Examples of org.infinispan.topology.CacheTopology$Externalizer

org.infinispan.topology.CacheTopology
The status of a cache from a distribution/state transfer point of view.
The pending CH can be {@code null} if we don't have a state transfer in progress.
The {@code topologyId} is incremented every time the topology changes (i.e. state transferstarts or ends). It is not modified when the consistent hashes are updated without requiring state transfer (e.g. when a member leaves). @author Dan Berindei @since 5.2

   }


   @Override
   public DataLocality getLocality(Object key) {
      boolean transferInProgress = stateTransferManager.isStateTransferInProgressForKey(key);
      CacheTopology topology = stateTransferManager.getCacheTopology();


      // Null topology means state transfer has not occurred,
      // hence data should be stored locally.
      boolean local = topology == null
            || topology.getWriteConsistentHash().isKeyLocalToNode(getAddress(), key);


      if (transferInProgress) {
         if (local) {
            return DataLocality.LOCAL_UNCERTAIN;
         } else {

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      currentCH = new GroupingConsistentHash(currentCH, groupManager);
      ConsistentHash pendingCH = cacheTopology.getPendingCH();
      if (pendingCH != null) {
         pendingCH = new GroupingConsistentHash(pendingCH, groupManager);
      }
      return new CacheTopology(cacheTopology.getTopologyId(), currentCH, pendingCH);
   }

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      }


      // handle grouping
      newCacheTopology = addGrouping(newCacheTopology);


      CacheTopology oldCacheTopology = stateConsumer.getCacheTopology();


      if (oldCacheTopology != null && oldCacheTopology.getTopologyId() > newCacheTopology.getTopologyId()) {
         throw new IllegalStateException("Old topology is higher: old=" + oldCacheTopology + ", new=" + newCacheTopology);
      }


      ConsistentHash oldCH = oldCacheTopology != null ? oldCacheTopology.getWriteConsistentHash() : null;
      ConsistentHash newCH = newCacheTopology.getWriteConsistentHash();


      // TODO Improve notification to contain both CHs
      cacheNotifier.notifyTopologyChanged(oldCH, newCH, newCacheTopology.getTopologyId(), true);

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      return stateConsumer.getCacheTopology();
   }


   @Override
   public boolean isLocalNodeFirst() {
      CacheTopology cacheTopology = stateConsumer.getCacheTopology();
      if (cacheTopology == null || cacheTopology.getMembers().isEmpty()) {
         throw new IllegalStateException("Can only check if the local node is the first to join after joining");
      }


      return cacheTopology.getMembers().get(0).equals(rpcManager.getAddress());
   }

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   @Override
   public void forwardCommandIfNeeded(TopologyAffectedCommand command, Set<Object> affectedKeys, Address origin, boolean sync) {
      int cmdTopologyId = command.getTopologyId();
      // forward commands with older topology ids to their new targets
      // but we need to make sure we have the latest topology
      CacheTopology cacheTopology = getCacheTopology();
      int localTopologyId = cacheTopology != null ? cacheTopology.getTopologyId() : -1;
      // if it's a tx/lock/write command, forward it to the new owners
      log.tracef("CommandTopologyId=%s, localTopologyId=%s", cmdTopologyId, localTopologyId);


      if (cmdTopologyId < localTopologyId) {
         ConsistentHash writeCh = cacheTopology.getWriteConsistentHash();
         Set<Address> newTargets = writeCh.locateAllOwners(affectedKeys);
         newTargets.remove(rpcManager.getAddress());
         // Forwarding to the originator would create a cycle
         // TODO This may not be the "real" originator, but one of the original recipients
         // or even one of the nodes that one of the original recipients forwarded the command to.

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   public List<TransactionInfo> getTransactionsForSegments(Address destination, int requestTopologyId, Set<Integer> segments) throws InterruptedException {
      if (trace) {
         log.tracef("Received request for transactions from node %s for segments %s of cache %s with topology id %d", destination, segments, cacheName, requestTopologyId);
      }


      final CacheTopology cacheTopology = getCacheTopology(requestTopologyId, destination, true);
      final ConsistentHash readCh = cacheTopology.getReadConsistentHash();


      Set<Integer> ownedSegments = readCh.getSegmentsForOwner(rpcManager.getAddress());
      if (!ownedSegments.containsAll(segments)) {
         segments.removeAll(ownedSegments);
         throw new IllegalArgumentException("Segments " + segments + " are not owned by " + rpcManager.getAddress());

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      }
      return transactions;
   }


   private CacheTopology getCacheTopology(int requestTopologyId, Address destination, boolean isReqForTransactions) throws InterruptedException {
      CacheTopology cacheTopology = stateConsumer.getCacheTopology();
      if (cacheTopology == null) {
         // no commands are processed until the join is complete, so this cannot normally happen
         throw new IllegalStateException("No cache topology received yet");
      }


      if (requestTopologyId < cacheTopology.getTopologyId()) {
         if (isReqForTransactions)
            log.transactionsRequestedByNodeWithOlderTopology(destination, requestTopologyId, cacheTopology.getTopologyId());
         else
            log.segmentsRequestedByNodeWithOlderTopology(destination, requestTopologyId, cacheTopology.getTopologyId());
      } else if (requestTopologyId > cacheTopology.getTopologyId()) {
         if (trace) {
            log.tracef("%s were requested by node %s with topology %d, greater than the local " +
                  "topology (%d). Waiting for topology %d to be installed locally.", isReqForTransactions ? "Transactions" : "Segments", destination,
                  requestTopologyId, cacheTopology.getTopologyId(), requestTopologyId);
         }
         stateTransferLock.waitForTopology(requestTopologyId);
         cacheTopology = stateConsumer.getCacheTopology();
      }
      return cacheTopology;

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      if (trace) {
         log.tracef("Starting outbound transfer of segments %s to node %s with topology id %d", segments,
               destination, requestTopologyId);
      }


      final CacheTopology cacheTopology = getCacheTopology(requestTopologyId, destination, false);


      // the destination node must already have an InboundTransferTask waiting for these segments
      OutboundTransferTask outboundTransfer = new OutboundTransferTask(destination, segments, chunkSize, cacheTopology.getTopologyId(),
            cacheTopology.getReadConsistentHash(), this, dataContainer, cacheLoaderManager, rpcManager, commandsFactory, timeout, cacheName);
      addTransfer(outboundTransfer);
      outboundTransfer.execute(executorService);
   }

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      return t != null ? t.getAddress() : null;
   }


   @Override
   public int getTopologyId() {
      CacheTopology cacheTopology = stateTransferManager.getCacheTopology();
      return cacheTopology != null ? cacheTopology.getTopologyId() : -1;
   }

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   public boolean isStateTransferInProgressForKey(Object key) {
      if (configuration.clustering().cacheMode().isInvalidation()) {
         return false;
      }
      synchronized (this) {
         CacheTopology localCacheTopology = cacheTopology;
         if (localCacheTopology == null || localCacheTopology.getPendingCH() == null)
            return false;
         Address address = rpcManager.getAddress();
         boolean keyWillBeLocal = localCacheTopology.getPendingCH().isKeyLocalToNode(address, key);
         boolean keyIsLocal = localCacheTopology.getCurrentCH().isKeyLocalToNode(address, key);
         return keyWillBeLocal && !keyIsLocal;
      }
   }

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