[GitHub] [pulsar] eolivelli commented on a change in pull request #9270: [pulsar-broker] Make tenant rest-api async and use metadata-store api

[GitBox <gi...@apache.org>]

eolivelli commented on a change in pull request #9270:
URL: https://github.com/apache/pulsar/pull/9270#discussion_r562898653



##########
File path: pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/BaseResources.java
##########
@@ -0,0 +1,117 @@
+/**
+ * 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.admin.impl;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.function.Function;
+import lombok.Getter;
+import org.apache.pulsar.broker.PulsarServerException;
+import org.apache.pulsar.metadata.api.MetadataCache;
+import org.apache.pulsar.metadata.api.extended.MetadataStoreExtended;
+
+/**
+ * Base class for all configuration resources to access configurations from metadata-store.
+ *
+ * @param <T>
+ *            type of configuration-resources.
+ */
+public class BaseResources<T> {
+
+    @Getter
+    private final MetadataStoreExtended store;
+    @Getter
+    private final MetadataCache<T> cache;
+
+    public BaseResources(MetadataStoreExtended store, Class<T> clazz) {
+        this.store = store;
+        this.cache = store.getMetadataCache(clazz);
+    }
+
+    public CompletableFuture<List<String>> getChildren(String path) {
+        return cache.getChildren(path);
+    }
+
+    public Optional<T> get(String path) throws PulsarServerException {
+        try {
+            return getAsync(path).get();
+        } catch (Exception e) {
+            throw new PulsarServerException("Failed to get data from " + path,
+                    (e instanceof ExecutionException) ? e.getCause() : e);
+        }
+    }
+
+    public CompletableFuture<Optional<T>> getAsync(String path) {
+        return cache.get(path);
+    }
+
+    public void set(String path, Function<T, T> modifyFunction) throws PulsarServerException {
+        try {
+            setAsync(path, modifyFunction).get();
+        } catch (Exception e) {
+            throw new PulsarServerException("Failed to set data for " + path,
+                    (e instanceof ExecutionException) ? e.getCause() : e);
+        }
+    }
+
+    public CompletableFuture<Void> setAsync(String path, Function<T, T> modifyFunction) {
+        return cache.readModifyUpdate(path, modifyFunction);
+    }
+
+    public void create(String path, T data) throws PulsarServerException {
+        try {
+            createAsync(path, data).get();
+        } catch (Exception e) {
+            throw new PulsarServerException("Failed to create " + path,
+                    (e instanceof ExecutionException) ? e.getCause() : e);
+        }
+    }
+
+    public CompletableFuture<Void> createAsync(String path, T data) {
+        return cache.readModifyUpdateOrCreate(path, t -> data);
+    }
+
+    public void delete(String path) throws PulsarServerException {
+        try {
+            deleteAsync(path).get();
+        } catch (Exception e) {
+            throw new PulsarServerException("Failed to delete " + path,
+                    (e instanceof ExecutionException) ? e.getCause() : e);
+        }
+    }
+
+    public CompletableFuture<Void> deleteAsync(String path) {
+        return cache.delete(path);
+    }
+
+    public Boolean exists(String path) throws PulsarServerException {

Review comment:
       Should the return type be `boolean` ?




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