org.axonframework.messaging

Class GenericResultMessage<R>

java.lang.Object

org.axonframework.messaging.MessageDecorator<R>

org.axonframework.messaging.GenericResultMessage<R>

All Implemented Interfaces:

Serializable, Message<R>, ResultMessage<R>

Direct Known Subclasses:

GenericCommandResultMessage, GenericQueryResponseMessage, GenericSubscriptionQueryUpdateMessage

public class GenericResultMessage<R>
extends MessageDecorator<R>
implements ResultMessage<R>

Generic implementation of ResultMessage.

Since:

4.0

Author:

Milan Savic

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
GenericResultMessage(Message<R> delegate) Creates a new ResultMessage with given delegate message.
GenericResultMessage(Message<R> delegate, Throwable exception) Creates a ResultMessage with given delegate message and exception.
GenericResultMessage(R result) Creates a ResultMessage with the given result as the payload.
GenericResultMessage(R result, Map<String,?> metaData) Creates a ResultMessage with the given result as the payload and metaData as the meta data.
GenericResultMessage(Throwable exception) Creates a ResultMessage with the given exception.
GenericResultMessage(Throwable exception, Map<String,?> metaData) Creates a ResultMessage with the given exception and metaData.

Method Summary

Modifier and Type	Method and Description
GenericResultMessage<R>	andMetaData(Map<String,?> metaData) Returns a copy of this Message with it MetaData merged with the given metaData.
static <T> ResultMessage<T>	asResultMessage(Object result) Returns the given result as a ResultMessage instance.
static <T> ResultMessage<T>	asResultMessage(Throwable exception) Creates a ResultMessage with the given exception result.
protected void	describeTo(StringBuilder stringBuilder) Describe the message specific properties to the given stringBuilder.
protected String	describeType() Describe the type of message, used in MessageDecorator.toString().
R	getPayload() Returns the payload of this message.
boolean	isExceptional() Indicates whether the ResultMessage represents unsuccessful execution.
Optional<Throwable>	optionalExceptionResult() Returns the Exception in case of exceptional result message or an empty Optional in case of successful execution.
<S> SerializedObject<S>	serializePayload(Serializer serializer, Class<S> expectedRepresentation) Serialize the payload of this message to the expectedRepresentation using given serializer.
GenericResultMessage<R>	withMetaData(Map<String,?> metaData) Returns a copy of this Message with the given metaData.

Methods inherited from class org.axonframework.messaging.MessageDecorator

getDelegate, getIdentifier, getMetaData, getPayloadType, serializeMetaData, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.axonframework.messaging.ResultMessage

exceptionDetails, exceptionResult, serializeExceptionResult

Methods inherited from interface org.axonframework.messaging.Message

getIdentifier, getMetaData, getPayloadType, serializeMetaData

Constructor Detail

GenericResultMessage

public GenericResultMessage(R result)

Creates a ResultMessage with the given result as the payload.

Parameters:

result - the payload for the Message

GenericResultMessage

public GenericResultMessage(Throwable exception)

Creates a ResultMessage with the given exception.

Parameters:

exception - the Exception describing the cause of an error

GenericResultMessage

public GenericResultMessage(R result,
                            Map<String,?> metaData)

Creates a ResultMessage with the given result as the payload and metaData as the meta data.

Parameters:

result - the payload for the Message

metaData - the meta data for the Message

GenericResultMessage

public GenericResultMessage(Throwable exception,
                            Map<String,?> metaData)

Creates a ResultMessage with the given exception and metaData.

Parameters:

exception - the Exception describing the cause of an error

metaData - the meta data for the Message

GenericResultMessage

public GenericResultMessage(Message<R> delegate)

Creates a new ResultMessage with given delegate message.

Parameters:

delegate - the message delegate

GenericResultMessage

public GenericResultMessage(Message<R> delegate,
                            Throwable exception)

Creates a ResultMessage with given delegate message and exception.

