-
Notifications
You must be signed in to change notification settings - Fork 214
/
SubjectExpiryActor.java
602 lines (509 loc) · 25.4 KB
/
SubjectExpiryActor.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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
/*
* Copyright (c) 2021 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.service.persistence.actors.announcements;
import static org.eclipse.ditto.policies.service.persistence.actors.announcements.SubjectExpiryState.DELETED;
import static org.eclipse.ditto.policies.service.persistence.actors.announcements.SubjectExpiryState.TO_ACKNOWLEDGE;
import static org.eclipse.ditto.policies.service.persistence.actors.announcements.SubjectExpiryState.TO_ANNOUNCE;
import static org.eclipse.ditto.policies.service.persistence.actors.announcements.SubjectExpiryState.TO_DELETE;
import java.time.Duration;
import java.time.Instant;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.ThreadLocalRandom;
import org.eclipse.ditto.base.model.common.DittoDuration;
import org.eclipse.ditto.base.model.common.HttpStatus;
import org.eclipse.ditto.base.model.exceptions.DittoRuntimeException;
import org.eclipse.ditto.base.model.headers.DittoHeaderDefinition;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.eclipse.ditto.base.model.headers.DittoHeadersBuilder;
import org.eclipse.ditto.base.model.signals.Signal;
import org.eclipse.ditto.base.model.signals.acks.Acknowledgement;
import org.eclipse.ditto.base.model.signals.acks.Acknowledgements;
import org.eclipse.ditto.internal.utils.pekko.logging.DittoDiagnosticLoggingAdapter;
import org.eclipse.ditto.internal.utils.pekko.logging.DittoLoggerFactory;
import org.eclipse.ditto.internal.utils.pubsub.DistributedPub;
import org.eclipse.ditto.internal.utils.pubsub.extractors.AckExtractor;
import org.eclipse.ditto.policies.model.PolicyId;
import org.eclipse.ditto.policies.model.Subject;
import org.eclipse.ditto.policies.model.SubjectAnnouncement;
import org.eclipse.ditto.policies.model.SubjectExpiry;
import org.eclipse.ditto.policies.model.signals.announcements.PolicyAnnouncement;
import org.eclipse.ditto.policies.model.signals.announcements.SubjectDeletionAnnouncement;
import org.eclipse.ditto.policies.service.common.config.PolicyAnnouncementConfig;
import org.eclipse.ditto.policies.service.persistence.actors.strategies.commands.SudoDeleteExpiredSubject;
import org.apache.pekko.NotUsed;
import org.apache.pekko.actor.AbstractFSM;
import org.apache.pekko.actor.ActorRef;
import org.apache.pekko.actor.Address;
import org.apache.pekko.actor.Props;
import org.apache.pekko.cluster.Cluster;
import org.apache.pekko.japi.pf.FSMStateFunctionBuilder;
import scala.util.Random$;
/**
* Actor to track subject deletion announcements for 1 expiring or deleted subject.
*/
public final class SubjectExpiryActor extends AbstractFSM<SubjectExpiryState, NotUsed> {
private static final AckExtractor<PolicyAnnouncement<?>> ACK_EXTRACTOR =
AckExtractor.of(PolicyAnnouncement::getEntityId, PolicyAnnouncement::getDittoHeaders);
/**
* Compensation for timer inaccuracy and scheduling delay.
