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// Copyright 2017 Yahoo Holdings. 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.config.application.api.ApplicationMetaData;
import com.yahoo.config.application.api.ApplicationPackage;
import com.yahoo.config.provision.AllocatedHosts;
import com.yahoo.config.provision.TenantName;
import com.yahoo.lang.SettableOptional;
import com.yahoo.transaction.Transaction;
import com.yahoo.vespa.config.server.GlobalComponentRegistry;
import com.yahoo.vespa.config.server.ReloadHandler;
import com.yahoo.vespa.config.server.application.ApplicationSet;
import com.yahoo.vespa.config.server.modelfactory.ActivatedModelsBuilder;
import com.yahoo.vespa.curator.Curator;
import org.apache.zookeeper.KeeperException;
import java.time.Clock;
import java.util.Optional;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A RemoteSession represents a session created on another config server. This session can
* be regarded as read only, and this interface only allows reading information about a session.
*
* @author Ulf Lilleengen
*/
public class RemoteSession extends Session {
private static final Logger log = Logger.getLogger(RemoteSession.class.getName());
private ApplicationSet applicationSet = null;
private final ActivatedModelsBuilder applicationLoader;
private final Clock clock;
/**
* Creates a session. This involves loading the application, validating it and distributing it.
*
* @param tenant The name of the tenant creating session
* @param sessionId The session id for this session.
* @param componentRegistry a registry of global components
* @param zooKeeperClient a SessionZooKeeperClient instance
*/
public RemoteSession(TenantName tenant,
long sessionId,
GlobalComponentRegistry componentRegistry,
SessionZooKeeperClient zooKeeperClient) {
super(tenant, sessionId, zooKeeperClient);
this.applicationLoader = new ActivatedModelsBuilder(tenant, sessionId, zooKeeperClient, componentRegistry);
this.clock = componentRegistry.getClock();
}
void loadPrepared() {
Curator.CompletionWaiter waiter = sessionZooKeeperClient.getPrepareWaiter();
ensureApplicationLoaded();
notifyCompletion(waiter);
}
private ApplicationSet loadApplication() {
ApplicationPackage applicationPackage = sessionZooKeeperClient.loadApplicationPackage();
// Read hosts allocated on the config server instance which created this
Optional<AllocatedHosts> allocatedHosts = applicationPackage.getAllocatedHosts();
return ApplicationSet.fromList(applicationLoader.buildModels(sessionZooKeeperClient.readApplicationId(),
sessionZooKeeperClient.readDockerImageRepository(),
sessionZooKeeperClient.readVespaVersion(),
applicationPackage,
new SettableOptional<>(allocatedHosts),
clock.instant()));
}
public synchronized ApplicationSet ensureApplicationLoaded() {
return applicationSet == null ? applicationSet = loadApplication() : applicationSet;
}
public synchronized void deactivate() {
applicationSet = null;
}
public Transaction createDeleteTransaction() {
return sessionZooKeeperClient.createWriteStatusTransaction(Status.DELETE);
}
void makeActive(ReloadHandler reloadHandler) {
Curator.CompletionWaiter waiter = sessionZooKeeperClient.getActiveWaiter();
log.log(Level.FINE, () -> logPre() + "Getting session from repo: " + getSessionId());
ApplicationSet app = ensureApplicationLoaded();
log.log(Level.FINE, () -> logPre() + "Reloading config for " + getSessionId());
reloadHandler.reloadConfig(app);
log.log(Level.FINE, () -> logPre() + "Notifying " + waiter);
notifyCompletion(waiter);
log.log(Level.INFO, logPre() + "Session activated: " + getSessionId());
}
void confirmUpload() {
Curator.CompletionWaiter waiter = sessionZooKeeperClient.getUploadWaiter();
log.log(Level.FINE, "Notifying upload waiter for session " + getSessionId());
notifyCompletion(waiter);
log.log(Level.FINE, "Done notifying upload for session " + getSessionId());
}
private void notifyCompletion(Curator.CompletionWaiter completionWaiter) {
try {
completionWaiter.notifyCompletion();
} catch (RuntimeException e) {
// Throw only if we get something else than NoNodeException -- NoNodeException might happen when
// the session is no longer in use (e.g. the app using this session has been deleted) and this method
// has not been called yet for the previous session operation
// on a minority of the config servers (see awaitInternal() method in this class)
if (e.getCause().getClass() != KeeperException.NoNodeException.class) {
throw e;
} else {
log.log(Level.INFO, "Not able to notify completion for session: " + getSessionId() + ", node has been deleted");
}
}
}
public void delete() {
Transaction transaction = sessionZooKeeperClient.deleteTransaction();
transaction.commit();
transaction.close();
}
public ApplicationMetaData getMetaData() {
return sessionZooKeeperClient.loadApplicationPackage().getMetaData();
}
}
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