/**
* Copyright 2015-2016 Red Hat, Inc, and individual contributors.
*
* 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.wildfly.swarm.topology.consul.runtime;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import com.google.common.net.HostAndPort;
import com.orbitz.consul.cache.ConsulCache.Listener;
import com.orbitz.consul.model.health.ServiceHealth;
import org.wildfly.swarm.topology.runtime.TopologyManager;
import org.wildfly.swarm.topology.runtime.Registration;
/**
* Service-cache listener.
*
* This cache listener is responsible for receiving notifications
* of cache changes and calculating the differences to apply to the
* underlying TopologyManager.
*
* @author John Hovell
* @author Bob McWhirter
*/
public class ServiceCacheListener implements Listener<HostAndPort, ServiceHealth> {
public ServiceCacheListener(String name, TopologyManager topologyManager) {
this.name = name;
this.topologyManager = topologyManager;
}
@Override
public void notify(Map<HostAndPort, ServiceHealth> newValues) {
Set<Registration> previousEntries = topologyManager.registrationsForService(this.name);
Set<Registration> newEntries = newValues.values().stream()
.map(e -> new Registration("consul",
this.name,
e.getService().getAddress(),
e.getService().getPort())
.addTags(e.getService().getTags())
)
.collect(Collectors.toSet());
previousEntries.stream()
.filter(e -> !newEntries.contains(e))
.forEach(e -> {
this.topologyManager.unregister(e);
});
newEntries.stream()
.filter(e -> !previousEntries.contains(e))
.forEach(e -> {
this.topologyManager.register(e);
});
}
private final String name;
private final TopologyManager topologyManager;
}