com.netflix.servo.publish.MetricTransformObserver Maven / Gradle / Ivy
/**
* Copyright 2013 Netflix, Inc.
*
* Licensed 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 com.netflix.servo.publish;
import com.google.common.base.Function;
import com.netflix.servo.Metric;
import java.util.List;
import java.util.stream.Collectors;
/**
* An observer that will transform the list of metrics using a given function.
*/
public class MetricTransformObserver implements MetricObserver {
private final Function transformer;
private final MetricObserver observer;
/**
* Create a new MetricTransformObserver using the given transfomer function.
*
* @param transformer The function used to transform metrics.
* @param observer The MetricObserver that will receive the transfomed metrics.
*/
public MetricTransformObserver(Function transformer, MetricObserver observer) {
this.transformer = transformer;
this.observer = observer;
}
@Override
public void update(List metrics) {
List transformed = metrics.stream()
.map(transformer::apply).collect(Collectors.toList());
observer.update(transformed);
}
@Override
public String getName() {
return "MetricTransformObserver";
}
}