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  package org.apache.cayenne.access;
  
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.testdo.db1.CrossdbM1E1;
  import org.apache.cayenne.testdo.db2.CrossdbM2E1;
  import org.apache.cayenne.testdo.db2.CrossdbM2E2;
  import org.apache.cayenne.unit.UnitDbAdapter;
  import org.apache.cayenne.unit.di.runtime.CayenneProjects;
  import org.apache.cayenne.unit.di.runtime.RuntimeCase;
  import org.apache.cayenne.unit.di.runtime.UseCayenneRuntime;
  import org.junit.Test;
  
  @UseCayenneRuntime(CayenneProjects.MULTINODE_PROJECT)
  public class DataContextCrossDBIT extends RuntimeCase {
  
      @Inject
      private DataContext context;
  
      @Inject
      private UnitDbAdapter dbAdapter;
  
      @Test
      public void testMultiDBUpdate() {
  
          if(!dbAdapter.supportsPKGeneratorConcurrency()) {
              return;
          }
          // for now testing that no exceptions are thrown... wouldn't hurt to check the
          // data as well???
  
          // insert
          CrossdbM1E1 o1 = context.newObject(CrossdbM1E1.class);
          o1.setName("o1");
  
          CrossdbM2E1 o2 = context.newObject(CrossdbM2E1.class);
          o2.setName("o2");
  
          CrossdbM2E2 o3 = context.newObject(CrossdbM2E2.class);
          o3.setName("o3");
  
          o3.setToM1E1(o1);
          o3.setToM2E1(o2);
          context.commitChanges();
  
          // update
          CrossdbM1E1 o11 = context.newObject(CrossdbM1E1.class);
          o11.setName("o11");
          o3.setToM1E1(o11);
          context.commitChanges();
  
          // update with existing
  
          o3.setToM1E1(o1);
          context.commitChanges();
      }
  }
  