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  package org.apache.cayenne.unit.di;
  
  import org.apache.cayenne.DataChannel;
  import org.apache.cayenne.DataChannelSyncFilter;
  import org.apache.cayenne.DataChannelSyncFilterChain;
  import org.apache.cayenne.ObjectContext;
  import org.apache.cayenne.access.DataDomain;
  import org.apache.cayenne.graph.GraphDiff;
  import org.junit.rules.ExternalResource;
  
  import java.util.function.Supplier;
  
  public class CommitStats implements DataChannelSyncFilter {
  
      private int commitCount;
      private Supplier<DataDomain> dataDomain;
  
      public CommitStats(Supplier<DataDomain> dataDomain) {
          this.dataDomain = dataDomain;
      }
  
      public void before() {
          dataDomain.get().addSyncFilter(this);
          commitCount = 0;
      }
  
      public void after() {
          dataDomain.get().removeSyncFilter(this);
      }
  
      @Override
      public GraphDiff onSync(
              ObjectContext originatingContext,
              GraphDiff changes,
              int syncType,
              DataChannelSyncFilterChain filterChain) {
  
          switch (syncType) {
              case DataChannel.FLUSH_CASCADE_SYNC:
                  commitCount++;
                  break;
          }
  
          return filterChain.onSync(originatingContext, changes, syncType);
      }
  
      public int getCommitCount() {
          return commitCount;
      }
  }
  