[HUDI-2801] Add Amazon CloudWatch metrics reporter (#4081)

hudi-client/hudi-client-common/src/test/java/org/apache/hudi/metrics/cloudwatch/TestCloudWatchMetricsReporter.java

@@ -0,0 +1,62 @@
+/*
+ * 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.metrics.cloudwatch;
+
+import org.apache.hudi.aws.cloudwatch.CloudWatchReporter;
+import org.apache.hudi.config.HoodieWriteConfig;
+
+import com.codahale.metrics.MetricRegistry;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.concurrent.TimeUnit;
+
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+public class TestCloudWatchMetricsReporter {
+
+  @Mock
+  private HoodieWriteConfig config;
+
+  @Mock
+  private MetricRegistry registry;
+
+  @Mock
+  private CloudWatchReporter reporter;
+
+  @Test
+  public void testReporter() {
+    when(config.getCloudWatchReportPeriodSeconds()).thenReturn(30);
+    CloudWatchMetricsReporter metricsReporter = new CloudWatchMetricsReporter(config, registry, reporter);
+
+    metricsReporter.start();
+    verify(reporter, times(1)).start(30, TimeUnit.SECONDS);
+
+    metricsReporter.report();
+    verify(reporter, times(1)).report();
+
+    metricsReporter.stop();
+    verify(reporter, times(1)).stop();
+  }
+}