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Java idiomatic client for Google Cloud Pub/Sub
/*
* Copyright 2016 Google LLC
*
* 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 com.google.cloud.pubsub.v1;
import com.google.api.core.ApiClock;
import com.google.api.core.ApiFutureCallback;
import com.google.api.core.ApiFutures;
import com.google.api.core.InternalApi;
import com.google.api.core.SettableApiFuture;
import com.google.api.gax.batching.FlowController;
import com.google.api.gax.batching.FlowController.FlowControlException;
import com.google.api.gax.core.Distribution;
import com.google.common.primitives.Ints;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.pubsub.v1.PubsubMessage;
import com.google.pubsub.v1.ReceivedMessage;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.Executor;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.threeten.bp.Duration;
import org.threeten.bp.Instant;
import org.threeten.bp.temporal.ChronoUnit;
/**
* Dispatches messages to a message receiver while handling the messages acking and lease
* extensions.
*/
class MessageDispatcher {
private static final Logger logger = Logger.getLogger(MessageDispatcher.class.getName());
@InternalApi static final double PERCENTILE_FOR_ACK_DEADLINE_UPDATES = 99.9;
@InternalApi static final Duration PENDING_ACKS_SEND_DELAY = Duration.ofMillis(100);
private final Executor executor;
private final SequentialExecutorService.AutoExecutor sequentialExecutor;
private final ScheduledExecutorService systemExecutor;
private final ApiClock clock;
private final Duration ackExpirationPadding;
private final Duration maxAckExtensionPeriod;
private int minDurationPerAckExtensionSeconds;
private final boolean minDurationPerAckExtensionDefaultUsed;
private final int maxDurationPerAckExtensionSeconds;
private final boolean maxDurationPerAckExtensionDefaultUsed;
// Only one of receiver or receiverWithAckResponse will be set
private MessageReceiver receiver;
private MessageReceiverWithAckResponse receiverWithAckResponse;
private final AckProcessor ackProcessor;
private final FlowController flowController;
private AtomicBoolean exactlyOnceDeliveryEnabled = new AtomicBoolean(false);
private AtomicBoolean messageOrderingEnabled = new AtomicBoolean(false);
private final Waiter messagesWaiter;
// Maps ID to "total expiration time". If it takes longer than this, stop extending.
private final ConcurrentMap pendingMessages = new ConcurrentHashMap<>();
private final LinkedBlockingQueue pendingAcks = new LinkedBlockingQueue<>();
private final LinkedBlockingQueue pendingNacks = new LinkedBlockingQueue<>();
private final LinkedBlockingQueue pendingReceipts = new LinkedBlockingQueue<>();
private final LinkedHashMap outstandingReceipts =
new LinkedHashMap();
private final AtomicInteger messageDeadlineSeconds = new AtomicInteger();
private final AtomicBoolean extendDeadline = new AtomicBoolean(true);
private final Lock jobLock;
private ScheduledFuture backgroundJob;
private ScheduledFuture setExtendedDeadlineFuture;
// To keep track of number of seconds the receiver takes to process messages.
private final Distribution ackLatencyDistribution;
/** Internal representation of a reply to a Pubsub message, to be sent back to the service. */
public enum AckReply {
ACK,
NACK
}
/** Handles callbacks for acking/nacking messages from the {@link MessageReceiver}. */
private class AckHandler implements ApiFutureCallback {
private final AckRequestData ackRequestData;
private final int outstandingBytes;
private final long receivedTimeMillis;
private final Instant totalExpiration;
private AckHandler(
AckRequestData ackRequestData, int outstandingBytes, Instant totalExpiration) {
this.ackRequestData = ackRequestData;
this.outstandingBytes = outstandingBytes;
this.receivedTimeMillis = clock.millisTime();
this.totalExpiration = totalExpiration;
}
public AckRequestData getAckRequestData() {
return ackRequestData;
}
public SettableApiFuture getMessageFutureIfExists() {
return this.ackRequestData.getMessageFutureIfExists();
}
/** Stop extending deadlines for this message and free flow control. */
private void forget() {
if (pendingMessages.remove(this.ackRequestData.getAckId()) == null) {
/*
* We're forgetting the message for the second time. Probably because we ran out of total
* expiration, forget the message, then the user finishes working on the message, and forget
* again. Turn the second forget into a no-op so we don't free twice.
