@Contract(threading=SAFE) public class ManagedHttpCacheStorage extends Object implements HttpCacheStorage, Closeable
HttpCacheStorage implementation capable of deallocating resources associated with
the cache entries.
This cache keeps track of cache entries using
PhantomReference and maintains a collection of all resources that
are no longer in use. The cache, however, does not automatically deallocates associated
resources by invoking Resource.dispose() method. The consumer MUST periodically
call cleanResources() method to trigger resource deallocation. The cache can be
permanently shut down using shutdown() method. All resources associated with
the entries used by the cache will be deallocated.
This HttpCacheStorage implementation is intended for use with FileResource
and similar.
Compatibility note. Prior to version 4.4 this storage implementation used to dispose of
all resource entries upon close(). As of version 4.4 the close() method
disposes only of those resources that have been explicitly removed from the cache with
removeEntry(String) method.
The shutdown() ()} method can still be used to shut down the storage and dispose of
all resources currently managed by it.
| Constructor and Description |
|---|
ManagedHttpCacheStorage(CacheConfig config) |
| Modifier and Type | Method and Description |
|---|---|
void |
cleanResources() |
void |
close() |
HttpCacheEntry |
getEntry(String url)
Retrieves the cache entry stored under the given key
or null if no entry exists under that key.
|
void |
putEntry(String url,
HttpCacheEntry entry)
Store a given cache entry under the given key.
|
void |
removeEntry(String url)
Deletes/invalidates/removes any cache entries currently
stored under the given key.
|
void |
shutdown() |
void |
updateEntry(String url,
HttpCacheUpdateCallback callback)
Atomically applies the given callback to update an existing cache
entry under a given key.
|
public ManagedHttpCacheStorage(CacheConfig config)
public void putEntry(String url, HttpCacheEntry entry) throws IOException
HttpCacheStorageputEntry in interface HttpCacheStorageurl - where in the cache to store the entryentry - cached response to storeIOExceptionpublic HttpCacheEntry getEntry(String url) throws IOException
HttpCacheStoragegetEntry in interface HttpCacheStorageurl - cache keyHttpCacheEntry or null if no
entry existsIOExceptionpublic void removeEntry(String url) throws IOException
HttpCacheStorageremoveEntry in interface HttpCacheStorageIOExceptionpublic void updateEntry(String url, HttpCacheUpdateCallback callback) throws IOException
HttpCacheStorageupdateEntry in interface HttpCacheStorageurl - indicates which entry to modifycallback - performs the update; see
HttpCacheUpdateCallback for details, but roughly the
callback expects to be handed the current entry and will return
the new value for the entry.IOExceptionpublic void cleanResources()
public void shutdown()
public void close()
close in interface Closeableclose in interface AutoCloseableCopyright © 1999–2022 The Apache Software Foundation. All rights reserved.