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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
*
* 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.
*/
package io.fd.honeycomb.notification.impl;
import static com.google.common.base.Preconditions.checkState;
import com.google.common.collect.Sets;
import io.fd.honeycomb.notification.ManagedNotificationProducer;
import io.fd.honeycomb.notification.NotificationCollector;
import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;
import javax.annotation.Nonnull;
import javax.annotation.concurrent.ThreadSafe;
import org.opendaylight.mdsal.dom.spi.DOMNotificationSubscriptionListener;
import org.opendaylight.mdsal.dom.spi.DOMNotificationSubscriptionListenerRegistry;
import org.opendaylight.yangtools.concepts.ListenerRegistration;
import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.model.api.SchemaPath;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Starts & stops notification producer dependencies on demand.
* Uses {@link DOMNotificationSubscriptionListenerRegistry} to receive subscription change notifications.
*/
@ThreadSafe
public final class NotificationProducerTracker
implements DOMNotificationSubscriptionListener, AutoCloseable {
private static final Logger LOG = LoggerFactory.getLogger(NotificationProducerTracker.class);
private final ListenerRegistration<NotificationProducerTracker> subscriptionListener;
private final NotificationProducerRegistry registry;
private final NotificationCollector collector;
private final Set<ManagedNotificationProducer> alreadyStartedProducers = new HashSet<>();
public NotificationProducerTracker(@Nonnull final NotificationProducerRegistry registry,
@Nonnull final NotificationCollector collector,
@Nonnull final DOMNotificationSubscriptionListenerRegistry notificationRouter) {
this.registry = registry;
this.collector = collector;
this.subscriptionListener = notificationRouter.registerSubscriptionListener(this);
}
@Override
public synchronized void onSubscriptionChanged(final Set<SchemaPath> set) {
LOG.debug("Subscriptions changed. Current subscriptions: {}", set);
final Set<QName> currentSubscriptions = set.stream().map(SchemaPath::getLastComponent).collect(Collectors.toSet());
final Set<QName> startedQNames = getStartedQNames(alreadyStartedProducers);
final Sets.SetView<QName> newSubscriptions = Sets.difference(currentSubscriptions, startedQNames);
LOG.debug("Subscriptions changed. New subscriptions: {}", newSubscriptions);
final Sets.SetView<QName> deletedSubscriptions = Sets.difference(startedQNames, currentSubscriptions);
LOG.debug("Subscriptions changed. Deleted subscriptions: {}", deletedSubscriptions);
newSubscriptions.stream().forEach(newSub -> {
if(!registry.getNotificationQNameToProducer().containsKey(newSub)) {
return;
}
final ManagedNotificationProducer producer = registry.getNotificationQNameToProducer().get(newSub);
if(alreadyStartedProducers.contains(producer)) {
return;
}
LOG.debug("Starting notification producer: {}", producer);
producer.start(collector);
alreadyStartedProducers.add(producer);
});
deletedSubscriptions.stream().forEach(newSub -> {
checkState(registry.getNotificationQNameToProducer().containsKey(newSub));
final ManagedNotificationProducer producer = registry.getNotificationQNameToProducer().get(newSub);
checkState(alreadyStartedProducers.contains(producer));
LOG.debug("Stopping notification producer: {}", producer);
producer.stop();
alreadyStartedProducers.remove(producer);
});
}
private Set<QName> getStartedQNames(final Set<ManagedNotificationProducer> alreadyStartedProducers) {
return alreadyStartedProducers.stream()
.flatMap(p -> registry.getNotificationProducerQNames().get(p).stream())
.collect(Collectors.toSet());
}
@Override
public synchronized void close() throws Exception {
LOG.trace("Closing");
subscriptionListener.close();
// Stop all producers
LOG.debug("Stopping all producers: {}", alreadyStartedProducers);
alreadyStartedProducers.forEach(ManagedNotificationProducer::stop);
alreadyStartedProducers.clear();
}
}
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