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/*-
* ============LICENSE_START=======================================================
* ActorService
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.controlloop.actorserviceprovider;
import java.util.Iterator;
import java.util.ServiceLoader;
import org.onap.policy.controlloop.actorserviceprovider.spi.Actor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.collect.ImmutableList;
public class ActorService {
private static final Logger logger = LoggerFactory.getLogger(ActorService.class);
private static ActorService service;
// USed to load actors
private ServiceLoader<Actor> loader;
private ActorService() {
loader = ServiceLoader.load(Actor.class);
}
public static synchronized ActorService getInstance() {
if (service == null) {
service = new ActorService();
}
return service;
}
public ImmutableList<Actor> actors() {
Iterator<Actor> iter = loader.iterator();
logger.debug("returning actors");
while (iter.hasNext()) {
if (logger.isDebugEnabled()) {
logger.debug("Got {}", iter.next().actor());
}
}
return ImmutableList.copyOf(loader.iterator());
}
}
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