org.wandora.piccolo.services

Class FileSystemCache

java.lang.Object

org.wandora.piccolo.services.FileSystemCache

All Implemented Interfaces:

Service, PageCacheService, XMLParamAware

public class FileSystemCache
extends java.lang.Object
implements PageCacheService, XMLParamAware

Page cache that stores pages on disk. This class is XMLParamAware and needs the element cachedir as a parameter. This element must contain the directory used to store the cached pages. This class will also try to get a logger from the symbol table of the XMLParamProcessor with key "logger". If this is not found, a SimpleLogger is used. TODO: this class should be updated so that filenames are given sequentially and are then stored to a HashMap with the original key. This avoids both too long filenames and possible (although unlikely) hash collisions.

Author:

olli

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	FileSystemCache.PageInputStream
class	FileSystemCache.PageOutputStream

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.HashMap	cached
private java.lang.String	cacheDir
private java.util.HashMap	filenames
private java.util.HashMap	locks
private Logger	logger

Constructor Summary

Constructors

Constructor and Description
FileSystemCache() Creates a new instance of FileSystemCache

Method Summary

Modifier and Type	Method and Description
private java.io.FileInputStream	getFile(java.lang.String key)
java.io.InputStream	getPage(java.lang.String key, long modifyTime)
java.lang.String	getServiceName()
java.lang.String	getServiceType()
private java.lang.String	makeFileName(java.lang.String key)
java.io.OutputStream	storePage(java.lang.String key, long modifyTime)
void	xmlParamInitialize(org.w3c.dom.Element element, XMLParamProcessor processor)

Methods inherited from class java.lang.Object

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

Field Detail

logger

private Logger logger

cached

private java.util.HashMap cached

filenames

private java.util.HashMap filenames

cacheDir

private java.lang.String cacheDir

locks

private java.util.HashMap locks

Constructor Detail

FileSystemCache

public FileSystemCache()

Creates a new instance of FileSystemCache

Method Detail

getPage

public java.io.InputStream getPage(java.lang.String key,
                                   long modifyTime)

Specified by:

getPage in interface PageCacheService

getServiceName

public java.lang.String getServiceName()

Specified by:

getServiceName in interface Service

getServiceType

public java.lang.String getServiceType()

Specified by:

getServiceType in interface Service

getFile

private java.io.FileInputStream getFile(java.lang.String key)

makeFileName

private java.lang.String makeFileName(java.lang.String key)

storePage

public java.io.OutputStream storePage(java.lang.String key,
                                      long modifyTime)

Specified by:

storePage in interface PageCacheService

xmlParamInitialize

public void xmlParamInitialize(org.w3c.dom.Element element,
                               XMLParamProcessor processor)

Specified by:

xmlParamInitialize in interface XMLParamAware