Package org.springframework.beans.factory.aot

Class BeanInstanceSupplier<T>

java.lang.Object

org.springframework.beans.factory.aot.BeanInstanceSupplier<T>

Type Parameters:

T - the type of instance supplied by this supplier

All Implemented Interfaces:

Supplier<T>, InstanceSupplier<T>, ThrowingSupplier<T>

public final class BeanInstanceSupplier<T>
extends Object
implements InstanceSupplier<T>

Specialized InstanceSupplier that provides the factory Method used to instantiate the underlying bean instance, if any. Transparently handles resolution of AutowiredArguments if necessary. Typically used in AOT-processed applications as a targeted alternative to the reflection based injection.

If no generator is provided, reflection is used to instantiate the bean instance, and full invocation hints are contributed. Multiple generator callback styles are supported:

• A function with the registeredBean and resolved arguments for executables that require arguments resolution. An introspection hint is added so that parameter annotations can be read
• A function with only the registeredBean for simpler cases that do not require resolution of arguments
• A supplier when a method reference can be used

Generator callbacks handle checked exceptions so that the caller does not have to deal with them.

Since:

6.0

Author:

Phillip Webb, Stephane Nicoll

See Also:

• AutowiredArguments

Method Summary

Modifier and Type	Method	Description
static <T> BeanInstanceSupplier<T>	forConstructor(Class<?>... parameterTypes)	Create a BeanInstanceSupplier that resolves arguments for the specified bean constructor.
static <T> BeanInstanceSupplier<T>	forFactoryMethod(Class<?> declaringClass, String methodName, Class<?>... parameterTypes)	Create a new BeanInstanceSupplier that resolves arguments for the specified factory method.
T	get(RegisteredBean registeredBean)	Get the supplied instance.
Method	getFactoryMethod()	Return the factory method that this supplier uses to create the instance, or null if it is not known or this supplier uses another means.
protected final void	registerDependentBeans(ConfigurableBeanFactory beanFactory, String beanName, Set<String> autowiredBeanNames)
BeanInstanceSupplier<T>	withGenerator(ThrowingBiFunction<RegisteredBean,AutowiredArguments,T> generator)	Return a new BeanInstanceSupplier instance that uses the specified generator bi-function to instantiate the underlying bean.
BeanInstanceSupplier<T>	withGenerator(ThrowingFunction<RegisteredBean,T> generator)	Return a new BeanInstanceSupplier instance that uses the specified generator function to instantiate the underlying bean.
BeanInstanceSupplier<T>	withGenerator(ThrowingSupplier<T> generator)	Return a new BeanInstanceSupplier instance that uses the specified generator supplier to instantiate the underlying bean.
BeanInstanceSupplier<T>	withShortcuts(String... beanNames)	Return a new BeanInstanceSupplier instance that uses direct bean name injection shortcuts for specific parameters.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.beans.factory.support.InstanceSupplier

andThen, getWithException

Methods inherited from interface org.springframework.util.function.ThrowingSupplier

get, get, throwing

Method Details

forConstructor

public static <T> BeanInstanceSupplier<T> forConstructor(Class<?>... parameterTypes)

Create a BeanInstanceSupplier that resolves arguments for the specified bean constructor.

Type Parameters:

T - the type of instance supplied

Parameters:

parameterTypes - the constructor parameter types

Returns:

a new BeanInstanceSupplier instance

forFactoryMethod

public static <T> BeanInstanceSupplier<T> forFactoryMethod(Class<?> declaringClass,
 String methodName,
 Class<?>... parameterTypes)

Create a new BeanInstanceSupplier that resolves arguments for the specified factory method.

Type Parameters:

T - the type of instance supplied

Parameters:

declaringClass - the class that declares the factory method

methodName - the factory method name

parameterTypes - the factory method parameter types

Returns:

a new BeanInstanceSupplier instance

withGenerator

public BeanInstanceSupplier<T> withGenerator(ThrowingBiFunction<RegisteredBean,AutowiredArguments,T> generator)

Return a new BeanInstanceSupplier instance that uses the specified generator bi-function to instantiate the underlying bean.

Parameters:

generator - a ThrowingBiFunction that uses the RegisteredBean and resolved AutowiredArguments to instantiate the underlying bean

Returns:

a new BeanInstanceSupplier instance with the specified generator

withGenerator

public BeanInstanceSupplier<T> withGenerator(ThrowingFunction<RegisteredBean,T> generator)

Return a new BeanInstanceSupplier instance that uses the specified generator function to instantiate the underlying bean.

Parameters:

generator - a ThrowingFunction that uses the RegisteredBean to instantiate the underlying bean

Returns:

a new BeanInstanceSupplier instance with the specified generator

withGenerator

public BeanInstanceSupplier<T> withGenerator(ThrowingSupplier<T> generator)

Return a new BeanInstanceSupplier instance that uses the specified generator supplier to instantiate the underlying bean.

Parameters:

generator - a ThrowingSupplier to instantiate the underlying bean

Returns:

a new BeanInstanceSupplier instance with the specified generator

withShortcuts

public BeanInstanceSupplier<T> withShortcuts(String... beanNames)

Return a new BeanInstanceSupplier instance that uses direct bean name injection shortcuts for specific parameters.

Parameters:

beanNames - the bean names to use as shortcuts (aligned with the constructor or factory method parameters)

Returns:

a new BeanInstanceSupplier instance that uses the shortcuts

get

public T get(RegisteredBean registeredBean)
      throws Exception

Description copied from interface: InstanceSupplier

Get the supplied instance.

Specified by:

get in interface InstanceSupplier<T>

Parameters:

registeredBean - the registered bean requesting the instance

Returns:

the supplied instance

Throws:

Exception - on error

getFactoryMethod

@Nullable
public Method getFactoryMethod()

Description copied from interface: InstanceSupplier

Return the factory method that this supplier uses to create the instance, or null if it is not known or this supplier uses another means.

Specified by:

getFactoryMethod in interface InstanceSupplier<T>

Returns:

the factory method used to create the instance, or null

registerDependentBeans

protected final void registerDependentBeans(ConfigurableBeanFactory beanFactory,
 String beanName,
 Set<String> autowiredBeanNames)