*/
return;
}
flowController.release(1, outstandingBytes);
messagesWaiter.incrementPendingCount(-1);
}
@Override
public void onFailure(Throwable t) {
logger.log(
Level.WARNING,
"MessageReceiver failed to process ack ID: "
+ this.ackRequestData.getAckId()
+ ", the message will be nacked.",
t);
this.ackRequestData.setResponse(AckResponse.OTHER, false);
pendingNacks.add(this.ackRequestData);
forget();
}
@Override
public void onSuccess(AckReply reply) {
switch (reply) {
case ACK:
pendingAcks.add(this.ackRequestData);
// Record the latency rounded to the next closest integer.
ackLatencyDistribution.record(
Ints.saturatedCast(
(long) Math.ceil((clock.millisTime() - receivedTimeMillis) / 1000D)));
break;
case NACK:
pendingNacks.add(this.ackRequestData);
break;
default:
throw new IllegalArgumentException(String.format("AckReply: %s not supported", reply));
}
forget();
}
}
interface AckProcessor {
public void sendAckOperations(List ackRequestDataList);
public void sendModackOperations(List modackRequestDataList);
}
private MessageDispatcher(Builder builder) {
executor = builder.executor;
systemExecutor = builder.systemExecutor;
ackExpirationPadding = builder.ackExpirationPadding;
maxAckExtensionPeriod = builder.maxAckExtensionPeriod;
minDurationPerAckExtensionSeconds =
Math.toIntExact(builder.minDurationPerAckExtension.getSeconds());
minDurationPerAckExtensionDefaultUsed = builder.minDurationPerAckExtensionDefaultUsed;
maxDurationPerAckExtensionSeconds =
Math.toIntExact(builder.maxDurationPerAckExtension.getSeconds());
maxDurationPerAckExtensionDefaultUsed = builder.maxDurationPerAckExtensionDefaultUsed;
// Start the deadline at the minimum ack deadline so messages which arrive before this is
// updated will not have a long ack deadline.
if (minDurationPerAckExtensionDefaultUsed) {
messageDeadlineSeconds.set(Math.toIntExact(Subscriber.MIN_STREAM_ACK_DEADLINE.getSeconds()));
} else {
messageDeadlineSeconds.set(minDurationPerAckExtensionSeconds);
}
receiver = builder.receiver;
receiverWithAckResponse = builder.receiverWithAckResponse;
ackProcessor = builder.ackProcessor;
flowController = builder.flowController;
ackLatencyDistribution = builder.ackLatencyDistribution;
clock = builder.clock;
jobLock = new ReentrantLock();
messagesWaiter = new Waiter();
sequentialExecutor = new SequentialExecutorService.AutoExecutor(builder.executor);
}
private boolean shouldSetMessageFuture() {
return receiverWithAckResponse != null;
}
void start() {
final Runnable setExtendDeadline =
new Runnable() {
@Override
public void run() {
extendDeadline.set(true);
}
};
jobLock.lock();
try {
// Do not adjust deadline concurrently with extendDeadline or processOutstandingAckOperations.
// The following sequence can happen:
// 0. Initially, deadline = 1 min
// 1. Thread A (TA) wants to send receipts, reads deadline = 1m, but stalls before actually
// sending request
// 2. Thread B (TB) adjusts deadline to 2m
// 3. TB calls extendDeadline, modack all messages to 2m, schedules next extension in 2m
// 4. TA sends request, modacking messages to 1m.
// Then messages will expire too early.
// This can be resolved by adding locks in the right places, but at that point,
// we might as well do things sequentially.
backgroundJob =
systemExecutor.scheduleWithFixedDelay(
new Runnable() {
@Override
public void run() {
try {
if (extendDeadline.getAndSet(false)) {
int newDeadlineSec = computeDeadlineSeconds();
messageDeadlineSeconds.set(newDeadlineSec);
extendDeadlines();
if (setExtendedDeadlineFuture != null && !backgroundJob.isDone()) {
setExtendedDeadlineFuture.cancel(true);
}
setExtendedDeadlineFuture =
systemExecutor.schedule(
setExtendDeadline,
newDeadlineSec - ackExpirationPadding.getSeconds(),
TimeUnit.SECONDS);
}
processOutstandingOperations();
} catch (Throwable t) {
// Catch everything so that one run failing doesn't prevent subsequent runs.