*/
private static final Duration ANNOUNCEMENT_WINDOW = Duration.ofMillis(500);
private static final NotUsed NULL = NotUsed.getInstance();
private final DittoDiagnosticLoggingAdapter log = DittoLoggerFactory.getDiagnosticLoggingAdapter(this);
private final PolicyId policyId;
private final Subject subject;
private final Duration gracePeriod;
private final DistributedPub<PolicyAnnouncement<?>> policyAnnouncementPub;
private final SudoDeleteExpiredSubject sudoDeleteExpiredSubject;
private final Duration persistenceTimeout;
private final ActorRef commandForwarder;
private final boolean enableAnnouncementsWhenDeleted;
private final Duration defaultRandomizationInterval;
private final Duration maxBackOff;
private final double backOffRandomFactor;
private Duration nextBackOff;
private boolean deleted;
private Instant deleteAt;
private boolean acknowledged;
private final Address selfRemoteAddress;
@SuppressWarnings("unused")
private SubjectExpiryActor(final PolicyId policyId,
final Subject subject,
final Duration gracePeriod,
final DistributedPub<PolicyAnnouncement<?>> policyAnnouncementPub,
final Duration maxTimeout,
final ActorRef commandForwarder,
final PolicyAnnouncementConfig config) {
this.policyId = policyId;
this.subject = subject;
this.gracePeriod = gracePeriod;
this.policyAnnouncementPub = policyAnnouncementPub;
enableAnnouncementsWhenDeleted = config.isEnableAnnouncementsWhenDeleted();
defaultRandomizationInterval = config.getDefaultRandomizationInterval();
this.commandForwarder = commandForwarder;
sudoDeleteExpiredSubject =
SudoDeleteExpiredSubject.of(policyId, subject,
DittoHeaders.newBuilder().responseRequired(false).build());
persistenceTimeout = maxTimeout;
final var backOffConfig = config.getExponentialBackOffConfig();
maxBackOff = backOffConfig.getMax();
backOffRandomFactor = Math.max(0.0, backOffConfig.getRandomFactor());
nextBackOff = backOffConfig.getMin();
deleted = false;
deleteAt = subject.getExpiry().map(SubjectExpiry::getTimestamp).orElseGet(Instant::now);
acknowledged = false;
selfRemoteAddress = Cluster.get(getContext().systemImpl()).selfUniqueAddress().address();
}
/**
* Create the Props object for this actor.
*
* @param policyId the policy ID.
* @param subject the subject.
* @param gracePeriod how long overdue acknowledgements are tolerated.
* @param policyAnnouncementPub Ditto pubsub API to publish policy announcements.
* @param maxTimeout the maximum timeout.
* @param forwarder actor to forward policy commands to.
* @param config the policy announcement config.
* @return The Props object.
*/
public static Props props(final PolicyId policyId,
final Subject subject,
final Duration gracePeriod,
final DistributedPub<PolicyAnnouncement<?>> policyAnnouncementPub,
final Duration maxTimeout,
final ActorRef forwarder,
final PolicyAnnouncementConfig config) {
return Props.create(SubjectExpiryActor.class,
policyId,
subject,
gracePeriod,
policyAnnouncementPub,
maxTimeout,
forwarder,
config);
}
@Override
public void preStart() {
when(TO_ANNOUNCE, toAnnounce());
when(TO_ACKNOWLEDGE, toAcknowledge());
when(TO_DELETE, toDelete());
when(DELETED, persistenceTimeout, afterDeleted());
whenUnhandled(matchAnyEvent((event, notUsed) -> {
log.warning("Received unexpected message <{}> in state <{}>", event, stateName());
return stay();
}));
onTransition((from, to) -> log.debug("StateTransition <{}> to <{}>", from, to));
if (subject.getAnnouncement().flatMap(SubjectAnnouncement::getBeforeExpiry).isPresent()) {
log.debug("Starting in <{}>", TO_ANNOUNCE);
startWith(TO_ANNOUNCE, NULL);
final Instant now = Instant.now();
scheduleAnnouncement(now, getAnnouncementInstant().orElse(now));
} else {
log.debug("Starting in <{}>", TO_DELETE);
startWith(TO_DELETE, NULL);
