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

Nested Class Summary

Nested Classes
Modifier and Type	Class	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

All Methods Static Methods Concrete Methods
Modifier and Type	Method	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.

Class LambdaSafe

Nested Class Summary

Method Summary

Methods inherited from class java.lang.Object

Method Detail

callback

callbacks