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Java Source Code / Java Documentation » Scripting » janino 2.5.11 » org.codehaus.janino

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

java.lang .ClassLoader

org.codehaus.janino .JavaSourceClassLoader

org.codehaus.janino .CachingJavaSourceClassLoader

CachingJavaSourceClassLoader

public class CachingJavaSourceClassLoader extends JavaSourceClassLoader (Code)

A org.codehaus.janino.JavaSourceClassLoader that uses a resource storage provided by the application to cache compiled classes and thus saving unnecessary recompilations.

The application provides access to the resource storeage through a pair of a org.codehaus.janino.util.resource.ResourceFinder and a org.codehaus.janino.util.resource.ResourceCreator (see CachingJavaSourceClassLoader.CachingJavaSourceClassLoader(ClassLoader,ResourceFinder,String,ResourceFinder,ResourceCreator,EnumeratorSet) .

See org.codehaus.janino.JavaSourceClassLoader.main(String[]) for an example how to use this class.

Notice: You must NOT rely on that this class stores some particular data in some particular resources through the given classFileCacheResourceFinder/Creator! These serve only as a means for the CachingJavaSourceClassLoader to persistently cache some data between invocations. In other words: If you want to compile .java files into .class files, then don't use this class but Compiler instead!

Constructor Summary
public	CachingJavaSourceClassLoader(ClassLoader parentClassLoader, File[] optionalSourcePath, String optionalCharacterEncoding, File cacheDirectory, EnumeratorSet debuggingInformation) See CachingJavaSourceClassLoader.CachingJavaSourceClassLoader(ClassLoader,ResourceFinder,String,ResourceFinder,ResourceCreator,EnumeratorSet) .
public	CachingJavaSourceClassLoader(ClassLoader parentClassLoader, ResourceFinder sourceFinder, String optionalCharacterEncoding, ResourceFinder classFileCacheResourceFinder, ResourceCreator classFileCacheResourceCreator, EnumeratorSet debuggingInformation) Notice that this class is thread-safe if and only if the `classFileCacheResourceCreator` stores its data atomically, i.e.

Method Summary
protected Map	generateBytecodes(String className) Override JavaSourceClassLoader.generateBytecodes(String) to implement class file caching.

Constructor Detail

CachingJavaSourceClassLoader
public CachingJavaSourceClassLoader(ClassLoader parentClassLoader, File[] optionalSourcePath, String optionalCharacterEncoding, File cacheDirectory, EnumeratorSet debuggingInformation)(Code)
	See CachingJavaSourceClassLoader.CachingJavaSourceClassLoader(ClassLoader,ResourceFinder,String,ResourceFinder,ResourceCreator,EnumeratorSet) . Parameters: optionalSourcePath - Directories to scan for source files Parameters: cacheDirectory - Directory to use for caching generated class files (see class description)

CachingJavaSourceClassLoader
public CachingJavaSourceClassLoader(ClassLoader parentClassLoader, ResourceFinder sourceFinder, String optionalCharacterEncoding, ResourceFinder classFileCacheResourceFinder, ResourceCreator classFileCacheResourceCreator, EnumeratorSet debuggingInformation)(Code)
	Notice that this class is thread-safe if and only if the `classFileCacheResourceCreator` stores its data atomically, i.e. the `classFileCacheResourceFinder` sees the resource written by the `classFileCacheResourceCreator` only after the OutputStream is closed. In order to make the caching scheme work, both the `classFileCacheResourceFinder` and the `sourceFinder` must support the org.codehaus.janino.util.resource.Resource.lastModified method, so that the modification time of the source and the class files can be compared. Parameters: parentClassLoader - Attempt to load classes through this one before looking for source files Parameters: sourceFinder - Finds Java^TM source for class `pkg.Cls` in resource `pkg/Cls.java` Parameters: optionalCharacterEncoding - Encoding of Java^TM source or `null` for platform default encoding Parameters: classFileCacheResourceFinder - Finds precompiled class `pkg.Cls` in resource `pkg/Cls.class` (see class description) Parameters: classFileCacheResourceCreator - Stores compiled class `pkg.Cls` in resource `pkg/Cls.class` (see class description) Parameters: debuggingInformation - What debugging information to include into the generated class files

