content: /*
   * Copyright (C) 2012 Facebook, Inc.
   *
   * Licensed 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 io.airlift.drift.server.stats;
  
  import com.google.inject.Inject;
  import io.airlift.drift.codec.metadata.ThriftServiceMetadata;
  import io.airlift.drift.transport.MethodMetadata;
  import org.weakref.jmx.MBeanExporter;
  import org.weakref.jmx.ObjectNameBuilder;
  
  import java.io.Closeable;
  import java.util.Map;
  import java.util.Optional;
  import java.util.concurrent.ConcurrentHashMap;
  
  import static java.util.Objects.requireNonNull;
  
  public class JmxMethodInvocationStatsFactory
          implements Closeable, MethodInvocationStatsFactory
  {
      private final MBeanExporter exporter;
      private final Map<String, MethodInvocationStat> stats = new ConcurrentHashMap<>();
  
      @Inject
      public JmxMethodInvocationStatsFactory(MBeanExporter exporter)
      {
          this.exporter = requireNonNull(exporter, "exporter is null");
      }
  
      @Override
      public synchronized MethodInvocationStat getStat(ThriftServiceMetadata serviceMetadata, Optional<String> qualifier, MethodMetadata metadata)
      {
          ObjectNameBuilder objectNameBuilder = new ObjectNameBuilder("thrift.server");
          objectNameBuilder.withProperty("name", serviceMetadata.getName());
          qualifier.ifPresent(qualifierName -> objectNameBuilder.withProperty("type", qualifierName));
          objectNameBuilder.withProperty("method", metadata.getName());
          String objectName = objectNameBuilder.build();
  
          return stats.computeIfAbsent(objectName, name -> {
              JmxMethodInvocationStat stat = new JmxMethodInvocationStat(metadata.getName());
              exporter.export(objectName, stat);
              return stat;
          });
      }
  
      @Override
      public synchronized void close()
      {
          for (String name : stats.keySet()) {
              exporter.unexport(name);
          }
          stats.clear();
      }
  }
  