Package org.instancio.spi

Interface InstancioServiceProvider

public interface InstancioServiceProvider

Instancio Service Provider Interface for providing custom:

• generator mappings via getGeneratorProvider()
• subtype mappings via getTypeResolver()
• class instantiation logic via getTypeInstantiator()
• setter resolution via getSetterMethodResolver()

All of the above are default methods that return null. Implementations of this class can override one or more methods as needed. Instancio will invoke each of the above methods only once, therefore, these methods may contain initialisation logic.

This class uses the ServiceLoader mechanism. Therefore, implementations must be registered by placing a file named org.instancio.spi.InstancioServiceProvider under /META-INF/services. The file must contain the fully-qualified name of the implementing class.

Note: only InstancioServiceProvider (and not the interfaces defined within it) can be registered via the ServiceLoader.

Since:

2.11.0

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	InstancioServiceProvider.GeneratorProvider	Provides custom Generator classes.
static interface	InstancioServiceProvider.SetterMethodResolver	Resolves setter method based on a given node when Keys.ASSIGNMENT_TYPE is set to AssignmentType.METHOD.
static interface	InstancioServiceProvider.TypeInstantiator	Provides custom instantiation logic.
static interface	InstancioServiceProvider.TypeResolver	Resolves subtype based on a given class.

Method Summary

Modifier and Type	Method	Description
default InstancioServiceProvider.GeneratorProvider	getGeneratorProvider()	Returns a GeneratorProvider implementation.
default InstancioServiceProvider.SetterMethodResolver	getSetterMethodResolver()	Returns a SetterMethodResolver implementation.
default InstancioServiceProvider.TypeInstantiator	getTypeInstantiator()	Returns a TypeInstantiator implementation.
default InstancioServiceProvider.TypeResolver	getTypeResolver()	Returns a TypeResolver implementation.
default void	init(ServiceProviderContext context)	An optional method that can be used by implementations that require access to the context information.

Method Details

init

@ExperimentalApi
default void init(ServiceProviderContext context)

An optional method that can be used by implementations that require access to the context information.

Parameters:

context - containing additional information

Since:

2.12.0

getGeneratorProvider

default InstancioServiceProvider.GeneratorProvider getGeneratorProvider()

Returns a GeneratorProvider implementation.

Instancio will automatically use generators configured using the provider. As an example, consider the following use-case where Person objects need to be created with valid phone numbers. To achieve this, a custom Phone generator is supplied:

   Generator<Phone> phoneGenerator = createPhoneGenerator();

   Person person = Instancio.of(Person.class)
      .supply(all(Phone.class), phoneGenerator)
      .create();
 

To avoid specifying the generator manually, the Phone generator can be registered using the GeneratorProvider. Once registered, the Person can be created without specifying the generator explicitly:

   Person person = Instancio.create(Person.class); // uses Phone generator
 

Returns:

a custom generator provider, or null if not required

Since:

2.11.0

getTypeResolver

default InstancioServiceProvider.TypeResolver getTypeResolver()

Returns a TypeResolver implementation.

Returns:

a custom type resolver, or null if not required

Since:

2.11.0

getTypeInstantiator

default InstancioServiceProvider.TypeInstantiator getTypeInstantiator()

Returns a TypeInstantiator implementation.

Returns:

a custom type instantiator, or null if not required

Since:

2.11.0

getSetterMethodResolver

@ExperimentalApi
default InstancioServiceProvider.SetterMethodResolver getSetterMethodResolver()

Returns a SetterMethodResolver implementation.

Returns:

a custom setter method resolver, or null if not required

Since:

3.2.0