BootstrapContext Type — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/bootstrap/BootstrapContext.java lines 41–94

public interface BootstrapContext {

	/**
	 * Return an instance from the context if the type has been registered. The instance
	 * will be created if it hasn't been accessed previously.
	 * @param <T> the instance type
	 * @param type the instance type
	 * @return the instance managed by the context, which may be {@code null}
	 * @throws IllegalStateException if the type has not been registered
	 */
	<T> @Nullable T get(Class<T> type) throws IllegalStateException;

	/**
	 * Return an instance from the context if the type has been registered. The instance
	 * will be created if it hasn't been accessed previously.
	 * @param <T> the instance type
	 * @param type the instance type
	 * @param other the instance to use if the type has not been registered
	 * @return the instance, which may be {@code null}
	 */
	<T> @Nullable T getOrElse(Class<T> type, @Nullable T other);

	/**
	 * Return an instance from the context if the type has been registered. The instance
	 * will be created if it hasn't been accessed previously.
	 * @param <T> the instance type
	 * @param type the instance type
	 * @param other a supplier for the instance to use if the type has not been registered
	 * @return the instance, which may be {@code null}
	 */
	<T> @Nullable T getOrElseSupply(Class<T> type, Supplier<@Nullable T> other);

	/**
	 * Return an instance from the context if the type has been registered. The instance
	 * will be created if it hasn't been accessed previously.
	 * @param <T> the instance type
	 * @param <X> the exception to throw if the type is not registered
	 * @param type the instance type
	 * @param exceptionSupplier the supplier which will return the exception to be thrown
	 * @return the instance managed by the context, which may be {@code null}
	 * @throws X if the type has not been registered
	 */
	<T, X extends Throwable> @Nullable T getOrElseThrow(Class<T> type, Supplier<? extends X> exceptionSupplier)
			throws X;

	/**
	 * Return if a registration exists for the given type.
	 * @param <T> the instance type
	 * @param type the instance type
	 * @return {@code true} if the type has already been registered
	 */
	<T> boolean isRegistered(Class<T> type);

}