org.axonframework.modelling.command

Class AggregateLifecycle

java.lang.Object

org.axonframework.messaging.Scope

org.axonframework.modelling.command.AggregateLifecycle

Direct Known Subclasses:

AnnotatedAggregate, StubAggregateLifecycle

public abstract class AggregateLifecycle
extends Scope

Abstract base class of a component that models an aggregate's life cycle.

Constructor Summary

Constructors

Constructor and Description
AggregateLifecycle()

Method Summary

Modifier and Type	Method and Description
static ApplyMore	apply(Object payload) Apply a DomainEventMessage with given payload without metadata (though interceptors can also be used to provide metadata).
static ApplyMore	apply(Object payload, MetaData metaData) Apply a DomainEventMessage with given payload and metadata (metadata from interceptors will be combined with the provided metadata).
static <T> Aggregate<T>	createNew(Class<T> aggregateType, Callable<T> factoryMethod) Creates a new aggregate instance.
ScopeDescriptor	describeScope() Provide a description of this Scope.
protected abstract <T> ApplyMore	doApply(T payload, MetaData metaData) Apply a DomainEventMessage with given payload and metadata (metadata from interceptors will be combined with the provided metadata).
protected abstract <T> Aggregate<T>	doCreateNew(Class<T> aggregateType, Callable<T> factoryMethod) Creates a new aggregate instance.
protected abstract void	doMarkDeleted() Marks this aggregate as deleted.
protected void	execute(Runnable task) Executes the given task.
protected static AggregateLifecycle	getInstance() Get the current AggregateLifecycle instance for the current thread.
protected abstract boolean	getIsLive() Indicates whether this Aggregate instance is 'live'.
static Long	getVersion() Gets the version of the aggregate.
protected abstract Object	identifier() Retrieve a Object denoting the identifier of this Aggregate.
static boolean	isLive() Indicates whether this Aggregate instance is 'live'.
static void	markDeleted() Marks this aggregate as deleted, instructing a repository to remove that aggregate at an appropriate time.
protected abstract String	type() Retrieve a String denoting the type of this Aggregate.
protected abstract Long	version() Gets the version of the aggregate.

Methods inherited from class org.axonframework.messaging.Scope

describeCurrentScope, endScope, executeWithResult, getCurrentScope, startScope

Methods inherited from class java.lang.Object

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

Constructor Detail

AggregateLifecycle

public AggregateLifecycle()

Method Detail

apply

public static ApplyMore apply(Object payload,
                              MetaData metaData)

Apply a DomainEventMessage with given payload and metadata (metadata from interceptors will be combined with the provided metadata). Applying events means they are immediately applied (published) to the aggregate and scheduled for publication to other event handlers.

The event is applied on all entities part of this aggregate. If the event is applied from an event handler of the aggregate and additional events need to be applied that depends on state changes brought about by the first event use the returned ApplyMore instance.

Parameters:

payload - the payload of the event to apply

metaData - any meta-data that must be registered with the Event

Returns:

a gizmo to apply additional events after the given event has been processed by the entire aggregate

See Also:

ApplyMore

apply

public static ApplyMore apply(Object payload)

Apply a DomainEventMessage with given payload without metadata (though interceptors can also be used to provide metadata). Applying events means they are immediately applied (published) to the aggregate and scheduled for publication to other event handlers.

The event is applied on all entities part of this aggregate. If the event is applied from an event handler of the aggregate and additional events need to be applied that depends on state changes brought about by the first event use the returned ApplyMore instance.

Parameters:

payload - the payload of the event to apply

Returns:

a gizmo to apply additional events after the given event has been processed by the entire aggregate

See Also:

ApplyMore

createNew

public static <T> Aggregate<T> createNew(Class<T> aggregateType,
                                         Callable<T> factoryMethod)
                                  throws Exception

Creates a new aggregate instance. In order for new aggregate to be created, a Repository should be available to the current aggregate. Repository of an aggregate to be created is exposed to the current aggregate via RepositoryProvider.

