Examples of org.jboss.cache.interceptors.base.CommandInterceptor

Package org.jboss.cache.interceptors.base

Examples of org.jboss.cache.interceptors.base.CommandInterceptor

org.jboss.cache.interceptors.base.CommandInterceptor
This is the base class for all interceptors to extend, and implements the {@link org.jboss.cache.commands.Visitor} interfaceallowing it to intercept invocations on {@link org.jboss.cache.commands.VisitableCommand}s.
Commands are created either by the {@link org.jboss.cache.invocation.CacheInvocationDelegate} (for invocations on the {@link org.jboss.cache.Cache}public interface), the {@link org.jboss.cache.invocation.NodeInvocationDelegate} for invocations on the {@link org.jboss.cache.Node}public interface, or by the {@link org.jboss.cache.marshall.CommandAwareRpcDispatcher} for remotely originating invocations, andare passed up the interceptor chain by using the {@link org.jboss.cache.interceptors.InterceptorChain} helper class.
When writing interceptors, authors can either override a specific visitXXX() method (such as {@link #visitGetKeyValueCommand(org.jboss.cache.InvocationContext,org.jboss.cache.commands.read.GetKeyValueCommand)}) or the more generic {@link #handleDefault(org.jboss.cache.InvocationContext,org.jboss.cache.commands.VisitableCommand)} which is the default behaviour ofany visit method, as defined in {@link org.jboss.cache.commands.AbstractVisitor#handleDefault(org.jboss.cache.InvocationContext,org.jboss.cache.commands.VisitableCommand)}.
The preferred approach is to override the specific visitXXX() methods that are of interest rather than to override {@link #handleDefault(org.jboss.cache.InvocationContext,org.jboss.cache.commands.VisitableCommand)}and then write a series of if statements or a switch block, if command-specific behaviour is needed.
@author Mircea.Markus@jboss.com @see VisitableCommand @see org.jboss.cache.commands.Visitor @see org.jboss.cache.interceptors.InterceptorChain @since 2.2

   public List<CommandInterceptor> asList()
   {
      if (firstInChain == null) return Collections.emptyList();


      List<CommandInterceptor> retval = new LinkedList<CommandInterceptor>();
      CommandInterceptor tmp = firstInChain;
      do
      {
         retval.add(tmp);
         tmp = tmp.getNext();
      }
      while (tmp != null);
      return Collections.unmodifiableList(retval);
   }

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   {
      if (firstInChain.getClass() == clazz)
      {
         firstInChain = firstInChain.getNext();
      }
      CommandInterceptor it = firstInChain.getNext();
      CommandInterceptor prevIt = firstInChain;
      while (it != null)
      {
         if (it.getClass() == clazz)
         {
            prevIt.setNext(it.getNext());
         }
         prevIt = it;
         it = it.getNext();
      }
   }

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    *
    * @return true if the interceptor was added; i.e. the afterInterceptor exists
    */
   public synchronized boolean addInterceptor(CommandInterceptor toAdd, Class<? extends CommandInterceptor> afterInterceptor)
   {
      CommandInterceptor it = firstInChain;
      while (it != null)
      {
         if (it.getClass().equals(afterInterceptor))
         {
            toAdd.setNext(it.getNext());
            it.setNext(toAdd);
            return true;
         }
         it = it.getNext();
      }
      return false;
   }

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   /**
    * Appends at the end.
    */
   public void appendIntereceptor(CommandInterceptor ci)
   {
      CommandInterceptor it = firstInChain;
      while (it.hasNext()) it = it.getNext();
      it.setNext(ci);
      // make sure we nullify the "next" pointer in the last interceptor.
      ci.setNext(null);
   }

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      {
         toAdd.setNext(firstInChain);
         firstInChain = toAdd;
         return true;
      }
      CommandInterceptor it = firstInChain;
      while (it.getNext() != null)
      {
         if (it.getNext().getClass().equals(beforeInterceptor))
         {
            toAdd.setNext(it.getNext());
            it.setNext(toAdd);
            return true;
         }
         it = it.getNext();
      }
      return false;
   }

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   /**
    * Appends at the end.
    */
   public void appendIntereceptor(CommandInterceptor ci)
   {
      CommandInterceptor it = firstInChain;
      while (it.hasNext()) it = it.getNext();
      it.setNext(ci);
      // make sure we nullify the "next" pointer in the last interceptor.
      ci.setNext(null);
   }

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   /**
    * Returns all the interceptors that have the fully qualified name of their class equal with the supplied class name.
    */
   public List<CommandInterceptor> getInterceptorsWithClassName(String fqName)
   {
      CommandInterceptor iterator = firstInChain;
      List<CommandInterceptor> result = new ArrayList<CommandInterceptor>(2);
      while (iterator != null)
      {
         if (iterator.getClass().getName().equals(fqName)) result.add(iterator);
         iterator = iterator.getNext();
      }
      return result;
   }

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   /**
    * Checks whether the chain contains the supplied interceptor instance.
    */
   public boolean containsInstance(CommandInterceptor interceptor)
   {
      CommandInterceptor it = firstInChain;
      while (it != null)
      {
         if (it == interceptor) return true;
         it = it.getNext();
      }
      return false;
   }

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         interceptor.setNext(firstInChain);
         firstInChain = interceptor;
         return;
      }
      if (firstInChain == null) return;
      CommandInterceptor it = firstInChain;
      int index = 0;
      while (it != null)
      {
         if (++index == position)
         {
            interceptor.setNext(it.getNext());
            it.setNext(interceptor);
            return;
         }
         it = it.getNext();
      }
      throw new IllegalArgumentException("Invalid index: " + index + " !");
   }

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      if (position == 0)
      {
         firstInChain = firstInChain.getNext();
         return;
      }
      CommandInterceptor it = firstInChain;
      int index = 0;
      while (it != null)
      {
         if (++index == position)
         {
            if (it.getNext() == null) return; //nothing to remove
            it.setNext(it.getNext().getNext());
            return;
         }
         it = it.getNext();
      }
      throw new IllegalArgumentException("Invalid position: " + position + " !");
   }

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