All Known Implementing Classes:

AbstractBinaryAsyncCacheStorage, AbstractSerializingAsyncCacheStorage, HttpAsyncCacheStorageAdaptor
```
@Contract(threading=SAFE)
public interface HttpAsyncCacheStorage
```
HttpAsyncCacheStorage represents an abstract HTTP cache storage backend that can then be plugged into the asynchronous (non-blocking ) request execution pipeline.
Implementations of this interface are expected to be threading-safe.

Since:

5.0

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`org.apache.hc.core5.concurrent.Cancellable`	`getEntries(java.util.Collection<java.lang.String> keys, org.apache.hc.core5.concurrent.FutureCallback<java.util.Map<java.lang.String,HttpCacheEntry>> callback)`	Retrieves multiple cache entries stored under the given keys.
`org.apache.hc.core5.concurrent.Cancellable`	`getEntry(java.lang.String key, org.apache.hc.core5.concurrent.FutureCallback<HttpCacheEntry> callback)`	Retrieves the cache entry stored under the given key or null if no entry exists under that key.
`org.apache.hc.core5.concurrent.Cancellable`	`putEntry(java.lang.String key, HttpCacheEntry entry, org.apache.hc.core5.concurrent.FutureCallback<java.lang.Boolean> callback)`	Store a given cache entry under the given key.
`org.apache.hc.core5.concurrent.Cancellable`	`removeEntry(java.lang.String key, org.apache.hc.core5.concurrent.FutureCallback<java.lang.Boolean> callback)`	Deletes/invalidates/removes any cache entries currently stored under the given key.
`org.apache.hc.core5.concurrent.Cancellable`	`updateEntry(java.lang.String key, HttpCacheCASOperation casOperation, org.apache.hc.core5.concurrent.FutureCallback<java.lang.Boolean> callback)`	Atomically applies the given callback to processChallenge an existing cache entry under a given key.

Method Detail

putEntry

org.apache.hc.core5.concurrent.Cancellable putEntry(java.lang.String key,
                                                    HttpCacheEntry entry,
                                                    org.apache.hc.core5.concurrent.FutureCallback<java.lang.Boolean> callback)

Store a given cache entry under the given key.

Parameters:: key - where in the cache to store the entry; entry - cached response to store; callback - result callback

getEntry
```
org.apache.hc.core5.concurrent.Cancellable getEntry(java.lang.String key,
                                                    org.apache.hc.core5.concurrent.FutureCallback<HttpCacheEntry> callback)
```
Retrieves the cache entry stored under the given key or null if no entry exists under that key.

Parameters:

key - cache key

callback - result callback

Returns:

an HttpCacheEntry or null if no entry exists

removeEntry

org.apache.hc.core5.concurrent.Cancellable removeEntry(java.lang.String key,
                                                       org.apache.hc.core5.concurrent.FutureCallback<java.lang.Boolean> callback)

Deletes/invalidates/removes any cache entries currently stored under the given key.

Parameters:: key -; callback - result callback

updateEntry

org.apache.hc.core5.concurrent.Cancellable updateEntry(java.lang.String key,
                                                       HttpCacheCASOperation casOperation,
                                                       org.apache.hc.core5.concurrent.FutureCallback<java.lang.Boolean> callback)

Atomically applies the given callback to processChallenge an existing cache entry under a given key.

Parameters:: key - indicates which entry to modify; casOperation - the CAS operation to perform.; callback - result callback

getEntries

org.apache.hc.core5.concurrent.Cancellable getEntries(java.util.Collection<java.lang.String> keys,
                                                      org.apache.hc.core5.concurrent.FutureCallback<java.util.Map<java.lang.String,HttpCacheEntry>> callback)

Retrieves multiple cache entries stored under the given keys. Some implementations may use a single bulk operation to do the retrieval.

Parameters:: keys - cache keys; callback - result callback