Examples of javassist.util.proxy.ProxyFactory$CacheKey

javassist.util.proxy.ProxyFactory
ute the original method. } }; f.setFilter(new MethodFilter() { public boolean isHandled(Method m) { // ignore finalize() return !m.getName().equals("finalize"); } }); Class c = f.createClass(); Foo foo = (Foo)c.newInstance(); ((ProxyObject)foo).setHandler(mi);

Then, the following method call will be forwarded to MethodHandler mi and prints a message before executing the originally called method bar() in Foo.

 foo.bar();

The last three lines of the code shown above can be replaced with a call to the helper method create, which generates a proxy class, instantiates it, and sets the method handler of the instance:

 : Foo foo = (Foo)f.create(new Class[0], new Object[0], mi);

To change the method handler during runtime, execute the following code:

 MethodHandler mi2 = ... ;    // another handler ((ProxyObject)foo).setHandler(mi2);

You can also specify the default method handler:

 ProxyFactory f2 = new ProxyFactory(); f2.setSuperclass(Foo.class); f2.setHandler(mi);            // set the default handler Class c2 = f2.createClass();

The default handler is implicitly attached to an instance of the generated class c2. Calling setHandler on the instance is not necessary unless another method handler must be attached to the instance.

The following code is an example of method handler. It does not execute anything except invoking the original method:

 class SimpleHandler implements MethodHandler { public Object invoke(Object self, Method m, Method proceed, Object[] args) throws Exception { return proceed.invoke(self, args); } }

A proxy object generated by ProxyFactory is serializable if its super class or interfaces implement a java.io.Serializable. However, a serialized proxy object will not be compatible with future releases. The serialization support should be used for short-term storage or RMI. @see MethodHandler @since 3.1

    }
  }


  private static Counter getCounter(final Accumulator<Map<String, Long>> accum, final String group,
                                    final String counterName) {
    ProxyFactory factory = new ProxyFactory();
    Class<Counter> superType = Counter.class;
    Class[] types = new Class[0];
    Object[] args = new Object[0];
    if (superType.isInterface()) {
      factory.setInterfaces(new Class[] { superType });
    } else {
      types = new Class[] { String.class, String.class };
      args = new Object[] { group, counterName };
      factory.setSuperclass(superType);
    }


    final Set<String> handledMethods = ImmutableSet.of("getDisplayName", "getName",
        "getValue", "increment", "setValue", "setDisplayName");
    factory.setFilter(new MethodFilter() {
      @Override
      public boolean isHandled(Method m) {
        return handledMethods.contains(m.getName());
      }
    });
    MethodHandler handler = new MethodHandler() {
      @Override
      public Object invoke(Object arg0, Method m, Method arg2, Object[] args) throws Throwable {
        String name = m.getName();
        if ("increment".equals(name)) {
          accum.add(ImmutableMap.of(group + ":" + counterName, (Long) args[0]));
          return null;
        } else if ("getDisplayName".equals(name)) {
          return counterName;
        } else if ("getName".equals(name)) {
          return counterName;
        } else if ("setDisplayName".equals(name)) {
          // No-op
          return null;
        } else if ("setValue".equals(name)) {
          throw new UnsupportedOperationException("Cannot set counter values in Spark, only increment them");
        } else if ("getValue".equals(name)) {
          throw new UnsupportedOperationException("Cannot read counters during Spark execution");
        } else {
          throw new IllegalStateException("Unhandled method " + name);
        }
      }
    };
    try {
      Object newInstance = factory.create(types, args, handler);
      return (Counter) newInstance;
    } catch (Exception e) {
      e.printStackTrace();
      throw new RuntimeException(e);
    }

   * Note: The intention of this is to provide the bare essentials that are
   * required to make the {@linkplain MemPipeline} work. It lacks even the basic
   * things that can proved some support for unit testing pipeline.
   */
  private static TaskInputOutputContext<?, ?, ?, ?> getInMemoryContext(final Configuration conf) {
    ProxyFactory factory = new ProxyFactory();
    Class<TaskInputOutputContext> superType = TaskInputOutputContext.class;
    Class[] types = new Class[0];
    Object[] args = new Object[0];
    final TaskAttemptID taskAttemptId = new TaskAttemptID();
    if (superType.isInterface()) {
      factory.setInterfaces(new Class[] { superType });
    } else {
      types = new Class[] { Configuration.class, TaskAttemptID.class, RecordWriter.class, OutputCommitter.class,
          StatusReporter.class };
      args = new Object[] { conf, taskAttemptId, null, null, null };
      factory.setSuperclass(superType);
    }


    final Set<String> handledMethods = ImmutableSet.of("getConfiguration", "getCounter", 
                                                  "progress", "getTaskAttemptID");
    factory.setFilter(new MethodFilter() {
      @Override
      public boolean isHandled(Method m) {
        return handledMethods.contains(m.getName());
      }
    });
    MethodHandler handler = new MethodHandler() {
      @Override
      public Object invoke(Object arg0, Method m, Method arg2, Object[] args) throws Throwable {
        String name = m.getName();
        if ("getConfiguration".equals(name)) {
          return conf;
        } else if ("progress".equals(name)) {
          // no-op
          return null;
        } else if ("getTaskAttemptID".equals(name)) {
          return taskAttemptId;
        } else if ("getCounter".equals(name)){ // getCounter
          if (args.length == 1) {
            return MemPipeline.getCounters().findCounter((Enum<?>) args[0]);
          } else {
            return MemPipeline.getCounters().findCounter((String) args[0], (String) args[1]);
          }
        } else {
          throw new IllegalStateException("Unhandled method " + name);
        }
      }
    };
    try {
      Object newInstance = factory.create(types, args, handler);
      return (TaskInputOutputContext<?, ?, ?, ?>) newInstance;
    } catch (Exception e) {
      e.printStackTrace();
      throw new RuntimeException(e);
    }

