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   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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  package org.apache.cayenne.tx;
  
  import org.apache.cayenne.CayenneRuntimeException;
  import org.apache.cayenne.DataChannel;
  import org.apache.cayenne.DataChannelSyncCallbackAction;
  import org.apache.cayenne.DataChannelSyncFilter;
  import org.apache.cayenne.DataChannelSyncFilterChain;
  import org.apache.cayenne.ObjectContext;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.graph.GraphDiff;
  
  /**
   * A {@link DataChannelSyncFilter} that provides transactions.
   *
   * @since 4.0
   */
  public class TransactionFilter implements DataChannelSyncFilter {
  
      @Inject
      protected TransactionManager transactionManager;
  
      @Override
      public GraphDiff onSync(ObjectContext originatingContext, GraphDiff changes, int syncType, DataChannelSyncFilterChain filterChain) {
          DataChannelSyncCallbackAction callbackAction = DataChannelSyncCallbackAction.getCallbackAction(
                  originatingContext.getChannel().getEntityResolver().getCallbackRegistry(),
                  originatingContext.getGraphManager(),
                  changes,
                  syncType
          );
  
          callbackAction.applyPreCommit();
  
          GraphDiff result;
          switch (syncType) {
              case DataChannel.ROLLBACK_CASCADE_SYNC:
                  result = filterChain.onSync(originatingContext, changes, syncType);
                  break;
  
              // including transaction handling logic
              case DataChannel.FLUSH_NOCASCADE_SYNC:
              case DataChannel.FLUSH_CASCADE_SYNC:
                  result = transactionManager.performInTransaction(() -> filterChain.onSync(originatingContext, changes, syncType));
                  break;
  
              default:
                  throw new CayenneRuntimeException("Invalid synchronization type: %d", syncType);
          }
  
          callbackAction.applyPostCommit();
          return result;
      }
  
  }