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Interfaces to be implemented in order to smooth over hadoop version differences

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/*
 * 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.thrift;

import org.apache.yetus.audience.InterfaceAudience;

/**
 * Class used to create metrics sources for Thrift and Thrift2 servers.
 */
@InterfaceAudience.Private
public class MetricsThriftServerSourceFactoryImpl implements MetricsThriftServerSourceFactory {

  /**
   * A singleton used to make sure that only one thrift metrics source per server type is ever
   * created.
   */
  @SuppressWarnings("ImmutableEnumChecker")
  private enum FactoryStorage {
    INSTANCE;

    private MetricsThriftServerSourceImpl thriftOne;
    private MetricsThriftServerSourceImpl thriftTwo;
  }

  @Override
  public MetricsThriftServerSource createThriftOneSource() {
    if (FactoryStorage.INSTANCE.thriftOne == null) {
      FactoryStorage.INSTANCE.thriftOne = new MetricsThriftServerSourceImpl(METRICS_NAME,
        METRICS_DESCRIPTION, THRIFT_ONE_METRICS_CONTEXT, THRIFT_ONE_JMX_CONTEXT);
    }
    return FactoryStorage.INSTANCE.thriftOne;
  }

  @Override
  public MetricsThriftServerSource createThriftTwoSource() {
    if (FactoryStorage.INSTANCE.thriftTwo == null) {
      FactoryStorage.INSTANCE.thriftTwo = new MetricsThriftServerSourceImpl(METRICS_NAME,
        METRICS_DESCRIPTION, THRIFT_TWO_METRICS_CONTEXT, THRIFT_TWO_JMX_CONTEXT);
    }
    return FactoryStorage.INSTANCE.thriftTwo;
  }
}