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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.handler;
import java.util.IdentityHashMap;
import java.util.Map;
import com.google.inject.Inject;
import com.yahoo.container.QrSearchersConfig;
import com.yahoo.container.core.VipStatusConfig;
/**
* API for programmatically removing the container from VIP rotation.
*
* @author Steinar Knutsen
*/
public class VipStatus {
private final Map<Object, Boolean> clusters = new IdentityHashMap<>();
private final VipStatusConfig vipStatusConfig;
public VipStatus() {
this(null, new VipStatusConfig(new VipStatusConfig.Builder()));
}
public VipStatus(QrSearchersConfig dispatchers) {
this(dispatchers, new VipStatusConfig(new VipStatusConfig.Builder()));
}
// TODO: Why use QrSearchersConfig here? Remove and inject ComponentRegistry<ClusterSearcher> instead?
@Inject
public VipStatus(QrSearchersConfig dispatchers, VipStatusConfig vipStatusConfig) {
// the config is not used for anything, it's just a dummy to create a
// dependency link to which dispatchers are used
this.vipStatusConfig = vipStatusConfig;
}
/**
* Set a service or cluster into rotation.
*
* @param clusterIdentifier
* an object where the object identity will serve to identify the
* cluster or service
*/
public void addToRotation(Object clusterIdentifier) {
synchronized (clusters) {
clusters.put(clusterIdentifier, Boolean.TRUE);
}
}
/**
* Set a service or cluster out of rotation.
*
* @param clusterIdentifier
* an object where the object identity will serve to identify the
* cluster or service
*/
public void removeFromRotation(Object clusterIdentifier) {
synchronized (clusters) {
clusters.put(clusterIdentifier, Boolean.FALSE);
}
}
/**
* Tell whether the container is connected to any active services at all.
*
* @return true if at least one service or cluster is up, or value is taken from config if no services
* are registered (yet)
*/
public boolean isInRotation() {
synchronized (clusters) {
// if no stored state, use config to decide whether to serve or not
if (clusters.size() == 0) {
return vipStatusConfig.initiallyInRotation();
}
for (Boolean inRotation : clusters.values()) {
if (inRotation) {
return true;
}
}
}
return false;
}
}
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