[GitHub] [pulsar] codelipenghui commented on a change in pull request #4955: [WIP] [PIP-39] Introduce system topic and topic policies service

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codelipenghui commented on a change in pull request #4955: [WIP] [PIP-39] Introduce system topic and topic policies service
URL: https://github.com/apache/pulsar/pull/4955#discussion_r316479721
 
 

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 File path: pulsar-broker/src/main/java/org/apache/pulsar/broker/service/TopicPoliciesService.java
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+/**
+ * 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 com.google.common.annotations.VisibleForTesting;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import com.google.common.cache.RemovalListener;
+import org.apache.pulsar.broker.PulsarServerException;
+import org.apache.pulsar.broker.PulsarService;
+import org.apache.pulsar.broker.systopic.EventType;
+import org.apache.pulsar.broker.systopic.NamespaceEventsSystemTopicFactory;
+import org.apache.pulsar.broker.systopic.SystemTopic;
+import org.apache.pulsar.broker.systopic.TopicEvent;
+import org.apache.pulsar.common.naming.NamespaceName;
+import org.apache.pulsar.common.naming.TopicName;
+import org.apache.pulsar.common.policies.data.TopicPolicies;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Topic policies service
+ */
+public class TopicPoliciesService {
+
+    private final PulsarService pulsarService;
+    private NamespaceEventsSystemTopicFactory namespaceEventsSystemTopicFactory;
+
+    private final Map<TopicName, TopicPolicies> policiesCache = new ConcurrentHashMap<>();
+
+    private final LoadingCache<NamespaceName, CompletableFuture<SystemTopic.Reader>> readerCache;
 
 Review comment:
   Topic policies service will check the reader is have no more events can read before get topic policies, so when a reader evicted, the topic policies service will create a new reader and cache it.

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