| import java.io.ByteArrayInputStream; |
| import java.io.FileInputStream; |
| public class Loader2 extends ClassLoader { |
| int _recur; |
| public void print( String msg ) { |
| for( int i=0; i<_recur; i++ ) |
| System.out.print(" "); |
| System.out.println(">>Loader2>> "+msg); |
| } |
| |
| protected Class findClass2(String name) throws ClassNotFoundException { |
| print("Fetching the implementation of "+name); |
| int old = _recur; |
| try { |
| FileInputStream fi = new FileInputStream(name+".impl2"); |
| byte result[] = new byte[fi.available()]; |
| fi.read(result); |
| |
| print("DefineClass1 on "+name); |
| _recur++; |
| Class clazz = defineClass(name, result, 0, result.length); |
| _recur = old; |
| print("Returning newly loaded class."); |
| return clazz; |
| } catch (Exception e) { |
| _recur = old; |
| print("Not found on disk."); |
| // If we caught an exception, either the class was not found or |
| // it was unreadable by our process. |
| return null; |
| //throw new ClassNotFoundException(e.toString()); |
| } |
| } |
| |
| protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException { |
| // Attempt a disk load first |
| Class c = findClass2(name); |
| if( c == null ) { |
| // check if the class has already been loaded |
| print("Checking for prior loaded class "+name); |
| c = findLoadedClass(name); |
| print("Letting super-loader load "+name); |
| int old = _recur; |
| _recur++; |
| c = super.loadClass(name, false); |
| _recur=old; |
| } |
| if (resolve) { print("Resolving class "+name); resolveClass(c); } |
| print("Returning clazz "+c.getClassLoader()+":"+name); |
| return c; |
| } |
| } |