Package org.apache.http.impl.client.cache

Class BasicHttpCacheStorage

java.lang.Object

org.apache.http.impl.client.cache.BasicHttpCacheStorage

All Implemented Interfaces:

HttpCacheStorage

@Contract(threading=SAFE)
public class BasicHttpCacheStorage
extends Object
implements HttpCacheStorage

Basic HttpCacheStorage implementation backed by an instance of LinkedHashMap. In other words, cache entries and the cached response bodies are held in-memory. This cache does NOT deallocate resources associated with the cache entries; it is intended for use with HeapResource and similar. This is the default cache storage backend used by CachingHttpClients.

Since:

4.1

Constructor Summary

Constructors

Constructor	Description
BasicHttpCacheStorage(CacheConfig config)

Method Summary

Modifier and Type	Method	Description
HttpCacheEntry	getEntry(String url)	Gets an entry from the cache, if it exists
void	putEntry(String url, HttpCacheEntry entry)	Places a HttpCacheEntry in the cache
void	removeEntry(String url)	Removes a HttpCacheEntry from the cache
void	updateEntry(String url, HttpCacheUpdateCallback callback)	Atomically applies the given callback to update an existing cache entry under a given key.

Methods inherited from class java.lang.Object

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

Constructor Details

BasicHttpCacheStorage

public BasicHttpCacheStorage(CacheConfig config)

Method Details

putEntry

public void putEntry(String url,
 HttpCacheEntry entry)
              throws IOException

Places a HttpCacheEntry in the cache

Specified by:

putEntry in interface HttpCacheStorage

Parameters:

url - Url to use as the cache key

entry - HttpCacheEntry to place in the cache

Throws:

IOException

getEntry

public HttpCacheEntry getEntry(String url)
                        throws IOException

Gets an entry from the cache, if it exists

Specified by:

getEntry in interface HttpCacheStorage

Parameters:

url - Url that is the cache key

Returns:

HttpCacheEntry if one exists, or null for cache miss

Throws:

IOException

removeEntry

public void removeEntry(String url)
                 throws IOException

Removes a HttpCacheEntry from the cache

Specified by:

removeEntry in interface HttpCacheStorage

Parameters:

url - Url that is the cache key

Throws:

IOException

updateEntry

public void updateEntry(String url,
 HttpCacheUpdateCallback callback)
                 throws IOException

Description copied from interface: HttpCacheStorage

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

Specified by:

updateEntry in interface HttpCacheStorage

Parameters:

url - indicates which entry to modify

callback - 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.

Throws:

IOException