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PolicyCacheLoader.java
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PolicyCacheLoader.java
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/*
* Copyright (c) 2022 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.policies.enforcement;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.base.model.signals.commands.Command;
import org.eclipse.ditto.internal.utils.cache.entry.Entry;
import org.eclipse.ditto.internal.utils.cacheloaders.ActorAskCacheLoader;
import org.eclipse.ditto.internal.utils.cacheloaders.config.AskWithRetryConfig;
import org.eclipse.ditto.internal.utils.cluster.ShardRegionProxyActorFactory;
import org.eclipse.ditto.internal.utils.cluster.config.ClusterConfig;
import org.eclipse.ditto.internal.utils.cluster.config.DefaultClusterConfig;
import org.eclipse.ditto.internal.utils.config.DefaultScopedConfig;
import org.eclipse.ditto.policies.api.PoliciesMessagingConstants;
import org.eclipse.ditto.policies.api.commands.sudo.SudoRetrievePolicyResponse;
import org.eclipse.ditto.policies.enforcement.config.DefaultEnforcementConfig;
import org.eclipse.ditto.policies.model.Policy;
import org.eclipse.ditto.policies.model.PolicyConstants;
import org.eclipse.ditto.policies.model.PolicyId;
import org.eclipse.ditto.policies.model.PolicyRevision;
import org.eclipse.ditto.policies.model.signals.commands.exceptions.PolicyNotAccessibleException;
import com.github.benmanes.caffeine.cache.AsyncCacheLoader;
import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.actor.Scheduler;
/**
* Loads a policy by asking the policies shard-region-proxy.
*/
@Immutable
public final class PolicyCacheLoader implements AsyncCacheLoader<PolicyId, Entry<Policy>> {
private final ActorAskCacheLoader<Policy, Command<?>, PolicyId> delegate;
/**
* Constructor.
*
* @param askWithRetryConfig the configuration for the "ask with retry" pattern applied for the cache loader.
* @param scheduler the scheduler to use for the "ask with retry" for retries.
* @param policiesShardRegionProxy the shard-region-proxy.
*/
public PolicyCacheLoader(final AskWithRetryConfig askWithRetryConfig,
final Scheduler scheduler,
final ActorRef policiesShardRegionProxy) {
delegate = ActorAskCacheLoader.forShard(askWithRetryConfig,
scheduler,
PolicyConstants.ENTITY_TYPE,
policiesShardRegionProxy,
PolicyCommandFactory::sudoRetrievePolicy,
PolicyCacheLoader::extractPolicy);
}
public static PolicyCacheLoader of(final ActorSystem actorSystem) {
final DefaultScopedConfig dittoScoped = DefaultScopedConfig.dittoScoped(actorSystem.settings().config());
final AskWithRetryConfig askWithRetryConfig = DefaultEnforcementConfig.of(dittoScoped)
.getAskWithRetryConfig();
final ClusterConfig clusterConfig = DefaultClusterConfig.of(dittoScoped);
final ShardRegionProxyActorFactory shardRegionProxyActorFactory =
ShardRegionProxyActorFactory.newInstance(actorSystem, clusterConfig);
final ActorRef policiesShardRegion = shardRegionProxyActorFactory.getShardRegionProxyActor(
PoliciesMessagingConstants.CLUSTER_ROLE,
PoliciesMessagingConstants.SHARD_REGION
);
return new PolicyCacheLoader(askWithRetryConfig, actorSystem.scheduler(), policiesShardRegion);
}
@Override
public CompletableFuture<Entry<Policy>> asyncLoad(final PolicyId policyId, final Executor executor) {
return delegate.asyncLoad(policyId, executor);
}
private static Entry<Policy> extractPolicy(final Object response) {
if (response instanceof final SudoRetrievePolicyResponse sudoRetrievePolicyResponse) {
final var policy = sudoRetrievePolicyResponse.getPolicy();
final long revision = policy.getRevision().map(PolicyRevision::toLong)
.orElseThrow(() -> new IllegalStateException("Bad SudoRetrievePolicyResponse: no revision"));
return Entry.of(revision, policy);
} else if (response instanceof PolicyNotAccessibleException) {
return Entry.nonexistent();
} else {
throw new IllegalStateException("expect SudoRetrievePolicyResponse, got: " + response);
}
}
}