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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.clustercontroller.core;
import com.yahoo.vdslib.state.ClusterState;
import com.yahoo.vespa.clustercontroller.core.listeners.SlobrokListener;
import com.yahoo.vespa.clustercontroller.core.listeners.NodeListener;
import java.time.Instant;
import java.util.Optional;
public abstract class RemoteClusterControllerTask {
public static class Context {
public ContentCluster cluster;
public ClusterState currentConsolidatedState;
public ClusterStateBundle publishedClusterStateBundle;
public MasterInterface masterInfo;
public NodeListener nodeListener;
public SlobrokListener slobrokListener;
}
private final Object monitor = new Object();
private boolean completed = false;
public abstract void doRemoteFleetControllerTask(Context context);
/**
* If the task should _not_ be considered complete before a cluster state
* version representing the changes made by the task has been ACKed by
* all distributors.
*
* Note that if a task performs a no-op state change (e.g. setting maintenance
* mode on a node already in maintenance mode), the task may be considered complete
* immediately if its effective changes have already been ACKed.
*/
public boolean hasVersionAckDependency() { return false; }
/**
* If true, signals that a task has failed and can be immediately marked as
* complete without waiting for a version ACK. The task implementation has
* the responsibility of communicating any failure to the caller, and ensuring
* that the lack of version waiting does not violate any invariants.
*/
public boolean isFailed() { return false; }
public enum FailureCondition {
LEADERSHIP_LOST,
DEADLINE_EXCEEDED
}
public static class Failure {
private final FailureCondition condition;
private final String message;
private Failure(FailureCondition condition, String message) {
this.condition = condition;
this.message = message;
}
public static Failure of(FailureCondition condition, String message) {
return new Failure(condition, message);
}
public static Failure of(FailureCondition condition) {
return new Failure(condition, "");
}
public FailureCondition getCondition() {
return condition;
}
public String getMessage() {
return message;
}
}
/**
* If the task completion has been deferred due to hasVersionAckDependency(),
* this method will be invoked if a failure occurs before the version has
* been successfully ACKed.
*
* LEADERSHIP_LOST will be the failure condition if the cluster controller
* discovers it has lost leadership in the time between task execution and
* deferred completion time.
*
* DEADLINE_EXCEEDED will be the failure condition if the completion has been
* deferred for more than a configurable amount of time.
*
* This method will also be invoked if the controller is signalled to shut down
* before the dependent cluster version has been published.
*
* The task implementation is responsible for communicating the appropriate
* error semantics to the caller who initially scheduled the task. If additional
* details are available, Failure.getMessage() will return a non-empty string.
*/
public void handleFailure(Failure failure) {}
public Optional<Instant> getDeadline() {
return Optional.empty();
}
public boolean isCompleted() {
synchronized (monitor) {
return completed;
}
}
/** This is called by the fleet controller. */
public void notifyCompleted() {
synchronized (monitor) {
completed = true;
monitor.notifyAll();
}
}
public void waitForCompletion() {
synchronized (monitor) {
while (!completed) {
try{
monitor.wait();
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
}
@Override
public String toString() { return RemoteClusterControllerTask.class.getSimpleName(); }
}
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