/
ModifyPolicyStrategy.java
106 lines (92 loc) · 4.83 KB
/
ModifyPolicyStrategy.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
/*
* Copyright (c) 2019 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.services.policies.persistence.actors.strategies.commands;
import java.time.Instant;
import java.util.Optional;
import java.util.Set;
import javax.annotation.Nullable;
import org.eclipse.ditto.json.JsonObject;
import org.eclipse.ditto.model.base.entity.metadata.Metadata;
import org.eclipse.ditto.model.base.headers.DittoHeaders;
import org.eclipse.ditto.model.base.headers.WithDittoHeaders;
import org.eclipse.ditto.model.base.headers.entitytag.EntityTag;
import org.eclipse.ditto.model.policies.PoliciesModelFactory;
import org.eclipse.ditto.model.policies.Policy;
import org.eclipse.ditto.model.policies.PolicyEntry;
import org.eclipse.ditto.model.policies.PolicyId;
import org.eclipse.ditto.model.policies.PolicyTooLargeException;
import org.eclipse.ditto.services.models.policies.PoliciesValidator;
import org.eclipse.ditto.services.policies.common.config.PolicyConfig;
import org.eclipse.ditto.services.utils.persistentactors.results.Result;
import org.eclipse.ditto.services.utils.persistentactors.results.ResultFactory;
import org.eclipse.ditto.signals.commands.policies.PolicyCommandSizeValidator;
import org.eclipse.ditto.signals.commands.policies.modify.ModifyPolicy;
import org.eclipse.ditto.signals.commands.policies.modify.ModifyPolicyResponse;
import org.eclipse.ditto.signals.events.policies.PolicyEvent;
import org.eclipse.ditto.signals.events.policies.PolicyModified;
/**
* This strategy handles the {@link org.eclipse.ditto.signals.commands.policies.modify.ModifyPolicy} command for an
* already existing Policy.
*/
final class ModifyPolicyStrategy extends AbstractPolicyCommandStrategy<ModifyPolicy> {
ModifyPolicyStrategy(final PolicyConfig policyConfig) {
super(ModifyPolicy.class, policyConfig);
}
@Override
protected Result<PolicyEvent> doApply(final Context<PolicyId> context,
@Nullable final Policy entity,
final long nextRevision,
final ModifyPolicy command,
@Nullable final Metadata metadata) {
final Instant eventTs = getEventTimestamp();
final Set<PolicyEntry> adjustedEntries = potentiallyAdjustPolicyEntries(command.getPolicy().getEntriesSet());
final Policy adjustedPolicy = PoliciesModelFactory.newPolicyBuilder(
command.getPolicy().getEntityId().orElseThrow(), adjustedEntries).build();
final DittoHeaders dittoHeaders = command.getDittoHeaders();
final ModifyPolicy adjustedCommand = ModifyPolicy.of(command.getEntityId(), adjustedPolicy, dittoHeaders);
final Policy modifiedPolicyWithImplicits = adjustedPolicy.toBuilder()
.setModified(eventTs)
.setRevision(nextRevision)
.build();
final JsonObject modifiedPolicyJsonObject = modifiedPolicyWithImplicits.toJson();
try {
PolicyCommandSizeValidator.getInstance()
.ensureValidSize(
modifiedPolicyJsonObject::getUpperBoundForStringSize,
() -> modifiedPolicyJsonObject.toString().length(),
adjustedCommand::getDittoHeaders);
} catch (final PolicyTooLargeException e) {
return ResultFactory.newErrorResult(e, adjustedCommand);
}
final PoliciesValidator validator = PoliciesValidator.newInstance(modifiedPolicyWithImplicits);
if (validator.isValid()) {
final PolicyModified policyModified =
PolicyModified.of(modifiedPolicyWithImplicits, nextRevision, eventTs, dittoHeaders);
final WithDittoHeaders<?> response = appendETagHeaderIfProvided(adjustedCommand,
ModifyPolicyResponse.modified(context.getState(), dittoHeaders),
modifiedPolicyWithImplicits);
return ResultFactory.newMutationResult(adjustedCommand, policyModified, response);
} else {
return ResultFactory.newErrorResult(
policyInvalid(context.getState(), validator.getReason().orElse(null), dittoHeaders), command);
}
}
@Override
public Optional<EntityTag> previousEntityTag(final ModifyPolicy command, @Nullable final Policy previousEntity) {
return Optional.ofNullable(previousEntity).flatMap(EntityTag::fromEntity);
}
@Override
public Optional<EntityTag> nextEntityTag(final ModifyPolicy command, @Nullable final Policy newEntity) {
return Optional.ofNullable(newEntity).flatMap(EntityTag::fromEntity);
}
}