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  package org.apache.cayenne.access;
  
  import org.apache.cayenne.Cayenne;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.query.ObjectSelect;
  import org.apache.cayenne.query.SQLTemplate;
  import org.apache.cayenne.test.parallel.ParallelTestContainer;
  import org.apache.cayenne.testdo.testmap.Artist;
  import org.apache.cayenne.unit.di.runtime.CayenneProjects;
  import org.apache.cayenne.unit.di.runtime.UseCayenneRuntime;
  import org.apache.cayenne.unit.di.runtime.WeakReferenceStrategyRuntimeCase;
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  
  @UseCayenneRuntime(CayenneProjects.TESTMAP_PROJECT)
  public class ObjectStoreGCIT extends WeakReferenceStrategyRuntimeCase {
  
      @Inject
      private DataContext context;
  
      @Test
      public void testReleaseUnreferenced() throws Exception {
          context.performGenericQuery(new SQLTemplate(
                  Artist.class,
                  "insert into ARTIST (ARTIST_ID, ARTIST_NAME) values (1, 'aa')"));
  
          assertEquals(0, context.getObjectStore().registeredObjectsCount());
          ObjectSelect.query(Artist.class).select(context);
          assertEquals(1, context.getObjectStore().registeredObjectsCount());
  
          // allow for slow GC
          new ParallelTestContainer() {
  
              @Override
              protected void assertResult() throws Exception {
                  System.gc();
                  assertEquals(0, context.getObjectStore().registeredObjectsCount());
              }
          }.runTest(2000);
      }
  
      @Test
      public void testRetainUnreferencedNew() throws Exception {
          assertEquals(0, context.getObjectStore().registeredObjectsCount());
          Artist a = context.newObject(Artist.class);
          a.setArtistName("X");
          a = null;
          assertEquals(1, context.getObjectStore().registeredObjectsCount());
  
          // allow for slow GC
          new ParallelTestContainer() {
  
              @Override
              protected void assertResult() throws Exception {
                  System.gc();
                  assertEquals(1, context.getObjectStore().registeredObjectsCount());
              }
          }.runTest(2000);
  
          assertEquals(1, context.getObjectStore().registeredObjectsCount());
          context.commitChanges();
          new ParallelTestContainer() {
  
              @Override
              protected void assertResult() throws Exception {
                  System.gc();
                  assertEquals(0, context.getObjectStore().registeredObjectsCount());
              }
          }.runTest(2000);
  
      }
  
      @Test
      public void testRetainUnreferencedModified() throws Exception {
          context.performGenericQuery(new SQLTemplate(
                  Artist.class,
                  "insert into ARTIST (ARTIST_ID, ARTIST_NAME) values (1, 'aa')"));
  
          assertEquals(0, context.getObjectStore().registeredObjectsCount());
          Artist a = Cayenne.objectForPK(context, Artist.class, 1);
          a.setArtistName("Y");
          a = null;
          assertEquals(1, context.getObjectStore().registeredObjectsCount());
  
          new ParallelTestContainer() {
  
              @Override
              protected void assertResult() throws Exception {
                  System.gc();
                  assertEquals(1, context.getObjectStore().registeredObjectsCount());
              }
          }.runTest(2000);
  
          context.commitChanges();
          new ParallelTestContainer() {
  
              @Override
              protected void assertResult() throws Exception {
                  System.gc();
                  assertEquals(0, context.getObjectStore().registeredObjectsCount());
              }
          }.runTest(2000);
  
      }
  }
  