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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.common.endpoints.event.comm.client;
import java.util.Arrays;
import java.util.List;
import lombok.Getter;
import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
import org.onap.policy.common.endpoints.event.comm.TopicEndpoint;
import org.onap.policy.common.endpoints.event.comm.TopicEndpointManager;
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;
/**
* A "bidirectional" topic, which is a pair of topics, one of which is used to publish
* requests and the other to receive responses.
*/
@Getter
public class BidirectionalTopicClient {
private final String sinkTopic;
private final String sourceTopic;
private final TopicSinkClient sinkClient;
private final TopicSource source;
private final CommInfrastructure sinkTopicCommInfrastructure;
private final CommInfrastructure sourceTopicCommInfrastructure;
/**
* Constructs the object.
*
* @param sinkTopic sink topic name
* @param sourceTopic source topic name
* @throws BidirectionalTopicClientException if either topic does not exist
*/
public BidirectionalTopicClient(String sinkTopic, String sourceTopic) throws BidirectionalTopicClientException {
this.sinkTopic = sinkTopic;
this.sourceTopic = sourceTopic;
// init sinkClient
try {
// if the manager is overridden here, then override it in the sink client, too
this.sinkClient = new TopicSinkClient(sinkTopic) {
@Override
protected List<TopicSink> getTopicSinks(String topic) {
return BidirectionalTopicClient.this.getTopicEndpointManager().getTopicSinks(topic);
}
};
} catch (TopicSinkClientException e) {
throw new BidirectionalTopicClientException(e);
}
// init source
List<TopicSource> sources = getTopicEndpointManager().getTopicSources(Arrays.asList(sourceTopic));
if (sources.isEmpty()) {
throw new BidirectionalTopicClientException("no sources for topic: " + sourceTopic);
} else if (sources.size() > 1) {
throw new BidirectionalTopicClientException("too many sources for topic: " + sourceTopic);
}
this.source = sources.get(0);
this.sinkTopicCommInfrastructure = sinkClient.getSink().getTopicCommInfrastructure();
this.sourceTopicCommInfrastructure = source.getTopicCommInfrastructure();
}
public TopicSink getSink() {
return sinkClient.getSink();
}
public boolean send(Object message) {
return sinkClient.send(message);
}
public void register(TopicListener topicListener) {
source.register(topicListener);
}
public boolean offer(String event) {
return source.offer(event);
}
public void unregister(TopicListener topicListener) {
source.unregister(topicListener);
}
// these may be overridden by junit tests
protected TopicEndpoint getTopicEndpointManager() {
return TopicEndpointManager.getManager();
}
}
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