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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.container.handler;
import com.yahoo.component.annotation.Inject;
import com.yahoo.component.AbstractComponent;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
/**
* 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 (from config)
* that such clusters are present. This is a separate fact because we might know we have clusters configured,
* but we don't have positive information that they are up yet, and in this case we should be down.
*
* 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() { }
public enum Require {ONE, ALL}
/** 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<>();
/** Sets the current clusters of this container */
public void setClusters(Set<String> clusters) {
synchronized (mutex) {
this.containerHasClusters = clusters.size() > 0;
for (Iterator<String> i = clusterStatus.keySet().iterator(); i.hasNext(); ) {
String existingCluster = i.next();
if ( ! clusters.contains(existingCluster))
i.remove(); // forget clusters which was configured away
}
}
}
void setUp(String clusterIdentifier) {
synchronized (mutex) {
clusterStatus.put(clusterIdentifier, Boolean.TRUE);
}
}
void setDown(String clusterIdentifier) {
synchronized (mutex) {
clusterStatus.put(clusterIdentifier, Boolean.FALSE);
}
}
/**
* Returns whether this container should receive traffic based on the state of this
*
* @param require requirement for being up, ALL or ONE.
*/
public boolean containerShouldReceiveTraffic(Require require) {
synchronized (mutex) {
if (containerHasClusters) {
switch (require) {
case ONE:
// Should receive traffic when at least one cluster is up
return clusterStatus.values().stream().anyMatch(status -> status == true);
case ALL:
default:
return !clusterStatus.isEmpty() && clusterStatus.values().stream().allMatch(status -> status == true);
}
}
else {
return true;
}
}
}
}
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