Package org.aspectj.weaver.tools.cache

Class DefaultFileCacheBacking

java.lang.Object

org.aspectj.weaver.tools.cache.AbstractCacheBacking

org.aspectj.weaver.tools.cache.AbstractFileCacheBacking

org.aspectj.weaver.tools.cache.AbstractIndexedFileCacheBacking

org.aspectj.weaver.tools.cache.DefaultFileCacheBacking

All Implemented Interfaces:

CacheBacking

public class DefaultFileCacheBacking
extends AbstractIndexedFileCacheBacking

Naive File-Backed Class Cache with no expiry or application centric invalidation.

Enabled with the system property, "aj.weaving.cache.dir" If this system property is not set, no caching will be performed.

A CRC checksum is stored alongside the class file to verify the bytes on read. If for some reason there is an error reading either the class or crc file, or if the crc does not match the class data the cache entry is deleted.

An alternate implementation of this could store the class file as a jar/zip directly, which would have the required crc; as a first pass however it is somewhat useful to view these files in expanded form for debugging.

Nested Class Summary

Nested classes/interfaces inherited from class org.aspectj.weaver.tools.cache.AbstractIndexedFileCacheBacking

AbstractIndexedFileCacheBacking.IndexEntry

Field Summary

Fields inherited from class org.aspectj.weaver.tools.cache.AbstractIndexedFileCacheBacking

EMPTY_INDEX, EMPTY_KEYS, INDEX_FILE

Fields inherited from class org.aspectj.weaver.tools.cache.AbstractFileCacheBacking

WEAVED_CLASS_CACHE_DIR

Fields inherited from class org.aspectj.weaver.tools.cache.AbstractCacheBacking

logger

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DefaultFileCacheBacking(File cacheDir)

Method Summary

Modifier and Type	Method	Description
void	clear()	Clear the entire cache
static final DefaultFileCacheBacking	createBacking(File cacheDir)
static CacheBacking	createBacking(String scope)
protected void	delete(File file)
CachedClassEntry	get(CachedClassReference ref, byte[] originalBytes)	Get a cache entry
protected Map<String,AbstractIndexedFileCacheBacking.IndexEntry>	getIndex()
String[]	getKeys(String regex)	Return a list of keys which match the given regex.
void	put(CachedClassEntry entry, byte[] originalBytes)	Put an entry in the cache
protected byte[]	read(File file, long expectedCRC)
protected Map<String,AbstractIndexedFileCacheBacking.IndexEntry>	readIndex()
void	remove(CachedClassReference ref)	Remove an entry from the cache
protected AbstractIndexedFileCacheBacking.IndexEntry	resolveIndexMapEntry(File cacheDir, AbstractIndexedFileCacheBacking.IndexEntry ie)
protected long	write(File file, byte[] bytes)
protected void	writeIndex()

Methods inherited from class org.aspectj.weaver.tools.cache.AbstractIndexedFileCacheBacking

createIndexEntry, getIndexFile, readIndex, readIndex, writeIndex, writeIndex, writeIndex, writeIndex

Methods inherited from class org.aspectj.weaver.tools.cache.AbstractFileCacheBacking

close, close, getCacheDirectory, writeClassBytes

Methods inherited from class org.aspectj.weaver.tools.cache.AbstractCacheBacking

crc

Methods inherited from class java.lang.Object

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

Constructor Details

DefaultFileCacheBacking

protected DefaultFileCacheBacking(File cacheDir)

Method Details

createBacking

public static final DefaultFileCacheBacking createBacking(File cacheDir)

getIndex

protected Map<String,AbstractIndexedFileCacheBacking.IndexEntry> getIndex()

Specified by:

getIndex in class AbstractIndexedFileCacheBacking

resolveIndexMapEntry

protected AbstractIndexedFileCacheBacking.IndexEntry resolveIndexMapEntry(File cacheDir,
 AbstractIndexedFileCacheBacking.IndexEntry ie)

Overrides:

resolveIndexMapEntry in class AbstractIndexedFileCacheBacking

readIndex

protected Map<String,AbstractIndexedFileCacheBacking.IndexEntry> readIndex()

Overrides:

readIndex in class AbstractIndexedFileCacheBacking

writeIndex

protected void writeIndex()

Overrides:

writeIndex in class AbstractIndexedFileCacheBacking

clear

public void clear()

Description copied from interface: CacheBacking

Clear the entire cache

createBacking

public static CacheBacking createBacking(String scope)

getKeys

public String[] getKeys(String regex)

Description copied from interface: CacheBacking

Return a list of keys which match the given regex.

Specified by:

getKeys in interface CacheBacking

Overrides:

getKeys in class AbstractIndexedFileCacheBacking

Parameters:

regex -

Returns:

get

public CachedClassEntry get(CachedClassReference ref,
 byte[] originalBytes)

Description copied from interface: CacheBacking

Get a cache entry

Parameters:

ref - entry to retrieve

originalBytes - Pre-weaving class bytes - required in order to ensure that the cached entry refers to the same original class

Returns:

the cached bytes or null, if the entry does not exist

put

public void put(CachedClassEntry entry,
 byte[] originalBytes)

Description copied from interface: CacheBacking

Put an entry in the cache

Parameters:

entry - key of the entry

originalBytes - Pre-weaving class bytes - required in order to ensure that the cached entry refers to the same original class

remove

public void remove(CachedClassReference ref)

Description copied from interface: CacheBacking

Remove an entry from the cache

Parameters:

ref -

delete

protected void delete(File file)

Overrides:

delete in class AbstractFileCacheBacking

read

protected byte[] read(File file,
 long expectedCRC)

write

protected long write(File file,
 byte[] bytes)