hadoop GangliaMetricVisitor 源码
haddop GangliaMetricVisitor 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/sink/ganglia/GangliaMetricVisitor.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.sink.ganglia;
import org.apache.hadoop.metrics2.MetricsInfo;
import org.apache.hadoop.metrics2.MetricsVisitor;
import org.apache.hadoop.metrics2.sink.ganglia.AbstractGangliaSink.GangliaSlope;
/**
* Since implementations of Metric are not public, hence use a visitor to figure
* out the type and slope of the metric. Counters have "positive" slope.
*/
class GangliaMetricVisitor implements MetricsVisitor {
private static final String INT32 = "int32";
private static final String FLOAT = "float";
private static final String DOUBLE = "double";
private String type;
private GangliaSlope slope;
/**
* @return the type of a visited metric
*/
String getType() {
return type;
}
/**
* @return the slope of a visited metric. Slope is positive for counters and
* null for others
*/
GangliaSlope getSlope() {
return slope;
}
@Override
public void gauge(MetricsInfo info, int value) {
// MetricGaugeInt.class ==> "int32"
type = INT32;
slope = null; // set to null as cannot figure out from Metric
}
@Override
public void gauge(MetricsInfo info, long value) {
// MetricGaugeLong.class ==> "float"
type = FLOAT;
slope = null; // set to null as cannot figure out from Metric
}
@Override
public void gauge(MetricsInfo info, float value) {
// MetricGaugeFloat.class ==> "float"
type = FLOAT;
slope = null; // set to null as cannot figure out from Metric
}
@Override
public void gauge(MetricsInfo info, double value) {
// MetricGaugeDouble.class ==> "double"
type = DOUBLE;
slope = null; // set to null as cannot figure out from Metric
}
@Override
public void counter(MetricsInfo info, int value) {
// MetricCounterInt.class ==> "int32"
type = INT32;
// counters have positive slope
slope = GangliaSlope.positive;
}
@Override
public void counter(MetricsInfo info, long value) {
// MetricCounterLong.class ==> "float"
type = FLOAT;
// counters have positive slope
slope = GangliaSlope.positive;
}
}
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