Examples of org.infinispan.interceptors.base.CommandInterceptor

Package org.infinispan.interceptors.base

Examples of org.infinispan.interceptors.base.CommandInterceptor

org.infinispan.interceptors.base.CommandInterceptor
This is the base class for all interceptors to extend, and implements the {@link Visitor} interface allowing it tointercept invocations on {@link VisitableCommand}s.
Commands are either created by the {@link CacheImpl} (for invocations on the {@link Cache} public interface), orby the {@link InboundInvocationHandler} for remotely originating invocations, and are passed up the interceptor chainby using the {@link InterceptorChain} helper class.
When writing interceptors, authors can either override a specific visitXXX() method (such as {@link #visitGetKeyValueCommand(InvocationContext,GetKeyValueCommand)}) or the more generic {@link #handleDefault(InvocationContext,VisitableCommand)} which is the default behaviour of any visit method, as definedin {@link AbstractVisitor#handleDefault(InvocationContext,VisitableCommand)}.
The preferred approach is to override the specific visitXXX() methods that are of interest rather than to override {@link #handleDefault(InvocationContext,VisitableCommand)} and then write a series of if statements or a switchblock, if command-specific behaviour is needed.
@author Mircea.Markus@jboss.com @see VisitableCommand @see Visitor @see InterceptorChain @since 4.0

      if (firstInChain == null) return;
      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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   /**
    * Returns the number of interceptors in the chain.
    */
   public int size() {
      int size = 0;
      CommandInterceptor it = firstInChain;
      while (it != null) {
         size++;
         it = it.getNext();
      }
      return size;


   }

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    */
   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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    */
   public void removeInterceptor(Class<? extends CommandInterceptor> clazz) {
      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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    * Adds a new interceptor in list after an interceptor of a given type.
    *
    * @return true if the interceptor was added; i.e. the afterInterceptor exists
    */
   public boolean addInterceptorAfter(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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      if (firstInChain.getClass().equals(beforeInterceptor)) {
         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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      if (firstInChain.getClass().equals(toBeReplacedInterceptorType)) {
         replacingInterceptor.setNext(firstInChain.getNext());
         firstInChain = replacingInterceptor;
         return true;
      }
      CommandInterceptor it = firstInChain;
      CommandInterceptor previous = firstInChain;
      while (it.getNext() != null) {
         CommandInterceptor current = it.getNext();
         if (current.getClass().equals(toBeReplacedInterceptorType)) {
            replacingInterceptor.setNext(current.getNext());
            previous.setNext(replacingInterceptor);
            return true;
         }
         previous = current;
         it = current;

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   /**
    * Appends at the end.
    */
   public synchronized 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 interceptors.
      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 name) {
      CommandInterceptor iterator = firstInChain;
      List<CommandInterceptor> result = new ArrayList<CommandInterceptor>(2);
      while (iterator != null) {
         if (iterator.getClass().getName().equals(name)) result.add(iterator);
         iterator = iterator.getNext();
      }
      return result;
   }

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      return result;
   }


   public String toString() {
      StringBuilder sb = new StringBuilder();
      CommandInterceptor i = firstInChain;
      while (i != null) {
         sb.append("\n\t>> ");
         sb.append(i.getClass().getName());
         i = i.getNext();
      }
      return sb.toString();
   }

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