Uses of Interface
org.axonframework.eventhandling.EventMessage
Packages that use EventMessage
Package
Description
Classes related to event handling and dispatching, such as
Event Listeners and the Event Bus.Classes related to message processing in Axon Framework.
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Uses of EventMessage in org.axonframework.deadline
Subinterfaces of EventMessage in org.axonframework.deadlineModifier and TypeInterfaceDescriptioninterfaceRepresents a Message for a Deadline, specified by its deadline name and optionally containing a deadline payload.Classes in org.axonframework.deadline that implement EventMessage -
Uses of EventMessage in org.axonframework.eventhandling
Subinterfaces of EventMessage in org.axonframework.eventhandlingModifier and TypeInterfaceDescriptioninterfaceRepresents a Message that wraps a DomainEvent and an Event representing an important change in the Domain.interfaceRepresents anEventMessagecontaining aTrackingToken.Classes in org.axonframework.eventhandling that implement EventMessageModifier and TypeClassDescriptionclassGeneric implementation of aDomainEventMessage.classGeneric implementation of the EventMessage interface.classGeneric implementation of aDomainEventMessagethat is also aTrackedEventMessage.classGeneric implementation of aTrackedEventMessage.Methods in org.axonframework.eventhandling that return EventMessageModifier and TypeMethodDescriptionEventMessage.andMetaData(Map<String, ?> metaData) Returns a copy of this EventMessage with it MetaData merged with the givenmetaData.static <T> EventMessage<T>GenericEventMessage.asEventMessage(Object event) Returns the given event as an EventMessage.<T> EventMessage<T>DefaultEventBusSpanFactory.propagateContext(EventMessage<T> eventMessage) <T> EventMessage<T>EventBusSpanFactory.propagateContext(EventMessage<T> eventMessage) Propagates the context of the current span to the given event message.EventMessage.withMetaData(Map<String, ?> metaData) Returns a copy of this EventMessage with the givenmetaData.Methods in org.axonframework.eventhandling that return types with arguments of type EventMessageModifier and TypeMethodDescriptionList<? extends EventMessage<?>>ErrorContext.failedEvents()The events part of the batch that failed.List<MessageHandlerInterceptor<? super EventMessage<?>>>AbstractEventProcessor.getHandlerInterceptors()List<MessageHandlerInterceptor<? super EventMessage<?>>>EventProcessor.getHandlerInterceptors()Return the list of already registeredMessageHandlerInterceptors for this event processor.SubscribableMessageSource<? extends EventMessage<?>>SubscribingEventProcessor.getMessageSource()Returns the message source from which this processor receives its eventsSequencingPolicy<? super EventMessage<?>>SimpleEventHandlerInvoker.getSequencingPolicy()Return theSequencingPolicyas configured for thisEventHandlerInvoker.protected List<? extends EventMessage<?>>AbstractEventBus.intercept(List<? extends EventMessage<?>> events) Invokes all the dispatch interceptors.protected List<EventMessage<?>>AbstractEventBus.queuedMessages()Returns a list of all the events staged for publication in this Unit of Work.Methods in org.axonframework.eventhandling with parameters of type EventMessageModifier and TypeMethodDescriptionstatic <T> DomainEventMessage<T>EventUtils.asDomainEventMessage(EventMessage<T> eventMessage) Deprecated.since this method is not used for external use.static <T> TrackedEventMessage<T>EventUtils.asTrackedEventMessage(EventMessage<T> eventMessage, TrackingToken trackingToken) protected booleanAbstractEventProcessor.canHandle(EventMessage<?> eventMessage, Segment segment) Indicates whether the processor can/should handle the giveneventMessagefor the givensegment.booleanAnnotationEventHandlerAdapter.canHandle(EventMessage<?> event) booleanEventHandlerInvoker.canHandle(EventMessage<?> eventMessage, Segment segment) Check whether or not this invoker has handlers that can handle the giveneventMessagefor a givensegment.booleanMultiEventHandlerInvoker.canHandle(EventMessage<?