io.micronaut.discovery.CompositeDiscoveryClient Maven / Gradle / Ivy
/*
* Copyright 2017-2018 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
*
* 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 io.micronaut.discovery;
import io.micronaut.core.naming.NameUtils;
import io.micronaut.core.util.ArrayUtils;
import io.reactivex.Flowable;
import io.reactivex.Maybe;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* A composite implementation combining all registered {@link DiscoveryClient} instances.
*
* @author Graeme Rocher
* @since 1.0
*/
public abstract class CompositeDiscoveryClient implements DiscoveryClient {
private final DiscoveryClient[] discoveryClients;
/**
* Construct the CompositeDiscoveryClient from all discovery clients.
*
* @param discoveryClients The service discovery clients
*/
protected CompositeDiscoveryClient(DiscoveryClient[] discoveryClients) {
this.discoveryClients = discoveryClients;
}
@Override
public String getDescription() {
return toString();
}
@Override
public Flowable> getInstances(String serviceId) {
serviceId = NameUtils.hyphenate(serviceId);
if (ArrayUtils.isEmpty(discoveryClients)) {
return Flowable.just(Collections.emptyList());
}
String finalServiceId = serviceId;
Stream>> flowableStream = Arrays.stream(discoveryClients).map(client -> Flowable.fromPublisher(client.getInstances(finalServiceId)));
Maybe> reduced = Flowable.merge(flowableStream.collect(Collectors.toList())).reduce((instances, otherInstances) -> {
instances.addAll(otherInstances);
return instances;
});
return reduced.toFlowable();
}
@Override
public Flowable> getServiceIds() {
if (ArrayUtils.isEmpty(discoveryClients)) {
return Flowable.just(Collections.emptyList());
}
Stream>> flowableStream = Arrays.stream(discoveryClients).map(client -> Flowable.fromPublisher(client.getServiceIds()));
Maybe> reduced = Flowable.merge(flowableStream.collect(Collectors.toList())).reduce((strings, strings2) -> {
strings.addAll(strings2);
return strings;
});
return reduced.toFlowable();
}
@Override
public void close() throws IOException {
for (DiscoveryClient discoveryClient : discoveryClients) {
discoveryClient.close();
}
}
@Override
public String toString() {
return "compositeDiscoveryClient(" + Arrays.stream(discoveryClients).map(DiscoveryClient::getDescription).collect(Collectors.joining(",")) + ")";
}
}