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PrefetchingMessageListenerContainer.java
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PrefetchingMessageListenerContainer.java
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package com.jashmore.sqs.container.prefetching;
import com.jashmore.documentation.annotations.Nullable;
import com.jashmore.documentation.annotations.Positive;
import com.jashmore.documentation.annotations.PositiveOrZero;
import com.jashmore.sqs.QueueProperties;
import com.jashmore.sqs.broker.MessageBroker;
import com.jashmore.sqs.broker.concurrent.ConcurrentMessageBroker;
import com.jashmore.sqs.broker.concurrent.ConcurrentMessageBrokerProperties;
import com.jashmore.sqs.container.CoreMessageListenerContainer;
import com.jashmore.sqs.container.MessageListenerContainer;
import com.jashmore.sqs.container.StaticCoreMessageListenerContainerProperties;
import com.jashmore.sqs.processor.MessageProcessor;
import com.jashmore.sqs.resolver.MessageResolver;
import com.jashmore.sqs.resolver.batching.BatchingMessageResolver;
import com.jashmore.sqs.retriever.MessageRetriever;
import com.jashmore.sqs.retriever.prefetch.PrefetchingMessageRetriever;
import com.jashmore.sqs.retriever.prefetch.PrefetchingMessageRetrieverProperties;
import java.time.Duration;
import java.util.concurrent.CompletableFuture;
import java.util.function.Supplier;
import software.amazon.awssdk.services.sqs.SqsAsyncClient;
/**
* Container that will prefetch messages and process them concurrently.
*
* @see PrefetchingMessageListenerContainerProperties for configuration options
*/
public class PrefetchingMessageListenerContainer implements MessageListenerContainer {
private final MessageListenerContainer delegate;
public PrefetchingMessageListenerContainer(
final String identifier,
final QueueProperties queueProperties,
final SqsAsyncClient sqsAsyncClient,
final Supplier<MessageProcessor> messageProcessorSupplier,
final PrefetchingMessageListenerContainerProperties properties
) {
delegate =
new CoreMessageListenerContainer(
identifier,
buildMessageBrokerSupplier(properties),
buildMessageRetrieverSupplier(properties, queueProperties, sqsAsyncClient),
messageProcessorSupplier,
buildMessageResolverSupplier(queueProperties, sqsAsyncClient),
StaticCoreMessageListenerContainerProperties
.builder()
.shouldProcessAnyExtraRetrievedMessagesOnShutdown(properties.processAnyExtraRetrievedMessagesOnShutdown())
.shouldInterruptThreadsProcessingMessagesOnShutdown(properties.interruptThreadsProcessingMessagesOnShutdown())
.build()
);
}
private Supplier<MessageBroker> buildMessageBrokerSupplier(final PrefetchingMessageListenerContainerProperties properties) {
return () ->
new ConcurrentMessageBroker(
new ConcurrentMessageBrokerProperties() {
@PositiveOrZero
@Override
public int getConcurrencyLevel() {
return properties.concurrencyLevel();
}
@Nullable
@Positive
@Override
public Duration getConcurrencyPollingRate() {
return properties.concurrencyPollingRate();
}
@Nullable
@PositiveOrZero
@Override
public Duration getErrorBackoffTime() {
return properties.errorBackoffTime();
}
}
);
}
private Supplier<MessageRetriever> buildMessageRetrieverSupplier(
final PrefetchingMessageListenerContainerProperties properties,
final QueueProperties queueProperties,
final SqsAsyncClient sqsAsyncClient
) {
return () ->
new PrefetchingMessageRetriever(
sqsAsyncClient,
queueProperties,
new PrefetchingMessageRetrieverProperties() {
@Positive
@Override
public int getDesiredMinPrefetchedMessages() {
return properties.desiredMinPrefetchedMessages();
}
@Override
public @Positive int getMaxPrefetchedMessages() {
return properties.maxPrefetchedMessages();
}
@Nullable
@Positive
@Override
public Duration getMessageVisibilityTimeout() {
return properties.messageVisibilityTimeout();
}
@Nullable
@PositiveOrZero
@Override
public Duration getErrorBackoffTime() {
return properties.errorBackoffTime();
}
}
);
}
private Supplier<MessageResolver> buildMessageResolverSupplier(
final QueueProperties queueProperties,
final SqsAsyncClient sqsAsyncClient
) {
return () -> new BatchingMessageResolver(queueProperties, sqsAsyncClient);
}
@Override
public String getIdentifier() {
return delegate.getIdentifier();
}
@Override
public CompletableFuture<?> start() {
return delegate.start();
}
@Override
public void stop() {
delegate.stop();
}
@Override
public void stop(final Duration duration) {
delegate.stop(duration);
}
}