org.mozilla.javascript

Class ClassCache

public class ClassCache extends Object

Cache of generated classes and data structures to access Java runtime from JavaScript.

Since: Rhino 1.5 Release 5

Author: Igor Bukanov

Method Summary
booleanassociate(ScriptableObject topScope)
Associate ClassCache object with the given top-level scope.
voidclearCaches()
Empty caches of generated Java classes and Java reflection information.
static ClassCacheget(Scriptable scope)
Search for ClassCache object in the given scope.
booleanisCachingEnabled()
Check if generated Java classes and Java reflection information is cached.
booleanisInvokerOptimizationEnabled()
intnewClassSerialNumber()
Internal engine method to return serial number for generated classes to ensure name uniqueness.
voidsetCachingEnabled(boolean enabled)
Set whether to cache some values.
voidsetInvokerOptimizationEnabled(boolean enabled)

Method Detail

associate

public boolean associate(ScriptableObject topScope)
Associate ClassCache object with the given top-level scope. The ClassCache object can only be associated with the given scope once.

Parameters: topScope scope to associate this ClassCache object with.

Returns: true if no prevous ClassCache objects were embedded into the scope and this ClassCache were successfully associated or false otherwise.

See Also: ClassCache

clearCaches

public void clearCaches()
Empty caches of generated Java classes and Java reflection information.

get

public static ClassCache get(Scriptable scope)
Search for ClassCache object in the given scope. The method first calls {@link ScriptableObject#getTopLevelScope(Scriptable scope)} to get the top most scope and then tries to locate associated ClassCache object in the prototype chain of the top scope.

Parameters: scope scope to search for ClassCache object.

Returns: previously associated ClassCache object or a new instance of ClassCache if no ClassCache object was found.

See Also: ClassCache

isCachingEnabled

public final boolean isCachingEnabled()
Check if generated Java classes and Java reflection information is cached.

isInvokerOptimizationEnabled

public boolean isInvokerOptimizationEnabled()

Deprecated: The method always returns false.

See Also: ClassCache

newClassSerialNumber

public final int newClassSerialNumber()
Internal engine method to return serial number for generated classes to ensure name uniqueness.

setCachingEnabled

public void setCachingEnabled(boolean enabled)
Set whether to cache some values.

By default, the engine will cache the results of Class.getMethods() and similar calls. This can speed execution dramatically, but increases the memory footprint. Also, with caching enabled, references may be held to objects past the lifetime of any real usage.

If caching is enabled and this method is called with a false argument, the caches will be emptied.

Caching is enabled by default.

Parameters: enabled if true, caching is enabled

See Also: clearCaches

setInvokerOptimizationEnabled

public void setInvokerOptimizationEnabled(boolean enabled)

Deprecated: The method does nothing. Invoker optimization is no longer used by Rhino. On modern JDK like 1.4 or 1.5 the disadvatages of the optimization like incresed memory usage or longer initialization time overweight small speed increase that can be gained using generated proxy class to replace reflection.