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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2018, 2020-2021 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.drools.pooling.state;
import lombok.Getter;
import org.onap.policy.drools.pooling.PoolingManager;
import org.onap.policy.drools.pooling.message.Heartbeat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The start state. Upon entry, a heart beat is generated and the event filter is changed
* to look for just that particular message. Once the message is seen, it goes into the
* {@link QueryState}.
*/
@Getter
public class StartState extends State {
private static final Logger logger = LoggerFactory.getLogger(StartState.class);
/**
* Time stamp inserted into the heart beat message.
*/
private long hbTimestampMs = System.currentTimeMillis();
/**
* Constructor.
*
* @param mgr pooling manager
*/
public StartState(PoolingManager mgr) {
super(mgr);
}
@Override
public void start() {
super.start();
var hb = makeHeartbeat(hbTimestampMs);
publish(getHost(), hb);
/*
* heart beat generator
*/
long genMs = getProperties().getInterHeartbeatMs();
scheduleWithFixedDelay(genMs, genMs, () -> {
publish(getHost(), hb);
return null;
});
/*
* my heart beat checker
*/
schedule(getProperties().getStartHeartbeatMs(), () -> {
logger.error("missed heartbeat on topic {}", getTopic());
return internalTopicFailed();
});
}
/**
* Transitions to the query state if the heart beat originated from this host and its
* time stamp matches.
*/
@Override
public State process(Heartbeat msg) {
if (msg.getTimestampMs() == hbTimestampMs && getHost().equals(msg.getSource())) {
// saw our own heart beat - transition to query state
logger.info("saw our own heartbeat on topic {}", getTopic());
publish(makeQuery());
return goQuery();
} else {
logger.info("ignored old heartbeat message from {} on topic {}", msg.getSource(), getTopic());
}
return null;
}
}
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