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package com.sun.enterprise.admin.mbeans.custom.loading;
import com.sun.enterprise.admin.mbeans.custom.CMBStrings;
import com.sun.enterprise.admin.server.core.CustomMBeanException;
import com.sun.enterprise.admin.servermgmt.RepositoryConfig;
import com.sun.enterprise.admin.servermgmt.pe.PEFileLayout;
import com.sun.enterprise.util.SystemPropertyConstants;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.io.BufferedInputStream;
import com.sun.enterprise.util.OS;
/** A custom class loader to load the MBeans defined by users. This class-loader delegates
* to system-class-loader, <code> sun.misc.Launcher$AppClassLoader@169e11 for Sun's JRE</code>.
* One instance of this class-loader is created at the startup and it loads the classes from
* a specific location that is passed to it. If the bits of the class that has been loaded
* by this instance of the class are now changed on the disk, a new instance of the class loader
* is first created and that instance of this class-loader loads the new bits giving birth to a new class.
* More about this in the design document.
* @since SJSAS 9.0
*/
public final class MBeanClassLoader extends ClassLoader {
private URL url;
private ClassLoader parent;
/** Creates a new instance of MBeanClassLoader */
/*
public MBeanClassLoader(final URL urlToLoadFrom, final ClassLoader parent) throws IllegalArgumentException {
super(parent);
if (urlToLoadFrom == null || parent == null)
throw new IllegalArgumentException("null arguments"); //TODO
initialize(urlToLoadFrom, parent);
}
public MBeanClassLoader(final File diskFolder, final ClassLoader parent) throws IllegalArgumentException {
super(parent);
if (diskFolder == null)
throw new IllegalArgumentException("null arguments"); //TODO
if (!diskFolder.isDirectory())
throw new IllegalArgumentException("invalid, can load only from a folder"); //TODO
if (!diskFolder.exists())
throw new IllegalArgumentException("invalid, does not exist: " + diskFolder.getPath()); //TODO
if (!diskFolder.canRead())
throw new IllegalArgumentException("invalid, can not read: " + diskFolder.getPath()); //TODO
try {
initialize(diskFolder.toURL());
} catch (final MalformedURLException m) {
throw new IllegalArgumentException(m);
}
}
*/
public MBeanClassLoader() throws CustomMBeanException{
super(MBeanClassLoader.class.getClassLoader());
init();
}
public MBeanClassLoader(final ClassLoader delegatee) throws CustomMBeanException {
super(delegatee);
init();
}
private void init() throws CustomMBeanException{
try {
final File mbf = getDefaultMBeanDirectory();
this.url = mbf.toURL();
} catch (final MalformedURLException m) {
String msg = CMBStrings.get("cmb.classloader.init", m.getLocalizedMessage());
throw new CustomMBeanException(msg, m);
}
}
private File getDefaultMBeanDirectory() {
/* Ideally, PEFileLayout should be utilized here which should be the central place
* to get all these paths, locations. But that is too cryptic to find out. Hence
* I am relying on the properties that are passed to the VM at startup.
* These properties include the SystemPropertyConstants.INSTANCE_ROOT which always
* points to where the server instance or domain configuration is stored.
*/
final File appsFolder = new File(System.getProperty(SystemPropertyConstants.INSTANCE_ROOT_PROPERTY), PEFileLayout.APPLICATIONS_DIR);
return ( new File(appsFolder, PEFileLayout.MBEAN_FOLDER_NAME) );
}
protected Class findClass(final String className) throws ClassNotFoundException {
final byte[] cd = getClassData(className);
if (cd == null)
throw new ClassNotFoundException(CMBStrings.get("findClassFailed", className));
return ( defineClass(className, cd, 0, cd.length) );
}
protected URL findResource(String name)
{
File searchResource = new File(url.getFile(), name);
URL result = null;
if ( searchResource.exists() )
{
try
{
return searchResource.toURL();
}
catch (MalformedURLException mfe)
{
}
}
return result;
}
private byte[] getClassData(final String cn) {
byte[] cd = null;
try {
if(isURLFile()) {
cd = getClassDataFromFile(url.getFile(), cn);
} else {
cd = getClassDataFromURL();
}
} catch(final Exception e) {
// the caller will throw a ClassNotFoundException
}
return ( cd );
}
private boolean isURLFile() {
return ( "file".equals(url.getProtocol()) );
}
private byte[] getClassDataFromFile(final String base, final String cn) throws IOException, FileNotFoundException {
String path = base + '/' + cn.replace('.', '/') + ".class";
path = prunePath(path);
final FileInputStream fis = new FileInputStream(path);
final BufferedInputStream bis = new BufferedInputStream(fis);
final ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] cd = null;
try {
byte[] buf = new byte[1024]; // reading several bytes
int br = bis.read(buf, 0, buf.length);
while (br != -1) {
bos.write(buf, 0, br);
br = bis.read(buf, 0, buf.length);
}
cd = bos.toByteArray();
} catch(final FileNotFoundException fe) {
throw fe;
} catch (final IOException e) {
throw e;
} finally {
try {
//This is the single most important item in loading the classes!
bis.close();
bos.close();
} catch(Throwable t) {}
return ( cd );
}
}
private String prunePath(final String path) {
/* don't know why url.toFile has got a leading '/' on Windows */
if (OS.isWindows() && path.charAt(0) == '/') {
return ( path.substring(1) );
}
else
return ( path ) ;
}
private byte[] getClassDataFromURL() {
throw new UnsupportedOperationException(CMBStrings.get("InternalError", "getClassDataFromURL() -- not implemented yet"));
}
///// Private Methods /////
}
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