groovy.lang

Class GroovyClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

groovy.lang.GroovyClassLoader

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

GroovyClassLoader.InnerLoader

public class GroovyClassLoader
extends URLClassLoader

A ClassLoader which can load Groovy classes. The loaded classes are cached, classes from other classloaders should not be cached. To be able to load a script that was asked for earlier but was created later it is essential not to keep anything like a "class not found" information for that class name. This includes possible parent loaders. Classes that are not cached are always reloaded.

Version:

$Revision$

Author:

James Strachan, Guillaume Laforge, Steve Goetze, Bing Ran, Scott Stirling, Jochen Theodorou

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	GroovyClassLoader.ClassCollector
static class	GroovyClassLoader.InnerLoader

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<String,Class>	classCache this cache contains the loaded classes or PARSING, if the class is currently parsed
protected Map<String,Class>	sourceCache This cache contains mappings of file name to class.

Constructor Summary

Constructors

Constructor and Description
GroovyClassLoader() creates a GroovyClassLoader using the current Thread's context Class loader as parent.
GroovyClassLoader(ClassLoader loader) creates a GroovyClassLoader using the given ClassLoader as parent
GroovyClassLoader(ClassLoader loader, CompilerConfiguration config) creates a GroovyClassLoader using the given ClassLoader as parent.
GroovyClassLoader(ClassLoader parent, CompilerConfiguration config, boolean useConfigurationClasspath) creates a GroovyClassLoader.
GroovyClassLoader(GroovyClassLoader parent) creates a GroovyClassLoader using the given GroovyClassLoader as parent.

Method Summary

Methods

Modifier and Type	Method and Description
void	addClasspath(String path) adds a classpath to this classloader.
void	addURL(URL url) adds a URL to the classloader.
void	clearCache() Removes all classes from the class cache.
protected GroovyClassLoader.ClassCollector	createCollector(CompilationUnit unit, SourceUnit su) creates a ClassCollector for a new compilation.
protected CompilationUnit	createCompilationUnit(CompilerConfiguration config, CodeSource source) creates a new CompilationUnit.
Class	defineClass(ClassNode classNode, String file, String newCodeBase) Loads the given class node returning the implementation Class.
Class	defineClass(String name, byte[] b) open up the super class define that takes raw bytes
String	generateScriptName()
protected Class	getClassCacheEntry(String name) gets a class from the class cache.
protected String[]	getClassPath() gets the currently used classpath.
Class[]	getLoadedClasses() Returns all Groovy classes loaded by this class loader.
protected PermissionCollection	getPermissions(CodeSource codeSource)
GroovyResourceLoader	getResourceLoader()
protected long	getTimeStamp(Class cls) gets the time stamp of a given class.
protected boolean	isRecompilable(Class cls) Indicates if a class is recompilable.
Boolean	isShouldRecompile() gets the currently set recompilation mode.
protected boolean	isSourceNewer(URL source, Class cls) Decides if the given source is newer than a class.
Class<?>	loadClass(String name)
protected Class	loadClass(String name, boolean resolve) Implemented here to check package access prior to returning an already loaded class.
Class	loadClass(String name, boolean lookupScriptFiles, boolean preferClassOverScript) loads a class from a file or a parent classloader.
Class	loadClass(String name, boolean lookupScriptFiles, boolean preferClassOverScript, boolean resolve) loads a class from a file or a parent classloader.
Class	parseClass(File file) Parses the given file into a Java class capable of being run
Class	parseClass(GroovyCodeSource codeSource)
Class	parseClass(GroovyCodeSource codeSource, boolean shouldCacheSource) Parses the given code source into a Java class.
Class	parseClass(InputStream in, String fileName) Deprecated. Prefer using methods taking a Reader rather than an InputStream to avoid wrong encoding issues.
Class	parseClass(String text) Parses the given text into a Java class capable of being run
Class	parseClass(String text, String fileName) Parses the given text into a Java class capable of being run
protected Class	recompile(URL source, String className, Class oldClass) (Re)Compiles the given source.
protected void	removeClassCacheEntry(String name) removes a class from the class cache.
protected void	setClassCacheEntry(Class cls) sets an entry in the class cache.
void	setResourceLoader(GroovyResourceLoader resourceLoader)
void	setShouldRecompile(Boolean mode) sets if the recompilation should be enable.

Methods inherited from class java.net.URLClassLoader

close, definePackage, findClass, findResource, findResources, getResourceAsStream, getURLs, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass, defineClass

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getResource, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

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

Field Detail

classCache

protected final Map<String,Class> classCache

this cache contains the loaded classes or PARSING, if the class is currently parsed

sourceCache

protected final Map<String,Class> sourceCache

This cache contains mappings of file name to class. It is used to bypass compilation.

