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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2018 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 static org.onap.policy.drools.pooling.state.FilterUtils.MSG_CHANNEL;
import static org.onap.policy.drools.pooling.state.FilterUtils.MSG_TIMESTAMP;
import static org.onap.policy.drools.pooling.state.FilterUtils.makeAnd;
import static org.onap.policy.drools.pooling.state.FilterUtils.makeEquals;
import static org.onap.policy.drools.pooling.state.FilterUtils.makeOr;
import java.util.Map;
import org.onap.policy.drools.pooling.PoolingManager;
import org.onap.policy.drools.pooling.message.Heartbeat;
import org.onap.policy.drools.pooling.message.Identification;
import org.onap.policy.drools.pooling.message.Leader;
import org.onap.policy.drools.pooling.message.Message;
import org.onap.policy.drools.pooling.message.Offline;
import org.onap.policy.drools.pooling.message.Query;
/**
* 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}.
*/
public class StartState extends State {
/**
* Time stamp inserted into the heart beat message.
*/
private long hbTimestampMs = System.currentTimeMillis();
/**
*
* @param mgr
*/
public StartState(PoolingManager mgr) {
super(mgr);
}
/**
*
* @return the time stamp inserted into the heart beat message
*/
public long getHbTimestampMs() {
return hbTimestampMs;
}
@Override
public void start() {
super.start();
publish(getHost(), makeHeartbeat(hbTimestampMs));
schedule(getProperties().getStartHeartbeatMs(), xxx -> 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
publish(makeQuery());
return goQuery();
}
return null;
}
/**
* Discards the message.
*/
@Override
public State process(Identification msg) {
return null;
}
/**
* Processes the assignments, but remains in the current state.
*/
@Override
public State process(Leader msg) {
super.process(msg);
return null;
}
/**
* Discards the message.
*/
@Override
public State process(Offline msg) {
return null;
}
/**
* Discards the message.
*/
@Override
public State process(Query msg) {
return null;
}
@SuppressWarnings("unchecked")
@Override
public Map<String, Object> getFilter() {
// ignore everything except our most recent heart beat message
return makeOr(makeEquals(MSG_CHANNEL, Message.ADMIN), makeAnd(makeEquals(MSG_CHANNEL, getHost()),
makeEquals(MSG_TIMESTAMP, String.valueOf(hbTimestampMs))));
}
}
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