Type Parameters:

T - type of new aggregate to be created

Parameters:

aggregateType - type of new aggregate to be created

factoryMethod - factory method which creates new aggregate

Returns:

a new aggregate instance

Throws:

Exception - thrown if something goes wrong during instantiation of new aggregate

isLive

public static boolean isLive()

Indicates whether this Aggregate instance is 'live'. Events applied to a 'live' Aggregate represent events that are currently happening, as opposed to events representing historic decisions used to reconstruct the Aggregate's state.

Returns:

true if the aggregate is 'live', false if the aggregate is initializing state based on historic events

getVersion

public static Long getVersion()

Gets the version of the aggregate.

Returns:

the current version of the aggregate

markDeleted

public static void markDeleted()

Marks this aggregate as deleted, instructing a repository to remove that aggregate at an appropriate time.

Note that different repository implementations may react differently to aggregates marked for deletion. Typically, Event Sourced Repositories will ignore the marking and expect deletion to be provided as part of Event information.

getInstance

protected static AggregateLifecycle getInstance()

Get the current AggregateLifecycle instance for the current thread. If none exists an IllegalStateException is thrown.

Returns:

the thread's current AggregateLifecycle

getIsLive

protected abstract boolean getIsLive()

Indicates whether this Aggregate instance is 'live'. This means events currently applied represent events that are currently happening, as opposed to events representing historic decisions.

Returns:

true if the aggregate is 'live', false if the aggregate is initializing state based on historic events

version

protected abstract Long version()

Gets the version of the aggregate.

Returns:

the current version of the aggregate

doMarkDeleted

protected abstract void doMarkDeleted()

Marks this aggregate as deleted. Implementations may react differently to aggregates marked for deletion. Typically, Event Sourced Repositories will ignore the marking and expect deletion to be provided as part of Event information.

doApply

protected abstract <T> ApplyMore doApply(T payload,
                                         MetaData metaData)

Apply a DomainEventMessage with given payload and metadata (metadata from interceptors will be combined with the provided metadata). The event should be applied to the aggregate immediately and scheduled for publication to other event handlers.

The event should be applied on all entities part of this aggregate. If the event is applied from an event handler of the aggregate and additional events need to be applied that depends on state changes brought about by the first event the returned ApplyMore instance should allow for additional events to be applied after this event.

Parameters:

payload - the payload of the event to apply

metaData - any meta-data that must be registered with the Event

Returns:

a gizmo to apply additional events after the given event has been processed by the entire aggregate

See Also:

ApplyMore

doCreateNew

protected abstract <T> Aggregate<T> doCreateNew(Class<T> aggregateType,
                                                Callable<T> factoryMethod)
                                         throws Exception

Creates a new aggregate instance. In order for new aggregate to be created, a Repository should be available to the current aggregate. Repository of an aggregate to be created is exposed to the current aggregate via RepositoryProvider.

Type Parameters:

T - type of new aggregate to be created

Parameters:

aggregateType - type of new aggregate to be created

factoryMethod - factory method which creates new aggregate

Returns:

a new aggregate instance

Throws:

Exception - thrown if something goes wrong during instantiation of new aggregate

execute

protected void execute(Runnable task)

Executes the given task. While the task is being executed the current aggregate will be registered with the current thread as the 'current' aggregate.

Parameters:

task - the task to execute on the aggregate

describeScope

public ScopeDescriptor describeScope()

Description copied from class: Scope

Provide a description of this Scope.

Specified by:

describeScope in class Scope

Returns:

a ScopeDescriptor describing this Scope

type

protected abstract String type()

Retrieve a String denoting the type of this Aggregate.

Returns:

a String denoting the type of this Aggregate

identifier

protected abstract Object identifier()

Retrieve a Object denoting the identifier of this Aggregate.

Returns:

a Object denoting the identifier of this Aggregate