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140 lines
5.1 KiB
Java
140 lines
5.1 KiB
Java
/* Instrumentation.java -- Implementation of this interface is used to
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instrument Java bytecode.
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang.instrument;
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/**
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* An Instrumentation object has transformers that will
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* be called each time a class is defined or redefined.
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* The object is given to a <code>premain</code> function
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* that is called before the <code>main</code> function.
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*
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* @author Nicolas Geoffray (nicolas.geoffray@menlina.com)
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* @since 1.5
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*/
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public interface Instrumentation
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{
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/**
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* Adds a <code>ClassFileTransformer</class> object
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* to the instrumentation. Each time a class is defined
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* or redefined, the <code>transform</code> method of the
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* <code>transformer</code> object is called.
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*
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* @param transformer the transformer to add
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* @throws NullPointerException if transformer is null
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*/
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void addTransformer(ClassFileTransformer transformer);
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/**
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* Removes the given transformer from the set of transformers
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* this Instrumentation object has.
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*
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* @param transformer the transformer to remove
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* @return true if the transformer was found and removed, false if
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* the transformer was not found
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* @throws NullPointerException if transformer is null
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*/
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boolean removeTransformer(ClassFileTransformer transformer);
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/**
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* Returns if the current JVM supports class redefinition
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*
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* @return true if the current JVM supports class redefinition
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*/
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boolean isRedefineClassesSupported();
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/**
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* Redefine classes present in the definitions array, with
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* the corresponding class files.
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*
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* @param definitions an array of classes to redefine
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*
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* @throws ClassNotFoundException if a class cannot be found
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* @throws UnmodifiableClassException if a class cannot be modified
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* @throws UnsupportedOperationException if the JVM does not support
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* redefinition or the redefinition made unsupported changes
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* @throws ClassFormatError if a class file is not valid
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* @throws NoClassDefFoundError if a class name is not equal to the name
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* in the class file specified
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* @throws UnsupportedClassVersionError if the class file version numbers
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* are unsupported
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* @throws ClassCircularityError if circularity occured with the new
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* classes
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* @throws LinkageError if a linkage error occurs
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* @throws NullPointerException if the definitions array is null, or any
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* of its element
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*
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* @see #isRedefineClassesSupported()
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* @see #addTransformer(java.lang.instrument.ClassFileTransformer)
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* @see ClassFileTransformer
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*/
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void redefineClasses(ClassDefinition[] definitions)
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throws ClassNotFoundException,
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UnmodifiableClassException;
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/**
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* Get all the classes loaded by the JVM.
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*
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* @return an array containing all the classes loaded by the JVM. The array
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* is empty if no class is loaded.
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*/
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Class[] getAllLoadedClasses();
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/**
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* Get all the classes loaded by a given class loader
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*
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* @param loader the loader
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*
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* @return an array containing all the classes loaded by the given loader.
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* The array is empty if no class was loaded by the loader.
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*/
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Class[] getInitiatedClasses(ClassLoader loader);
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/**
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* Get the size of an object. It contains the size of all fields.
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*
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* @param objectToSize the object
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* @return the size of the object
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* @throws NullPointerException if objectToSize is null.
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*/
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long getObjectSize(Object objectToSize);
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}
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