> eventMessage, Segment segment) booleanSimpleEventHandlerInvoker.canHandle(EventMessage<?> eventMessage, Segment segment) protected booleanTrackingEventProcessor.canHandle(EventMessage<?> eventMessage, Collection<Segment> segments) Indicates whether any of the components handling events for this Processor are able to handle the giveneventMessagefor any of the givensegments.DefaultEventProcessorSpanFactory.createProcessEventSpan(boolean streaming, EventMessage<?> eventMessage) EventProcessorSpanFactory.createProcessEventSpan(boolean streaming, EventMessage<?> eventMessage) Creates a span for the handling of an event.DefaultEventBusSpanFactory.createPublishEventSpan(EventMessage<?> eventMessage) EventBusSpanFactory.createPublishEventSpan(EventMessage<?> eventMessage) Creates a span for the publishing of an event.AnnotationEventHandlerAdapter.handle(EventMessage<?> event) voidEventHandlerInvoker.handle(EventMessage<?> message, Segment segment) Handle the givenmessagefor the givensegment.EventMessageHandler.handle(EventMessage<?> event) Process the given event.voidMultiEventHandlerInvoker.handle(EventMessage<?> message, Segment segment) voidSimpleEventHandlerInvoker.handle(EventMessage<?> message, Segment segment) protected voidSimpleEventHandlerInvoker.invokeHandlers(EventMessage<?> message) voidListenerInvocationErrorHandler.onError(Exception exception, EventMessage<?> event, EventMessageHandler eventHandler) Invoked after giveneventListenerfailed to handle givenevent.voidLoggingErrorHandler.onError(Exception exception, EventMessage<?> event, EventMessageHandler eventHandler) voidPropagatingErrorHandler.onError(Exception exception, EventMessage<?> event, EventMessageHandler eventHandler) <T> EventMessage<T>DefaultEventBusSpanFactory.propagateContext(EventMessage<T> eventMessage) <T> EventMessage<T>EventBusSpanFactory.propagateContext(EventMessage<T> eventMessage) Propagates the context of the current span to the given event message.default voidEventBus.publish(EventMessage<?>... events) Publish a collection of events on this bus (one, or multiple).static <T> Optional<T>ReplayToken.replayContext(EventMessage<?> message, Class<T> contextClass) Extracts the context from amessageof the matchingcontextClass.protected voidAbstractEventProcessor.reportIgnored(EventMessage<?> eventMessage) Report the giveneventMessageas ignored.protected ObjectSimpleEventHandlerInvoker.sequenceIdentifier(EventMessage<?> event) protected booleanSimpleEventHandlerInvoker.sequencingPolicyMatchesSegment(EventMessage<?> message, Segment segment) Method parameters in org.axonframework.eventhandling with type arguments of type EventMessageModifier and TypeMethodDescriptionprotected voidAbstractEventBus.afterCommit(List<? extends EventMessage<?>> events) Process giveneventsafter the Unit of Work has been committed.protected voidAbstractEventBus.commit(List<? extends EventMessage<?>> events) Process giveneventswhile the Unit of Work root is being committed.DefaultEventProcessorSpanFactory.createBatchSpan(boolean streaming, List<? extends EventMessage<?>> eventMessages) EventProcessorSpanFactory.createBatchSpan(boolean streaming, List<? extends EventMessage<?>> eventMessages) Creates a span for the batch of events that are handled by the event processor.voidDirectEventProcessingStrategy.handle(List<? extends EventMessage<?>> events, Consumer<List<? extends EventMessage<?>>> processor) voidDirectEventProcessingStrategy.handle(List<? extends EventMessage<?>> events, Consumer<List<? extends EventMessage<?>>> processor) voidEventProcessingStrategy.handle(List<? extends EventMessage<?>> events, Consumer<List<? extends EventMessage<?>>> processor) Handle the given batch ofevents.voidEventProcessingStrategy.handle(List<? extends EventMessage<?>> events, Consumer<List<? extends EventMessage<?>>> processor) Handle the given batch ofevents.protected List<? extends EventMessage<?>>AbstractEventBus.intercept(List<? extends EventMessage<?>> events) Invokes all the dispatch interceptors.AbstractEventBus.Builder.messageMonitor(MessageMonitor<? super EventMessage<?