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  package org.apache.cayenne.cache;
  
  import org.apache.cayenne.ObjectContext;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.query.ObjectSelect;
  import org.apache.cayenne.testdo.testmap.Artist;
  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;
  
  import java.util.List;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotSame;
  
  @UseCayenneRuntime(CayenneProjects.TESTMAP_PROJECT)
  public class QueryCacheIT extends RuntimeCase {
  
      @Inject
      private ObjectContext context1;
      
      @Inject
      private ObjectContext context2;
  
      @Test
      public void testLocalCache() {
          
          Artist a = context1.newObject(Artist.class);
          a.setArtistName("artist");
          context1.commitChanges();
          
          ObjectSelect<Artist> q = ObjectSelect.query(Artist.class).localCache();
          List<Artist> result1 = q.select(context1);
          List<Artist> result2 = q.select(context2);
          
          assertNotSame(
                  result1.get(0).getObjectContext(), 
                  result2.get(0).getObjectContext());
      }
      
      @Test(expected = UnsupportedOperationException.class)
      public void testLocalCacheStoresAnImmutableList() {
          
          Artist a = context1.newObject(Artist.class);
          a.setArtistName("artist");
          context1.commitChanges();
          
          ObjectSelect<Artist> q = ObjectSelect.query(Artist.class).localCache();
          List<Artist> result1 = context1.performQuery(q);
          assertEquals(1, result1.size());
          
          // Mutate the returned list. This should not change the cache.
          result1.add(context1.newObject(Artist.class));
          List<Artist> result2 = context1.performQuery(q);
          assertEquals("the list stored in the local query cache cannot be mutated after being returned", 1, result2.size());
  
          result2.add(context1.newObject(Artist.class));
          List<Artist> result3 = context1.performQuery(q);
          assertEquals("the list stored in the local query cache cannot be mutated after being returned", 1, result3.size());
      }
      
      @Test
      public void testSharedCacheStoresAnImmutableList() {
          
          Artist a = context1.newObject(Artist.class);
          a.setArtistName("artist");
          context1.commitChanges();
          
          ObjectSelect<Artist> q = ObjectSelect.query(Artist.class).sharedCache();
          List<Artist> result1 = context1.performQuery(q);
          assertEquals(1, result1.size());
          
          // Mutate the returned list. This should not change the cache.
          result1.add(context1.newObject(Artist.class));
          List<Artist> result2 = context1.performQuery(q);
          assertEquals("the list stored in the shared query cache cannot be mutated after being returned", 1, result2.size());
      }
  }
  