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InfinispanMultiSiteLoadBalancerCheckProvider.java
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InfinispanMultiSiteLoadBalancerCheckProvider.java
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/*
* Copyright 2023 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.keycloak.connections.infinispan;
import org.infinispan.Cache;
import org.infinispan.factories.ComponentRegistry;
import org.infinispan.persistence.manager.PersistenceManager;
import org.jboss.logging.Logger;
import org.keycloak.health.LoadBalancerCheckProvider;
import java.util.Objects;
import static org.keycloak.connections.infinispan.InfinispanConnectionProvider.ALL_CACHES_NAME;
public class InfinispanMultiSiteLoadBalancerCheckProvider implements LoadBalancerCheckProvider {
private static final Logger LOG = Logger.getLogger(InfinispanMultiSiteLoadBalancerCheckProvider.class);
private final InfinispanConnectionProvider connectionProvider;
public InfinispanMultiSiteLoadBalancerCheckProvider(InfinispanConnectionProvider connectionProvider) {
Objects.requireNonNull(connectionProvider, "connectionProvider");
this.connectionProvider = connectionProvider;
}
/**
* Non-blocking check if all caches and their persistence are available.
* <p />
* In a situation where any cache's remote cache is unreachable, this will report the "down" to the caller.
* When the remote cache is down, it assumes that it is down for all Keycloak nodes in this site, all incoming
* requests are likely to fail and that a loadbalancer should send traffic to the other site that might be healthy.
* <p />
* This code is non-blocking as the embedded Infinispan checks the connection to the remote store periodically
* in the background (default: every second).
* See {@link LoadBalancerCheckProvider#isDown()} to read more why this needs to be non-blocking.
*
* @return true if the component is down/unhealthy, false otherwise
*/
@Override
public boolean isDown() {
for (String cacheName : ALL_CACHES_NAME) {
// do not block in cache creation, as this method is required to be non-blocking
Cache<?,?> cache = connectionProvider.getCache(cacheName, false);
// check if cache is started
if (cache == null || !cache.getStatus().allowInvocations()) {
LOG.debugf("Cache '%s' is not started yet.", cacheName);
return true; // no need to check other caches
}
var persistenceManager = ComponentRegistry.componentOf(cache, PersistenceManager.class);
if (persistenceManager != null && !persistenceManager.isAvailable()) {
LOG.debugf("PersistenceManager for cache '%s' is down.", cacheName);
return true; // no need to check other caches
}
LOG.debugf("Cache '%s' is up.", cacheName);
}
return false;
}
@Override
public void close() {
}
}