>> messageMonitor) Sets theMessageMonitorto monitor ingestedEventMessages.AbstractEventProcessor.Builder.messageMonitor(MessageMonitor<? super EventMessage<?>> messageMonitor) Sets theMessageMonitorto monitorEventMessages before and after they're processed.SimpleEventBus.Builder.messageMonitor(MessageMonitor<? super EventMessage<?>> messageMonitor) SubscribingEventProcessor.Builder.messageMonitor(MessageMonitor<? super EventMessage<?>> messageMonitor) TrackingEventProcessor.Builder.messageMonitor(MessageMonitor<? super EventMessage<?>> messageMonitor) SubscribingEventProcessor.Builder.messageSource(SubscribableMessageSource<? extends EventMessage<?>> messageSource) Sets theSubscribableMessageSource(e.g. theEventBus) to which thisEventProcessorimplementation will subscribe itself to receiveEventMessages.protected voidAbstractEventBus.prepareCommit(List<? extends EventMessage<?>> events) Process giveneventswhile the Unit of Work root is preparing for commit.protected voidSubscribingEventProcessor.process(List<? extends EventMessage<?>> eventMessages) Process the given messages.protected final voidAbstractEventProcessor.processInUnitOfWork(List<? extends EventMessage<?>> eventMessages, UnitOfWork<? extends EventMessage<?>> unitOfWork) Process a batch of events.protected final voidAbstractEventProcessor.processInUnitOfWork(List<? extends EventMessage<?>> eventMessages, UnitOfWork<? extends EventMessage<?>> unitOfWork) Process a batch of events.protected voidAbstractEventProcessor.processInUnitOfWork(List<? extends EventMessage<?>> eventMessages, UnitOfWork<? extends EventMessage<?>> unitOfWork, Collection<Segment> processingSegments) Process a batch of events.protected voidAbstractEventProcessor.processInUnitOfWork(List<? extends EventMessage<?>> eventMessages, UnitOfWork<? extends EventMessage<?>> unitOfWork, Collection<Segment> processingSegments) Process a batch of events.voidAbstractEventBus.publish(List<? extends EventMessage<?>> events) voidEventBus.publish(List<? extends EventMessage<?>> events) Publish a collection of events on this bus (one, or multiple).AbstractEventBus.registerDispatchInterceptor(MessageDispatchInterceptor<? super EventMessage<?>> dispatchInterceptor) Register the given DispatchInterceptor.AbstractEventProcessor.registerHandlerInterceptor(MessageHandlerInterceptor<? super EventMessage<?>> interceptor) SimpleEventHandlerInvoker.Builder.sequencingPolicy(SequencingPolicy<? super EventMessage<?>> sequencingPolicy) Sets theSequencingPolicyin charge of deciding whether a given event should be handled (throughEventHandlerInvoker.handle(EventMessage, Segment)) by the givenSegment.AbstractEventBus.subscribe(Consumer<List<? extends EventMessage<?>>> eventProcessor) Constructors in org.axonframework.eventhandling with parameters of type EventMessageModifierConstructorDescriptionAbstractEventEntry(EventMessage<?> eventMessage, Serializer serializer, Class<T> contentType) Construct a new event entry from a published event message to enable storing the event or sending it to a remote location.GenericTrackedEventMessage(TrackingToken trackingToken, EventMessage<T> delegate) Creates a GenericTrackedEventMessage with giventrackingTokenand delegate event message.Constructor parameters in org.axonframework.eventhandling with type arguments of type EventMessageModifierConstructorDescriptionErrorContext(String eventProcessor, Throwable error, List<? extends EventMessage<?>> failedEvents) Instantiate an ErrorContext for the giveneventProcessor, due to the givenerror, with the givenfailedEvents. -
Uses of EventMessage in org.axonframework.eventhandling.async
