/*
 * 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.phoenix.monitoring.connectionqueryservice;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.apache.phoenix.monitoring.ConnectionQueryServicesMetric;
import org.apache.phoenix.monitoring.HistogramDistribution;
import org.apache.phoenix.monitoring.MetricType;

/**
 * ConnectionQueryServicesMetricsManager will be replaced by this class when
 * {@link org.apache.phoenix.query.QueryServices#CONNECTION_QUERY_SERVICE_METRICS_ENABLED} flag is
 * set to false.
 */
public class NoOpConnectionQueryServicesMetricsManager
  extends ConnectionQueryServicesMetricsManager {

  public static final NoOpConnectionQueryServicesMetricsManager NO_OP_CONN_QUERY_SERVICES_METRICS_MANAGER =
    new NoOpConnectionQueryServicesMetricsManager();

  private NoOpConnectionQueryServicesMetricsManager() {
    super();
  }

  void updateMetricsValue(String connectionQueryServiceName, MetricType type, long value) {
  }

  Map<String, List<ConnectionQueryServicesMetric>> getConnectionQueryServicesMetrics() {
    return Collections.emptyMap();
  }

  Map<String, List<HistogramDistribution>> getHistogramsForConnectionQueryServices() {
    return Collections.emptyMap();
  }

  void clearConnectionQueryServiceMetrics() {

  }

  ConnectionQueryServicesMetrics
    getConnectionQueryServiceMetricsInstance(String connectionQueryServiceName) {
    return null;
  }
}
