[HUDI-1025] Meter RPC calls in HoodieWrapperFileSystem (#1916)

hudi-common/src/test/java/org/apache/hudi/common/TestRegistry.java

@@ -0,0 +1,75 @@
+/*
+ * 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.hudi.common;
+
+import org.apache.hudi.common.metrics.Registry;
+import org.junit.jupiter.api.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class TestRegistry {
+
+  @Test
+  public void testGetRegistry() throws Exception {
+    Registry r = Registry.getRegistry("testGetRegistry_1");
+    assertEquals(r, Registry.getRegistry("testGetRegistry_1"));
+  }
+
+  private void registerMetrics(Map<String, Long> map, Registry registry) {
+    map.forEach((k, v) -> registry.add(k, v));
+  }
+
+  @Test
+  public void testGetAllMetrics() throws Exception {
+    String registryName = "testGetAllMetrics";
+    Registry r = Registry.getRegistry(registryName);
+    Map<String, Long> countsMap = new HashMap<>();
+
+    countsMap.put("one", 1L);
+    registerMetrics(countsMap, r);
+    Map<String, Long> allMetrics1 = Registry.getAllMetrics(false, true);
+    assertTrue(allMetrics1.containsKey(registryName + ".one"));
+
+    countsMap.remove("one");
+    countsMap.put("two", 2L);
+    registerMetrics(countsMap, r);
+    Map<String, Long> allMetrics2 = Registry.getAllMetrics(true, true);
+    assertTrue(allMetrics2.containsKey(registryName + ".one"));
+    assertTrue(allMetrics2.containsKey(registryName + ".two"));
+
+    Map<String, Long> allMetrics3 = Registry.getAllMetrics(false, true);
+    assertTrue(allMetrics3.isEmpty());
+  }
+
+  @Test
+  public void testCounts() throws Exception {
+    Registry r = Registry.getRegistry("testCounts");
+    Map<String, Long> countsMap = new HashMap<>();
+    countsMap.put("one", 1L);
+    countsMap.put("two", 2L);
+
+    registerMetrics(countsMap, r);
+    assertEquals(countsMap, r.getAllCounts());
+  }
+
+}