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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.maintenance;
import com.yahoo.concurrent.maintenance.JobControl;
import com.yahoo.concurrent.maintenance.JobControlState;
import com.yahoo.concurrent.maintenance.JobMetrics;
import com.yahoo.concurrent.maintenance.Maintainer;
import com.yahoo.jdisc.Metric;
import com.yahoo.path.Path;
import com.yahoo.transaction.Mutex;
import com.yahoo.vespa.config.server.ApplicationRepository;
import com.yahoo.vespa.curator.Curator;
import com.yahoo.vespa.flags.FlagSource;
import com.yahoo.vespa.flags.Flags;
import com.yahoo.vespa.flags.ListFlag;
import java.time.Duration;
import java.util.Map;
import java.util.Set;
/**
* A maintainer is some job which runs at a fixed interval to perform some maintenance task in the config server.
*
* @author hmusum
*/
public abstract class ConfigServerMaintainer extends Maintainer {
protected final ApplicationRepository applicationRepository;
ConfigServerMaintainer(ApplicationRepository applicationRepository, Curator curator, FlagSource flagSource,
Duration initialDelay, Duration interval) {
super(null, interval, initialDelay, new JobControl(new JobControlFlags(curator, flagSource)),
jobMetrics(applicationRepository.metric()));
this.applicationRepository = applicationRepository;
}
private static JobMetrics jobMetrics(Metric metric) {
return new JobMetrics((job, consecutiveFailures) -> {
metric.set("maintenance.consecutiveFailures", consecutiveFailures, metric.createContext(Map.of("job", job)));
});
}
private static class JobControlFlags implements JobControlState {
private static final Path root = Path.fromString("/configserver/v1/");
private static final Path lockRoot = root.append("locks");
private final Curator curator;
private final ListFlag<String> inactiveJobsFlag;
public JobControlFlags(Curator curator, FlagSource flagSource) {
this.curator = curator;
this.inactiveJobsFlag = Flags.INACTIVE_MAINTENANCE_JOBS.bindTo(flagSource);
}
@Override
public Set<String> readInactiveJobs() {
return Set.copyOf(inactiveJobsFlag.value());
}
@Override
public Mutex lockMaintenanceJob(String job) {
return curator.lock(lockRoot.append(job), Duration.ofSeconds(1));
}
}
}
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