              getIdentifierMethod,
              setIdentifierMethod,
              componentIdType,
              session
      );
      ProxyFactory factory = new ProxyFactory();
      factory.setSuperclass( interfaces.length == 1 ? persistentClass : null );
      factory.setInterfaces( interfaces );
      factory.setFilter( FINALIZE_FILTER );
      Class cl = factory.createClass();
      final HibernateProxy proxy = ( HibernateProxy ) cl.newInstance();
      ( ( ProxyObject ) proxy ).setHandler( instance );
      instance.constructed = true;
      return proxy;
    }

      Class persistentClass,
          Class[] interfaces) throws HibernateException {
    // note: interfaces is assumed to already contain HibernateProxy.class


    try {
      ProxyFactory factory = new ProxyFactory();
      factory.setSuperclass( interfaces.length == 1 ? persistentClass : null );
      factory.setInterfaces( interfaces );
      factory.setFilter( FINALIZE_FILTER );
      return factory.createClass();
    }
    catch ( Throwable t ) {
      LoggerFactory.getLogger( BasicLazyInitializer.class ).error(
          "Javassist Enhancement failed: "
          + persistentClass.getName(), t

          setIdentifierMethod,
          componentIdType,
          session,
          ReflectHelper.overridesEquals(persistentClass)
      );
      ProxyFactory factory = new ProxyFactory();
      factory.setSuperclass( interfaces.length == 1 ? persistentClass : null );
      factory.setInterfaces( interfaces );
      factory.setFilter( FINALIZE_FILTER );
      Class cl = factory.createClass();
      final HibernateProxy proxy = ( HibernateProxy ) cl.newInstance();
      ( ( Proxy ) proxy ).setHandler( instance );
      instance.constructed = true;
      return proxy;
    }

      Class persistentClass,
      Class[] interfaces) throws HibernateException {
    // note: interfaces is assumed to already contain HibernateProxy.class


    try {
      ProxyFactory factory = new ProxyFactory();
      factory.setSuperclass( interfaces.length == 1 ? persistentClass : null );
      factory.setInterfaces( interfaces );
      factory.setFilter( FINALIZE_FILTER );
      return factory.createClass();
    }
    catch ( Throwable t ) {
      LOG.error(LOG.javassistEnhancementFailed(persistentClass.getName()), t);
      throw new HibernateException(LOG.javassistEnhancementFailed(persistentClass.getName()), t);
    }

              getIdentifierMethod,
              setIdentifierMethod,
              componentIdType,
              session
      );
      ProxyFactory factory = new ProxyFactory();
      factory.setSuperclass( interfaces.length == 1 ? persistentClass : null );
      factory.setInterfaces( interfaces );
      factory.setFilter( FINALIZE_FILTER );
      Class cl = factory.createClass();
      final HibernateProxy proxy = ( HibernateProxy ) cl.newInstance();
      ( ( ProxyObject ) proxy ).setHandler( instance );
      instance.constructed = true;
      return proxy;
    }

      Class persistentClass,
          Class[] interfaces) throws HibernateException {
    // note: interfaces is assumed to already contain HibernateProxy.class


    try {
      ProxyFactory factory = new ProxyFactory();
      factory.setSuperclass( interfaces.length == 1 ? persistentClass : null );
      factory.setInterfaces( interfaces );
      factory.setFilter( FINALIZE_FILTER );
      return factory.createClass();
    }
    catch ( Throwable t ) {
      LoggerFactory.getLogger( BasicLazyInitializer.class ).error(
          "Javassist Enhancement failed: "
          + persistentClass.getName(), t

              getIdentifierMethod,
              setIdentifierMethod,
              componentIdType,
              session
      );
      ProxyFactory factory = new ProxyFactory();
      factory.setSuperclass( interfaces.length == 1 ? persistentClass : null );
      factory.setInterfaces( interfaces );
      factory.setFilter( FINALIZE_FILTER );
      Class cl = factory.createClass();
      final HibernateProxy proxy = ( HibernateProxy ) cl.newInstance();
      ( ( ProxyObject ) proxy ).setHandler( instance );
      instance.constructed = true;
      return proxy;
    }

      Class persistentClass,
          Class[] interfaces) throws HibernateException {
    // note: interfaces is assumed to already contain HibernateProxy.class


    try {
      ProxyFactory factory = new ProxyFactory();
      factory.setSuperclass( interfaces.length == 1 ? persistentClass : null );
      factory.setInterfaces( interfaces );
      factory.setFilter( FINALIZE_FILTER );
      return factory.createClass();
    }
    catch ( Throwable t ) {
      LogFactory.getLog( BasicLazyInitializer.class ).error(
          "Javassist Enhancement failed: "
          + persistentClass.getName(), t

Examples of javassist.util.proxy.ProxyFactory$CacheKey

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