/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.boot;
import java.io.IOException;
import java.security.CodeSource;
import java.security.SecureClassLoader;
import com.caucho.server.util.CauchoSystem;
import com.caucho.vfs.JarPath;
import com.caucho.vfs.Path;
import com.caucho.vfs.ReadStream;
/**
* Class loader which checks for changes in class files and automatically
* picks up new jars.
*
* <p>DynamicClassLoaders can be chained creating one virtual class loader.
* From the perspective of the JDK, it's all one classloader. Internally,
* the class loader chain searches like a classpath.
*/
class ProLoader extends SecureClassLoader
{
private Path _resinHome;
private Path _libexec;
private JarPath _resinJar;
/**
* Create a new class loader.
*
* @param parent parent class loader
*/
private ProLoader(Path resinHome, boolean is64bit)
{
super(ClassLoader.getSystemClassLoader());
_resinHome = resinHome;
if (is64bit)
_libexec = _resinHome.lookup("libexec64");
else
_libexec = _resinHome.lookup("libexec");
_resinJar = JarPath.create(_resinHome.lookup("lib/resin.jar"));
}
static ProLoader create(Path resinHome, boolean is64bit)
{
if (resinHome.lookup("lib/resin.jar").canRead())
return new ProLoader(resinHome, is64bit);
else
return null;
}
/**
* Load a class using this class loader
*
* @param name the classname to load
* @param resolve if true, resolve the class
*
* @return the loaded classes
*/
@Override
protected Class<?> loadClass(String name, boolean resolve)
throws ClassNotFoundException
{
String className = name.replace('.', '/') + ".class";
Path path = _resinJar.lookup(className);
int length = (int) path.getLength();
if (length > 0
&& (className.startsWith("com/caucho/bootjni")
|| className.equals("com/caucho/vfs/JniFileStream.class")
|| className.equals("com/caucho/vfs/JniServerSocketImpl.class"))) {
byte []buffer = new byte[length];
try {
ReadStream is = null;
try {
is = path.openRead();
is.readAll(buffer, 0, buffer.length);
Class<?> cl = defineClass(name, buffer, 0, buffer.length,
(CodeSource) null);
return cl;
} finally {
is.close();
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
return super.loadClass(name, resolve);
}
/**
* Load a class using this class loader
*
* @param name the classname using either '/' or '.'
*
* @return the loaded class
*/
@Override
protected Class<?> findClass(String name)
throws ClassNotFoundException
{
return super.findClass(name);
}
/**
* Returns the full library path for the name.
*/
@Override
public String findLibrary(String name)
{
Path path = _libexec.lookup("lib" + name + ".so");
if (path.canRead()) {
return path.getNativePath();
}
path = _libexec.lookup("lib" + name + ".jnilib");
if (path.canRead()) {
return path.getNativePath();
}
return super.findLibrary(name);
}
}