-
Notifications
You must be signed in to change notification settings - Fork 215
/
PolicyCacheLoader.java
135 lines (114 loc) · 5.87 KB
/
PolicyCacheLoader.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/*
* 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.AbstractExtensionId;
import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.actor.ExtendedActorSystem;
import akka.actor.Extension;
import akka.actor.Scheduler;
/**
* Loads a policy by asking the policies shard-region-proxy.
*/
@Immutable
public final class PolicyCacheLoader implements AsyncCacheLoader<PolicyId, Entry<Policy>>, Extension {
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.
*/
private PolicyCacheLoader(final AskWithRetryConfig askWithRetryConfig,
final Scheduler scheduler,
final ActorRef policiesShardRegionProxy) {
delegate = ActorAskCacheLoader.forShard(askWithRetryConfig,
scheduler,
PolicyConstants.ENTITY_TYPE,
policiesShardRegionProxy,
PolicyCommandFactory::sudoRetrievePolicy,
PolicyCacheLoader::extractPolicy);
}
/**
* @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.
* @return a new instance of {@link PolicyCacheLoader}.
*/
public static PolicyCacheLoader getNewInstance(final AskWithRetryConfig askWithRetryConfig,
final Scheduler scheduler,
final ActorRef policiesShardRegionProxy) {
return new PolicyCacheLoader(askWithRetryConfig, scheduler, policiesShardRegionProxy);
}
/**
* @param actorSystem used to instantiate this class as a singleton via the akka extension mechanism.
* @return the singleton instance of this {@link PolicyCacheLoader}.
*/
public static PolicyCacheLoader getSingletonInstance(final ActorSystem actorSystem) {
return ExtensionId.INSTANCE.get(actorSystem);
}
private static final class ExtensionId extends AbstractExtensionId<PolicyCacheLoader> {
private static final ExtensionId INSTANCE = new ExtensionId();
@Override
public PolicyCacheLoader createExtension(final ExtendedActorSystem system) {
final DefaultScopedConfig dittoScoped = DefaultScopedConfig.dittoScoped(system.settings().config());
final AskWithRetryConfig askWithRetryConfig = DefaultEnforcementConfig.of(dittoScoped)
.getAskWithRetryConfig();
final ClusterConfig clusterConfig = DefaultClusterConfig.of(dittoScoped);
final ShardRegionProxyActorFactory shardRegionProxyActorFactory =
ShardRegionProxyActorFactory.newInstance(system, clusterConfig);
final ActorRef policiesShardRegion = shardRegionProxyActorFactory.getShardRegionProxyActor(
PoliciesMessagingConstants.CLUSTER_ROLE,
PoliciesMessagingConstants.SHARD_REGION
);
return new PolicyCacheLoader(askWithRetryConfig, system.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);
}
}
}