logger.log(Level.WARNING, "failed to run periodic job", t);
}
}
},
PENDING_ACKS_SEND_DELAY.toMillis(),
PENDING_ACKS_SEND_DELAY.toMillis(),
TimeUnit.MILLISECONDS);
} finally {
jobLock.unlock();
}
}
void stop() {
messagesWaiter.waitComplete();
jobLock.lock();
try {
if (backgroundJob != null) {
backgroundJob.cancel(false);
}
if (setExtendedDeadlineFuture != null) {
setExtendedDeadlineFuture.cancel(true);
}
backgroundJob = null;
setExtendedDeadlineFuture = null;
} finally {
jobLock.unlock();
}
processOutstandingOperations();
}
@InternalApi
void setMessageDeadlineSeconds(int sec) {
messageDeadlineSeconds.set(sec);
}
@InternalApi
int getMessageDeadlineSeconds() {
return messageDeadlineSeconds.get();
}
@InternalApi
void setExactlyOnceDeliveryEnabled(boolean exactlyOnceDeliveryEnabled) {
// Sanity check that we are changing the exactlyOnceDeliveryEnabled state
if (exactlyOnceDeliveryEnabled == this.exactlyOnceDeliveryEnabled.get()) {
return;
}
this.exactlyOnceDeliveryEnabled.set(exactlyOnceDeliveryEnabled);
// If a custom value for minDurationPerAckExtension, we should respect that
if (!minDurationPerAckExtensionDefaultUsed) {
return;
}
// We just need to update the minDurationPerAckExtensionSeconds as the
// maxDurationPerAckExtensionSeconds does not change
int possibleNewMinAckDeadlineExtensionSeconds;
if (exactlyOnceDeliveryEnabled) {
possibleNewMinAckDeadlineExtensionSeconds =
Math.toIntExact(
Subscriber.DEFAULT_MIN_ACK_DEADLINE_EXTENSION_EXACTLY_ONCE_DELIVERY.getSeconds());
} else {
possibleNewMinAckDeadlineExtensionSeconds =
Math.toIntExact(Subscriber.DEFAULT_MIN_ACK_DEADLINE_EXTENSION.getSeconds());
}
// If we are not using the default maxDurationAckExtension, check if the
// minAckDeadlineExtensionExactlyOnceDelivery needs to be bounded by the set max
if (!maxDurationPerAckExtensionDefaultUsed
&& (possibleNewMinAckDeadlineExtensionSeconds > maxDurationPerAckExtensionSeconds)) {
minDurationPerAckExtensionSeconds = maxDurationPerAckExtensionSeconds;
} else {
minDurationPerAckExtensionSeconds = possibleNewMinAckDeadlineExtensionSeconds;
}
}
@InternalApi
void setMessageOrderingEnabled(boolean messageOrderingEnabled) {
this.messageOrderingEnabled.set(messageOrderingEnabled);
}
private static class OutstandingMessage {
private final ReceivedMessage receivedMessage;
private final AckHandler ackHandler;
private OutstandingMessage(ReceivedMessage receivedMessage, AckHandler ackHandler) {
this.receivedMessage = receivedMessage;
this.ackHandler = ackHandler;
}
}
private static class ReceiptCompleteData {
private OutstandingMessage outstandingMessage;
private Boolean receiptComplete;
private ReceiptCompleteData(OutstandingMessage outstandingMessage) {
this.outstandingMessage = outstandingMessage;
this.receiptComplete = false;
}
private OutstandingMessage getOutstandingMessage() {
return this.outstandingMessage;
}
private Boolean isReceiptComplete() {
return this.receiptComplete;
}
private void notifyReceiptComplete() {
this.receiptComplete = true;
}
}
void processReceivedMessages(List messages) {
Instant totalExpiration = now().plus(maxAckExtensionPeriod);
List outstandingBatch = new ArrayList<>(messages.size());
for (ReceivedMessage message : messages) {
AckRequestData.Builder builder = AckRequestData.newBuilder(message.getAckId());
if (shouldSetMessageFuture()) {
builder.setMessageFuture(SettableApiFuture.create());
}
AckRequestData ackRequestData = builder.build();
AckHandler ackHandler =
new AckHandler(ackRequestData, message.getMessage().getSerializedSize(), totalExpiration);
OutstandingMessage outstandingMessage = new OutstandingMessage(message, ackHandler);
if (this.exactlyOnceDeliveryEnabled.get()) {
// For exactly once deliveries we don't add to outstanding batch because we first
// process the receipt modack. If that is successful then we process the message.
