| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.pulsar.broker.service; |
| |
| 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; |
| |
| @Slf4j |
| public class SystemTopicTxnBufferSnapshotService<T> { |
| |
| protected final ConcurrentHashMap<NamespaceName, SystemTopicClient<T>> clients; |
| protected final NamespaceEventsSystemTopicFactory namespaceEventsSystemTopicFactory; |
| |
| protected final Class<T> schemaType; |
| protected final EventType systemTopicType; |
| |
| private final ConcurrentHashMap<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 TB snapshot writer.", namespaceName, t); |
| snapshotService.refCountedWriterMap.remove(namespaceName, this); |
| return null; |
| }); |
| } |
| |
| public CompletableFuture<SystemTopicClient.Writer<T>> getFuture() { |
| return future; |
| } |
| |
| private synchronized boolean retain() { |
| return this.referenceCount.incrementAndGet() > 0; |
| } |
| |
| public synchronized void release() { |
| if (this.referenceCount.decrementAndGet() == 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 TB snapshot writer.", topicName, t); |
| } else { |
| if (log.isDebugEnabled()) { |
| log.debug("[{}] Success to close TB snapshot 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 ConcurrentHashMap<>(); |
| } |
| |
| public CompletableFuture<SystemTopicClient.Reader<T>> createReader(TopicName topicName) { |
| return getTransactionBufferSystemTopicClient(topicName.getNamespaceObject()).newReaderAsync(); |
| } |
| |
| public void removeClient(TopicName topicName, SystemTopicClientBase<T> transactionBufferSystemTopicClient) { |
| if (transactionBufferSystemTopicClient.getReaders().size() == 0 |
| && transactionBufferSystemTopicClient.getWriters().size() == 0) { |
| clients.remove(topicName.getNamespaceObject()); |
| } |
| } |
| |
| public ReferenceCountedWriter<T> getReferenceWriter(NamespaceName namespaceName) { |
| return refCountedWriterMap.compute(namespaceName, (k, v) -> { |
| if (v != null && v.retain()) { |
| return v; |
| } else { |
| return new ReferenceCountedWriter<>(namespaceName, |
| getTransactionBufferSystemTopicClient(namespaceName).newWriterAsync(), this); |
| } |
| }); |
| } |
| |
| private SystemTopicClient<T> getTransactionBufferSystemTopicClient(NamespaceName namespaceName) { |
| TopicName systemTopicName = NamespaceEventsSystemTopicFactory |
| .getSystemTopicName(namespaceName, systemTopicType); |
| if (systemTopicName == null) { |
| throw new RuntimeException(new PulsarClientException.InvalidTopicNameException( |
| "Can't get the TB system topic client for namespace " + namespaceName |
| + " with type " + systemTopicType + ".")); |
| } |
| |
| return clients.computeIfAbsent(namespaceName, |
| (v) -> namespaceEventsSystemTopicFactory |
| .createTransactionBufferSystemTopicClient(systemTopicName, this, schemaType)); |
| } |
| |
| public void close() throws Exception { |
| for (Map.Entry<NamespaceName, SystemTopicClient<T>> entry : clients.entrySet()) { |
| entry.getValue().close(); |
| } |
| } |
| |
| } |