Constructor Detail

GroovyClassLoader

public GroovyClassLoader()

creates a GroovyClassLoader using the current Thread's context Class loader as parent.

GroovyClassLoader

public GroovyClassLoader(ClassLoader loader)

creates a GroovyClassLoader using the given ClassLoader as parent

GroovyClassLoader

public GroovyClassLoader(GroovyClassLoader parent)

creates a GroovyClassLoader using the given GroovyClassLoader as parent. This loader will get the parent's CompilerConfiguration

GroovyClassLoader

public GroovyClassLoader(ClassLoader parent,
                 CompilerConfiguration config,
                 boolean useConfigurationClasspath)

creates a GroovyClassLoader.

Parameters:

parent - the parent class loader

config - the compiler configuration

useConfigurationClasspath - determines if the configurations classpath should be added

GroovyClassLoader

public GroovyClassLoader(ClassLoader loader,
                 CompilerConfiguration config)

creates a GroovyClassLoader using the given ClassLoader as parent.

Method Detail

setResourceLoader

public void setResourceLoader(GroovyResourceLoader resourceLoader)

getResourceLoader

public GroovyResourceLoader getResourceLoader()

defineClass

public Class defineClass(ClassNode classNode,
                String file,
                String newCodeBase)

Loads the given class node returning the implementation Class.

WARNING: this compilation is not synchronized

Parameters:

classNode -

Returns:

a class

parseClass

public Class parseClass(File file)
                 throws CompilationFailedException,
                        IOException

Parses the given file into a Java class capable of being run

Parameters:

file - the file name to parse

Returns:

the main class defined in the given script

Throws:

CompilationFailedException

IOException

parseClass

public Class parseClass(String text,
               String fileName)
                 throws CompilationFailedException

Parses the given text into a Java class capable of being run

Parameters:

text - the text of the script/class to parse

fileName - the file name to use as the name of the class

Returns:

the main class defined in the given script

Throws:

CompilationFailedException

parseClass

public Class parseClass(String text)
                 throws CompilationFailedException

Parses the given text into a Java class capable of being run

Parameters:

text - the text of the script/class to parse

Returns:

the main class defined in the given script

Throws:

CompilationFailedException

generateScriptName

public String generateScriptName()

parseClass

public Class parseClass(InputStream in,
               String fileName)
                 throws CompilationFailedException

Deprecated. Prefer using methods taking a Reader rather than an InputStream to avoid wrong encoding issues.

Throws:

CompilationFailedException

parseClass

public Class parseClass(GroovyCodeSource codeSource)
                 throws CompilationFailedException

Throws:

CompilationFailedException

parseClass

public Class parseClass(GroovyCodeSource codeSource,
               boolean shouldCacheSource)
                 throws CompilationFailedException

Parses the given code source into a Java class. If there is a class file for the given code source, then no parsing is done, instead the cached class is returned.

Parameters:

shouldCacheSource - if true then the generated class will be stored in the source cache

Returns:

the main class defined in the given script

Throws:

CompilationFailedException

getClassPath

protected String[] getClassPath()

gets the currently used classpath.

Returns:

a String[] containing the file information of the urls

See Also:

URLClassLoader.getURLs()

getPermissions

protected PermissionCollection getPermissions(CodeSource codeSource)

Overrides:

getPermissions in class URLClassLoader

createCompilationUnit

protected CompilationUnit createCompilationUnit(CompilerConfiguration config,
                                    CodeSource source)

creates a new CompilationUnit. If you want to add additional phase operations to the CompilationUnit (for example to inject additional methods, variables, fields), then you should overwrite this method.

Parameters:

config - the compiler configuration, usually the same as for this class loader

source - the source containing the initial file to compile, more files may follow during compilation

Returns:

the CompilationUnit

createCollector

protected GroovyClassLoader.ClassCollector createCollector(CompilationUnit unit,
                                               SourceUnit su)

creates a ClassCollector for a new compilation.

Parameters:

unit - the compilationUnit

su - the SourceUnit

Returns:

the ClassCollector

defineClass

public Class defineClass(String name,
                byte[] b)

open up the super class define that takes raw bytes

loadClass

public Class loadClass(String name,
              boolean lookupScriptFiles,
              boolean preferClassOverScript)
                throws ClassNotFoundException,
                       CompilationFailedException

loads a class from a file or a parent classloader. This method does call loadClass(String, boolean, boolean, boolean) with the last parameter set to false.

Throws:

CompilationFailedException - if compilation was not successful

ClassNotFoundException

getClassCacheEntry

protected Class getClassCacheEntry(String name)

gets a class from the class cache. This cache contains only classes loaded through this class loader or an InnerLoader instance. If no class is stored for a specific name, then the method should return null.