synchronized (outstandingReceipts) {
outstandingReceipts.put(message.getAckId(), new ReceiptCompleteData(outstandingMessage));
}
} else if (pendingMessages.putIfAbsent(message.getAckId(), ackHandler) != null) {
// putIfAbsent puts ackHandler if ackID isn't previously mapped, then return the
// previously-mapped element.
// If the previous element is not null, we already have the message and the new one is
// definitely a duplicate.
// Don't nack this, because that'd also nack the one we already have in queue.
// Don't update the existing one's total expiration either. If the user "loses" the message,
// we want to eventually
// totally expire so that pubsub service sends us the message again.
continue;
} else {
outstandingBatch.add(outstandingMessage);
}
pendingReceipts.add(ackRequestData);
}
processBatch(outstandingBatch);
}
void notifyAckSuccess(AckRequestData ackRequestData) {
synchronized (outstandingReceipts) {
if (outstandingReceipts.containsKey(ackRequestData.getAckId())) {
outstandingReceipts.get(ackRequestData.getAckId()).notifyReceiptComplete();
List outstandingBatch = new ArrayList<>();
for (Iterator> it =
outstandingReceipts.entrySet().iterator();
it.hasNext(); ) {
Map.Entry receipt = it.next();
// If receipt is complete then add to outstandingBatch to process the batch
if (receipt.getValue().isReceiptComplete()) {
it.remove();
if (pendingMessages.putIfAbsent(
receipt.getKey(), receipt.getValue().getOutstandingMessage().ackHandler)
== null) {
outstandingBatch.add(receipt.getValue().getOutstandingMessage());
}
} else {
break;
}
}
processBatch(outstandingBatch);
}
}
}
void notifyAckFailed(AckRequestData ackRequestData) {
synchronized (outstandingReceipts) {
outstandingReceipts.remove(ackRequestData.getAckId());
}
}
private void processBatch(List batch) {
messagesWaiter.incrementPendingCount(batch.size());
for (OutstandingMessage message : batch) {
// This is a blocking flow controller. We have already incremented messagesWaiter, so
// shutdown will block on processing of all these messages anyway.
try {
flowController.reserve(1, message.receivedMessage.getMessage().getSerializedSize());
} catch (FlowControlException unexpectedException) {
// This should be a blocking flow controller and never throw an exception.
throw new IllegalStateException("Flow control unexpected exception", unexpectedException);
}
processOutstandingMessage(addDeliveryInfoCount(message.receivedMessage), message.ackHandler);
}
}
private PubsubMessage addDeliveryInfoCount(ReceivedMessage receivedMessage) {
PubsubMessage originalMessage = receivedMessage.getMessage();
int deliveryAttempt = receivedMessage.getDeliveryAttempt();
// Delivery Attempt will be set to 0 if DeadLetterPolicy is not set on the subscription. In
// this case, do not populate the PubsubMessage with the delivery attempt attribute.
if (deliveryAttempt > 0) {
return PubsubMessage.newBuilder(originalMessage)
.putAttributes("googclient_deliveryattempt", Integer.toString(deliveryAttempt))
.build();
}
return originalMessage;
}
private void processOutstandingMessage(final PubsubMessage message, final AckHandler ackHandler) {
// This future is for internal bookkeeping to be sent to the StreamingSubscriberConnection
// use below in the consumers
SettableApiFuture ackReplySettableApiFuture = SettableApiFuture.create();
ApiFutures.addCallback(ackReplySettableApiFuture, ackHandler, MoreExecutors.directExecutor());
Runnable deliverMessageTask =
new Runnable() {
@Override
public void run() {
try {
if (ackHandler
.totalExpiration
.plusSeconds(messageDeadlineSeconds.get())
.isBefore(now())) {
// Message expired while waiting. We don't extend these messages anymore,
// so it was probably sent to someone else. Don't work on it.
