Package org.openstreetmap.josm.data.cache

Class JCSCacheManager

java.lang.Object

org.openstreetmap.josm.data.cache.JCSCacheManager

public final class JCSCacheManager
extends java.lang.Object

Wrapper class for JCS Cache. Sets some sane environment and returns instances of cache objects. Static configuration for now assumes some small LRU cache in memory and larger LRU cache on disk

Since:

8168

Field Summary

Fields

Modifier and Type	Field	Description
private static java.nio.channels.FileLock	cacheDirLock
static IntegerProperty	DEFAULT_MAX_OBJECTS_IN_MEMORY	default objects to be held in memory by JCS caches (per region)
private static org.apache.commons.jcs3.auxiliary.AuxiliaryCacheFactory	DISK_CACHE_FACTORY
private static java.util.logging.Logger	jcsLog
private static long	MAX_OBJECT_TTL
private static java.lang.String	PREFERENCE_PREFIX
static BooleanProperty	USE_BLOCK_CACHE	Property that determines the disk cache implementation

Constructor Summary

Constructors

Modifier	Constructor	Description
private	JCSCacheManager()

Method Summary

Modifier and Type	Method	Description
private static void	deleteCacheFiles(java.lang.String basePathPart)
static <K,V> org.apache.commons.jcs3.access.CacheAccess<K,V>	getCache(java.lang.String cacheName)	Returns configured cache object for named cache region
static <K,V> org.apache.commons.jcs3.access.CacheAccess<K,V>	getCache(java.lang.String cacheName, int maxMemoryObjects, int maxDiskObjects, java.lang.String cachePath)	Returns configured cache object with defined limits of memory cache and disk cache
private static <K,V> org.apache.commons.jcs3.access.CacheAccess<K,V>	getCacheAccess(java.lang.String cacheName, org.apache.commons.jcs3.engine.CompositeCacheAttributes cacheAttributes)
private static org.apache.commons.jcs3.engine.CompositeCacheAttributes	getCacheAttributes(int maxMemoryElements)
private static org.apache.commons.jcs3.auxiliary.disk.behavior.IDiskCacheAttributes	getDiskCacheAttributes(int maxDiskObjects, java.lang.String cachePath, java.lang.String cacheName)
private static org.apache.commons.jcs3.auxiliary.AuxiliaryCacheFactory	getDiskCacheFactory()
private static void	removeStaleFiles(java.lang.String basePathPart, java.lang.String suffix)
static void	shutdown()	Close all files to ensure, that all indexes and data are properly written
private static boolean	useBlockCache()

Methods inherited from class java.lang.Object

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

Field Detail

MAX_OBJECT_TTL

private static final long MAX_OBJECT_TTL

See Also:

Constant Field Values

PREFERENCE_PREFIX

private static final java.lang.String PREFERENCE_PREFIX

See Also:

Constant Field Values

USE_BLOCK_CACHE

public static final BooleanProperty USE_BLOCK_CACHE

Property that determines the disk cache implementation

DISK_CACHE_FACTORY

private static final org.apache.commons.jcs3.auxiliary.AuxiliaryCacheFactory DISK_CACHE_FACTORY

cacheDirLock

private static java.nio.channels.FileLock cacheDirLock

DEFAULT_MAX_OBJECTS_IN_MEMORY

public static final IntegerProperty DEFAULT_MAX_OBJECTS_IN_MEMORY

default objects to be held in memory by JCS caches (per region)

jcsLog

private static final java.util.logging.Logger jcsLog

Constructor Detail

JCSCacheManager

private JCSCacheManager()

Method Detail

getDiskCacheFactory

private static org.apache.commons.jcs3.auxiliary.AuxiliaryCacheFactory getDiskCacheFactory()

useBlockCache

private static boolean useBlockCache()

getCache

public static <K,V> org.apache.commons.jcs3.access.CacheAccess<K,V> getCache(java.lang.String cacheName)

Returns configured cache object for named cache region

Type Parameters:

K - key type

V - value type

Parameters:

cacheName - region name

Returns:

cache access object

getCache

public static <K,V> org.apache.commons.jcs3.access.CacheAccess<K,V> getCache(java.lang.String cacheName,
                                                                                         int maxMemoryObjects,
                                                                                         int maxDiskObjects,
                                                                                         java.lang.String cachePath)

Returns configured cache object with defined limits of memory cache and disk cache

Type Parameters:

K - key type

V - value type

Parameters:

cacheName - region name

maxMemoryObjects - number of objects to keep in memory

maxDiskObjects - maximum size of the objects stored on disk in kB

cachePath - path to disk cache. if null, no disk cache will be created

Returns:

cache access object

getCacheAccess

private static <K,V> org.apache.commons.jcs3.access.CacheAccess<K,V> getCacheAccess(java.lang.String cacheName,
                                                                                                org.apache.commons.jcs3.engine.CompositeCacheAttributes cacheAttributes)

shutdown

public static void shutdown()

Close all files to ensure, that all indexes and data are properly written

getDiskCacheAttributes

private static org.apache.commons.jcs3.auxiliary.disk.behavior.IDiskCacheAttributes getDiskCacheAttributes(int maxDiskObjects,
                                                                                                           java.lang.String cachePath,
                                                                                                           java.lang.String cacheName)

removeStaleFiles

private static void removeStaleFiles(java.lang.String basePathPart,
                                     java.lang.String suffix)

deleteCacheFiles

private static void deleteCacheFiles(java.lang.String basePathPart)

getCacheAttributes

private static org.apache.commons.jcs3.engine.CompositeCacheAttributes getCacheAttributes(int maxMemoryElements)