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/*-
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2020 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.simulators;
import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
import org.onap.policy.common.endpoints.event.comm.TopicListener;
import org.onap.policy.common.endpoints.event.comm.TopicSink;
import org.onap.policy.common.endpoints.event.comm.TopicSource;
import org.onap.policy.common.utils.coder.Coder;
import org.onap.policy.common.utils.coder.CoderException;
/**
* Server whose requests are received from a topic, and whose responses are sent to a
* topic.
*/
public abstract class TopicServer<Q> implements TopicListener {
private final TopicSink sink;
private final TopicSource source;
private final Coder coder;
private final Class<Q> reqClass;
/**
* Constructs the object.
*
* @param sink sink to which responses should be published
* @param source source from which requests arrive
*/
public TopicServer(TopicSink sink, TopicSource source, Coder coder, Class<Q> reqClass) {
this.sink = sink;
this.source = source;
this.coder = coder;
this.reqClass = reqClass;
source.register(this);
}
public void shutdown() {
source.unregister(this);
}
@Override
public void onTopicEvent(CommInfrastructure commType, String topic, String request) {
Q req;
try {
req = coder.decode(request, reqClass);
} catch (CoderException e) {
throw new IllegalArgumentException("cannot decode request from " + source.getTopic());
}
sink.send(process(req));
}
protected abstract String process(Q request);
}
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