {
+ return future;
+ }
+
+ private void retain() {
+ operationValidate(true);
+ this.referenceCount.incrementAndGet();
+ }
+
+ private long release() {
+ operationValidate(false);
+ return this.referenceCount.decrementAndGet();
+ }
+
+ private void operationValidate(boolean isRetain) {
+ if (this.referenceCount.get() == 0) {
+ throw new RuntimeException(
+ "[" + namespaceName + "] The reference counted
transaction buffer snapshot writer couldn't "
+ + "be " + (isRetain ? "retained" : "released")
+ ", refCnt is 0.");
+ }
+ }
+
+ public void close() {
+ if (release() == 0) {
+ snapshotService.refCountedWriterMap.remove(namespaceName,
this);
+ future.thenAccept(writer -> {
+ final String topicName =
writer.getSystemTopicClient().getTopicName().toString();
+ writer.closeAsync().exceptionally(t -> {
+ if (t != null) {
+ log.error("[{}] Failed to close writer.",
topicName, t);
+ } else {
+ if (log.isDebugEnabled()) {
+ log.debug("[{}] Success to close writer.",
topicName);
+ }
+ }
+ return null;
+ });
+ });
+ }
+ }
+
+ }
+
public SystemTopicTxnBufferSnapshotService(PulsarClient client, EventType
systemTopicType,
Class<T> schemaType) {
this.namespaceEventsSystemTopicFactory = new
NamespaceEventsSystemTopicFactory(client);
this.systemTopicType = systemTopicType;
this.schemaType = schemaType;
this.clients = new ConcurrentHashMap<>();
+ this.refCountedWriterMap = new HashMap<>();
Review Comment:
Maybe it's better to use ConcurrentHashMap?
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