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    1   /***************************************************************************************
    2    * Copyright (c) Jonas BonŽr, Alexandre Vasseur. All rights reserved.                 *
    3    * http://aspectwerkz.codehaus.org                                                    *
    4    * ---------------------------------------------------------------------------------- *
    5    * The software in this package is published under the terms of the LGPL license      *
    6    * a copy of which has been included with this distribution in the license.txt file.  *
    7    **************************************************************************************/
    8   package org.codehaus.aspectwerkz.transform.inlining.deployer;
    9
    10  import org.codehaus.aspectwerkz.util.ContextClassLoader;
    11  import org.codehaus.aspectwerkz.exception.WrappedRuntimeException;
    12
    13  /***
    14   * Factory for the different redefiner implementations.
    15   *
    16   * @author <a href="mailto:jboner@codehaus.org">Jonas BonŽr </a>
    17   */
    18  public class RedefinerFactory {
    19      private static final String HOTSWAP_REDEFINER_CLASS_NAME =
    20              "org.codehaus.aspectwerkz.extension.hotswap.HotSwapRedefiner";
    21
    22      private static final String JVMTI_REDEFINER_CLASS_NAME =
    23              "org.codehaus.aspectwerkz.hook.JVMTIRedefiner";
    24
    25      /***
    26       * Creates a new redefiner instance.
    27       * Try first with JDK 5 and failover on Java 1.4 HotSwap (requires native AW module)
    28       *
    29       *
    30       * @return the redefiner instance
    31       */
    32      public static Redefiner newRedefiner(final Type type) {
    33          if (type.equals(Type.HOTSWAP)) {
    34              try {
    35                  Class redefinerClass = ContextClassLoader.forName(JVMTI_REDEFINER_CLASS_NAME);
    36                  return (Redefiner) redefinerClass.newInstance();
    37              } catch (Throwable t) {
    38                  try {
    39                      Class redefinerClass = ContextClassLoader.forName(HOTSWAP_REDEFINER_CLASS_NAME);
    40                      return (Redefiner) redefinerClass.newInstance();
    41                  } catch (ClassNotFoundException e) {
    42                      // TODO this message will be wrong if Java 5 did not started a preMain
    43                      throw new WrappedRuntimeException(
    44                              "redefiner class [HotSwapRedefiner] could not be found on classpath, make sure you have the aspectwerkz extensions jar file in your classpath",
    45                              e
    46                      );
    47                  } catch (Exception e) {
    48                      // TODO this message will be wrong upon Java 5..
    49                      throw new WrappedRuntimeException("redefiner class [HotSwapRedefiner] could not be instantiated", e);
    50                  }
    51              }
    52
    53          } else if (type.equals(Type.JVMTI)) {
    54              throw new UnsupportedOperationException("JVMTI is not supported yet");
    55          } else {
    56              throw new UnsupportedOperationException("unknown redefiner type: " + type.toString());
    57          }
    58      }
    59
    60      /***
    61       * Type-safe enum for the different redefiner implementations.
    62       *
    63       * @author <a href="mailto:jboner@codehaus.org">Jonas BonŽr </a>
    64       */
    65      public static class Type {
    66          public static final Type HOTSWAP = new Type("HOTSWAP");
    67          public static final Type JVMTI = new Type("JVMTI");
    68
    69          private final String m_name;
    70
    71          private Type(String name) {
    72              m_name = name;
    73          }
    74
    75          public String toString() {
    76              return m_name;
    77          }
    78      }
    79  }