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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.giraph.metrics;
20  
21  import org.apache.log4j.Logger;
22  
23  import com.yammer.metrics.core.Metric;
24  import com.yammer.metrics.core.MetricName;
25  import com.yammer.metrics.core.MetricsRegistryListener;
26  
27  /**
28   * A simple MetricsRegistry listener that prints every Metric added/removed.
29   */
30  public class MetricsRegistryDebugger implements MetricsRegistryListener {
31    /** logger instance */
32    private static final Logger LOG =
33        Logger.getLogger(MetricsRegistryDebugger.class);
34    /** static singleton instance */
35    private static final MetricsRegistryDebugger INSTANCE =
36        new MetricsRegistryDebugger();
37  
38    /**
39     * Get singleton static instance of this class.
40     *
41     * @return singleton static instance.
42     */
43    public static MetricsRegistryDebugger get() {
44      return INSTANCE;
45    }
46  
47    @Override
48    public void onMetricAdded(MetricName name, Metric metric) {
49      LOG.info("Adding metric " + name + " - " +
50          metric.getClass().getSimpleName());
51    }
52  
53    @Override
54    public void onMetricRemoved(MetricName name) {
55      LOG.info("Removing metric " + name);
56    }
57  }