Methods in org.axonframework.eventhandling.async with parameters of type EventMessageModifier and TypeMethodDescriptionFullConcurrencyPolicy.getSequenceIdentifierFor(EventMessage<?> event) MetaDataSequencingPolicy.getSequenceIdentifierFor(EventMessage<?> event) PropertySequencingPolicy.getSequenceIdentifierFor(EventMessage eventMessage) SequentialPerAggregatePolicy.getSequenceIdentifierFor(EventMessage event) Method parameters in org.axonframework.eventhandling.async with type arguments of type EventMessageModifier and TypeMethodDescriptionPropertySequencingPolicy.Builder.fallbackSequencingPolicy(SequencingPolicy<EventMessage> fallbackSequencingPolicy) Defines the fallback sequencing policy, the sequencing policy which is applied if the event message payload is not of a supported type.voidAsynchronousEventProcessingStrategy.handle(List<? extends EventMessage<?>> events, Consumer<List<? extends EventMessage<?>>> processor) voidAsynchronousEventProcessingStrategy.handle(List<? extends EventMessage<?>> events, Consumer<List<? extends EventMessage<?>>> processor) protected voidAsynchronousEventProcessingStrategy.schedule(List<? extends EventMessage<?>> events, Consumer<List<? extends EventMessage<?>>> processor) Schedules this task for execution when all pre-conditions have been met.protected voidAsynchronousEventProcessingStrategy.schedule(List<? extends EventMessage<?>> events, Consumer<List<? extends EventMessage<?>>> processor) Schedules this task for execution when all pre-conditions have been met.booleanEventProcessorTask.scheduleEvents(List<? extends EventMessage<?>> events, Consumer<List<? extends EventMessage<?>>> processor) Schedules a batch of events for processing.booleanEventProcessorTask.scheduleEvents(List<? extends EventMessage<?>> events, Consumer<List<? extends EventMessage<?>>> processor) Schedules a batch of events for processing.Constructor parameters in org.axonframework.eventhandling.async with type arguments of type EventMessageModifierConstructorDescriptionAsynchronousEventProcessingStrategy(Executor executor, SequencingPolicy<? super EventMessage<?>> sequencingPolicy) Initializes a newAsynchronousEventProcessingStrategythat uses the givenexecutorto execute event processing tasks andsequencingPolicythat determines if an event may be processed in sequence or in parallel. -
Uses of EventMessage in org.axonframework.eventhandling.deadletter
Methods in org.axonframework.eventhandling.deadletter with parameters of type EventMessageModifier and TypeMethodDescriptionvoidDeadLetteringEventHandlerInvoker.handle(EventMessage<?> message, Segment segment) Method parameters in org.axonframework.eventhandling.deadletter with type arguments of type EventMessageModifier and TypeMethodDescriptionDeadLetteringEventHandlerInvoker.Builder.enqueuePolicy(EnqueuePolicy<EventMessage<?>> enqueuePolicy) Sets theEnqueuePolicythisEventHandlerInvokeruses to decide whether adead lettershould be added to theSequencedDeadLetterQueue.booleanDeadLetteringEventHandlerInvoker.process(Predicate<DeadLetter<? extends EventMessage<?>>> sequenceFilter) DeadLetteringEventHandlerInvoker.Builder.queue(SequencedDeadLetterQueue<EventMessage<?>> queue) Sets theSequencedDeadLetterQueuethisEventHandlerInvokermaintains dead letters with.DeadLetteringEventHandlerInvoker.registerHandlerInterceptor(MessageHandlerInterceptor<? super EventMessage<?>> interceptor) -
Uses of EventMessage in org.axonframework.eventhandling.deadletter.jdbc
Classes in org.axonframework.eventhandling.deadletter.jdbc with type parameters of type EventMessageModifier and TypeInterfaceDescriptioninterfaceDeadLetterJdbcConverter<E extends EventMessage<?>,D extends JdbcDeadLetter<E>> A functional interface describing how to convert aResultSetinJdbcDeadLetterimplementation of typeDinterfaceDeadLetterStatementFactory<E extends EventMessage<?>>A contract towards allPreparedStatementsaJdbcSequencedDeadLetterQueuerequires to function.classDefaultDeadLetterJdbcConverter<E extends EventMessage<?>>Default implementation of theDeadLetterJdbcConverter, convertingResultSetsintoJdbcDeadLetterinstances.protected static classDefaultDeadLetterJdbcConverter.Builder<E extends EventMessage<?>>Builder class to instantiate aDefaultDeadLetterJdbcConverter.classDefaultDeadLetterStatementFactory<E extends EventMessage<?>>Default implementation of theDeadLetterStatementFactoryused by theJdbcSequencedDeadLetterQueueConstructsPreparedStatementsthat are compatible with most databases.protected static classDefaultDeadLetterStatementFactory.Builder<E extends EventMessage<?>>Builder class to instantiate aDefaultDeadLetterStatementFactory.classJdbcDeadLetter<E extends EventMessage<?>>ADeadLetterthat was saved to a JDBC-backed database and reconstructed from it.classJdbcSequencedDeadLetterQueue<E extends EventMessage<?>>A JDBC-based implementation of theSequencedDeadLetterQueue, used for storing dead letters containingevent messagesdurably.static classJdbcSequencedDeadLetterQueue.Builder<E extends EventMessage<?>>Builder class to instantiate anJdbcSequencedDeadLetterQueue.Methods in org.axonframework.eventhandling.deadletter.jdbc with type parameters of type EventMessageModifier and TypeMethodDescriptionstatic <E extends EventMessage<?>>
