/**
    *
    * 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.hbase.ipc;
  
  import java.util.HashMap;
  import java.util.Locale;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  
  @InterfaceAudience.Private
  public class MetricsHBaseServerSourceFactoryImpl extends MetricsHBaseServerSourceFactory {
    private enum SourceStorage {
      INSTANCE;
      HashMap<String, MetricsHBaseServerSource>
          sources =
          new HashMap<String, MetricsHBaseServerSource>();
  
    }
  
    @Override
    public MetricsHBaseServerSource create(String serverName, MetricsHBaseServerWrapper wrapper) {
      return getSource(serverName, wrapper);
    }
  
    private static synchronized MetricsHBaseServerSource getSource(String serverName,
                                                                   MetricsHBaseServerWrapper wrap) {
      String context = createContextName(serverName);
      MetricsHBaseServerSource source = SourceStorage.INSTANCE.sources.get(context);
  
      if (source == null) {
        //Create the source.
        source = new MetricsHBaseServerSourceImpl(
            context,
            METRICS_DESCRIPTION,
            context.toLowerCase(Locale.ROOT),
            context + METRICS_JMX_CONTEXT_SUFFIX, wrap);
  
        //Store back in storage
        SourceStorage.INSTANCE.sources.put(context, source);
      }
  
      return source;
  
    }
  
  }