Clover coverage report - classworlds - 1.1-alpha-1
Coverage timestamp: Sun Sep 19 2004 14:08:44 EDT
file stats: LOC: 293   Methods: 9
NCLOC: 131   Classes: 1
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 Source file Conditionals Statements Methods TOTAL
EmbeddedLauncher.java 0% 0% 0% 0%
coverage
 1   
 package org.codehaus.classworlds;
 2   
 
 3   
 /*
 4   
  $Id: EmbeddedLauncher.java,v 1.1.1.1 2004/07/01 13:59:19 jvanzyl Exp $
 5   
 
 6   
  Copyright 2002 (C) The Werken Company. All Rights Reserved.
 7   
  
 8   
  Redistribution and use of this software and associated documentation
 9   
  ("Software"), with or without modification, are permitted provided
 10   
  that the following conditions are met:
 11   
 
 12   
  1. Redistributions of source code must retain copyright
 13   
     statements and notices.  Redistributions must also contain a
 14   
     copy of this document.
 15   
  
 16   
  2. Redistributions in binary form must reproduce the
 17   
     above copyright notice, this list of conditions and the
 18   
     following disclaimer in the documentation and/or other
 19   
     materials provided with the distribution.
 20   
  
 21   
  3. The name "classworlds" must not be used to endorse or promote
 22   
     products derived from this Software without prior written
 23   
     permission of The Werken Company.  For written permission,
 24   
     please contact bob@werken.com.
 25   
  
 26   
  4. Products derived from this Software may not be called "classworlds"
 27   
     nor may "classworlds" appear in their names without prior written
 28   
     permission of The Werken Company. "classworlds" is a registered
 29   
     trademark of The Werken Company.
 30   
  
 31   
  5. Due credit should be given to The Werken Company.
 32   
     (http://classworlds.werken.com/).
 33   
  
 34   
  THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS
 35   
  ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 36   
  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 37   
  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 38   
  THE WERKEN COMPANY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 39   
  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 40   
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 41   
  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 42   
  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 43   
  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 44   
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 45   
  OF THE POSSIBILITY OF SUCH DAMAGE.
 46   
  
 47   
  */
 48   
 
 49   
 import java.io.FileInputStream;
 50   
 import java.io.InputStream;
 51   
 import java.lang.reflect.InvocationTargetException;
 52   
 import java.lang.reflect.Method;
 53   
 import java.lang.reflect.Modifier;
 54   
 
 55   
 /**
 56   
  * Command-line invokable application launcher.
 57   
  * <p/>
 58   
  * <p/>
 59   
  * This launcher class assists in the creation of classloaders and <code>ClassRealm</code>s
 60   
  * from a configuration file and the launching of the application's <code>main</code>
 61   
  * method from the correct class loaded through the correct classloader.
 62   
  * </p>
 63   
  * <p/>
 64   
  * <p/>
 65   
  * The path to the configuration file is specified using the <code>classworlds.conf</code>
 66   
  * system property, typically specified using the <code>-D</code> switch to
 67   
  * <code>java</code>.
 68   
  * </p>
 69   
  *
 70   
  * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
 71   
  * @version $Id: EmbeddedLauncher.java,v 1.1.1.1 2004/07/01 13:59:19 jvanzyl Exp $
 72   
  */
 73   
 public class EmbeddedLauncher
 74   
     extends Launcher
 75   
 {
 76   
     private static String LAUNCH_METHOD = "execute";
 77   
 
 78  0
     public EmbeddedLauncher()
 79   
     {
 80  0
         super();
 81   
     }
 82   
 
 83   
     // ------------------------------------------------------------
 84   
     //     Instance methods
 85   
     // ------------------------------------------------------------
 86   
 
 87   
     /**
 88   
      * Set the application's main entrypoint.
 89   
      *
 90   
      * @param mainClassName The main class name.
 91   
      * @param mainRealmName The realm to load the class from.
 92   
      */
 93  0
     public void setAppMain( String mainClassName,
 94   
                             String mainRealmName )
 95   
     {
 96  0
         this.mainClassName = mainClassName;
 97  0
         this.mainRealmName = mainRealmName;
 98   
     }
 99   
 
 100   
     /**
 101   
      * Retrieve the main entry realm name.
 102   
      *
 103   
      * @return The main entry realm name.
 104   
      */
 105  0
     public String getMainRealmName()
 106   
     {
 107  0
         return this.mainRealmName;
 108   
     }
 109   
 
 110   
     /**
 111   
      * Retrieve the main entry class name.
 112   
      *
 113   
      * @return The main entry class name.
 114   
      */
 115  0
     public String getMainClassName()
 116   
     {
 117  0
         return this.mainClassName;
 118   
     }
 119   
 
 120   
     /**
 121   
      * Retrieve the main entry class.
 122   
      *
 123   
      * @return The main entry class.
 124   
      * @throws ClassNotFoundException If the class cannot be found.
 125   
      * @throws NoSuchRealmException   If the specified main entry realm does not exist.
 126   
      */
 127  0
     public Class getMainClass()
 128   
         throws ClassNotFoundException, NoSuchRealmException
 129   
     {
 130  0
         return getMainRealm().loadClass( getMainClassName() );
 131   
     }
 132   
 
 133   
     /**
 134   
      * Retrieve the main entry realm.
 135   
      *
 136   
      * @return The main entry realm.
 137   
      * @throws NoSuchRealmException If the specified main entry realm does not exist.
 138   
      */
 139  0
     public ClassRealm getMainRealm()
 140   
         throws NoSuchRealmException
 141   
     {
 142  0
         return getWorld().getRealm( getMainRealmName() );
 143   
     }
 144   
 
