org.axonframework.common.annotation

Class ClasspathParameterResolverFactory

java.lang.Object

org.axonframework.common.annotation.ClasspathParameterResolverFactory

All Implemented Interfaces:

ParameterResolverFactory

public final class ClasspathParameterResolverFactory
extends Object
implements ParameterResolverFactory

ParameterResolverFactory instance that locates other ParameterResolverFactory instances on the class path. It uses the ServiceLoader mechanism to locate and initialize them.

This means for this class to find implementations, their fully qualified class name has to be put into a file called META-INF/services/org.axonframework.common.annotation.ParameterResolverFactory. For more details, see ServiceLoader.

Since:

2.1

Author:

Allard Buijze

See Also:

ServiceLoader

Method Summary

Methods

Modifier and Type	Method and Description
ParameterResolver	createInstance(Annotation[] memberAnnotations, Class<?> parameterType, Annotation[] parameterAnnotations) If available, creates a ParameterResolver instance that can provide a parameter of type parameterType for a given message.
static ParameterResolverFactory	forClass(Class<?> clazz) Creates an instance for the given clazz.
static ClasspathParameterResolverFactory	forClassLoader(ClassLoader classLoader) Creates an instance using the given classLoader.

Methods inherited from class java.lang.Object

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

Method Detail

forClass

public static ParameterResolverFactory forClass(Class<?> clazz)

Creates an instance for the given clazz. Effectively, the class loader of the given class is used to locate implementations.

Parameters:

clazz - The class for which the parameter resolver must be returned

Returns:

a ClasspathParameterResolverFactory that can resolve parameters for the given class

forClassLoader

public static ClasspathParameterResolverFactory forClassLoader(ClassLoader classLoader)

Creates an instance using the given classLoader. Implementations are located using this class loader.

Parameters:

classLoader - The class loader to locate the implementations with

Returns:

a ClasspathParameterResolverFactory instance using the given classLoader

createInstance

public ParameterResolver createInstance(Annotation[] memberAnnotations,
                               Class<?> parameterType,
                               Annotation[] parameterAnnotations)

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:

memberAnnotations - annotations placed on the member (e.g. method)

parameterType - the parameter type to find a resolver for

parameterAnnotations - annotations placed on the parameter

Returns:

a suitable ParameterResolver, or null if none is found