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Actual caching of null values in retrieve(key, valueLoader)

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See gh-31637
This commit is contained in:
Juergen Hoeller
2023-11-22 15:56:26 +01:00
parent 441e210533
commit 824bc09d11
3 changed files with 14 additions and 5 deletions
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8
spring-context/src/main/java/org/springframework/cache/Cache.java vendored
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@@ -151,10 +151,10 @@ public interface Cache {
* <p>If possible, implementations should ensure that the loading operation
* is synchronized so that the specified {@code valueLoader} is only called
* once in case of concurrent access on the same key.
* <p>Null values are generally not supported by this method. The provided
* {@link CompletableFuture} handle produces a value or raises an exception.
* If the {@code valueLoader} raises an exception, it will be propagated
* to the {@code CompletableFuture} handle returned from here.
* <p>Null values always indicate a user-level {@code null} value with this
* method. The provided {@link CompletableFuture} handle produces a value
* or raises an exception. If the {@code valueLoader} raises an exception,
* it will be propagated to the returned {@code CompletableFuture} handle.
* @param key the key whose associated value is to be returned
* @return the value to which this cache maps the specified key, contained
* within a {@link CompletableFuture} which will never be {@code null}.