Package software.amazon.awssdk.utils.cache

Class CachedSupplier<T>

java.lang.Object

software.amazon.awssdk.utils.cache.CachedSupplier<T>

All Implemented Interfaces:

AutoCloseable, Supplier<T>, SdkAutoCloseable

public class CachedSupplier<T>
extends Object
implements Supplier<T>, SdkAutoCloseable

A wrapper for a Supplier that applies certain caching rules to the retrieval of its value, including customizable pre-fetching behaviors for updating values as they get close to expiring so that not all threads have to block to update the value. For example, the OneCallerBlocks strategy will have a single caller block to update the value, and the NonBlocking strategy maintains a thread pool for updating the value asynchronously in the background. This should be created using builder(Supplier).

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	CachedSupplier.Builder<T>	A Builder for CachedSupplier, created by builder(Supplier).
static interface	CachedSupplier.PrefetchStrategy	The way in which the cache should be pre-fetched when the data's RefreshResult.prefetchTime() arrives.
static enum	CachedSupplier.StaleValueBehavior	How the cached supplier should behave when a stale value is retrieved from the underlying supplier or the underlying supplier fails while the cached value is stale.

Method Summary

Modifier and Type	Method	Description
static <T> CachedSupplier.Builder<T>	builder(Supplier<RefreshResult<T>> valueSupplier)	Retrieve a builder that can be used for creating a CachedSupplier.
void	close()	Free any resources consumed by the prefetch strategy this supplier is using.
T	get()

Methods inherited from class java.lang.Object

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

Method Details

builder

public static <T> CachedSupplier.Builder<T> builder(Supplier<RefreshResult<T>> valueSupplier)

Retrieve a builder that can be used for creating a CachedSupplier.

Parameters:

valueSupplier - The value supplier that should have its value cached.

get

public T get()

Specified by:

get in interface Supplier<T>

close

public void close()

Free any resources consumed by the prefetch strategy this supplier is using.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface SdkAutoCloseable