Package org.aspectj.weaver.tools.cache

Class DefaultCacheKeyResolver

java.lang.Object

org.aspectj.weaver.tools.cache.DefaultCacheKeyResolver

All Implemented Interfaces:

CacheKeyResolver

public class DefaultCacheKeyResolver
extends Object
implements CacheKeyResolver

Naive default class and classloader hashing implementation useful for some multi-classloader environments.

This implementation creates classloader scopes of the form:
"ExampleClassLoaderName.[crc hash]"

And weaved class keys of the form:
"com.foo.BarClassName.[bytes len][crc].weaved"

And generated class keys of the form:
"com.foo.BarClassName$AjClosure.generated

Field Summary

Fields

Modifier and Type	Field	Description
static final String	GENERATED_SUFFIX
static final String	WEAVED_SUFFIX

Constructor Summary

Constructors

Constructor	Description
DefaultCacheKeyResolver()

Method Summary

Modifier and Type	Method	Description
String	createClassLoaderScope(ClassLoader cl, List<String> aspects)	Create a scope from a set of urls and aspect urls.
CachedClassReference	generatedKey(String className)	Create a key for the given className from a class generated by the weaver such that:
String	getGeneratedRegex()	Return a regex which matches all generated keys
String	getWeavedRegex()	Return a regex which matches all weaved keys;
String	keyToClass(String key)	Converts a cache key back to a className
CachedClassReference	weavedKey(String className, byte[] original_bytes)	Create a key for the given class name and byte array from the pre-weaved class such that

Methods inherited from class java.lang.Object

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

Field Details

GENERATED_SUFFIX

public static final String GENERATED_SUFFIX

See Also:

• Constant Field Values

WEAVED_SUFFIX

public static final String WEAVED_SUFFIX

See Also:

• Constant Field Values

Constructor Details

DefaultCacheKeyResolver

public DefaultCacheKeyResolver()

Method Details

createClassLoaderScope

public String createClassLoaderScope(ClassLoader cl,
 List<String> aspects)

Create a scope from a set of urls and aspect urls. Creates scope of the form "ExampleClassLoaderName.[md5sum]" or "ExampleClassLoaderName.[crc]"

Specified by:

createClassLoaderScope in interface CacheKeyResolver

Parameters:

cl - the classloader which uses the cache, can be null

aspects - the aspects

Returns:

a unique string for URLClassloaders, otherwise a non-unique classname

getGeneratedRegex

public String getGeneratedRegex()

Description copied from interface: CacheKeyResolver

Return a regex which matches all generated keys

Specified by:

getGeneratedRegex in interface CacheKeyResolver

Returns:

string regex

getWeavedRegex

public String getWeavedRegex()

Description copied from interface: CacheKeyResolver

Return a regex which matches all weaved keys;

Specified by:

getWeavedRegex in interface CacheKeyResolver

Returns:

string regex

keyToClass

public String keyToClass(String key)

Converts a cache key back to a className

Specified by:

keyToClass in interface CacheKeyResolver

Parameters:

key - to convert

Returns:

className, e.g. "com.foo.Bar"

weavedKey

public CachedClassReference weavedKey(String className,
 byte[] original_bytes)

Description copied from interface: CacheKeyResolver

Create a key for the given class name and byte array from the pre-weaved class such that

    className == keyToClass(weavedKey(className, various_bytes)) holds
 and
    weavedKey(className, various_bytes).matches(getWeavedRegex()) == true
 

Specified by:

weavedKey in interface CacheKeyResolver

Parameters:

className - class to create a key for

original_bytes - bytes of the pre-weaved class

Returns:

key for the class, or null if no caching should be performed

generatedKey

public CachedClassReference generatedKey(String className)

Description copied from interface: CacheKeyResolver

Create a key for the given className from a class generated by the weaver such that:

    className == keyToClass(generatedKey(className)) holds
 and
    generatedKey(className).matches(getGeneratedRegex()) == true
 

Specified by:

generatedKey in interface CacheKeyResolver

Parameters:

className - class to create a key for

Returns:

key for the class, or null if no caching should be performed