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1715
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1 import java.io.ByteArrayInputStream;
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2 import java.io.FileInputStream;
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3 public class Loader2 extends ClassLoader {
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4 int _recur;
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5 public void print( String msg ) {
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6 for( int i=0; i<_recur; i++ )
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7 System.out.print(" ");
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8 System.out.println(">>Loader2>> "+msg);
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9 }
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10
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11 protected Class findClass2(String name) throws ClassNotFoundException {
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12 print("Fetching the implementation of "+name);
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13 int old = _recur;
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14 try {
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15 FileInputStream fi = new FileInputStream(name+".impl2");
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16 byte result[] = new byte[fi.available()];
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17 fi.read(result);
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18
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19 print("DefineClass1 on "+name);
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20 _recur++;
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21 Class clazz = defineClass(name, result, 0, result.length);
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22 _recur = old;
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23 print("Returning newly loaded class.");
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24 return clazz;
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25 } catch (Exception e) {
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26 _recur = old;
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27 print("Not found on disk.");
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28 // If we caught an exception, either the class was not found or
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29 // it was unreadable by our process.
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30 return null;
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31 //throw new ClassNotFoundException(e.toString());
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32 }
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33 }
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34
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35 protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
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36 // Attempt a disk load first
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37 Class c = findClass2(name);
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38 if( c == null ) {
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39 // check if the class has already been loaded
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40 print("Checking for prior loaded class "+name);
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41 c = findLoadedClass(name);
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42 print("Letting super-loader load "+name);
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43 int old = _recur;
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44 _recur++;
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45 c = super.loadClass(name, false);
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46 _recur=old;
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47 }
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48 if (resolve) { print("Resolving class "+name); resolveClass(c); }
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49 print("Returning clazz "+c.getClassLoader()+":"+name);
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50 return c;
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51 }
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52 }
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