public static void main(String[] args) throws Exception {
    DistributedSystem system = DistributedSystem.connect(new java.util.Properties());
    Cache cache = CacheFactory.create(system);
    AttributesFactory factory = new AttributesFactory();
    factory.setEvictionAttributes(EvictionAttributes.createLRUMemoryAttributes(2,
        null, EvictionAction.OVERFLOW_TO_DISK));
    DiskStoreFactory dsf = cache.createDiskStoreFactory();
    File user_dir = new File(System.getProperty("user.dir"));
    if (!user_dir.exists()) {
      user_dir.mkdir();
    }
    File[] dirs1 = new File[] {user_dir};
    DiskStore ds1 = dsf.setDiskDirs(dirs1).create("TestDiskRegion");
    factory.setDiskStoreName("TestDiskRegion");
    LocalRegion region = (LocalRegion) cache.createRegion("TestDiskRegion", factory.create());
    DiskRegion dr = region.getDiskRegion();
    Assert.assertTrue(dr != null);
    DiskRegionStats diskStats = dr.getStats();
    EvictionCounters lruStats = getLRUStats(region);
    Assert.assertTrue(diskStats != null);
    Assert.assertTrue(lruStats != null);

    // Put some small stuff
    for (int i = 0; i < 10; i++) {
      region.put(i, String.valueOf(i));
    }

    Assert.assertTrue(diskStats.getWrites() == 0);
    Assert.assertTrue(diskStats.getReads() == 0);
    Assert.assertTrue(lruStats.getEvictions() == 0);

    // // Make sure we can get them back okay
    // for (int i = 0; i < 10; i++) {
    // Object value = region.get(new Integer(i));
    // Assert.assertTrue(value != null);
    // Assert.assertTrue(String.valueOf(i).equals(value));
    // }

    // Put in larger stuff until we start evicting
    int total;
    for (total = 0; lruStats.getEvictions() <= 0; total++) {
      System.out.println("total puts " + total + ", evictions " + lruStats.getEvictions()
          + ", total entry size " + lruStats.getCounter());
      int[] array = new int[250];
      array[0] = total;
      region.put(total, array);
    }

    Assert.assertTrue(diskStats.getWrites() == 1);
    Assert.assertTrue(diskStats.getReads() == 0);
    Assert.assertTrue(lruStats.getEvictions() == 1);

    System.out.println("----------  Finished Putting -------------");

    Object value = region.get(0);
    Assert.assertTrue(value != null);
    Assert.assertTrue(((int[]) value)[0] == 0);

    Assert.assertTrue(diskStats.getWrites() == 2, String.valueOf(diskStats.getWrites()));
    Assert.assertTrue(diskStats.getReads() == 1);
    Assert.assertTrue(lruStats.getEvictions() == 2, String.valueOf(lruStats.getEvictions()));

    System.out.println("----------  Getting ALL -------------");

    for (int i = 0; i < total; i++) {
      System.out.println("total gets " + i + ", evictions " + lruStats.getEvictions()
          + ", total entry size " + lruStats.getCounter());

      int[] array = (int[]) region.get(i);
      Assert.assertTrue(array != null);
      Assert.assertTrue(i == array[0]);
    }

    System.out.println("---------  Updating  --------------");

    long startEvictions = lruStats.getEvictions();
    for (int i = 0; i < 10; i++) {
      region.put(i, new int[251]);
      long expected = startEvictions + 1 + i;
      long actual = lruStats.getEvictions();
      Assert.assertTrue(expected == actual,
          "For " + i + " expected " + expected + ", got " + actual);
    }

    System.out.println("Done.  Waiting for stats to be written...");
    Thread.sleep(5 * 1000);
  }
Returns the <code>EvictionStatistics</code> for the given region
geode-core/src/test/java/org/apache/geode/cache30/TestDiskRegion.java