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From mcconn...@apache.org
Subject cvs commit: avalon-sandbox/merlin/src/java/org/apache/avalon/merlin/kernel/impl DefaultKernelLoader.java KernelLoader.java
Date Sat, 08 Mar 2003 15:28:16 GMT
mcconnell    2003/03/08 07:28:16

  Added:       merlin/src/java/org/apache/avalon/merlin/kernel/impl
                        DefaultKernelLoader.java
  Removed:     merlin/src/java/org/apache/avalon/merlin/kernel/impl
                        KernelLoader.java
  Log:
  KernelLoader moved to DefaultKernelLoader.
  
  Revision  Changes    Path
  1.1                  avalon-sandbox/merlin/src/java/org/apache/avalon/merlin/kernel/impl/DefaultKernelLoader.java
  
  Index: DefaultKernelLoader.java
  ===================================================================
  
  
  package org.apache.avalon.merlin.kernel.impl;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.FileInputStream;
  import java.io.InputStream;
  import java.io.IOException;
  import java.io.FileNotFoundException;
  import java.util.StringTokenizer;
  import java.util.Enumeration;
  import java.util.List;
  import java.util.Iterator;
  import java.util.jar.JarFile;
  import java.util.ArrayList;
  import java.util.Map;
  import java.util.jar.Attributes;
  import java.util.jar.Manifest;
  import java.net.URLClassLoader;
  import java.net.URL;
  import java.util.zip.ZipEntry;
  import java.net.MalformedURLException;
  import java.net.JarURLConnection;
  
  import org.xml.sax.SAXException;
  
  import org.apache.avalon.framework.configuration.Configuration;
  import org.apache.avalon.framework.configuration.ConfigurationException;
  import org.apache.avalon.framework.configuration.DefaultConfigurationBuilder;
  import org.apache.avalon.framework.configuration.DefaultConfiguration;
  import org.apache.avalon.framework.context.Context;
  import org.apache.avalon.framework.context.DefaultContext;
  import org.apache.avalon.framework.context.ContextException;
  import org.apache.avalon.merlin.block.Block;
  import org.apache.avalon.merlin.block.BlockException;
  import org.apache.avalon.assembly.util.ExceptionHelper;
  import org.apache.avalon.assembly.locator.Contextualizable;
  import org.apache.avalon.assembly.locator.DefaultLocator;
  import org.apache.avalon.assembly.locator.Locator;
  import org.apache.avalon.merlin.kernel.Kernel;
  import org.apache.avalon.merlin.kernel.KernelLoader;
  import org.apache.avalon.merlin.kernel.KernelException;
  import org.apache.avalon.merlin.kernel.KernelRuntimeException;
  
  /**
   * The DefaultKernelLoader provides support for the establishment of a kernel 
   * instance assuming a file system deployment environment.
   *
   * @see Kernel
   * @see KernelLoader
   * @see DefaultKernel
   */
  public class DefaultKernelLoader
  {
     /**
      * Creation of a new Kernel instance.  Arguments passed 
      * passed to the kernel build operation are detailed in the following 
      * table.
      *
      * <table BORDER="1" CELLSPACING="0" CELLPADDING="3" WIDTH="90%" >
      *   <tr BGCOLOR="#EEEEFF">
      *     <td><b>key</b></td><td><b>type</b></td><td><b>description</b></td>
      *   </tr>
      *   <tr>
      *     <td><code>urn:merlin:home</code></td>
      *     <td>{@link java.io.File}</td>
      *     <td>The working home directory.</td> 
      *   </tr>
      *   <tr>
      *     <td><code>urn:merlin:system</code></td>
      *     <td>{@link java.io.File}</td>
      *     <td>The Merlin system directory.</td> 
      *   </tr>
      *   <tr>
      *     <td><code>urn:merlin:classloader.common</code></td>
      *     <td>{@link java.lang.ClassLoader}</td>
      *     <td>The shared classloader.</td>
      *   </tr>
      *   <tr>
      *     <td><code>urn:merlin:classloader.system</code></td>
      *     <td>{@link java.lang.ClassLoader}</td>
      *     <td>The Merlin internal classloader.</td> 
      *   </tr>
      *   <tr>
      *     <td><code>urn:merlin:debug</code></td>
      *     <td>{@link java.lang.String}</td>
      *     <td>An optional system logging priority (a value of INFO, WARN, ERROR, or
DEBUG) to 
      *       be used for internal Merlin execution.</td> 
      *   </tr>
      * </table>
      *
      * @param map a map of initialization arguments
      * @return the kernel instance
      */
      public Kernel build( Map map ) throws KernelException
      {
  
          //
          // get the kernel configuration profile
          //     
  
          File profile = (File) map.get( "urn:merlin:kernel.profile" );
  
          //
          // contextualize, configure, initialize and start the kernel
          //
  
          Throwable cause = null;
          DefaultLocator context = new DefaultLocator( map );
          context.makeReadOnly();
          DefaultKernel kernel = null;
          try
          {
              kernel = new DefaultKernel();
              kernel.contextualize( context );
              kernel.configure( getKernelConfiguration( profile ) );
              kernel.initialize();
          }
          catch( KernelException e )
          {
              // its already been logged
              cause = e;
          }
          catch( BlockException e )
          {
              // its already been logged
              cause = e;
          }
          catch( Throwable e )
          {
              final String error = "Unexpected kernel deployment failure.";
              String message = ExceptionHelper.packException( error, e );
              System.err.println( message );
              cause = new Exception( error );
          }
          finally
          {
              if( cause != null )
              {
                  throw new KernelException( "Kernel error.", cause );
              }
              else
              {
                  return kernel;
              }
          }
      }
  
      private Configuration getKernelConfiguration( final File file ) 
        throws ConfigurationException, IOException, SAXException
      {
          DefaultConfigurationBuilder builder = new DefaultConfigurationBuilder();
          InputStream is = new FileInputStream( file );
          if( is == null )
          {
              throw new IOException(
                "Could not load kernel configuration resource \"" + file + "\"" );
          }
          return builder.build( is );
      }
  }
  
  
  

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