Class AbstractSerializingCacheStorage<T,CAS>

java.lang.Object

org.apache.hc.client5.http.impl.cache.AbstractSerializingCacheStorage<T,CAS>

All Implemented Interfaces:

HttpCacheStorage

Direct Known Subclasses:

AbstractBinaryCacheStorage

public abstract class AbstractSerializingCacheStorage<T,CAS>
extends Object
implements HttpCacheStorage

Abstract cache backend for serialized objects capable of CAS (compare-and-swap) updates.

Since:

5.0

Field Summary

Fields

Modifier and Type	Field	Description
private final int	maxUpdateRetries
private final HttpCacheEntrySerializer<T>	serializer

Constructor Summary

Constructors

Constructor	Description
AbstractSerializingCacheStorage(int maxUpdateRetries, HttpCacheEntrySerializer<T> serializer)

Method Summary

Modifier and Type	Method	Description
protected abstract Map<String,T>	bulkRestore(Collection<String> storageKeys)
protected abstract void	delete(String storageKey)
protected abstract String	digestToStorageKey(String key)
final Map<String, HttpCacheEntry>	getEntries(Collection<String> keys)	Retrieves multiple cache entries stored under the given keys.
final HttpCacheEntry	getEntry(String key)	Retrieves the cache entry stored under the given key or null if no entry exists under that key.
protected abstract CAS	getForUpdateCAS(String storageKey)
protected abstract T	getStorageObject(CAS cas)
final void	putEntry(String key, HttpCacheEntry entry)	Store a given cache entry under the given key.
final void	removeEntry(String key)	Deletes/invalidates/removes any cache entries currently stored under the given key.
protected abstract T	restore(String storageKey)
protected abstract void	store(String storageKey, T storageObject)
protected abstract boolean	updateCAS(String storageKey, CAS cas, T storageObject)
final void	updateEntry(String key, HttpCacheCASOperation casOperation)	Atomically applies the given callback to processChallenge an existing cache entry under a given key.

Methods inherited from class Object

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

Field Details

maxUpdateRetries

private final int maxUpdateRetries

serializer

private final HttpCacheEntrySerializer<T> serializer

Constructor Details

AbstractSerializingCacheStorage

public AbstractSerializingCacheStorage(int maxUpdateRetries,
 HttpCacheEntrySerializer<T> serializer)

Method Details

digestToStorageKey

protected abstract String digestToStorageKey(String key)

store

protected abstract void store(String storageKey,
 T storageObject)
                       throws ResourceIOException

Throws:

ResourceIOException

restore

protected abstract T restore(String storageKey)
                      throws ResourceIOException

Throws:

ResourceIOException

getForUpdateCAS

protected abstract CAS getForUpdateCAS(String storageKey)
                                throws ResourceIOException

Throws:

ResourceIOException

getStorageObject

protected abstract T getStorageObject(CAS cas)
                               throws ResourceIOException

Throws:

ResourceIOException

updateCAS

protected abstract boolean updateCAS(String storageKey,
 CAS cas,
 T storageObject)
                              throws ResourceIOException

Throws:

ResourceIOException

delete

protected abstract void delete(String storageKey)
                        throws ResourceIOException

Throws:

ResourceIOException

bulkRestore

protected abstract Map<String,T> bulkRestore(Collection<String> storageKeys)
                                      throws ResourceIOException

Throws:

ResourceIOException

putEntry

public final void putEntry(String key,
 HttpCacheEntry entry)
                    throws ResourceIOException

Description copied from interface: HttpCacheStorage

Store a given cache entry under the given key.

Specified by:

putEntry in interface HttpCacheStorage

Parameters:

key - where in the cache to store the entry

entry - cached response to store

Throws:

ResourceIOException

getEntry

public final HttpCacheEntry getEntry(String key)
                              throws ResourceIOException

Description copied from interface: HttpCacheStorage

Retrieves the cache entry stored under the given key or null if no entry exists under that key.

Specified by:

getEntry in interface HttpCacheStorage

Parameters:

key - cache key

Returns:

an HttpCacheEntry or null if no entry exists

Throws:

ResourceIOException

removeEntry

public final void removeEntry(String key)
                       throws ResourceIOException

Description copied from interface: HttpCacheStorage

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

Specified by:

removeEntry in interface HttpCacheStorage

Parameters:

key -

Throws:

ResourceIOException

updateEntry

public final void updateEntry(String key,
 HttpCacheCASOperation casOperation)
                       throws HttpCacheUpdateException,
ResourceIOException

Description copied from interface: HttpCacheStorage

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

Specified by:

updateEntry in interface HttpCacheStorage

Parameters:

key - indicates which entry to modify

casOperation - the CAS operation to perform.

Throws:

HttpCacheUpdateException

ResourceIOException

getEntries

public final Map<String, HttpCacheEntry> getEntries(Collection<String> keys)
                                             throws ResourceIOException

Description copied from interface: HttpCacheStorage

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

Specified by:

getEntries in interface HttpCacheStorage

Parameters:

keys - cache keys

Returns:

an map of HttpCacheEntrys.

Throws:

ResourceIOException