subject.getExpiry().ifPresent(this::scheduleDeleteExpiredSubject);
}
initialize();
}
private FSMStateFunctionBuilder<SubjectExpiryState, NotUsed> toAnnounce() {
return matchEventEquals(Message.SUBJECT_DELETED, this::subjectDeletedInToAnnounce)
.eventEquals(Message.ANNOUNCE, this::announce);
// ACKNOWLEDGED/DELETE: impossible
}
private FSMStateFunctionBuilder<SubjectExpiryState, NotUsed> toAcknowledge() {
return matchEvent(Acknowledgements.class, this::onAcknowledgements)
.event(DittoRuntimeException.class, this::exceptionInToAcknowledge)
.eventEquals(Message.ACKNOWLEDGED, this::acknowledged)
.eventEquals(Message.SUBJECT_DELETED, this::subjectDeletedInToAcknowledge);
// ANNOUNCE: don't care, already announced
}
private FSMStateFunctionBuilder<SubjectExpiryState, NotUsed> toDelete() {
return matchEventEquals(Message.DELETE, this::delete)
.eventEquals(Message.SUBJECT_DELETED, this::subjectDeletedInToDelete);
// ACKNOWLEDGED/ANNOUNCE: don't care, already deleted
}
private FSMStateFunctionBuilder<SubjectExpiryState, NotUsed> afterDeleted() {
return matchEventEquals(Message.SUBJECT_DELETED, this::subjectDeletedInDeleted)
.eventEquals(StateTimeout(), this::timeoutInDeleted);
// ACKNOWLEDGED/ANNOUNCE/DELETE: don't care, already deleted
}
private State<SubjectExpiryState, NotUsed> delete(final Message delete, final NotUsed notUsed) {
log.debug("Got DELETE in TO_DELETE");
return scheduleDeleteExpiredSubjectIfNeeded();
}
private State<SubjectExpiryState, NotUsed> announce(final Message announce, final NotUsed notUsed) {
log.debug("Got ANNOUNCE in TO_ANNOUNCE");
cancelTimer(Message.ANNOUNCE.name());
if (!(deleted && shouldAnnounceWhenDeleted())) {
final Instant now = Instant.now();
final Optional<Instant> announcementInstantOpt = getAnnouncementInstant();
if (announcementInstantOpt.isPresent()) {
final var announcementInstant = announcementInstantOpt.get();
if (!announcementInstant.isBefore(now.plus(ANNOUNCEMENT_WINDOW))) {
// ANNOUNCE arrived too early due to e.g. limitation in timer
scheduleAnnouncement(now, announcementInstant);
return stay();
}
}
}
final boolean directlyAckMessage = startAckregatorAndPublishAnnouncement();
if (directlyAckMessage) {
// if no acks requested, do not wait for acknowledgements.
getSelf().tell(Message.ACKNOWLEDGED, ActorRef.noSender());
}
return goTo(TO_ACKNOWLEDGE);
}
private State<SubjectExpiryState, NotUsed> exceptionInToAcknowledge(final DittoRuntimeException exception,
final NotUsed notUsed) {
final var l = log.withCorrelationId(exception);
l.info("Got exception waiting for acknowledgements: <{}: {}>", exception.getClass().getSimpleName(),
exception.getMessage());
if (requiresRedelivery(exception.getHttpStatus())) {
return retryAnnouncementAfterBackOff(l);
} else {
l.warning("Exception unrecoverable, giving up: <{}: {}>", exception.getClass().getSimpleName(),
exception.getMessage());
return scheduleDeleteExpiredSubjectIfNeeded();
}
}
private State<SubjectExpiryState, NotUsed> processSubjectDeletedAndCheckForAnnouncement(
final State<SubjectExpiryState, NotUsed> stateForNoAnnouncement
) {
setDeleteAt();
if (!acknowledged && shouldAnnounceWhenDeleted()) {
// announce immediately
cancelTimer(Message.ANNOUNCE.name());
getSelf().tell(Message.ANNOUNCE, ActorRef.noSender());
return goTo(TO_ANNOUNCE);
} else {
return stateForNoAnnouncement;
}
}
private void setDeleteAt() {
if (!deleted) {
deleted = true;
deleteAt = Instant.now();
}
}
private State<SubjectExpiryState, NotUsed> subjectDeletedInToAnnounce(final Message subjectDeleted,
final NotUsed notUsed) {
log.debug("Got SUBJECT_DELETED in TO_ANNOUNCE");
return processSubjectDeletedAndCheckForAnnouncement(stay());
}
private State<SubjectExpiryState, NotUsed> subjectDeletedInToAcknowledge(final Message subjectDeleted,