DefaultDeadLetterJdbcConverter.Builder<E>DefaultDeadLetterJdbcConverter.builder()Instantiate a builder to construct aDefaultDeadLetterJdbcConverter.static <E extends EventMessage<?>>
DefaultDeadLetterStatementFactory.Builder<E>DefaultDeadLetterStatementFactory.builder()Instantiate a builder to construct aDefaultDeadLetterStatementFactory.static <E extends EventMessage<?>>
JdbcSequencedDeadLetterQueue.Builder<E>JdbcSequencedDeadLetterQueue.builder()Instantiate a builder to construct aJdbcSequencedDeadLetterQueue. -
Uses of EventMessage in org.axonframework.eventhandling.deadletter.jpa
Classes in org.axonframework.eventhandling.deadletter.jpa with type parameters of type EventMessageModifier and TypeInterfaceDescriptioninterfaceDeadLetterJpaConverter<M extends EventMessage<?>>Converter that can convert aEventMessageto aDeadLetterEventEntryand vice versa.classJpaDeadLetter<M extends EventMessage<?>>ADeadLetterthat was saved to the database and reconstructed from it.classJpaSequencedDeadLetterQueue<M extends EventMessage<?>>JPA-backed implementation of theSequencedDeadLetterQueue, used for storing dead letters containingEventmessagesdurably as aDeadLetterEntry.static classJpaSequencedDeadLetterQueue.Builder<T extends EventMessage<?>>Builder class to instantiate anJpaSequencedDeadLetterQueue.Methods in org.axonframework.eventhandling.deadletter.jpa with type parameters of type EventMessageModifier and TypeMethodDescriptionstatic <M extends EventMessage<?>>
JpaSequencedDeadLetterQueue.Builder<M>JpaSequencedDeadLetterQueue.builder()Creates a new builder, capable of building aJpaSequencedDeadLetterQueueaccording to the provided configuration.Methods in org.axonframework.eventhandling.deadletter.jpa that return EventMessageModifier and TypeMethodDescriptionEventMessage<?>EventMessageDeadLetterJpaConverter.convert(DeadLetterEventEntry entry, Serializer eventSerializer, Serializer genericSerializer) Methods in org.axonframework.eventhandling.deadletter.jpa with parameters of type EventMessageModifier and TypeMethodDescriptionbooleanEventMessageDeadLetterJpaConverter.canConvert(EventMessage<?> message) EventMessageDeadLetterJpaConverter.convert(EventMessage<?> message, Serializer eventSerializer, Serializer genericSerializer) Method parameters in org.axonframework.eventhandling.deadletter.jpa with type arguments of type EventMessageModifier and TypeMethodDescriptionJpaSequencedDeadLetterQueue.Builder.addConverter(DeadLetterJpaConverter<EventMessage<?>> converter) Adds aDeadLetterJpaConverterto the configuration, which is used to deserialize dead-letter entries from the database. -
Uses of EventMessage in org.axonframework.eventhandling.deadletter.legacyjpa
Classes in org.axonframework.eventhandling.deadletter.legacyjpa with type parameters of type EventMessageModifier and TypeInterfaceDescriptioninterfaceDeadLetterJpaConverter<M extends EventMessage<?>>Deprecated.in favor of usingDeadLetterJpaConverterwhich moved to jakarta.classJpaDeadLetter<M extends EventMessage<?>>Deprecated.in favor of usingJpaDeadLetterwhich moved to jakarta.classJpaSequencedDeadLetterQueue<M extends EventMessage<?>>Deprecated.in favor of usingJpaSequencedDeadLetterQueuewhich moved to jakarta.static classJpaSequencedDeadLetterQueue.Builder<T extends EventMessage<?>>Deprecated.Builder class to instantiate anJpaSequencedDeadLetterQueue.Methods in org.axonframework.eventhandling.deadletter.legacyjpa with type parameters of type EventMessageModifier and TypeMethodDescriptionstatic <M extends EventMessage<?>>
