hadoop MetricsTag 源码
haddop MetricsTag 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/MetricsTag.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 org.apache.hadoop.thirdparty.com.google.common.base.Objects;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import java.util.StringJoiner;
import static org.apache.hadoop.util.Preconditions.checkNotNull;
/**
* Immutable tag for metrics (for grouping on host/queue/username etc.)
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class MetricsTag implements MetricsInfo {
private final MetricsInfo info;
private final String value;
/**
* Construct the tag with name, description and value
* @param info of the tag
* @param value of the tag
*/
public MetricsTag(MetricsInfo info, String value) {
this.info = checkNotNull(info, "tag info");
this.value = value;
}
@Override public String name() {
return info.name();
}
@Override public String description() {
return info.description();
}
/**
* @return the info object of the tag
*/
public MetricsInfo info() {
return info;
}
/**
* Get the value of the tag
* @return the value
*/
public String value() {
return value;
}
@Override public boolean equals(Object obj) {
if (obj instanceof MetricsTag) {
final MetricsTag other = (MetricsTag) obj;
return Objects.equal(info, other.info()) &&
Objects.equal(value, other.value());
}
return false;
}
@Override public int hashCode() {
return Objects.hashCode(info, value);
}
@Override public String toString() {
return new StringJoiner(", ", this.getClass().getSimpleName() + "{", "}")
.add("info=" + info)
.add("value=" + value())
.toString();
}
}
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