// Don't nack it either, because we'd be nacking someone else's message.
ackHandler.forget();
return;
}
if (shouldSetMessageFuture()) {
// This is the message future that is propagated to the user
SettableApiFuture messageFuture =
ackHandler.getMessageFutureIfExists();
final AckReplyConsumerWithResponse ackReplyConsumerWithResponse =
new AckReplyConsumerWithResponseImpl(ackReplySettableApiFuture, messageFuture);
receiverWithAckResponse.receiveMessage(message, ackReplyConsumerWithResponse);
} else {
final AckReplyConsumer ackReplyConsumer =
new AckReplyConsumerImpl(ackReplySettableApiFuture);
receiver.receiveMessage(message, ackReplyConsumer);
}
} catch (Exception e) {
ackReplySettableApiFuture.setException(e);
}
}
};
if (!messageOrderingEnabled.get() || message.getOrderingKey().isEmpty()) {
executor.execute(deliverMessageTask);
} else {
sequentialExecutor.submit(message.getOrderingKey(), deliverMessageTask);
}
}
/** Compute the ideal deadline, set subsequent modacks to this deadline, and return it. */
@InternalApi
int computeDeadlineSeconds() {
int deadlineSeconds = ackLatencyDistribution.getPercentile(PERCENTILE_FOR_ACK_DEADLINE_UPDATES);
// Bound deadlineSeconds by extensions
if (!maxDurationPerAckExtensionDefaultUsed
&& (deadlineSeconds > maxDurationPerAckExtensionSeconds)) {
deadlineSeconds = maxDurationPerAckExtensionSeconds;
} else if (deadlineSeconds < minDurationPerAckExtensionSeconds) {
deadlineSeconds = minDurationPerAckExtensionSeconds;
}
// Bound deadlineSeconds by hard limits in subscriber
if (deadlineSeconds < Subscriber.MIN_STREAM_ACK_DEADLINE.getSeconds()) {
deadlineSeconds = Math.toIntExact(Subscriber.MIN_STREAM_ACK_DEADLINE.getSeconds());
} else if (deadlineSeconds > Subscriber.MAX_STREAM_ACK_DEADLINE.getSeconds()) {
deadlineSeconds = Math.toIntExact(Subscriber.MAX_STREAM_ACK_DEADLINE.getSeconds());
}
return deadlineSeconds;
}
@InternalApi
void extendDeadlines() {
int extendSeconds = getMessageDeadlineSeconds();
int numAckIdToSend = 0;
Map deadlineExtensionModacks =
new HashMap();
Instant now = now();
Instant extendTo = now.plusSeconds(extendSeconds);
for (Map.Entry entry : pendingMessages.entrySet()) {
String ackId = entry.getKey();
Instant totalExpiration = entry.getValue().totalExpiration;
if (totalExpiration.isAfter(extendTo)) {
ModackRequestData modackRequestData =
deadlineExtensionModacks.computeIfAbsent(
extendSeconds,
deadlineExtensionSeconds -> new ModackRequestData(deadlineExtensionSeconds));
modackRequestData.addAckRequestData(entry.getValue().getAckRequestData());
numAckIdToSend++;
continue;
}
// forget removes from pendingMessages; this is OK, concurrent maps can
// handle concurrent iterations and modifications.
