Package org.fuin.ddd4j.esrepo

Class EventStoreRepository<ID extends AggregateRootId,AGGREGATE extends AggregateRoot<ID>>

java.lang.Object

org.fuin.ddd4j.esrepo.EventStoreRepository<ID,AGGREGATE>

Type Parameters:

ID - Type of the aggregate root identifier.

AGGREGATE - Type of the aggregate root.

All Implemented Interfaces:

Repository<ID,AGGREGATE>

public abstract class EventStoreRepository<ID extends AggregateRootId,AGGREGATE extends AggregateRoot<ID>>
extends Object
implements Repository<ID,AGGREGATE>

Event store based repository.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	EventStoreRepository(@NotNull org.fuin.esc.api.EventStore eventStore)	Constructor with all mandatory data.

Method Summary

Modifier and Type	Method	Description
void	add(AGGREGATE aggregate)	Adds a new aggregate to the repository without any meta data.
void	add(AGGREGATE aggregate, String metaType, Object metaData)	Adds a new aggregate to the repository with some meta data.
protected boolean	conflictsResolved(List<DomainEvent<?>> uncommittedChanges, List<DomainEvent<?>> unseenEvents)	Checks if the uncommitted changes conflicts with unseen changes from the event store and tries to solve the problem.
void	delete(ID aggregateId, int expectedVersion)	Deletes an aggregate from the repository.
protected @NotNull AggregateCache<AGGREGATE>	getAggregateCache()	Returns the aggregate cache.
protected @NotNull org.fuin.esc.api.EventStore	getEventStore()	Returns the underlying event store.
protected abstract @NotNull String	getIdParamName()	Returns the parameter name for the unique identifier.
protected int	getMaxTryCount()	Returns the number of tries that should be done to resolve a version conflict.
int	getReadPageSize()	Returns the number of events to read in a slice.
AGGREGATE	read(ID aggregateId)	Reads the latest version of an aggregate.
AGGREGATE	read(ID aggregateId, int version)	Reads a given version of an aggregate.
void	update(AGGREGATE aggregate)	Saves the changes on an aggregate in the repository without any meta data.
void	update(AGGREGATE aggregate, String metaType, Object metaData)	Saves the changes on an aggregate in the repository including some meta data.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.fuin.ddd4j.ddd.Repository

create, getAggregateClass, getAggregateType

Constructor Detail

EventStoreRepository

protected EventStoreRepository(@NotNull
                               @NotNull org.fuin.esc.api.EventStore eventStore)

Constructor with all mandatory data.

Parameters:

eventStore - Event store.

Method Detail

read

public final AGGREGATE read(ID aggregateId)
                     throws AggregateNotFoundException,
                            AggregateDeletedException

Description copied from interface: Repository

Reads the latest version of an aggregate.

Specified by:

read in interface Repository<ID extends AggregateRootId,AGGREGATE extends AggregateRoot<ID>>

Parameters:

aggregateId - 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

public final AGGREGATE read(ID aggregateId,
                            int version)
                     throws AggregateNotFoundException,
                            AggregateDeletedException,
                            AggregateVersionNotFoundException

Description copied from interface: Repository

Reads a given version of an aggregate.

Specified by:

read in interface Repository<ID extends AggregateRootId,AGGREGATE extends AggregateRoot<ID>>

Parameters:

aggregateId - 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

public final void update(AGGREGATE aggregate)
                  throws AggregateVersionConflictException,
                         AggregateNotFoundException,
                         AggregateDeletedException

Description copied from interface: Repository

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

Specified by:

update in interface Repository<ID extends AggregateRootId,AGGREGATE extends AggregateRoot<ID>>

Parameters:

aggregate - Aggregate to store.

Throws:

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

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

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

update

public final void update(AGGREGATE aggregate,
                         String metaType,
                         Object metaData)
                  throws AggregateVersionConflictException,
                         AggregateNotFoundException,
                         AggregateDeletedException

Description copied from interface: Repository

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

Specified by:

update in interface Repository<ID extends AggregateRootId,AGGREGATE extends AggregateRoot<ID>>

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.

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

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

add

public void add(AGGREGATE aggregate)
         throws AggregateAlreadyExistsException,
                AggregateDeletedException

Description copied from interface: Repository

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

Specified by:

add in interface Repository<ID extends AggregateRootId,AGGREGATE extends AggregateRoot<ID>>

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

public void add(AGGREGATE aggregate,
                String metaType,
                Object metaData)
         throws AggregateAlreadyExistsException,
                AggregateDeletedException

Description copied from interface: Repository

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

Specified by:

add in interface Repository<ID extends AggregateRootId,AGGREGATE extends AggregateRoot<ID>>

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.

delete

public final void delete(ID aggregateId,
                         int expectedVersion)
                  throws AggregateVersionConflictException

Description copied from interface: Repository

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

Specified by:

delete in interface Repository<ID extends AggregateRootId,AGGREGATE extends AggregateRoot<ID>>

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.

conflictsResolved

protected boolean conflictsResolved(List<DomainEvent<?>> uncommittedChanges,
                                    List<DomainEvent<?>> unseenEvents)

Checks if the uncommitted changes conflicts with unseen changes from the event store and tries to solve the problem. This method may be overwritten by concrete implementation. Returns FALSE as default if not overwritten in subclasses.

Parameters:

uncommittedChanges - Uncommitted changes.

unseenEvents - Unseen changes from the event store.

Returns:

TRUE if there are no conflicting changes, else FALSE (conflict couldn't be resolved).

getMaxTryCount

protected int getMaxTryCount()

Returns the number of tries that should be done to resolve a version conflict. This method may be overwritten by concrete implementation. Returns 3 as default if not overwritten in subclasses.

Returns:

Number of tries.

getAggregateCache

@NotNull
protected @NotNull AggregateCache<AGGREGATE> getAggregateCache()

Returns the aggregate cache. This method may be overwritten by concrete implementation. Returns no cache as default if not overwritten in subclasses.

Returns:

Cache.

getReadPageSize

public int getReadPageSize()

Returns the number of events to read in a slice. This method may be overwritten by concrete implementation. Returns 100 as default if not overwritten in subclasses.

Returns:

Page size.

getEventStore

@NotNull
protected final @NotNull org.fuin.esc.api.EventStore getEventStore()

Returns the underlying event store.

Returns:

Event store implementation.

getIdParamName

@NotNull
protected abstract @NotNull String getIdParamName()

Returns the parameter name for the unique identifier.

Returns:

Name to be used as parameter.