/*
* Copyright 2012-2017 the original author or authors.
*
* 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 org.springframework.boot.actuate.metrics.reader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.springframework.boot.actuate.metrics.Metric;
/**
* Composite implementation of {@link MetricReader}.
*
* @author Dave Syer
*/
public class CompositeMetricReader implements MetricReader {
private final List<MetricReader> readers = new ArrayList<>();
public CompositeMetricReader(MetricReader... readers) {
Collections.addAll(this.readers, readers);
}
@Override
public Metric<?> findOne(String metricName) {
for (MetricReader delegate : this.readers) {
Metric<?> value = delegate.findOne(metricName);
if (value != null) {
return value;
}
}
return null;
}
@Override
public Iterable<Metric<?>> findAll() {
List<Metric<?>> values = new ArrayList<>((int) count());
for (MetricReader delegate : this.readers) {
Iterable<Metric<?>> all = delegate.findAll();
for (Metric<?> value : all) {
values.add(value);
}
}
return values;
}
@Override
public long count() {
long count = 0;
for (MetricReader delegate : this.readers) {
count += delegate.count();
}
return count;
}
}