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Server functionality for HBase

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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.master;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
import org.apache.hadoop.hbase.master.MetricsMasterSource;
import org.apache.hadoop.hbase.master.MetricsMasterSourceFactory;
import org.apache.hadoop.hbase.master.MetricsMasterWrapper;

/**
 * This class is for maintaining the various master statistics
 * and publishing them through the metrics interfaces.
 * 
 * This class has a number of metrics variables that are publicly accessible;
 * these variables (objects) have methods to update their values.
 */
@InterfaceStability.Evolving
@InterfaceAudience.Private
public class MetricsMaster {
  private final Log LOG = LogFactory.getLog(this.getClass());
  private MetricsMasterSource masterSource;

  public MetricsMaster(MetricsMasterWrapper masterWrapper) {
    masterSource = CompatibilitySingletonFactory.getInstance(MetricsMasterSourceFactory.class).create(masterWrapper);
  }

  // for unit-test usage
  public MetricsMasterSource getMetricsSource() {
    return masterSource;
  }

  /**
   * @param inc How much to add to requests.
   */
  public void incrementRequests(final int inc) {
    masterSource.incRequests(inc);
  }
}