Parameters:

delegate - the Message delegate

exception - the Exception describing the cause of an error

Method Detail

asResultMessage

public static <T> ResultMessage<T> asResultMessage(Object result)

Returns the given result as a ResultMessage instance. If result already implements ResultMessage, it is returned as-is. If result implements Message, payload and meta data will be used to construct new GenericResultMessage. Otherwise, the given result is wrapped into a GenericResultMessage as its payload.

Type Parameters:

T - The type of the payload contained in returned Message

Parameters:

result - the command result to be wrapped as ResultMessage

Returns:

a Message containing given result as payload, or result if already implements ResultMessage

asResultMessage

public static <T> ResultMessage<T> asResultMessage(Throwable exception)

Creates a ResultMessage with the given exception result.

Type Parameters:

T - the type of payload

Parameters:

exception - the Exception describing the cause of an error

Returns:

a message containing exception result

isExceptional

public boolean isExceptional()

Description copied from interface: ResultMessage

Indicates whether the ResultMessage represents unsuccessful execution.

Specified by:

isExceptional in interface ResultMessage<R>

Returns:

true if execution was unsuccessful, false otherwise

optionalExceptionResult

public Optional<Throwable> optionalExceptionResult()

Description copied from interface: ResultMessage

Returns the Exception in case of exceptional result message or an empty Optional in case of successful execution.

Specified by:

optionalExceptionResult in interface ResultMessage<R>

Returns:

an Optional containing exception result or an empty Optional in case of a successful execution

serializePayload

public <S> SerializedObject<S> serializePayload(Serializer serializer,
                                                Class<S> expectedRepresentation)

Description copied from interface: Message

Serialize the payload of this message to the expectedRepresentation using given serializer. This method should return the same SerializedObject instance when invoked multiple times using the same serializer.

Specified by:

serializePayload in interface Message<R>

Specified by:

serializePayload in interface ResultMessage<R>

Overrides:

serializePayload in class MessageDecorator<R>

Type Parameters:

S - The type of the serialized data

Parameters:

serializer - The serializer to serialize payload with

expectedRepresentation - The type of data to serialize to

Returns:

a SerializedObject containing the serialized representation of the message's payload

withMetaData

public GenericResultMessage<R> withMetaData(Map<String,?> metaData)

Description copied from interface: Message

Returns a copy of this Message with the given metaData. The payload remains unchanged.

While the implementation returned may be different than the implementation of this, implementations must take special care in returning the same type of Message (e.g. EventMessage, DomainEventMessage) to prevent errors further downstream.

Specified by:

withMetaData in interface Message<R>

Specified by:

withMetaData in interface ResultMessage<R>

Parameters:

metaData - The new MetaData for the Message

Returns:

a copy of this message with the given MetaData

andMetaData

public GenericResultMessage<R> andMetaData(Map<String,?> metaData)

Description copied from interface: Message

Returns a copy of this Message with it MetaData merged with the given metaData. The payload remains unchanged.

Specified by:

andMetaData in interface Message<R>

Specified by:

andMetaData in interface ResultMessage<R>

Parameters:

metaData - The MetaData to merge with

Returns:

a copy of this message with the given MetaData

describeTo

protected void describeTo(StringBuilder stringBuilder)

Description copied from class: MessageDecorator

Describe the message specific properties to the given stringBuilder. Subclasses should override this method, calling the super method and appending their own properties to the end (or beginning).

As convention, String values should be enclosed in single quotes, Objects in curly brackets and numeric values may be appended without enclosing. All properties should be preceded by a comma when appending, or finish with a comma when prefixing values.

Overrides:

describeTo in class MessageDecorator<R>

Parameters:

stringBuilder - the builder to append data to

describeType

protected String describeType()

Description copied from class: MessageDecorator

Describe the type of message, used in MessageDecorator.toString().

Defaults to the simple class name of the actual instance.

Overrides:

describeType in class MessageDecorator<R>

Returns:

the type of message

getPayload

public R getPayload()

Description copied from interface: Message

Returns the payload of this message. The payload is the application-specific information.

Specified by:

getPayload in interface Message<R>

Overrides:

getPayload in class MessageDecorator<R>

Returns:

the payload of this message