Java Doc for Cache.java in  » Web-Server » Quadcap-Web-Server » com » quadcap » util » collections » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Quadcap Web Server » com.quadcap.util.collections 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   com.quadcap.util.collections.Cache

All known Subclasses:   com.quadcap.http.servlets.file.FileCache,
Cache
abstract public class Cache (Code)
This class manages a number of buffers on an underlying store.

What about write-through policies?
author:
   Stan Bailes



Field Summary
 Objectlock
    
 DListlru
    
 intsize
    
 Objectstore
    
 Hashtablet
    


Method Summary
 voidcheckCache()
    
public  voidflush()
     Flush all modified items back to the underlying store.
public  Objectget(Object key)
     Get the specified object from the cache, if available; from the underlying store if not.
public  CacheablegetCacheable(Object key)
     Search the cache for the specified key and return the associated cache item if one was found.
 CacheablegetCacheable()
     Find a free cache slot.
public  voidinit(Object store, int size)
     Initialize the cache.
abstract public  CacheablemakeCacheable()
     Factory to create an empty cache slot.
public  voidput(Object key, Object val)
     Store the object in the cache.
public  voidsetLock(Object lock)
     Specify the lock-object to be used to synchronize access to the cache.
public  voidshow(PrintWriter os)
    

Field Detail
lock
Object lock(Code)



lru
DList lru(Code)



size
int size(Code)



store
Object store(Code)



t
Hashtable t(Code)





Method Detail
checkCache
void checkCache()(Code)



flush
public void flush() throws IOException(Code)
Flush all modified items back to the underlying store.



get
public Object get(Object key) throws IOException(Code)
Get the specified object from the cache, if available; from the underlying store if not. In any case, the object (if found) should be in the cache after this call.

If the object isn't in the cache OR the underlying store, this method should return null, and the contents of both the cache and the underlying store should remain unchanged.

This implementation doesn't change the underlying store, but the cache ends up holding a CacheItem with a null data component.
Parameters:
  key - the search key return the data associated with the key




getCacheable
public Cacheable getCacheable(Object key) throws IOException(Code)
Search the cache for the specified key and return the associated cache item if one was found. Otherwise, find a free cache item and initialize it from the underlying store.
Parameters:
  key - the search key the cache item associated with the specified key.



getCacheable
Cacheable getCacheable() throws IOException(Code)
Find a free cache slot. If necessary, seize an existing cache slot, with preference for the "least recently used" item. This function should only be called if the lock on the cache is held by this thread.



init
public void init(Object store, int size)(Code)
Initialize the cache.
Parameters:
  s - the underlying store
Parameters:
  size - the size of the cache



makeCacheable
abstract public Cacheable makeCacheable()(Code)
Factory to create an empty cache slot. Only a fixed number of cache slots should be created, and they should then be recycled, never destroyed.



put
public void put(Object key, Object val) throws IOException(Code)
Store the object in the cache. The object will be marked dirty, and will eventually be written back to the underlying store.



setLock
public void setLock(Object lock)(Code)
Specify the lock-object to be used to synchronize access to the cache. If the lock isn't specified, it defaults to the cache object itself.
Parameters:
  lock - the lock object



show
public void show(PrintWriter os)(Code)



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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