Class SoftCachingModuleScriptProvider
- java.lang.Object
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- org.mozilla.javascript.commonjs.module.provider.CachingModuleScriptProviderBase
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- org.mozilla.javascript.commonjs.module.provider.SoftCachingModuleScriptProvider
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- All Implemented Interfaces:
java.io.Serializable
,ModuleScriptProvider
public class SoftCachingModuleScriptProvider extends CachingModuleScriptProviderBase
A module script provider that uses a module source provider to load modules and caches the loaded modules. It softly references the loaded modules' RhinoScript
objects, thus a module once loaded can become eligible for garbage collection if it is otherwise unused under memory pressure. Instances of this class are thread safe.- Version:
- $Id: SoftCachingModuleScriptProvider.java,v 1.3 2011/04/07 20:26:12 hannes%helma.at Exp $
- Author:
- Attila Szegedi
- See Also:
- Serialized Form
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Nested Class Summary
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Nested classes/interfaces inherited from class org.mozilla.javascript.commonjs.module.provider.CachingModuleScriptProviderBase
CachingModuleScriptProviderBase.CachedModuleScript
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Constructor Summary
Constructors Constructor Description SoftCachingModuleScriptProvider(ModuleSourceProvider moduleSourceProvider)
Creates a new module provider with the specified module source provider.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected CachingModuleScriptProviderBase.CachedModuleScript
getLoadedModule(java.lang.String moduleId)
Retrieves an already loaded moduleScript stored usingCachingModuleScriptProviderBase.putLoadedModule(String, ModuleScript, Object)
.ModuleScript
getModuleScript(Context cx, java.lang.String moduleId, java.net.URI uri, java.net.URI base, Scriptable paths)
Returns a module script.protected void
putLoadedModule(java.lang.String moduleId, ModuleScript moduleScript, java.lang.Object validator)
Store a loaded module script for later retrieval usingCachingModuleScriptProviderBase.getLoadedModule(String)
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Methods inherited from class org.mozilla.javascript.commonjs.module.provider.CachingModuleScriptProviderBase
getConcurrencyLevel
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Constructor Detail
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SoftCachingModuleScriptProvider
public SoftCachingModuleScriptProvider(ModuleSourceProvider moduleSourceProvider)
Creates a new module provider with the specified module source provider.- Parameters:
moduleSourceProvider
- provider for modules' source code
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Method Detail
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getModuleScript
public ModuleScript getModuleScript(Context cx, java.lang.String moduleId, java.net.URI uri, java.net.URI base, Scriptable paths) throws java.lang.Exception
Description copied from interface:ModuleScriptProvider
Returns a module script. It should attempt to load the module script if it is not already available to it, or return an already loaded module script instance if it is available to it.- Specified by:
getModuleScript
in interfaceModuleScriptProvider
- Overrides:
getModuleScript
in classCachingModuleScriptProviderBase
- Parameters:
cx
- current context. Can be used to compile module scripts.moduleId
- the ID of the module. An implementation must only accept an absolute ID, starting with a term.uri
- the URI of the module. If this is not null, resolution ofmoduleId
is bypassed and the script is directly loaded frommoduleUri
base
- the module path base URI from whichmoduleUri
was derived.paths
- the value of the require() function's "paths" attribute. If the require() function is sandboxed, it will be null, otherwise it will be a JavaScript Array object. It is up to the provider implementation whether and how it wants to honor the contents of the array.- Returns:
- a module script representing the compiled code of the module. Null should be returned if the script could not found.
- Throws:
java.lang.Exception
- if there was an unrecoverable problem obtaining the scriptjava.lang.IllegalArgumentException
- if the module ID is syntactically not a valid absolute module identifier.
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getLoadedModule
protected CachingModuleScriptProviderBase.CachedModuleScript getLoadedModule(java.lang.String moduleId)
Description copied from class:CachingModuleScriptProviderBase
Retrieves an already loaded moduleScript stored usingCachingModuleScriptProviderBase.putLoadedModule(String, ModuleScript, Object)
.- Specified by:
getLoadedModule
in classCachingModuleScriptProviderBase
- Parameters:
moduleId
- the ID of the module- Returns:
- a cached module script, or null if the module is not loaded.
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putLoadedModule
protected void putLoadedModule(java.lang.String moduleId, ModuleScript moduleScript, java.lang.Object validator)
Description copied from class:CachingModuleScriptProviderBase
Store a loaded module script for later retrieval usingCachingModuleScriptProviderBase.getLoadedModule(String)
.- Specified by:
putLoadedModule
in classCachingModuleScriptProviderBase
- Parameters:
moduleId
- the ID of the modulemoduleScript
- the module scriptvalidator
- the validator for the module's source text entity
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