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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.session;
import com.yahoo.text.Utf8;
import com.yahoo.vespa.config.server.monitoring.MetricUpdater;
import com.yahoo.vespa.curator.Curator;
import org.apache.curator.framework.recipes.cache.ChildData;
import java.util.concurrent.Executor;
import java.util.logging.Level;
import java.util.logging.Logger;
import static com.yahoo.vespa.config.server.session.Session.Status;
/**
* Watches one particular session (/config/v2/tenants/<tenantName>/sessions/<n>/sessionState in ZooKeeper)
* The session must be in the session repo.
*
* @author Vegard Havdal
* @author hmusum
*/
public class SessionStateWatcher {
private static final Logger log = Logger.getLogger(SessionStateWatcher.class.getName());
private final Curator.FileCache fileCache;
private volatile RemoteSession session;
private final MetricUpdater metrics;
private final Executor zkWatcherExecutor;
private final SessionRepository sessionRepository;
SessionStateWatcher(Curator.FileCache fileCache,
RemoteSession session,
MetricUpdater metrics,
Executor zkWatcherExecutor,
SessionRepository sessionRepository) {
this.fileCache = fileCache;
this.session = session;
this.metrics = metrics;
this.fileCache.addListener(this::nodeChanged);
this.fileCache.start();
this.zkWatcherExecutor = zkWatcherExecutor;
this.sessionRepository = sessionRepository;
}
private synchronized void sessionStatusChanged(Status newStatus) {
long sessionId = session.getSessionId();
switch (newStatus) {
case NEW:
case NONE:
break;
case PREPARE:
createLocalSession(sessionId);
sessionRepository.prepareRemoteSession(session);
break;
case ACTIVATE:
createLocalSession(sessionId);
sessionRepository.activate(session);
break;
case DEACTIVATE:
sessionRepository.deactivate(session);
break;
case DELETE:
sessionRepository.delete(session);
break;
default:
throw new IllegalStateException("Unknown status " + newStatus);
}
}
private void createLocalSession(long sessionId) {
sessionRepository.createLocalSessionUsingDistributedApplicationPackage(sessionId);
}
public long getSessionId() {
return session.getSessionId();
}
public void close() {
try {
fileCache.close();
} catch (Exception e) {
log.log(Level.WARNING, "Exception when closing watcher", e);
}
}
private void nodeChanged() {
zkWatcherExecutor.execute(() -> {
Status newStatus = Status.NONE;
try {
ChildData node = fileCache.getCurrentData();
if (node != null) {
newStatus = Status.parse(Utf8.toString(node.getData()));
log.log(Level.FINE, session.logPre() + "Session change: Session "
+ session.getSessionId() + " changed status to " + newStatus.name());
sessionStatusChanged(newStatus);
}
} catch (Exception e) {
log.log(Level.WARNING, session.logPre() + "Error handling session change to " +
newStatus.name() + " for session " + getSessionId(), e);
metrics.incSessionChangeErrors();
}
});
}
public synchronized void updateRemoteSession(RemoteSession session) {
this.session = session;
}
}
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