java.lang.Object
- org.springframework.util.function.SingletonSupplier<T>

类型参数:
T - the type of results supplied by this supplier
所有已实现的接口:
Supplier<T>
```
public class SingletonSupplier<T>
extends Object
implements Supplier<T>
```
A Supplier decorator that caches a singleton result and makes it available from get() (nullable) and obtain() (null-safe).
A SingletonSupplier can be constructed via of factory methods or via constructors that provide a default supplier as a fallback. This is particularly useful for method reference suppliers, falling back to a default supplier for a method that returned null and caching the result.
从以下版本开始:
5.1
作者:
Juergen Hoeller

构造器概要

构造器
构造器	说明
`SingletonSupplier(Supplier<? extends T> instanceSupplier, Supplier<? extends T> defaultSupplier)`	Build a `SingletonSupplier` with the given instance supplier and a default supplier for the case when the instance is `null`.
`SingletonSupplier(T instance, Supplier<? extends T> defaultSupplier)`	Build a `SingletonSupplier` with the given singleton instance and a default supplier for the case when the instance is `null`.

方法概要

所有方法静态方法实例方法具体方法
修饰符和类型	方法	说明
`T`	`get()`	Get the shared singleton instance for this supplier.
`T`	`obtain()`	Obtain the shared singleton instance for this supplier.
`static <T> SingletonSupplier<T>`	`of(Supplier<T> supplier)`	Build a `SingletonSupplier` with the given supplier.
`static <T> SingletonSupplier<T>`	`of(T instance)`	Build a `SingletonSupplier` with the given singleton instance.
`static <T> SingletonSupplier<T>`	`ofNullable(Supplier<T> supplier)`	Build a `SingletonSupplier` with the given supplier.
`static <T> SingletonSupplier<T>`	`ofNullable(T instance)`	Build a `SingletonSupplier` with the given singleton instance.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - SingletonSupplier
```
public SingletonSupplier(@Nullable
                         T instance,
                         Supplier<? extends T> defaultSupplier)
```
    Build a SingletonSupplier with the given singleton instance and a default supplier for the case when the instance is null.
    参数:
    instance - the singleton instance (potentially null)
    defaultSupplier - the default supplier as a fallback
  - SingletonSupplier
```
public SingletonSupplier(@Nullable
                         Supplier<? extends T> instanceSupplier,
                         Supplier<? extends T> defaultSupplier)
```
    Build a SingletonSupplier with the given instance supplier and a default supplier for the case when the instance is null.
    参数:
    instanceSupplier - the immediate instance supplier
    defaultSupplier - the default supplier as a fallback
- 方法详细资料
  - get
```
@Nullable
public T get()
```
    Get the shared singleton instance for this supplier.
    指定者:
    get 在接口中 Supplier<T>
    返回:
    the singleton instance (or null if none)
  - obtain
```
public T obtain()
```
    Obtain the shared singleton instance for this supplier.
    返回:
    the singleton instance (never null)
    抛出:
    IllegalStateException - in case of no instance
  - of
```
public static <T> SingletonSupplier<T> of(T instance)
```
    Build a SingletonSupplier with the given singleton instance.
    参数:
    instance - the singleton instance (never null)
    返回:
    the singleton supplier (never null)
  - ofNullable
```
@Nullable
public static <T> SingletonSupplier<T> ofNullable(@Nullable
                                                  T instance)
```
    Build a SingletonSupplier with the given singleton instance.
    参数:
    instance - the singleton instance (potentially null)
    返回:
    the singleton supplier, or null if the instance was null
  - of
```
public static <T> SingletonSupplier<T> of(Supplier<T> supplier)
```
    Build a SingletonSupplier with the given supplier.
    参数:
    supplier - the instance supplier (never null)
    返回:
    the singleton supplier (never null)
  - ofNullable
```
@Nullable
public static <T> SingletonSupplier<T> ofNullable(@Nullable
                                                  Supplier<T> supplier)
```
    Build a SingletonSupplier with the given supplier.
    参数:
    supplier - the instance supplier (potentially null)
    返回:
    the singleton supplier, or null if the instance supplier was null

类 SingletonSupplier<T>

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

SingletonSupplier

SingletonSupplier

方法详细资料

get

obtain

of

ofNullable

of

ofNullable