Package org.infinispan.container.versioning

Examples of org.infinispan.container.versioning.EntryVersionsMap

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* @since 5.1
*/
public class WriteSkewHelper {
   public static void setVersionsSeenOnPrepareCommand(VersionedPrepareCommand command, TxInvocationContext context) {
      // Build a map of keys to versions as they were seen by the transaction originator's transaction context
      EntryVersionsMap vs = new EntryVersionsMap();
      for (WriteCommand wc : command.getModifications()) {
         for (Object k : wc.getAffectedKeys()) {
            CacheEntry entry = context.lookupEntry(k);
            // the entry might be null if an attempt to lock the key was done and the actual value for this key is missing from the data container
            if (entry != null) {
               vs.put(k, (IncrementableEntryVersion) entry.getVersion());
            }
         }
      }

      // Make sure this version map is attached to the prepare command so that lock owners can perform write skew checks
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   }

   public static void readVersionsFromResponse(Response r, CacheTransaction ct) {
      if (r != null && r.isSuccessful()) {
         SuccessfulResponse sr = (SuccessfulResponse) r;
         EntryVersionsMap uv = (EntryVersionsMap) sr.getResponseValue();
         if (uv != null) ct.setUpdatedEntryVersions(uv.merge(ct.getUpdatedEntryVersions()));
      }
   }
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   public static EntryVersionsMap performWriteSkewCheckAndReturnNewVersions(VersionedPrepareCommand prepareCommand,
                                                                            DataContainer dataContainer,
                                                                            VersionGenerator versionGenerator,
                                                                            TxInvocationContext context,
                                                                            KeySpecificLogic ksl) {
      EntryVersionsMap uv = new EntryVersionsMap();
      for (WriteCommand c : prepareCommand.getModifications()) {
         for (Object k : c.getAffectedKeys()) {
            if (ksl.performCheckOnKey(k)) {
               ClusteredRepeatableReadEntry entry = (ClusteredRepeatableReadEntry) context.lookupEntry(k);

               if (entry == null) {
                  continue;
               }

               if (!context.isOriginLocal()) {
                  // What version did the transaction originator see??
                  EntryVersion versionSeen = prepareCommand.getVersionsSeen().get(k);
                  if (versionSeen != null) entry.setVersion(versionSeen);
               }

               if (entry.performWriteSkewCheck(dataContainer, context)) {
                  IncrementableEntryVersion newVersion = entry.isCreated() ? versionGenerator.generateNew() : versionGenerator.increment((IncrementableEntryVersion) entry.getVersion());
                  uv.put(k, newVersion);
               } else {
                  // Write skew check detected!
                  throw new WriteSkewException("Write skew detected on key " + k + " for transaction " + context.getTransaction());
               }
            }
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   @Override
   public Object visitPrepareCommand(TxInvocationContext ctx, PrepareCommand command) throws Throwable {
      if (!ctx.isOriginLocal() || command.isReplayEntryWrapping()) {
         for (WriteCommand c : command.getModifications()) c.acceptVisitor(ctx, entryWrappingVisitor);
      }
      EntryVersionsMap newVersionData= null;
      if (ctx.isOriginLocal() && !((LocalTransaction)ctx.getCacheTransaction()).isFromStateTransfer()) newVersionData = cdl.createNewVersionsAndCheckForWriteSkews(versionGenerator, ctx, (VersionedPrepareCommand) command);

      Object retval = invokeNextInterceptor(ctx, command);

      if (!ctx.isOriginLocal()) newVersionData = cdl.createNewVersionsAndCheckForWriteSkews(versionGenerator, ctx, (VersionedPrepareCommand) command);
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      @Override
      public EntryVersionsMap createNewVersionsAndCheckForWriteSkews(VersionGenerator versionGenerator, TxInvocationContext context, VersionedPrepareCommand prepareCommand) {
         // In REPL mode, this happens if we are the coordinator.
         if (rpcManager.getTransport().isCoordinator()) {
            // Perform a write skew check on each entry.
            EntryVersionsMap uv = performWriteSkewCheckAndReturnNewVersions(prepareCommand, dataContainer,
                                                                            versionGenerator, context,
                                                                            keySpecificLogic);
            context.getCacheTransaction().setUpdatedEntryVersions(uv);
            return uv;
         } else if (prepareCommand.getModifications().length == 0) {
            // For situations when there's a local-only put in the prepare,
            // simply add an empty entry version map. This works because when
            // a local-only put is executed, this is not added to the prepare
            // modification list.
            context.getCacheTransaction().setUpdatedEntryVersions(new EntryVersionsMap());
         }
         return null;
      }
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      }

