org.springframework.boot.util

Class LambdaSafe

java.lang.Object

org.springframework.boot.util.LambdaSafe

public final class LambdaSafe
extends Object

Utility that can be used to invoke lambdas in a safe way. Primarily designed to help support generically typed callbacks where class cast exceptions need to be dealt with due to class erasure.

Since:

2.0.0

Author:

Phillip Webb

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	LambdaSafe.Callback<C,A> Represents a single callback that can be invoked in a lambda safe way.
static class	LambdaSafe.Callbacks<C,A> Represents a collection of callbacks that can be invoked in a lambda safe way.
static class	LambdaSafe.InvocationResult<R> The result of a callback which may be a value, null or absent entirely if the callback wasn't suitable.

Method Summary

Modifier and Type	Method and Description
static <C,A> LambdaSafe.Callback<C,A>	callback(Class<C> callbackType, C callbackInstance, A argument, Object... additionalArguments) Start a call to a single callback instance, dealing with common generic type concerns and exceptions.
static <C,A> LambdaSafe.Callbacks<C,A>	callbacks(Class<C> callbackType, Collection<? extends C> callbackInstances, A argument, Object... additionalArguments) Start a call to callback instances, dealing with common generic type concerns and exceptions.

Methods inherited from class java.lang.Object

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

Method Detail

callback

public static <C,A> LambdaSafe.Callback<C,A> callback(Class<C> callbackType,
                                                      C callbackInstance,
                                                      A argument,
                                                      Object... additionalArguments)

Start a call to a single callback instance, dealing with common generic type concerns and exceptions.

Type Parameters:

C - the callback type

A - the primary argument type

Parameters:

callbackType - the callback type (a functional interface)

callbackInstance - the callback instance (may be a lambda)

argument - the primary argument passed to the callback

additionalArguments - any additional arguments passed to the callback

Returns:

a LambdaSafe.Callback instance that can be invoked.

callbacks

public static <C,A> LambdaSafe.Callbacks<C,A> callbacks(Class<C> callbackType,
                                                        Collection<? extends C> callbackInstances,
                                                        A argument,
                                                        Object... additionalArguments)

Start a call to callback instances, dealing with common generic type concerns and exceptions.

Type Parameters:

C - the callback type

A - the primary argument type

Parameters:

callbackType - the callback type (a functional interface)

callbackInstances - the callback instances (elements may be lambdas)

argument - the primary argument passed to the callbacks

additionalArguments - any additional arguments passed to the callbacks

Returns:

a LambdaSafe.Callbacks instance that can be invoked.