org.axonframework.commandhandling.conflictresolution

Class ConflictResolution

java.lang.Object

org.axonframework.commandhandling.conflictresolution.ConflictResolution

All Implemented Interfaces:

ParameterResolver<ConflictResolver>, ParameterResolverFactory

public class ConflictResolution
extends Object
implements ParameterResolverFactory, ParameterResolver<ConflictResolver>

ParameterResolverFactory that add support for the ConflictResolver parameter type in annotated handlers.

Conflict resolution can be initialized by passing a ConflictResolver to the static initialize(ConflictResolver) method. Note that a UnitOfWork needs to be active before conflict resolution can be initialized.

Author:

Rene de Waele

Constructor Summary

Constructors

Constructor and Description
ConflictResolution()

Method Summary

Modifier and Type	Method and Description
ParameterResolver	createInstance(Executable executable, Parameter[] parameters, int parameterIndex) If available, creates a ParameterResolver instance that can provide a parameter of type parameterType for a given message.
static ConflictResolver	getConflictResolver() Returns the ConflictResolver instance that can be used to resolve conflicts of an Aggregate that has been previously loaded in this Unit of Work.
static void	initialize(ConflictResolver conflictResolver) Initialize conflict resolution in the context of the current Unit of Work dealing with a command on an event sourced aggregate.
boolean	matches(Message<?> message) Indicates whether this resolver is capable of providing a value for the given message.
ConflictResolver	resolveParameterValue(Message<?> message) Resolves the parameter value to use for the given message, or null if no suitable parameter value can be resolved.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.axonframework.messaging.annotation.ParameterResolver

supportedPayloadType

Constructor Detail

ConflictResolution

public ConflictResolution()

Method Detail

initialize

public static void initialize(ConflictResolver conflictResolver)

Initialize conflict resolution in the context of the current Unit of Work dealing with a command on an event sourced aggregate.

Parameters:

conflictResolver - conflict resolver able to detect conflicts

getConflictResolver

public static ConflictResolver getConflictResolver()

Returns the ConflictResolver instance that can be used to resolve conflicts of an Aggregate that has been previously loaded in this Unit of Work. Note that, when multiple aggregates are loaded, the ConflictResolver that was registered last, is returned.

Any conflicts must be resolved (by invoking one of the methods on ConflictResolver) before the Unit of Work is committed.

If no Aggregate was loaded, or no conflicts are present, this method will return a NoConflictResolver, instance.

Returns:

The ConflictResolver for the last loaded Aggregate.

createInstance

public ParameterResolver createInstance(Executable executable,
                                        Parameter[] parameters,
                                        int parameterIndex)

Description copied from interface: ParameterResolverFactory

If available, creates a ParameterResolver instance that can provide a parameter of type parameterType for a given message.

If the ParameterResolverFactory cannot provide a suitable ParameterResolver, returns null.

Specified by:

createInstance in interface ParameterResolverFactory

Parameters:

executable - The executable (constructor or method) to inspect

parameters - The parameters on the executable to inspect

parameterIndex - The index of the parameter to return a ParameterResolver for

Returns:

a suitable ParameterResolver, or null if none is found

resolveParameterValue

public ConflictResolver resolveParameterValue(Message<?> message)

Description copied from interface: ParameterResolver

Resolves the parameter value to use for the given message, or null if no suitable parameter value can be resolved.

Specified by:

resolveParameterValue in interface ParameterResolver<ConflictResolver>

Parameters:

message - The message to resolve the value from

Returns:

the parameter value for the handler

matches

public boolean matches(Message<?> message)

Description copied from interface: ParameterResolver

Indicates whether this resolver is capable of providing a value for the given message.

Specified by:

matches in interface ParameterResolver<ConflictResolver>

Parameters:

message - The message to evaluate

Returns:

true if this resolver can provide a value for the message, otherwise false