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CoreMessageProcessor.java
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CoreMessageProcessor.java
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package com.jashmore.sqs.processor;
import static java.util.stream.Collectors.toList;
import com.jashmore.documentation.annotations.Nullable;
import com.jashmore.documentation.annotations.ThreadSafe;
import com.jashmore.sqs.QueueProperties;
import com.jashmore.sqs.argument.ArgumentResolver;
import com.jashmore.sqs.argument.ArgumentResolverService;
import com.jashmore.sqs.argument.DefaultMethodParameter;
import com.jashmore.sqs.argument.MethodParameter;
import com.jashmore.sqs.processor.argument.Acknowledge;
import com.jashmore.sqs.processor.argument.VisibilityExtender;
import com.jashmore.sqs.util.concurrent.CompletableFutureUtils;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.IntStream;
import lombok.extern.slf4j.Slf4j;
import software.amazon.awssdk.services.sqs.SqsAsyncClient;
import software.amazon.awssdk.services.sqs.model.Message;
/**
* Default implementation of the {@link MessageProcessor} that will simply resolve arguments, process the message and delete the
* message from the queue if it was completed successfully.
*/
@Slf4j
@ThreadSafe
public class CoreMessageProcessor implements MessageProcessor {
private final MessageProcessor delegate;
public CoreMessageProcessor(
final ArgumentResolverService argumentResolverService,
final QueueProperties queueProperties,
final SqsAsyncClient sqsAsyncClient,
final Method messageConsumerMethod,
final Object messageConsumerBean
) {
final boolean hasAcknowledgeParameter = hasAcknowledgeParameter(messageConsumerMethod);
final boolean isAsynchronous = CompletableFuture.class.isAssignableFrom(messageConsumerMethod.getReturnType());
final ArgumentResolvers argumentResolvers = determineArgumentResolvers(
argumentResolverService,
queueProperties,
messageConsumerMethod
);
if (isAsynchronous) {
final Function<Object[], CompletableFuture<?>> messageExecutor = arguments -> {
try {
return (CompletableFuture<?>) messageConsumerMethod.invoke(messageConsumerBean, arguments);
} catch (IllegalAccessException exception) {
return CompletableFutureUtils.completedExceptionally(new MessageProcessingException(exception));
} catch (InvocationTargetException exception) {
return CompletableFutureUtils.completedExceptionally(new MessageProcessingException(exception.getCause()));
}
};
if (hasAcknowledgeParameter) {
this.delegate =
new AsyncLambdaMessageProcessor(
sqsAsyncClient,
queueProperties,
(message, acknowledge, visibilityExtender) -> {
final Object[] arguments = argumentResolvers.resolveArgument(message, acknowledge, visibilityExtender);
return messageExecutor.apply(arguments);
}
);
} else {
this.delegate =
new AsyncLambdaMessageProcessor(
sqsAsyncClient,
queueProperties,
false,
(message, visibilityExtender) -> {
final Object[] arguments = argumentResolvers.resolveArgument(message, null, visibilityExtender);
return messageExecutor.apply(arguments);
}
);
}
} else {
final Consumer<Object[]> messageExecutor = arguments -> {
try {
messageConsumerMethod.invoke(messageConsumerBean, arguments);
} catch (IllegalAccessException illegalAccessException) {
throw new MessageProcessingException(illegalAccessException);
} catch (InvocationTargetException exception) {
throw new MessageProcessingException(exception.getCause());
}
};
if (hasAcknowledgeParameter) {
this.delegate =
new LambdaMessageProcessor(
sqsAsyncClient,
queueProperties,
(message, acknowledge, visibilityExtender) -> {
final Object[] arguments = argumentResolvers.resolveArgument(message, acknowledge, visibilityExtender);
messageExecutor.accept(arguments);
}
);
} else {
this.delegate =
new LambdaMessageProcessor(
sqsAsyncClient,
queueProperties,
false,
(message, visibilityExtender) -> {
final Object[] arguments = argumentResolvers.resolveArgument(message, null, visibilityExtender);
messageExecutor.accept(arguments);
}
);
}
}
}
private static ArgumentResolvers determineArgumentResolvers(
final ArgumentResolverService argumentResolverService,
final QueueProperties queueProperties,
final Method method
) {
final Parameter[] parameters = method.getParameters();
List<InternalArgumentResolver> argumentResolvers = IntStream
.range(0, parameters.length)
.<InternalArgumentResolver>mapToObj(parameterIndex -> {
final Parameter parameter = parameters[parameterIndex];
final MethodParameter methodParameter = DefaultMethodParameter
.builder()
.method(method)
.parameter(parameter)
.parameterIndex(parameterIndex)
.build();
if (isAcknowledgeParameter(parameter)) {
return (message, acknowledge, visibilityExtender) -> acknowledge;
}
if (isVisibilityExtenderParameter(parameter)) {
return (message, acknowledge, visibilityExtender) -> visibilityExtender;
}
final ArgumentResolver<?> argumentResolver = argumentResolverService.getArgumentResolver(methodParameter);
return (message, acknowledge, visibilityExtender) ->
argumentResolver.resolveArgumentForParameter(queueProperties, methodParameter, message);
})
.collect(toList());
return (message, acknowledge, visibilityExtender) ->
argumentResolvers
.stream()
.map(argumentResolver -> argumentResolver.resolveArgument(message, acknowledge, visibilityExtender))
.toArray(Object[]::new);
}
private static boolean hasAcknowledgeParameter(final Method method) {
return Arrays.stream(method.getParameters()).anyMatch(CoreMessageProcessor::isAcknowledgeParameter);
}
private static boolean isAcknowledgeParameter(final Parameter parameter) {
return Acknowledge.class.isAssignableFrom(parameter.getType());
}
private static boolean isVisibilityExtenderParameter(final Parameter parameter) {
return VisibilityExtender.class.isAssignableFrom(parameter.getType());
}
@Override
public CompletableFuture<?> processMessage(final Message message, final Supplier<CompletableFuture<?>> resolveMessageCallback) {
return delegate.processMessage(message, resolveMessageCallback);
}
/**
* Internal resolver for resolving the argument given the message.
*/
@FunctionalInterface
interface InternalArgumentResolver {
Object resolveArgument(
final Message message,
@Nullable final Acknowledge acknowledge,
@Nullable final VisibilityExtender visibilityExtender
);
}
/**
* Resolve all of the arguments for this message.
*/
@FunctionalInterface
interface ArgumentResolvers {
Object[] resolveArgument(
final Message message,
@Nullable final Acknowledge acknowledge,
@Nullable final VisibilityExtender visibilityExtender
);
}
}