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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.hosted.provision.provisioning;
import com.yahoo.lang.CachedSupplier;
import com.yahoo.vespa.hosted.provision.persistence.CuratorDb;
import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.util.Optional;
/**
* Keeps cached data about when to do a firmware check on the hosts managed by a node repository.
*
* The data kept here is managed through POST and DELETE to <code>/nodes/v2/upgrade/firmware</code>
* <p>
* Reads and writes are not locked, as writes do not depend on prior state.
* <p>
* Local cache expires periodically, and on writes from this host, for testing.
*
* @author jonmv
*/
public class FirmwareChecks {
private static final Duration cacheExpiry = Duration.ofMinutes(1);
private final CuratorDb database;
private final Clock clock;
private final CachedSupplier<Optional<Instant>> checkAfter;
public FirmwareChecks(CuratorDb database, Clock clock) {
this.database = database;
this.clock = clock;
this.checkAfter = new CachedSupplier<>(database::readFirmwareCheck, cacheExpiry);
}
/** Returns the instant after which a firmware check is required, or empty if none currently are. */
public Optional<Instant> requiredAfter() {
return checkAfter.get();
}
/** Requests a firmware check for all hosts managed by this node repository. */
public void request() {
database.writeFirmwareCheck(Optional.of(clock.instant()));
checkAfter.invalidate();
}
/** Clears any outstanding firmware checks for this node repository. */
public void cancel() {
database.writeFirmwareCheck(Optional.empty());
checkAfter.invalidate();
}
}
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