hadoop MetricsRecord 源码
haddop MetricsRecord 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/MetricsRecord.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.metrics2;
import java.util.Collection;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* An immutable snapshot of metrics with a timestamp
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface MetricsRecord {
/**
* Get the timestamp of the metrics
* @return the timestamp
*/
long timestamp();
/**
* @return the metrics record name
*/
String name();
/**
* @return the description of the metrics record
*/
String description();
/**
* @return the context name of the metrics record
*/
String context();
/**
* Get the tags of the record
* Note: returning a collection instead of iterable as we
* need to use tags as keys (hence Collection#hashCode etc.) in maps
* @return an unmodifiable collection of tags
*/
Collection<MetricsTag> tags();
/**
* Get the metrics of the record
* @return an immutable iterable interface for metrics
*/
Iterable<AbstractMetric> metrics();
}
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