content: /*
   * 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 com.datastax.oss.driver.internal.core.metrics;
  
  import com.datastax.oss.driver.api.core.config.DefaultDriverOption;
  import com.datastax.oss.driver.api.core.config.DriverExecutionProfile;
  import com.datastax.oss.driver.api.core.context.DriverContext;
  import com.datastax.oss.driver.api.core.metadata.Node;
  import com.datastax.oss.driver.api.core.metrics.Metrics;
  import java.util.List;
  import java.util.Optional;
  import net.jcip.annotations.ThreadSafe;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  @ThreadSafe
  public class NoopMetricsFactory implements MetricsFactory {
  
    private static final Logger LOG = LoggerFactory.getLogger(NoopMetricsFactory.class);
  
    @SuppressWarnings("unused")
    public NoopMetricsFactory(DriverContext context) {
      String logPrefix = context.getSessionName();
      DriverExecutionProfile config = context.getConfig().getDefaultProfile();
      List<String> enabledSessionMetrics =
          config.getStringList(DefaultDriverOption.METRICS_SESSION_ENABLED);
      List<String> enabledNodeMetrics =
          config.getStringList(DefaultDriverOption.METRICS_NODE_ENABLED);
      if (!enabledSessionMetrics.isEmpty() || !enabledNodeMetrics.isEmpty()) {
        LOG.warn(
            "[{}] Some session-level or node-level metrics were enabled, "
                + "but NoopMetricsFactory is being used: all metrics will be empty",
            logPrefix);
      }
    }
  
    @Override
    public Optional<Metrics> getMetrics() {
      return Optional.empty();
    }
  
    @Override
    public SessionMetricUpdater getSessionUpdater() {
      return NoopSessionMetricUpdater.INSTANCE;
    }
  
    @Override
    public NodeMetricUpdater newNodeUpdater(Node node) {
      return NoopNodeMetricUpdater.INSTANCE;
    }
  }
  