final NotUsed notUsed) {
log.debug("Got SUBJECT_DELETED in TO_ACKNOWLEDGE");
setDeleteAt();
return stay(); // no need to schedule whenDeleted announcements because announcement and backoff already active
}
private State<SubjectExpiryState, NotUsed> subjectDeletedInToDelete(final Message subjectDeleted,
final NotUsed notUsed) {
log.debug("Got SUBJECT_DELETED in TO_DELETE");
return processSubjectDeletedAndCheckForAnnouncement(stop());
}
private State<SubjectExpiryState, NotUsed> subjectDeletedInDeleted(final Message subjectDeleted,
final NotUsed notUsed) {
log.debug("Got SUBJECT_DELETED in DELETED");
return processSubjectDeletedAndCheckForAnnouncement(stop());
}
private State<SubjectExpiryState, NotUsed> timeoutInDeleted(final StateTimeout$ timeout, final NotUsed notUsed) {
if (deleted) {
log.error("Timeout in DELETED with subject already deleted. This should not happen.");
return stop();
}
log.debug("Timeout in DELETED");
final boolean shouldAnnounce = shouldAnnounceWhenDeleted();
final boolean inGracePeriod = isInGracePeriod(Instant.now().plus(nextBackOff));
if (acknowledged || !shouldAnnounce || !inGracePeriod) {
log.error("Timeout waiting for ACKs, giving up. acknowledged=<{}> shouldAnnounce=<{}> " +
"inGracePeriod=<{}>", acknowledged, shouldAnnounce, inGracePeriod);
return stop();
} else {
// retry deletion
commandForwarder.tell(sudoDeleteExpiredSubject, ActorRef.noSender());
return goTo(DELETED);
}
}
private State<SubjectExpiryState, NotUsed> acknowledged(final Message acknowledged, final NotUsed notUsed) {
log.debug("Got ACKNOWLEDGED in TO_ACKNOWLEDGE");
this.acknowledged = true;
return scheduleDeleteExpiredSubjectIfNeeded();
}
private State<SubjectExpiryState, NotUsed> onAcknowledgements(final Acknowledgements acknowledgements,
final NotUsed notUsed) {
final var l = log.withCorrelationId(acknowledgements);
l.debug("onAcknowledgements <{}>", acknowledgements);
if (shouldRetry(acknowledgements)) {
return retryAnnouncementAfterBackOff(l);
} else {
// acknowledgements are successful
acknowledged = true;
return scheduleDeleteExpiredSubjectIfNeeded();
}
}
private State<SubjectExpiryState, NotUsed> retryAnnouncementAfterBackOff(final DittoDiagnosticLoggingAdapter l) {
// back off && retry
final Instant now = Instant.now();
nextBackOff = increaseBackOff(nextBackOff);
final Instant announcementInstant = now.plus(nextBackOff);
if (isInGracePeriod(announcementInstant)) {
l.debug("Retrying in grace period <{}>", announcementInstant);
scheduleAnnouncement(now, announcementInstant);
return goTo(TO_ANNOUNCE);
} else if (deleted) {
// subject already deleted; give up
// log as error as this must not happen without a downtime of the service < gracePeriod
l.error("Grace period past for deleted subject <{}>. Giving up.", subject);
return stop();
} else {
// outside of grace period; delete
l.info("Grace period past for subject <{}>. Deleting.", subject);
commandForwarder.tell(sudoDeleteExpiredSubject, ActorRef.noSender());
return goTo(DELETED);
}
}
private State<SubjectExpiryState, NotUsed> scheduleDeleteExpiredSubjectIfNeeded() {
if (!deleted) {
return goTo(subject.getExpiry()
.map(this::scheduleDeleteExpiredSubject)
.orElseGet(() -> {
doDelete();
return DELETED;
}));
} else if (acknowledged) {
// subject already deleted; nothing to announce; already acknowledged
return stop();
} else {
// not acknowledged but deleted
getSelf().tell(Message.SUBJECT_DELETED, ActorRef.noSender());
return goTo(DELETED);
}
}
private SubjectExpiryState scheduleDeleteExpiredSubject(final SubjectExpiry expiry) {
final Instant expiryTimestamp = expiry.getTimestamp();
final Duration duration = Duration.between(Instant.now(), expiryTimestamp);
if (duration.isNegative() || duration.isZero()) {
