/*
* Copyright 2013 NGDATA nv
*
* 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 com.ngdata.hbaseindexer.metrics;
import java.util.SortedMap;
import com.yammer.metrics.Metrics;
import com.yammer.metrics.core.Metric;
import com.yammer.metrics.core.MetricName;
import com.yammer.metrics.core.MetricPredicate;
public class IndexerMetricsUtil {
public static final String METRIC_GROUP = "hbaseindexer";
public static void shutdownMetrics(String indexerName) {
SortedMap<String, SortedMap<MetricName, Metric>> groupedMetrics = Metrics.defaultRegistry().groupedMetrics(
new IndexerMetricPredicate(indexerName));
for (SortedMap<MetricName, Metric> metricMap : groupedMetrics.values()) {
for (MetricName metricName : metricMap.keySet()) {
Metrics.defaultRegistry().removeMetric(metricName);
}
}
}
/**
* MetricPredicate that matches all HBase Indexer metrics. An indexer name
* can optionally be given to only map metrics for a given indexer.
*/
public static class IndexerMetricPredicate implements MetricPredicate {
private String indexerName;
/**
* Instantiate a predicate that matches all HBase Indexer metrics.
*/
public IndexerMetricPredicate() {
this(null);
}
/**
* Instantiate a predicate that matches metrics for a given indexer.
* @param indexerName
*/
public IndexerMetricPredicate(String indexerName) {
this.indexerName = indexerName;
}
@Override
public boolean matches(MetricName metricName, Metric metric) {
if (indexerName == null) {
return METRIC_GROUP.equals(metricName.getGroup());
} else {
return METRIC_GROUP.equals(metricName.getGroup()) && indexerName.equals(metricName.getScope());
}
}
}
/**
* Create a {@code MetricName} instance for a specific indexer.
*
* @param producerClass class producing the metric
* @param metric name of the metric
* @param indexerName name of the indexer
* @return {@code MetricName} instance scoped to the given indexer name
*/
public static MetricName metricName(Class<?> producerClass, String metric, String indexerName) {
return new MetricName("hbaseindexer", producerClass.getSimpleName(), metric, indexerName);
}
}