 145   
     /**
 146   
      * Retrieve the enhanced main entry method.
 147   
      *
 148   
      * @return The enhanced main entry method.
 149   
      * @throws ClassNotFoundException If the main entry class cannot be found.
 150   
      * @throws NoSuchMethodException  If the main entry method cannot be found.
 151   
      * @throws NoSuchRealmException   If the main entry realm cannot be found.
 152   
      */
 153  0
     protected Method getEnhancedMainMethod()
 154   
         throws ClassNotFoundException, NoSuchMethodException, NoSuchRealmException
 155   
     {
 156  0
         Method[] methods = getMainClass().getMethods();
 157   
 
 158  0
         for ( int i = 0; i < methods.length; ++i )
 159   
         {
 160  0
             final Method method = methods[i];
 161   
 
 162  0
             if ( !LAUNCH_METHOD.equals( method.getName() ) )
 163   
             {
 164  0
                 continue;
 165   
             }
 166   
 
 167  0
             int modifiers = method.getModifiers();
 168   
 
 169  0
             if ( !( Modifier.isPublic( modifiers ) ) )
 170   
             {
 171  0
                 continue;
 172   
             }
 173   
 
 174  0
             if ( method.getReturnType() != Void.TYPE )
 175   
             {
 176  0
                 continue;
 177   
             }
 178   
 
 179  0
             Class[] paramTypes = method.getParameterTypes();
 180   
 
 181  0
             if ( paramTypes.length != 2 )
 182   
             {
 183  0
                 continue;
 184   
             }
 185   
 
 186  0
             if ( paramTypes[0] != String[].class )
 187   
             {
 188  0
                 continue;
 189   
             }
 190   
 
 191  0
             if ( paramTypes[1] != ClassWorld.class )
 192   
             {
 193  0
                 continue;
 194   
             }
 195   
 
 196  0
             return method;
 197   
         }
 198   
 
 199  0
         throw new NoSuchMethodException( "public void execute(ClassWorld world)" );
 200   
     }
 201   
 
 202   
     /**
 203   
      * Attempt to launch the application through the enhanced main method.
 204   
      * <p/>
 205   
      * <p/>
 206   
      * This will seek a method with the exact signature of:
 207   
      * </p>
 208   
      * <p/>
 209   
      * <pre>
 210   
      *  public static void main(String[] args, ClassWorld world)
 211   
      *  </pre>
 212   
      *
 213   
      * @throws ClassNotFoundException If the main entry class cannot be found.
 214   
      * @throws IllegalAccessException If the method cannot be accessed.
 215   
      * @throws java.lang.reflect.InvocationTargetException
 216   
      *                                If the target of the invokation is
 217   
      *                                invalid.
 218   
      * @throws NoSuchMethodException  If the main entry method cannot be found.
 219   
      * @throws NoSuchRealmException   If the main entry realm cannot be found.
 220   
      */
 221  0
     protected void launchX()
 222   
         throws ClassNotFoundException, IllegalAccessException,
 223   
         InvocationTargetException, NoSuchMethodException, NoSuchRealmException
 224   
     {
 225  0
         ClassRealm mainRealm = getMainRealm();
 226  0
         Class mainClass = getMainClass();
 227  0
         Method mainMethod = getEnhancedMainMethod();
 228   
 
 229  0
         Thread.currentThread().setContextClassLoader( mainRealm.getClassLoader() );
 230   
 
 231  0
         mainMethod.invoke( mainClass, new Object[]{getWorld()} );
 232   
     }
 233   
 
 234   
     // ------------------------------------------------------------
 235   
     //     Class methods
 236   
     // ------------------------------------------------------------
 237   
 
 238  0
     public void launch()
 239   
         throws Exception
 240   
     {
 241  0
         String classworldsConf = System.getProperty( CLASSWORLDS_CONF );
 242   
 
 243  0
         InputStream is = null;
 244   
 
 245  0
         if ( classworldsConf != null )
 246   
         {
 247  0
             is = new FileInputStream( classworldsConf );
 248   
         }
 249   
         else
 250   
         {
 251  0
             ClassLoader cl = Thread.currentThread().getContextClassLoader();
 252   
 
 253  0
             if ( "true".equals( System.getProperty( "classworlds.bootstrapped" ) ) )
 254   
             {
 255  0
                 is = cl.getResourceAsStream( UBERJAR_CONF_DIR + CLASSWORLDS_CONF );
 256   
             }
 257   
             else
 258   
             {
 259  0
                 is = cl.getResourceAsStream( CLASSWORLDS_CONF );
 260   
             }
 261   
         }
 262   
 
 263  0
         if ( is == null )
 264   
         {
 265  0
             throw new Exception( "classworlds configuration not specified nor found "
 266   
                                  + "in the classpath" );
 267   
         }
 268   
 
 269  0
         configure( is );
 270   
 
 271  0
         try
 272   
         {
 273  0
             launchX();
 274   
         }
 275   
         catch ( InvocationTargetException e )
 276   
         {
 277   
             // Decode ITE (if we can)
 278  0
             Throwable t = e.getTargetException();
 279  0
             if ( t instanceof Exception )
 280   
             {
 281  0
                 throw (Exception) t;
 282   
             }
 283  0
             if ( t instanceof Error )
 284   
             {
 285  0
                 throw (Error) t;
 286   
             }
 287   
 
 288   
             // Else just toss the ITE
 289  0
             throw e;
 290   
         }
 291   
     }
 292   
 }
 293