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  package org.apache.cayenne.unit.di.runtime;
  
  import org.apache.cayenne.access.UnitTestDomain;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.di.Provider;
  import org.apache.cayenne.runtime.CayenneRuntime;
  import org.apache.cayenne.unit.di.DataChannelInterceptor;
  import org.apache.cayenne.unit.di.DataChannelSyncStats;
  import org.apache.cayenne.unit.di.UnitTestClosure;
  
  public class RuntimeCaseDataChannelInterceptor implements DataChannelInterceptor {
  
      @Inject
      // injecting provider to make this provider independent from scoping of CayenneRuntime
      protected Provider<CayenneRuntime> runtimeProvider;
  
      public void runWithQueriesBlocked(UnitTestClosure closure) {
  
          UnitTestDomain channel = (UnitTestDomain) runtimeProvider
                  .get()
                  .getChannel();
  
          channel.setBlockingQueries(true);
          try {
              closure.execute();
          }
          finally {
              channel.setBlockingQueries(false);
          }
      }
  
      public int runWithQueryCounter(UnitTestClosure closure) {
          UnitTestDomain channel = (UnitTestDomain) runtimeProvider.get().getChannel();
          RuntimeCaseDataNode node = (RuntimeCaseDataNode)channel.getDataNodes().iterator().next();
  
          int start = node.getQueriesCount();
          int end;
          try {
              closure.execute();
          } finally {
              end = node.getQueriesCount();
          }
          return end - start;
      }
  
      public DataChannelSyncStats runWithSyncStatsCollection(UnitTestClosure closure) {
          throw new UnsupportedOperationException("TODO... so far unused");
      }
  }
  