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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2021 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.clamp.controlloop.runtime.supervision;
import java.io.Closeable;
import java.util.Collection;
import java.util.List;
import java.util.TimerTask;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.onap.policy.clamp.controlloop.models.controlloop.concepts.ControlLoop;
import org.onap.policy.clamp.controlloop.models.controlloop.concepts.ControlLoopElement;
import org.onap.policy.clamp.controlloop.models.controlloop.persistence.provider.ControlLoopProvider;
import org.onap.policy.models.base.PfModelException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class is used to scan the control loops in the database and check if they are in the correct state.
*/
public class SupervisionScanner implements Runnable, Closeable {
private static final Logger LOGGER = LoggerFactory.getLogger(SupervisionScanner.class);
private ControlLoopProvider controlLoopProvider;
private ScheduledExecutorService timerPool;
/**
* Constructor for instantiating SupervisionScanner.
*
* @param controlLoopProvider the provider to use to read control loops from the database
* @param interval time interval to perform scans
*/
public SupervisionScanner(final ControlLoopProvider controlLoopProvider, final long interval) {
this.controlLoopProvider = controlLoopProvider;
// Kick off the timer
timerPool = makeTimerPool();
timerPool.scheduleAtFixedRate(this, 0, interval, TimeUnit.SECONDS);
}
@Override
public void run() {
LOGGER.debug("Scanning control loops in the database . . .");
try {
for (ControlLoop controlLoop : controlLoopProvider.getControlLoops(null, null)) {
scanControlLoop(controlLoop);
}
} catch (PfModelException pfme) {
LOGGER.warn("error reading control loops from database", pfme);
}
LOGGER.debug("Control loop scan complete . . .");
}
@Override
public void close() {
timerPool.shutdown();
}
private void scanControlLoop(final ControlLoop controlLoop) throws PfModelException {
LOGGER.debug("scanning control loop {} . . .", controlLoop.getKey().asIdentifier());
if (controlLoop.getState().equals(controlLoop.getOrderedState().asState())) {
LOGGER.debug("control loop {} scanned, OK", controlLoop.getKey().asIdentifier());
return;
}
for (ControlLoopElement element : controlLoop.getElements().values()) {
if (!element.getState().equals(element.getOrderedState().asState())) {
LOGGER.debug("control loop scan: transitioning from state {} to {}", controlLoop.getState(),
controlLoop.getOrderedState());
return;
}
}
LOGGER.debug("control loop scan: transition from state {} to {} completed", controlLoop.getState(),
controlLoop.getOrderedState());
controlLoop.setState(controlLoop.getOrderedState().asState());
controlLoopProvider.updateControlLoop(controlLoop);
}
/**
* Makes a new timer pool.
*
* @return a new timer pool
*/
protected ScheduledExecutorService makeTimerPool() {
return Executors.newScheduledThreadPool(1);
}
}
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