Sticky (cactoos 0.54.0 API)

java.lang.Object
- org.cactoos.scalar.Sticky<T>

Type Parameters:

T - Type of result

All Implemented Interfaces:

Scalar<T>
```
public final class Sticky<T>
extends Object
implements Scalar<T>
```
Cached version of a Scalar.
This Scalar decorator technically is an in-memory cache.

Pay attention that this class is not thread-safe. It is highly recommended to always decorate it with Synced.

This class implements Scalar, which throws a checked Exception. This may not be convenient in many cases. To make it more convenient and get rid of the checked exception you can use the Unchecked decorator. Or you may use IoChecked to wrap it in an IOException.
```
 final Scalar<Integer> scalar = new StickyScalar<>(
     () -> {
         System.out.println("Will be printed only once");
         return new SecureRandom().nextInt();
     }
 ).value()
 
```
There is no thread-safety guarantee.
Since:

0.3

See Also:

StickyFunc

- Constructor Summary
  
  Constructors
  Constructor Description
  
  Sticky(Scalar<? extends T> scalar)
  Ctor.
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  T value()
  Convert it to the value.
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Sticky
```
public Sticky(Scalar<? extends T> scalar)
```
    Ctor.
    
    Parameters:
    
    scalar - The Scalar to cache
- Method Detail
  - value
```
public T value()
        throws Exception
```
    Description copied from interface: Scalar
    
    Convert it to the value.
    
    Specified by:
    
    value in interface Scalar<T>
    
    Returns:
    
    The value
    
    Throws:
    
    Exception - If fails