log.debug("subject expired, deleting: <{}>", subject);
doDelete();
return DELETED;
} else {
final Duration scheduleDuration = truncateToOneDay(duration.plus(ANNOUNCEMENT_WINDOW));
log.debug("Scheduling deletion in: <{}> - cutOff=<{}>", scheduleDuration, expiryTimestamp);
final var delete = Message.DELETE;
startSingleTimer(delete.name(), delete, scheduleDuration);
return TO_DELETE;
}
}
private void doDelete() {
commandForwarder.tell(sudoDeleteExpiredSubject, ActorRef.noSender());
cancelTimer(Message.DELETE.name());
}
private boolean shouldAnnounceWhenDeleted() {
return enableAnnouncementsWhenDeleted &&
subject.getAnnouncement().filter(SubjectAnnouncement::isWhenDeleted).isPresent();
}
private static boolean shouldRetry(final Acknowledgements acks) {
return acks.stream()
.map(Acknowledgement::getHttpStatus)
.anyMatch(SubjectExpiryActor::requiresRedelivery);
}
private boolean isInGracePeriod(final Instant announcementInstant) {
final Instant expiration = subject.getExpiry().map(SubjectExpiry::getTimestamp).orElse(deleteAt);
return announcementInstant.isBefore(expiration.plus(gracePeriod));
}
private void scheduleAnnouncement(final Instant now, final Instant announcementInstant) {
final Duration duration = Duration.between(now, announcementInstant);
if (duration.minus(ANNOUNCEMENT_WINDOW).isNegative()) {
// should announce right away: announcementInstant is within the announcement window
// this happens for deleted subjects.
log.debug("scheduleAnnouncement called with now=<{}>, cutOff=<{}>", now, announcementInstant);
getSelf().tell(Message.ANNOUNCE, ActorRef.noSender());
} else {
final Duration scheduleDuration = truncateToOneDay(duration);
log.debug("Scheduling message for sending announcement in: <{}> - cutOff=<{}>",
scheduleDuration, announcementInstant);
final var announce = Message.ANNOUNCE;
startSingleTimer(announce.name(), announce, scheduleDuration);
}
}
private boolean startAckregatorAndPublishAnnouncement() {
if (!acknowledged && subject.getAnnouncement().isPresent()) {
final PolicyAnnouncement<?> announcement = getAnnouncement();
return startAckregator(announcement);
} else {
// already acknowledged
return true;
}
}
private boolean startAckregator(final PolicyAnnouncement<?> announcement) {
if (announcement.getDittoHeaders().getAcknowledgementRequests().isEmpty()) {
return handleSignalWithoutAckregator(announcement);
} else {
return handleSignalWithAckregator(announcement);
}
}
private void onAggregatedResponseOrError(final Object responseOrError) {
getSelf().tell(responseOrError, ActorRef.noSender());
}
private boolean handleSignalWithAckregator(final PolicyAnnouncement<?> announcement) {
final ActorRef aggregatorActor = startAcknowledgementAggregator(announcement);
log.withCorrelationId(announcement)
.info("Publishing PolicyAnnouncement with ack requests: <{}>", announcement.getType());
log.withCorrelationId(announcement)
.debug("Publishing PolicyAnnouncement with ack requests: <{}>", announcement);
final String addressSerializationFormat = aggregatorActor.path()
.toSerializationFormatWithAddress(selfRemoteAddress);
final PolicyAnnouncement<?> adjustedSignal =
announcement.setDittoHeaders(announcement.getDittoHeaders().toBuilder()
.putHeader(DittoHeaderDefinition.DITTO_ACKREGATOR_ADDRESS.getKey(), addressSerializationFormat)
.build());
policyAnnouncementPub.publishWithAcks(adjustedSignal, policyId, ACK_EXTRACTOR, aggregatorActor);
return false;
}
private ActorRef startAcknowledgementAggregator(final PolicyAnnouncement<?> announcement) {
final Duration timeout = announcement.getDittoHeaders().getTimeout().orElse(persistenceTimeout);
// cap used timeout to max timeout defined by persistenceTimeout
final Duration useTimeout = timeout.compareTo(persistenceTimeout) > 0 ? persistenceTimeout : timeout;
