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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.controller.maintenance;
import com.yahoo.vespa.hosted.controller.Controller;
import com.yahoo.vespa.hosted.controller.api.integration.dns.NameService;
import com.yahoo.vespa.hosted.controller.dns.NameServiceQueue;
import com.yahoo.vespa.hosted.controller.persistence.CuratorDb;
import java.time.Clock;
import java.time.Duration;
import java.util.logging.Level;
/**
* This dispatches requests from {@link NameServiceQueue} to a {@link NameService}. Successfully dispatched requests are
* removed from the queue.
*
* @author mpolden
*/
public class NameServiceDispatcher extends ControllerMaintainer {
private final Clock clock;
private final CuratorDb db;
private final NameService nameService;
public NameServiceDispatcher(Controller controller, Duration interval) {
super(controller, interval);
this.clock = controller.clock();
this.db = controller.curator();
this.nameService = controller.serviceRegistry().nameService();
}
@Override
protected double maintain() {
// Dispatch 1 request per second on average. Note that this is not entirely accurate because a NameService
// implementation may need to perform multiple API-specific requests to execute a single NameServiceRequest
int requestCount = trueIntervalInSeconds();
try (var lock = db.lockNameServiceQueue()) {
var queue = db.readNameServiceQueue();
var instant = clock.instant();
var remaining = queue.dispatchTo(nameService, requestCount);
if (queue == remaining) return 1.0; // Queue unchanged
var dispatched = queue.first(requestCount);
if (!dispatched.requests().isEmpty()) {
Level logLevel = controller().system().isCd() ? Level.INFO : Level.FINE;
log.log(logLevel, "Dispatched name service request(s) in " +
Duration.between(instant, clock.instant()) +
": " + dispatched.requests());
}
db.writeNameServiceQueue(remaining);
}
return 1.0;
}
/** The true interval at which this runs in this cluster */
private int trueIntervalInSeconds() {
return (int) interval().dividedBy(db.cluster().size()).getSeconds();
}
}
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