/**
* 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.hive.common.metrics.metrics2;
import com.codahale.metrics.RatioGauge;
import org.apache.hadoop.hive.common.metrics.common.MetricsVariable;
/**
* Combines two numeric metric variables into one gauge type metric displaying their ratio
*/
public class MetricVariableRatioGauge extends RatioGauge {
private final MetricsVariable<Integer> numerator;
private final MetricsVariable<Integer> denominator;
public MetricVariableRatioGauge(MetricsVariable<Integer> numerator,
MetricsVariable<Integer> denominator) {
this.numerator = numerator;
this.denominator = denominator;
}
@Override
protected Ratio getRatio() {
Integer numValue = numerator.getValue();
Integer denomValue = denominator.getValue();
if(numValue != null && denomValue != null) {
return Ratio.of(numValue.doubleValue(), denomValue.doubleValue());
}
return Ratio.of(0d,0d);
}
}