entry.getValue().forget();
if (totalExpiration.isAfter(now)) {
int sec = Math.max(1, (int) now.until(totalExpiration, ChronoUnit.SECONDS));
ModackRequestData modackRequestData =
deadlineExtensionModacks.computeIfAbsent(
sec, extensionSeconds -> new ModackRequestData(extensionSeconds));
modackRequestData.addAckRequestData(entry.getValue().getAckRequestData());
numAckIdToSend++;
}
}
if (numAckIdToSend > 0) {
logger.log(Level.FINER, "Sending {0} modacks", numAckIdToSend);
ackProcessor.sendModackOperations(
new ArrayList(deadlineExtensionModacks.values()));
}
}
@InternalApi
void processOutstandingOperations() {
List modackRequestData = new ArrayList();
// Nacks are modacks with an expiration of 0
List nackRequestDataList = new ArrayList();
pendingNacks.drainTo(nackRequestDataList);
if (!nackRequestDataList.isEmpty()) {
modackRequestData.add(new ModackRequestData(0, nackRequestDataList));
}
logger.log(Level.FINER, "Sending {0} nacks", nackRequestDataList.size());
List ackRequestDataReceipts = new ArrayList();
pendingReceipts.drainTo(ackRequestDataReceipts);
if (!ackRequestDataReceipts.isEmpty()) {
modackRequestData.add(
new ModackRequestData(this.getMessageDeadlineSeconds(), ackRequestDataReceipts));
}
logger.log(Level.FINER, "Sending {0} receipts", ackRequestDataReceipts.size());
ackProcessor.sendModackOperations(modackRequestData);
List ackRequestDataList = new ArrayList();
pendingAcks.drainTo(ackRequestDataList);
logger.log(Level.FINER, "Sending {0} acks", ackRequestDataList.size());
ackProcessor.sendAckOperations(ackRequestDataList);
}
private Instant now() {
return Instant.ofEpochMilli(clock.millisTime());
}
/** Builder of {@link MessageDispatcher MessageDispatchers}. */
public static final class Builder {
private MessageReceiver receiver;
private MessageReceiverWithAckResponse receiverWithAckResponse;
private AckProcessor ackProcessor;
private Duration ackExpirationPadding;
private Duration maxAckExtensionPeriod;
private Duration minDurationPerAckExtension;
private boolean minDurationPerAckExtensionDefaultUsed;
private Duration maxDurationPerAckExtension;
private boolean maxDurationPerAckExtensionDefaultUsed;
private Distribution ackLatencyDistribution;
private FlowController flowController;
private Executor executor;
private ScheduledExecutorService systemExecutor;
private ApiClock clock;
protected Builder(MessageReceiver receiver) {
this.receiver = receiver;
}
protected Builder(MessageReceiverWithAckResponse receiverWithAckResponse) {
this.receiverWithAckResponse = receiverWithAckResponse;
}
public Builder setAckProcessor(AckProcessor ackProcessor) {
this.ackProcessor = ackProcessor;
return this;
}
public Builder setAckExpirationPadding(Duration ackExpirationPadding) {
this.ackExpirationPadding = ackExpirationPadding;
return this;
}
public Builder setMaxAckExtensionPeriod(Duration maxAckExtensionPeriod) {
this.maxAckExtensionPeriod = maxAckExtensionPeriod;
return this;
}
public Builder setMinDurationPerAckExtension(Duration minDurationPerAckExtension) {
this.minDurationPerAckExtension = minDurationPerAckExtension;
return this;
}
public Builder setMinDurationPerAckExtensionDefaultUsed(
boolean minDurationPerAckExtensionDefaultUsed) {
this.minDurationPerAckExtensionDefaultUsed = minDurationPerAckExtensionDefaultUsed;
return this;
}
public Builder setMaxDurationPerAckExtension(Duration maxDurationPerAckExtension) {
this.maxDurationPerAckExtension = maxDurationPerAckExtension;
return this;
}
public Builder setMaxDurationPerAckExtensionDefaultUsed(
boolean maxDurationPerAckExtensionDefaultUsed) {
this.maxDurationPerAckExtensionDefaultUsed = maxDurationPerAckExtensionDefaultUsed;
return this;
}
public Builder setAckLatencyDistribution(Distribution ackLatencyDistribution) {
this.ackLatencyDistribution = ackLatencyDistribution;
return this;
}
public Builder setFlowController(FlowController flowController) {
this.flowController = flowController;
return this;
}
public Builder setExecutor(Executor executor) {
this.executor = executor;
return this;
}
public Builder setSystemExecutor(ScheduledExecutorService systemExecutor) {
this.systemExecutor = systemExecutor;
return this;
}
public Builder setApiClock(ApiClock clock) {
this.clock = clock;
return this;
}
public MessageDispatcher build() {
return new MessageDispatcher(this);
}
}
public static Builder newBuilder(MessageReceiver receiver) {
return new Builder(receiver);
}
public static Builder newBuilder(MessageReceiverWithAckResponse receiverWithAckResponse) {
return new Builder(receiverWithAckResponse);
}
}
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