hadoop RetryCacheMetrics 源码
haddop RetryCacheMetrics 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/metrics/RetryCacheMetrics.java
/**
* 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.ipc.metrics;
import org.apache.hadoop.ipc.RetryCache;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.metrics2.annotation.Metric;
import org.apache.hadoop.metrics2.annotation.Metrics;
import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
import org.apache.hadoop.metrics2.lib.MetricsRegistry;
import org.apache.hadoop.metrics2.lib.MutableCounterLong;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class is for maintaining the various RetryCache-related statistics
* and publishing them through the metrics interfaces.
*/
@InterfaceAudience.Private
@Metrics(about="Aggregate RetryCache metrics", context="rpc")
public class RetryCacheMetrics {
static final Logger LOG = LoggerFactory.getLogger(RetryCacheMetrics.class);
final MetricsRegistry registry;
final String name;
RetryCacheMetrics(RetryCache retryCache) {
name = "RetryCache."+ retryCache.getCacheName();
registry = new MetricsRegistry(name);
if (LOG.isDebugEnabled()) {
LOG.debug("Initialized "+ registry);
}
}
public String getName() { return name; }
public static RetryCacheMetrics create(RetryCache cache) {
RetryCacheMetrics m = new RetryCacheMetrics(cache);
return DefaultMetricsSystem.instance().register(m.name, null, m);
}
@Metric("Number of RetryCache hit") MutableCounterLong cacheHit;
@Metric("Number of RetryCache cleared") MutableCounterLong cacheCleared;
@Metric("Number of RetryCache updated") MutableCounterLong cacheUpdated;
/**
* One cache hit event
*/
public void incrCacheHit() {
cacheHit.incr();
}
/**
* One cache cleared
*/
public void incrCacheCleared() {
cacheCleared.incr();
}
/**
* One cache updated
*/
public void incrCacheUpdated() {
cacheUpdated.incr();
}
public long getCacheHit() {
return cacheHit.value();
}
public long getCacheCleared() {
return cacheCleared.value();
}
public long getCacheUpdated() {
return cacheUpdated.value();
}
}
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