io.micronaut.management.endpoint.info.impl.ReactiveInfoAggregator Maven / Gradle / Ivy
/*
* Copyright 2017-2020 original 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
*
* https://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 io.micronaut.management.endpoint.info.impl;
import io.micronaut.context.annotation.Requires;
import io.micronaut.context.env.EmptyPropertySource;
import io.micronaut.context.env.PropertySource;
import io.micronaut.context.env.PropertySourcePropertyResolver;
import io.micronaut.core.convert.format.MapFormat;
import io.micronaut.core.naming.conventions.StringConvention;
import io.micronaut.management.endpoint.info.InfoAggregator;
import io.micronaut.management.endpoint.info.InfoEndpoint;
import io.micronaut.management.endpoint.info.InfoSource;
import jakarta.inject.Singleton;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import java.util.AbstractMap;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* Default implementation of {@link InfoAggregator}.
*
* @author James Kleeh
* @author Zachary Klein
* @since 1.0
*/
@Singleton
@Requires(beans = InfoEndpoint.class)
public class ReactiveInfoAggregator implements InfoAggregator> {
@Override
public Publisher> aggregate(InfoSource[] sources) {
return aggregateResults(sources)
.collectList()
.map((List> list) -> {
var resolver = new PropertySourcePropertyResolver();
list.stream()
.sorted((e1, e2) -> Integer.compare(e2.getKey(), e1.getKey()))
.forEach(entry -> resolver.addPropertySource(entry.getValue()));
return resolver.getAllProperties(StringConvention.RAW, MapFormat.MapTransformation.NESTED);
}).flux();
}
/**
* Create a {@link Flux} of ordered {@link PropertySource} from an array of {@link InfoSource}.
*
* @param sources Array of {@link InfoSource}
* @return An {@link Flux} of {@link java.util.Map.Entry}, where the key is an {@link Integer} and value is the
* {@link PropertySource} returned by the {@link InfoSource}
*/
protected Flux> aggregateResults(InfoSource[] sources) {
List>> publishers = new ArrayList<>(sources.length);
for (int i = 0; i < sources.length; i++) {
int index = i;
Mono> single = Mono.from(sources[i].getSource())
.defaultIfEmpty(new EmptyPropertySource())
.map(source -> new AbstractMap.SimpleEntry<>(index, source));
publishers.add(single.flux());
}
return Flux.merge(publishers);
}
}