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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2019, 2021 AT&T Intellectual Property. All rights reserved.
* Modifications Copyright (C) 2020 Bell Canada. 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.listeners;
import lombok.AccessLevel;
import lombok.NoArgsConstructor;
import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
import org.onap.policy.common.endpoints.event.comm.TopicListener;
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.onap.policy.common.utils.coder.StandardCoderObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Listens for messages received on a topic, in JSON format, decodes them into a
* {@link StandardCoderObject}, and then offers the objects to the subclass.
*/
@NoArgsConstructor(access = AccessLevel.PROTECTED)
public abstract class JsonListener implements TopicListener {
private static final Logger logger = LoggerFactory.getLogger(JsonListener.class);
/**
* Used to decode the event.
*/
private static final Coder coder = new StandardCoder();
@Override
public void onTopicEvent(CommInfrastructure infra, String topic, String event) {
// decode from JSON into a standard object
StandardCoderObject sco;
try {
sco = coder.decode(event, StandardCoderObject.class);
} catch (CoderException e) {
logger.warn("unable to decode: {}", event, e);
return;
}
onTopicEvent(infra, topic, sco);
}
/**
* Indicates that a standard object was received.
*
* @param infra infrastructure with which the message was received
* @param topic topic on which the message was received
* @param sco the standard object that was received
*/
public abstract void onTopicEvent(CommInfrastructure infra, String topic, StandardCoderObject sco);
}
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