Parameters:

name - of the class

Returns:

the class stored for the given name

See Also:

removeClassCacheEntry(String), setClassCacheEntry(Class), clearCache()

setClassCacheEntry

protected void setClassCacheEntry(Class cls)

sets an entry in the class cache.

Parameters:

cls - the class

See Also:

removeClassCacheEntry(String), getClassCacheEntry(String), clearCache()

removeClassCacheEntry

protected void removeClassCacheEntry(String name)

removes a class from the class cache.

Parameters:

name - of the class

See Also:

getClassCacheEntry(String), setClassCacheEntry(Class), clearCache()

addURL

public void addURL(URL url)

adds a URL to the classloader.

Overrides:

addURL in class URLClassLoader

Parameters:

url - the new classpath element

isRecompilable

protected boolean isRecompilable(Class cls)

Indicates if a class is recompilable. Recompilable means, that the classloader will try to locate a groovy source file for this class and then compile it again, adding the resulting class as entry to the cache. Giving null as class is like a recompilation, so the method should always return true here. Only classes that are implementing GroovyObject are compilable and only if the timestamp in the class is lower than Long.MAX_VALUE.

NOTE: First the parent loaders will be asked and only if they don't return a class the recompilation will happen. Recompilation also only happen if the source file is newer.

Parameters:

cls - the class to be tested. If null the method should return true

Returns:

true if the class should be compiled again

See Also:

isSourceNewer(URL, Class)

setShouldRecompile

public void setShouldRecompile(Boolean mode)

sets if the recompilation should be enable. There are 3 possible values for this. Any value different than null overrides the value from the compiler configuration. true means to recompile if needed false means to never recompile.

Parameters:

mode - the recompilation mode

See Also:

CompilerConfiguration

isShouldRecompile

public Boolean isShouldRecompile()

gets the currently set recompilation mode. null means, the compiler configuration is used. False means no recompilation and true means that recompilation will be done if needed.

Returns:

the recompilation mode

loadClass

public Class loadClass(String name,
              boolean lookupScriptFiles,
              boolean preferClassOverScript,
              boolean resolve)
                throws ClassNotFoundException,
                       CompilationFailedException

loads a class from a file or a parent classloader.

Parameters:

name - of the class to be loaded

lookupScriptFiles - if false no lookup at files is done at all

preferClassOverScript - if true the file lookup is only done if there is no class

resolve - see ClassLoader.loadClass(java.lang.String, boolean)

Returns:

the class found or the class created from a file lookup

Throws:

ClassNotFoundException - if the class could not be found

CompilationFailedException - if the source file could not be compiled

recompile

protected Class recompile(URL source,
              String className,
              Class oldClass)
                   throws CompilationFailedException,
                          IOException

(Re)Compiles the given source. This method starts the compilation of a given source, if the source has changed since the class was created. For this isSourceNewer is called.

Parameters:

source - the source pointer for the compilation

className - the name of the class to be generated

oldClass - a possible former class

Returns:

the old class if the source wasn't new enough, the new class else

Throws:

CompilationFailedException - if the compilation failed

IOException - if the source is not readable

See Also:

isSourceNewer(URL, Class)

loadClass

public Class<?> loadClass(String name)
                   throws ClassNotFoundException

Overrides:

loadClass in class ClassLoader

Throws:

ClassNotFoundException

loadClass

protected Class loadClass(String name,
              boolean resolve)
                   throws ClassNotFoundException

Implemented here to check package access prior to returning an already loaded class.

Overrides:

loadClass in class ClassLoader

Throws:

CompilationFailedException - if the compilation failed

ClassNotFoundException - if the class was not found

See Also:

ClassLoader.loadClass(java.lang.String, boolean)

getTimeStamp

protected long getTimeStamp(Class cls)

gets the time stamp of a given class. For groovy generated classes this usually means to return the value of the static field __timeStamp. If the parameter doesn't have such a field, then Long.MAX_VALUE is returned

Parameters:

cls - the class

Returns:

the time stamp

isSourceNewer

protected boolean isSourceNewer(URL source,
                    Class cls)
                         throws IOException

Decides if the given source is newer than a class.

Parameters:

source - the source we may want to compile

cls - the former class

Returns:

true if the source is newer, false else

Throws:

IOException - if it is not possible to open an connection for the given source

See Also:

getTimeStamp(Class)

addClasspath

public void addClasspath(String path)

adds a classpath to this classloader.

Parameters:

path - is a jar file or a directory.

See Also:

addURL(URL)

getLoadedClasses

public Class[] getLoadedClasses()

Returns all Groovy classes loaded by this class loader.

Returns:

all classes loaded by this class loader

clearCache

public void clearCache()

Removes all classes from the class cache.

See Also:

getClassCacheEntry(String), setClassCacheEntry(Class), removeClassCacheEntry(String)