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/*-
* ============LICENSE_START=======================================================
* ONAP PAP
* ================================================================================
* Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* Modifications Copyright (C) 2019 Nordix Foundation.
* ================================================================================
* 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.List;
import lombok.Getter;
import org.onap.policy.common.endpoints.event.comm.TopicEndpoint;
import org.onap.policy.common.endpoints.event.comm.TopicSink;
import org.onap.policy.common.utils.coder.Coder;
import org.onap.policy.common.utils.coder.CoderException;
import org.onap.policy.common.utils.coder.StandardCoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Client for sending messages to a Topic using TopicSink.
*/
public class TopicSinkClient {
private static final Logger logger = LoggerFactory.getLogger(TopicSinkClient.class);
/**
* Coder used to encode messages being sent to the topic.
*/
private static final Coder CODER = new StandardCoder();
/**
* Topic to which messages are published.
*/
@Getter
private final String topic;
/**
* Where messages are published.
*/
private final TopicSink sink;
/**
* Constructs the object.
*
* @param topic topic to which messages should be published
* @throws TopicSinkClientException if the topic does not exist
*/
public TopicSinkClient(final String topic) throws TopicSinkClientException {
this.topic = topic;
final List<TopicSink> lst = getTopicSinks(topic);
if (lst.isEmpty()) {
throw new TopicSinkClientException("no sinks for topic: " + topic);
}
this.sink = lst.get(0);
}
/**
* Sends a message to the topic, after encoding the message as json.
*
* @param message message to be encoded and sent
* @return {@code true} if the message was successfully sent/enqueued, {@code false} otherwise
*/
public boolean send(final Object message) {
try {
final String json = CODER.encode(message);
return sink.send(json);
} catch (RuntimeException | CoderException e) {
logger.warn("send to {} failed because of {}", topic, e.getMessage(), e);
return false;
}
}
// the remaining methods are wrappers that can be overridden by junit tests
/**
* Gets the sinks for a given topic.
*
* @param topic the topic of interest
* @return the sinks for the topic
*/
protected List<TopicSink> getTopicSinks(final String topic) {
return TopicEndpoint.manager.getTopicSinks(topic);
}
}
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