org.axonframework.eventhandling.io
Class EventMessageReader

java.lang.Object
  org.axonframework.eventhandling.io.EventMessageReader

public class EventMessageReader
extends Object

Reader that reads EventMessage instances written to the underlying input. Typically, these messages have been written using a EventMessageWriter. This reader distinguishes between DomainEventMessage and regular EventMessage implementations and will reconstruct an instance implementing that same interface when reading.

Since:

2.0

Author:

Allard Buijze

Constructor Summary

EventMessageReader(DataInputStream input, Serializer serializer)
Creates a new EventMessageReader that reads the data from the given input and deserializes payload and meta data using the given serializer.

Method Summary

<T> EventMessage<T>

readEventMessage() Reads an EventMessage from the underlying input.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EventMessageReader

public EventMessageReader(DataInputStream input,
                          Serializer serializer)

Creates a new EventMessageReader that reads the data from the given input and deserializes payload and meta data using the given serializer.

Parameters:

input - The input providing access to the written data

serializer - The serializer to deserialize payload and meta data with

Method Detail

readEventMessage

public <T> EventMessage<T> readEventMessage()
                                 throws IOException

Reads an EventMessage from the underlying input. If the written event was a DomainEventMessage, an instance of DomainEventMessage is returned.

Type Parameters:

T - The type of payload expected to be in the returned EventMessage. This is not checked at runtime!

Returns:

an EventMessage representing the message originally written, or null if the stream has reached the end

Throws:

IOException - when an error occurs reading from the underlying input

EOFException - when the end of the stream was reached before the message was entirely read

UnknownSerializedTypeException - if the type of the serialized object cannot be resolved to a class