Module org.fuin.ddd4j

Package org.fuin.ddd4j.ddd

Interface Repository<ID extends AggregateRootId,T extends AggregateRoot<ID>>

Type Parameters:

ID - Type of the aggregate root identifier.

T - Type of the aggregate.

All Known Implementing Classes:

EventStoreRepository

public interface Repository<ID extends AggregateRootId,T extends AggregateRoot<ID>>

Repository that supports CRUD operations for an aggregate.

Method Summary

Modifier and Type	Method	Description
void	add(T aggregate)	Adds a new aggregate to the repository without any meta data.
void	add(T aggregate, String metaType, Object metaData)	Adds a new aggregate to the repository with some meta data.
T	create()	Factory method to create a new aggregate.
void	delete(ID aggregateId, int expectedVersion)	Deletes an aggregate from the repository.
@NotNull Class<T>	getAggregateClass()	Returns the class of the aggregate in the repository.
@NotNull EntityType	getAggregateType()	Returns a unique name for the aggregate root type.
T	read(ID id)	Reads the latest version of an aggregate.
T	read(ID id, int version)	Reads a given version of an aggregate.
void	update(T aggregate)	Saves the changes on an aggregate in the repository without any meta data.
void	update(T aggregate, String metaType, Object metaData)	Saves the changes on an aggregate in the repository including some meta data.

Method Details

getAggregateClass

@NotNull
@NotNull Class<T> getAggregateClass()

Returns the class of the aggregate in the repository.

Returns:

Aggregate class.

getAggregateType

@NotNull
@NotNull EntityType getAggregateType()

Returns a unique name for the aggregate root type. This can be used to provide a shorted name for an aggregate type. Another good choice may be the FQN of the getAggregateClass() class.

Returns:

Name of the type of the aggregate.

create

@NotNull
T create()

Factory method to create a new aggregate. Just creates a new instance without doing anything else. The aggregate identifier will NOT be set.

Returns:

New aggregate instance that is NOT persisted. Use the update(AggregateRoot, String, Object) method to persist this new aggregate.

read

@NotNull
T read(@NotNull
 ID id)
throws AggregateNotFoundException,
AggregateDeletedException

Reads the latest version of an aggregate.

Parameters:

id - Unique aggregate identifier.

Returns:

Aggregate.

Throws:

AggregateNotFoundException - An aggregate with the given identifier was not found.

AggregateDeletedException - The aggregate with the given identifier was already deleted.

read

@NotNull
T read(@NotNull
 ID id,
 int version)
throws AggregateNotFoundException,
AggregateDeletedException,
AggregateVersionNotFoundException

Reads a given version of an aggregate.

Parameters:

id - Unique aggregate identifier.

version - Version to read.

Returns:

Aggregate.

Throws:

AggregateNotFoundException - An aggregate with the given identifier was not found.

AggregateDeletedException - The aggregate with the given identifier was already deleted.

AggregateVersionNotFoundException - An aggregate with the requested version does not exist.

update

void update(@NotNull
 T aggregate,
 @Nullable
 String metaType,
 @Nullable
 Object metaData)
     throws AggregateVersionConflictException,
AggregateNotFoundException,
AggregateDeletedException

Saves the changes on an aggregate in the repository including some meta data.

Parameters:

aggregate - Aggregate to store.

metaType - Optional unique name that identifies the type of meta data.

metaData - Optional information that is not directly available in the event.

Throws:

AggregateVersionConflictException - The expected version didn't match the actual version.

AggregateDeletedException - The aggregate with the given identifier was already deleted.

AggregateNotFoundException - An aggregate with the given identifier was not found.

add

void add(@NotNull
 T aggregate)
  throws AggregateAlreadyExistsException,
AggregateDeletedException

Adds a new aggregate to the repository without any meta data. The method will fail if an aggregate with the same ID already exists.

Parameters:

aggregate - Aggregate to add.

Throws:

AggregateAlreadyExistsException - The aggregate with the given version could not be created because it already exists.

AggregateDeletedException - The aggregate with the given identifier was already deleted.

add

void add(@NotNull
 T aggregate,
 @Nullable
 String metaType,
 @Nullable
 Object metaData)
  throws AggregateAlreadyExistsException,
AggregateDeletedException

Adds a new aggregate to the repository with some meta data. The method will fail if an aggregate with the same ID already exists.

Parameters:

aggregate - Aggregate to add.

metaType - Optional unique name that identifies the type of meta data.

metaData - Optional information that is not directly available in the event.

Throws:

AggregateAlreadyExistsException - The aggregate with the given version could not be created because it already exists.

AggregateDeletedException - The aggregate with the given identifier was already deleted.

update

void update(@NotNull
 T aggregate)
     throws AggregateVersionConflictException,
AggregateNotFoundException,
AggregateDeletedException

Saves the changes on an aggregate in the repository without any meta data.

Parameters:

aggregate - Aggregate to store.

Throws:

AggregateVersionConflictException - The expected version didn't match the actual version.

AggregateDeletedException - The aggregate with the given identifier was already deleted.

AggregateNotFoundException - An aggregate with the given identifier was not found.

delete

void delete(@NotNull
 ID aggregateId,
 int expectedVersion)
     throws AggregateVersionConflictException

Deletes an aggregate from the repository. If the aggregate was already deleted, the method will do nothing.

Parameters:

aggregateId - Identifier of the aggregate to delete.

expectedVersion - Expected (current) version of the aggregate.

Throws:

AggregateVersionConflictException - The expected version didn't match the actual version.