JpaSequencedDeadLetterQueue.Builder<M>JpaSequencedDeadLetterQueue.builder()Deprecated.Creates a new builder, capable of building aJpaSequencedDeadLetterQueueaccording to the provided configuration.Methods in org.axonframework.eventhandling.deadletter.legacyjpa that return EventMessageModifier and TypeMethodDescriptionEventMessage<?>EventMessageDeadLetterJpaConverter.convert(DeadLetterEventEntry entry, Serializer eventSerializer, Serializer genericSerializer) Deprecated.Methods in org.axonframework.eventhandling.deadletter.legacyjpa with parameters of type EventMessageModifier and TypeMethodDescriptionbooleanEventMessageDeadLetterJpaConverter.canConvert(EventMessage<?> message) Deprecated.EventMessageDeadLetterJpaConverter.convert(EventMessage<?> message, Serializer eventSerializer, Serializer genericSerializer) Deprecated.Method parameters in org.axonframework.eventhandling.deadletter.legacyjpa with type arguments of type EventMessageModifier and TypeMethodDescriptionJpaSequencedDeadLetterQueue.Builder.addConverter(DeadLetterJpaConverter<EventMessage<?>> converter) Adds aDeadLetterJpaConverterto the configuration, which is used to deserialize dead-letter entries from the database. -
Uses of EventMessage in org.axonframework.eventhandling.gateway
Methods in org.axonframework.eventhandling.gateway that return EventMessageModifier and TypeMethodDescriptionprotected <E> EventMessage<E>AbstractEventGateway.processInterceptors(EventMessage<E> eventMessage) Invokes all the dispatch interceptors and returns the EventMessage instance that should be dispatched.Methods in org.axonframework.eventhandling.gateway with parameters of type EventMessageModifier and TypeMethodDescriptionprotected <E> EventMessage<E>AbstractEventGateway.processInterceptors(EventMessage<E> eventMessage) Invokes all the dispatch interceptors and returns the EventMessage instance that should be dispatched.Method parameters in org.axonframework.eventhandling.gateway with type arguments of type EventMessageModifier and TypeMethodDescriptionAbstractEventGateway.Builder.dispatchInterceptors(List<MessageDispatchInterceptor<? super EventMessage<?>>> dispatchInterceptors) DefaultEventGateway.Builder.dispatchInterceptors(List<MessageDispatchInterceptor<? super EventMessage<?>>> dispatchInterceptors) AbstractEventGateway.registerDispatchInterceptor(MessageDispatchInterceptor<? super EventMessage<?>> interceptor) Registers an event dispatch interceptor within anEventGateway. -
Uses of EventMessage in org.axonframework.eventhandling.interceptors
Methods in org.axonframework.eventhandling.interceptors that return types with arguments of type EventMessageModifier and TypeMethodDescriptionEventLoggingInterceptor.handle(List<? extends EventMessage<?>> messages) EventLoggingInterceptor.handle(List<? extends EventMessage<?>> messages) Method parameters in org.axonframework.eventhandling.interceptors with type arguments of type EventMessageModifier and TypeMethodDescriptionEventLoggingInterceptor.handle(List<? extends EventMessage<?>> messages) -
Uses of EventMessage in org.axonframework.eventhandling.pooled
Method parameters in org.axonframework.eventhandling.pooled with type arguments of type EventMessageModifier and TypeMethodDescriptionPooledStreamingEventProcessor.Builder.messageMonitor(MessageMonitor<? super EventMessage<?>> messageMonitor) -
Uses of EventMessage in org.axonframework.eventhandling.scheduling.quartz
Methods in org.axonframework.eventhandling.scheduling.quartz with parameters of type EventMessageModifier and TypeMethodDescriptionprotected org.quartz.JobDetailQuartzEventScheduler.buildJobDetail(EventMessage event, org.quartz.JobKey jobKey) Builds the JobDetail instance for Quartz, which defines the Job that needs to be executed when the trigger fires. -
Uses of EventMessage in org.axonframework.messaging
Methods in org.axonframework.messaging with parameters of type EventMessageModifier and TypeMethodDescriptionHeaders.defaultHeaders(EventMessage<?> message, SerializedObject<?> serializedObject) Generate defaults headers to recognise an event message.