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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.application;
import com.yahoo.component.Version;
import com.yahoo.config.model.api.HostInfo;
import com.yahoo.config.provision.ApplicationId;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Optional;
/**
* Immutable set of {@link Application}s with the same {@link ApplicationId}, applications have difference vespa versions.
*
* @author vegard
*/
public final class ApplicationVersions {
private final Version latestVersion;
private final ApplicationId applicationId;
private final long generation;
private final HashMap<Version, Application> applications = new HashMap<>();
private ApplicationVersions(List<Application> applications) {
if (applications.isEmpty()) throw new IllegalArgumentException("application list cannot be empty");
Application firstApp = applications.get(0);
applicationId = firstApp.getId();
generation = firstApp.getApplicationGeneration();
for (Application application : applications) {
this.applications.put(application.getVespaVersion(), application);
ApplicationId applicationId = application.getId();
if ( ! applicationId.equals(this.applicationId)) {
throw new IllegalArgumentException("Trying to create set with different application ids (" +
application + " and " + this.applicationId + ")");
}
if ( ! application.getApplicationGeneration().equals(generation)) {
throw new IllegalArgumentException("Trying to create set with different generations (" +
generation + " and " + this.generation + ")");
}
}
latestVersion = this.applications.keySet().stream().max(Version::compareTo).get();
}
public static ApplicationVersions fromList(List<Application> applications) {
return new ApplicationVersions(applications);
}
// For testing
public static ApplicationVersions from(Application application) {
return fromList(List.of(application));
}
/**
* Returns an application for the specified version, or the latest if not specified, or if the given version is not
* available and the latest is a permissible substitution.
*
* @throws VersionDoesNotExistException if the specified version is not available and the latest version is not
* a permissible substitution
*/
public Application getForVersionOrLatest(Optional<Version> optionalVersion, Instant now) {
Version version = optionalVersion.orElse(latestVersion);
return resolveForVersion(version, now)
.orElseThrow(() -> new VersionDoesNotExistException(applicationId + " has no model for Vespa version " + version));
}
private Optional<Application> resolveForVersion(Version vespaVersion, Instant now) {
Application application = applications.get(vespaVersion);
if (application != null)
return Optional.of(application);
// Does the latest version specify we can use it regardless?
Application latest = applications.get(latestVersion);
if (latest.getModel().allowModelVersionMismatch(now))
return Optional.of(latest);
return Optional.empty();
}
/** Returns the application for the given version, or empty if not found */
public Optional<Application> get(Version version) {
return Optional.ofNullable(applications.get(version));
}
public ApplicationId getId() { return applicationId; }
public Collection<String> allHosts() {
return applications.values().stream()
.flatMap(app -> app.getModel().getHosts().stream()
.map(HostInfo::getHostname))
.toList();
}
public void updateHostMetrics() {
applications.values().forEach(app -> app.updateHostMetrics(app.getModel().getHosts().size()));
}
public long applicationGeneration() {
return generation;
}
List<Application> applications() {
return new ArrayList<>(applications.values());
}
public List<Version> versions(ApplicationId applicationId) {
return applications.values().stream()
.filter(application -> application.getId().equals(applicationId))
.map(Application::getVespaVersion)
.sorted()
.toList();
}
}
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