Method Detail

generateBytecodes
protected Map generateBytecodes(String className) throws ClassNotFoundException(Code)
	Override JavaSourceClassLoader.generateBytecodes(String) to implement class file caching. String name => byte[] bytecode, or `null` if no source code could be found throws: ClassNotFoundException - on compilation problems or class file cache I/O problems

Fields inherited from org.codehaus.janino.JavaSourceClassLoader

Map precompiledClasses(Code)(Java Doc)

Methods inherited from org.codehaus.janino.JavaSourceClassLoader

protected Class defineBytecode(String className, byte[] ba) throws ClassFormatError(Code)(Java Doc)
protected Class defineBytecodes(String name, Map bytecodes) throws ClassFormatError(Code)(Java Doc)
protected Class findClass(String name) throws ClassNotFoundException(Code)(Java Doc)
protected Map generateBytecodes(String name) throws ClassNotFoundException(Code)(Java Doc)
public static void main(String[] args)(Code)(Java Doc)
public void setCompileErrorHandler(UnitCompiler.ErrorHandler optionalCompileErrorHandler)(Code)(Java Doc)
public void setProtectionDomainFactory(ProtectionDomainFactory protectionDomainFactory)(Code)(Java Doc)
public void setWarningHandler(WarningHandler optionalWarningHandler)(Code)(Java Doc)

Methods inherited from java.lang.ClassLoader

public synchronized void clearAssertionStatus()(Code)(Java Doc)
final protected Class defineClass(byte[] b, int off, int len) throws ClassFormatError(Code)(Java Doc)
final protected Class defineClass(String name, byte[] b, int off, int len) throws ClassFormatError(Code)(Java Doc)
final protected Class defineClass(String name, byte[] b, int off, int len, ProtectionDomain protectionDomain) throws ClassFormatError(Code)(Java Doc)
final protected Class defineClass(String name, java.nio.ByteBuffer b, ProtectionDomain protectionDomain) throws ClassFormatError(Code)(Java Doc)
protected Package definePackage(String name, String specTitle, String specVersion, String specVendor, String implTitle, String implVersion, String implVendor, URL sealBase) throws IllegalArgumentException(Code)(Java Doc)
protected Class findClass(String name) throws ClassNotFoundException(Code)(Java Doc)
protected String findLibrary(String libname)(Code)(Java Doc)
final protected Class findLoadedClass(String name)(Code)(Java Doc)
protected URL findResource(String name)(Code)(Java Doc)
protected Enumeration<URL> findResources(String name) throws IOException(Code)(Java Doc)
final protected Class findSystemClass(String name) throws ClassNotFoundException(Code)(Java Doc)
protected Package getPackage(String name)(Code)(Java Doc)
protected Package[] getPackages()(Code)(Java Doc)
final public ClassLoader getParent()(Code)(Java Doc)
public URL getResource(String name)(Code)(Java Doc)
public InputStream getResourceAsStream(String name)(Code)(Java Doc)
public Enumeration<URL> getResources(String name) throws IOException(Code)(Java Doc)
public static ClassLoader getSystemClassLoader()(Code)(Java Doc)
public static URL getSystemResource(String name)(Code)(Java Doc)
public static InputStream getSystemResourceAsStream(String name)(Code)(Java Doc)
public static Enumeration<URL> getSystemResources(String name) throws IOException(Code)(Java Doc)
public Class loadClass(String name) throws ClassNotFoundException(Code)(Java Doc)
protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException(Code)(Java Doc)
final protected void resolveClass(Class c)(Code)(Java Doc)
public synchronized void setClassAssertionStatus(String className, boolean enabled)(Code)(Java Doc)
public synchronized void setDefaultAssertionStatus(boolean enabled)(Code)(Java Doc)
public synchronized void setPackageAssertionStatus(String packageName, boolean enabled)(Code)(Java Doc)
final protected void setSigners(Class c, Object[] signers)(Code)(Java Doc)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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