      @Override
      public EntryVersionsMap createNewVersionsAndCheckForWriteSkews(VersionGenerator versionGenerator, TxInvocationContext context, VersionedPrepareCommand prepareCommand) {
         // Perform a write skew check on mapped entries.
         EntryVersionsMap uv = performWriteSkewCheckAndReturnNewVersions(prepareCommand, dataContainer,
                                                                         versionGenerator, context,
                                                                         keySpecificLogic);

         CacheTransaction cacheTransaction = context.getCacheTransaction();
         EntryVersionsMap uvOld = cacheTransaction.getUpdatedEntryVersions();
         if (uvOld != null && !uvOld.isEmpty()) {
            uvOld.putAll(uv);
            uv = uvOld;
         }
         cacheTransaction.setUpdatedEntryVersions(uv);
         return (uv.isEmpty()) ? null : uv;
      }
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   @Override
   public Object visitPrepareCommand(TxInvocationContext ctx, PrepareCommand command) throws Throwable {
      if (!ctx.isOriginLocal() || command.isReplayEntryWrapping()) {
         for (WriteCommand c : command.getModifications()) c.acceptVisitor(ctx, entryWrappingVisitor);
      }
      EntryVersionsMap newVersionData= null;
      if (ctx.isOriginLocal() && !((LocalTransaction)ctx.getCacheTransaction()).isFromStateTransfer()) newVersionData = cdl.createNewVersionsAndCheckForWriteSkews(versionGenerator, ctx, (VersionedPrepareCommand) command);

      Object retval = invokeNextInterceptor(ctx, command);

      if (!ctx.isOriginLocal()) newVersionData = cdl.createNewVersionsAndCheckForWriteSkews(versionGenerator, ctx, (VersionedPrepareCommand) command);
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      @Override
      public EntryVersionsMap createNewVersionsAndCheckForWriteSkews(VersionGenerator versionGenerator, TxInvocationContext context, VersionedPrepareCommand prepareCommand) {
         // In REPL mode, this happens if we are the coordinator.
         if (rpcManager.getTransport().isCoordinator()) {
            // Perform a write skew check on each entry.
            EntryVersionsMap uv = performWriteSkewCheckAndReturnNewVersions(prepareCommand, dataContainer,
                                                                            versionGenerator, context,
                                                                            keySpecificLogic);
            context.getCacheTransaction().setUpdatedEntryVersions(uv);
            return uv;
         } else if (prepareCommand.getModifications().length == 0) {
            // For situations when there's a local-only put in the prepare,
            // simply add an empty entry version map. This works because when
            // a local-only put is executed, this is not added to the prepare
            // modification list.
            context.getCacheTransaction().setUpdatedEntryVersions(new EntryVersionsMap());
         }
         return null;
      }
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      }

      @Override
      public EntryVersionsMap createNewVersionsAndCheckForWriteSkews(VersionGenerator versionGenerator, TxInvocationContext context, VersionedPrepareCommand prepareCommand) {
         // Perform a write skew check on mapped entries.
         EntryVersionsMap uv = performWriteSkewCheckAndReturnNewVersions(prepareCommand, dataContainer,
                                                                         versionGenerator, context,
                                                                         keySpecificLogic);

         CacheTransaction cacheTransaction = context.getCacheTransaction();
         EntryVersionsMap uvOld = cacheTransaction.getUpdatedEntryVersions();
         if (uvOld != null && !uvOld.isEmpty()) {
            uvOld.putAll(uv);
            uv = uvOld;
         }
         cacheTransaction.setUpdatedEntryVersions(uv);
         return (uv.isEmpty()) ? null : uv;
      }
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public class WriteSkewHelper {

   public static void readVersionsFromResponse(Response r, CacheTransaction ct) {
      if (r != null && r.isSuccessful()) {
         SuccessfulResponse sr = (SuccessfulResponse) r;
         EntryVersionsMap uv = (EntryVersionsMap) sr.getResponseValue();
         if (uv != null) ct.setUpdatedEntryVersions(uv.merge(ct.getUpdatedEntryVersions()));
      }
   }
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Related Classes of org.infinispan.container.versioning.EntryVersionsMap

  • org.infinispan.interceptors.CacheStoreInterceptor
  • org.infinispan.interceptors.CacheWriterInterceptor
  • org.infinispan.interceptors.locking.ClusteringDependentLogic$AbstractClusteringDependentLogic
  • org.infinispan.interceptors.locking.ClusteringDependentLogic$AllNodesLogic
  • org.infinispan.interceptors.locking.ClusteringDependentLogic$DistributionLogic
  • org.infinispan.interceptors.locking.ClusteringDependentLogic$InvalidationLogic
  • org.infinispan.interceptors.totalorder.TotalOrderVersionedEntryWrappingInterceptor
  • org.infinispan.interceptors.VersionedDistributionInterceptor
  • org.infinispan.interceptors.VersionedEntryWrappingInterceptor
  • org.infinispan.interceptors.VersionedReplicationInterceptor
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