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

    * @return true if the interceptor was replaced
    */
   public static boolean replaceInterceptor(Cache cache, CommandInterceptor replacingInterceptor, Class<? extends CommandInterceptor> toBeReplacedInterceptorType) {
      ComponentRegistry cr = extractComponentRegistry(cache);
      // make sure all interceptors here are wired.
      CommandInterceptor i = replacingInterceptor;
      do {
         cr.wireDependencies(i);
      }
      while ((i = i.getNext()) != null);
      InterceptorChain inch = cr.getComponent(InterceptorChain.class);
      return inch.replaceInterceptor(replacingInterceptor, toBeReplacedInterceptorType);
   }

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         assertValue(1, i, expected);
      }


      final CountDownLatch applyStateProceedLatch = new CountDownLatch(1);
      final CountDownLatch applyStateStartedLatch = new CountDownLatch(1);
      cacheConfigBuilder.customInterceptors().addInterceptor().before(InvocationContextInterceptor.class).interceptor(new CommandInterceptor() {
         @Override
         protected Object handleDefault(InvocationContext ctx, VisitableCommand cmd) throws Throwable {
            // if this 'put' command is caused by state transfer we delay it to ensure other cache operations
            // are performed first and create opportunity for inconsistencies
            if (cmd instanceof PutKeyValueCommand && ((PutKeyValueCommand) cmd).hasFlag(Flag.PUT_FOR_STATE_TRANSFER)) {

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         assertEquals("before_st_" + i, cache(2).get(i));
      }


      final CountDownLatch applyStateProceedLatch = new CountDownLatch(1);
      final CountDownLatch applyStateStartedLatch1 = new CountDownLatch(1);
      advancedCache(0).addInterceptor(new CommandInterceptor() {
         @Override
         protected Object handleDefault(InvocationContext ctx, VisitableCommand cmd) throws Throwable {
            // if this 'put' command is caused by state transfer we delay it to ensure other cache operations
            // are performed first and create opportunity for inconsistencies
            if (cmd instanceof PutKeyValueCommand && ((PutKeyValueCommand) cmd).hasFlag(Flag.PUT_FOR_STATE_TRANSFER)) {
               // signal we encounter a state transfer PUT
               applyStateStartedLatch1.countDown();
               // wait until it is ok to apply state
               if (!applyStateProceedLatch.await(15, TimeUnit.SECONDS)) {
                  throw new TimeoutException();
               }
            }
            return super.handleDefault(ctx, cmd);
         }
      }, 0);


      final CountDownLatch applyStateStartedLatch2 = new CountDownLatch(1);
      advancedCache(2).addInterceptor(new CommandInterceptor() {
         @Override
         protected Object handleDefault(InvocationContext ctx, VisitableCommand cmd) throws Throwable {
            // if this 'put' command is caused by state transfer we delay it to ensure other cache operations
            // are performed first and create opportunity for inconsistencies
            if (cmd instanceof PutKeyValueCommand && ((PutKeyValueCommand) cmd).hasFlag(Flag.PUT_FOR_STATE_TRANSFER)) {

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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 (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 synchronized 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 synchronized 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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