final Props props = PolicyAnnouncementAcknowledgementAggregatorActor.props(announcement, useTimeout,
this::onAggregatedResponseOrError);
return getContext().actorOf(props);
}
private boolean handleSignalWithoutAckregator(final Signal<?> signalWithoutAckregator) {
log.withCorrelationId(signalWithoutAckregator)
.info("Publishing PolicyAnnouncement: <{}>", signalWithoutAckregator.getType());
log.withCorrelationId(signalWithoutAckregator)
.debug("Publishing PolicyAnnouncement: <{}>", signalWithoutAckregator);
policyAnnouncementPub.publishWithAcks((PolicyAnnouncement<?>) signalWithoutAckregator, policyId, ACK_EXTRACTOR,
ActorRef.noSender());
return true;
}
private PolicyAnnouncement<?> getAnnouncement() {
return SubjectDeletionAnnouncement.of(policyId, deleteAt, List.of(subject.getId()), getAnnouncementHeaders());
}
private DittoHeaders getAnnouncementHeaders() {
final DittoHeadersBuilder<?, ?> builder = DittoHeaders.newBuilder().randomCorrelationId();
subject.getAnnouncement().ifPresent(subjectAnnouncement -> {
builder.acknowledgementRequests(subjectAnnouncement.getRequestedAcksLabels());
subjectAnnouncement.getRequestedAcksTimeout().ifPresent(builder::timeout);
});
return builder.build();
}
/**
* Gets the instant when the announcement should be sent (instant of expiry - time before expiry that the
* announcement should be sent)
*/
private Optional<Instant> getAnnouncementInstant() {
return subject.getAnnouncement()
.flatMap(SubjectAnnouncement::getBeforeExpiry)
.flatMap(beforeExpiry -> subject.getExpiry()
.map(expiry -> expiry.getTimestamp().minus(beforeExpiry.getDuration())))
.flatMap(this::subtractRandomFactor);
}
/**
* subtract a random factor from the announcement instant in effort to prevent policy announcement bulks, which
* could cause to dropped messages in connections not consuming fast enough.
*/
private Optional<Instant> subtractRandomFactor(final Instant announcementInstant) {
return subject.getAnnouncement()
.map(a -> a.getRandomizationInterval().orElse(DittoDuration.of(defaultRandomizationInterval)))
.map(interval -> announcementInstant.minusMillis(getRandomMillis(interval)));
}
private long getRandomMillis(final DittoDuration interval) {
final long intervalMillis = interval.getDuration().toMillis();
return intervalMillis > 0 ? ThreadLocalRandom.current().nextLong(intervalMillis) : intervalMillis;
}
private static Duration truncateToOneDay(final Duration duration) {
final Duration oneDay = Duration.ofDays(1);
return duration.compareTo(oneDay) < 0 ? duration : oneDay;
}
private static boolean requiresRedelivery(final HttpStatus status) {
if (HttpStatus.REQUEST_TIMEOUT.equals(status) || HttpStatus.FAILED_DEPENDENCY.equals(status)) {
return true;
}
return status.isServerError();
}
private Duration increaseBackOff(final Duration requestedBackOff) {
final Duration backOff = maxBackOff.minus(requestedBackOff).isNegative() ? maxBackOff : requestedBackOff;
final double factor = 0.5 + 0.5 * backOffRandomFactor * Random$.MODULE$.nextFloat();
final Duration result = backOff.plus(Duration.ofMillis((long) (backOff.toMillis() * factor)));
if (result.isNegative() || result.minus(requestedBackOff).isNegative() ||
maxBackOff.minus(result).isNegative()) {
// use maxBackOff if next backoff exceeds it or overflows
return maxBackOff;
} else {
return result;
}
}
/**
* Messages of this actor.
*/
public enum Message {
/**
* Message to receive when the subject is deleted.
*/
SUBJECT_DELETED,
/**
* Message to receive when a subject deletion announcement is acknowledged.
*/
ACKNOWLEDGED,
/**
* Message to receive when it is time to send a policy deletion announcement.
*/
ANNOUNCE,
/**
* Message to receive when it is time to delete the subject.
*/
DELETE
}
}