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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.container.handler;
import com.google.inject.Inject;
import com.yahoo.component.AbstractComponent;
import java.util.HashMap;
import java.util.Map;
/**
* A component which tracks the up/down status of any clusters which should influence
* the up down status of this container itself, as well as the separate fact that such clusters are present.
*
* This is a separate component which has <b>no dependencies</b> such that the status tracked in this
* will survive reconfiguration events and inform other components even immediately after a reconfiguration
* (where the true statue of clusters may not yet be available).
*
* This is multithread safe.
*
* @author bratseth
*/
public class ClustersStatus extends AbstractComponent {
// NO DEPENDENCIES: Do not add dependencies here
@Inject
public ClustersStatus() { }
/** Are there any (in-service influencing) clusters in this container? */
private boolean containerHasClusters;
private final Object mutex = new Object();
/** The status of clusters, when known. Note that clusters may exist for which there is no knowledge yet. */
private final Map<String, Boolean> clusterStatus = new HashMap<>();
public void setContainerHasClusters(boolean containerHasClusters) {
synchronized (mutex) {
this.containerHasClusters = containerHasClusters;
if ( ! containerHasClusters)
clusterStatus.clear(); // forget container clusters which was configured away
}
}
/** @deprecated this is ignored */
@Deprecated // TODO: remove on Vespa 8
public void setReceiveTrafficByDefault(boolean receiveTrafficByDefault) {
}
void setUp(String clusterIdentifier) {
synchronized (mutex) {
clusterStatus.put(clusterIdentifier, Boolean.TRUE);
}
}
void setDown(String clusterIdentifier) {
synchronized (mutex) {
clusterStatus.put(clusterIdentifier, Boolean.FALSE);
}
}
/** @deprecated use setUp(String) instead */
@Deprecated // TODO: Remove on Vespa 8
public void setUp(Object clusterIdentifier) {
setUp((String) clusterIdentifier);
}
/** @deprecated use setDown(String) instead */
@Deprecated // TODO: Remove on Vespa 8
public void setDown(Object clusterIdentifier) {
setDown((String) clusterIdentifier);
}
/** Returns whether this container should receive traffic based on the state of this */
public boolean containerShouldReceiveTraffic() {
synchronized (mutex) {
if (containerHasClusters) {
// Should receive traffic when at least one cluster is up
return clusterStatus.values().stream().anyMatch(status -> status==true);
}
else {
return true;
}
}
}
}
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