hadoop MetricsRecordImpl 源码
haddop MetricsRecordImpl 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/impl/MetricsRecordImpl.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.impl;
import java.util.List;
import static org.apache.hadoop.util.Preconditions.*;
import org.apache.hadoop.classification.VisibleForTesting;
import org.apache.hadoop.metrics2.MetricsInfo;
import org.apache.hadoop.metrics2.AbstractMetric;
import org.apache.hadoop.metrics2.MetricsTag;
import static org.apache.hadoop.metrics2.util.Contracts.*;
@VisibleForTesting
public class MetricsRecordImpl extends AbstractMetricsRecord {
protected static final String DEFAULT_CONTEXT = "default";
private final long timestamp;
private final MetricsInfo info;
private final List<MetricsTag> tags;
private final Iterable<AbstractMetric> metrics;
/**
* Construct a metrics record
* @param info {@link MetricsInfo} of the record
* @param timestamp of the record
* @param tags of the record
* @param metrics of the record
*/
public MetricsRecordImpl(MetricsInfo info, long timestamp,
List<MetricsTag> tags,
Iterable<AbstractMetric> metrics) {
this.timestamp = checkArg(timestamp, timestamp > 0, "timestamp");
this.info = checkNotNull(info, "info");
this.tags = checkNotNull(tags, "tags");
this.metrics = checkNotNull(metrics, "metrics");
}
@Override public long timestamp() {
return timestamp;
}
@Override public String name() {
return info.name();
}
MetricsInfo info() {
return info;
}
@Override public String description() {
return info.description();
}
@Override public String context() {
// usually the first tag
for (MetricsTag t : tags) {
if (t.info() == MsInfo.Context) {
return t.value();
}
}
return DEFAULT_CONTEXT;
}
@Override
public List<MetricsTag> tags() {
return tags; // already unmodifiable from MetricsRecordBuilderImpl#tags
}
@Override public Iterable<AbstractMetric> metrics() {
return metrics;
}
}
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