YARN-11326. [Federation] Add RM FederationStateStoreService Metrics.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/federation/FederationClientMethod.java

@@ -0,0 +1,121 @@
+/**
+ * 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.hadoop.yarn.server.resourcemanager.federation;
+
+import org.apache.hadoop.yarn.exceptions.YarnException;
+import org.apache.hadoop.yarn.server.federation.store.FederationStateStore;
+import org.apache.hadoop.yarn.util.Clock;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.lang.reflect.Method;
+import java.util.Arrays;
+
+/**
+ * Class to define client method,params and arguments.
+ */
+public class FederationClientMethod<R> {
+
+  public static final Logger LOG =
+      LoggerFactory.getLogger(FederationClientMethod.class);
+
+  /**
+   * List of parameters: static and dynamic values, matchings types.
+   */
+  private final Object[] params;
+
+  /**
+   * List of method parameters types, matches parameters.
+   */
+  private final Class<?>[] types;
+
+  /**
+   * String name of the method.
+   */
+  private final String methodName;
+
+  private FederationStateStore stateStoreClient = null;
+
+  private Clock clock = null;
+
+  private Class<R> clazz;
+
+  public FederationClientMethod(String method, Class<?>[] pTypes, Object... pParams)
+      throws YarnException {
+    if (pParams.length != pTypes.length) {
+      throw new YarnException("Invalid parameters for method " + method);
+    }
+
+    this.params = pParams;
+    this.types = Arrays.copyOf(pTypes, pTypes.length);
+    this.methodName = method;
+  }
+
+  public FederationClientMethod(String method, Class pTypes, Object pParams)
+      throws YarnException {
+    this(method, new Class[]{pTypes}, new Object[]{pParams});
+  }
+
+  public FederationClientMethod(String method, Class pTypes, Object pParams, Class<R> rTypes,
+      FederationStateStore fedStateStore, Clock fedClock) throws YarnException {
+    this(method, pTypes, pParams);
+    this.stateStoreClient = fedStateStore;
+    this.clock = fedClock;
+    this.clazz = rTypes;
+  }
+
+  public Object[] getParams() {
+    return Arrays.copyOf(this.params, this.params.length);
+  }
+
+  public String getMethodName() {
+    return methodName;
+  }
+
+  /**
+   * Get the calling types for this method.
+   *
+   * @return An array of calling types.
+   */
+  public Class<?>[] getTypes() {
+    return Arrays.copyOf(this.types, this.types.length);
+  }
+
+  /**
+   * We will use the invoke method to call the method in FederationStateStoreService.
+   *
+   * @return The result returned after calling the interface.
+   * @throws YarnException yarn exception.
+   */
+  protected R invoke() throws YarnException {
+    try {
+      long startTime = clock.getTime();
+      Method method = FederationStateStore.class.getMethod(methodName, types);
+      R result = clazz.cast(method.invoke(stateStoreClient, params));
+
+      long stopTime = clock.getTime();
+      FederationStateStoreServiceMetrics.succeededStateStoreServiceCall(
+          methodName, stopTime - startTime);
+      return result;
+    } catch (Exception e) {
+      LOG.error("stateStoreClient call method {} error.", methodName, e);
+      FederationStateStoreServiceMetrics.failedStateStoreServiceCall(methodName);
+      throw new YarnException(e);
+    }
+  }
+}