How to use

getContainers

method

in

org.apache.zookeeper.server.DataTree

protected Collection<String> getCandidates() {
  Set<String> candidates = new HashSet<String>();
  for (String containerPath : zkDb.getDataTree().getContainers()) {
    DataNode node = zkDb.getDataTree().getNode(containerPath);

@Test(timeout = 30000)
public void testMultiWithContainerSimple()
    throws KeeperException, InterruptedException {
  Op createContainer = Op.create("/foo", new byte[0],
      ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.CONTAINER);
  zk.multi(Collections.singletonList(createContainer));
  DataTree dataTree = serverFactory.getZooKeeperServer().getZKDatabase().getDataTree();
  Assert.assertEquals(dataTree.getContainers().size(), 1);
}

@Test(timeout = 30000)
public void testMultiWithContainer()
    throws KeeperException, InterruptedException {
  Op createContainer = Op.create("/foo", new byte[0],
      ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.CONTAINER);
  Op createChild = Op.create("/foo/bar", new byte[0],
      ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
  zk.multi(Arrays.asList(createContainer, createChild));
  DataTree dataTree = serverFactory.getZooKeeperServer().getZKDatabase().getDataTree();
  Assert.assertEquals(dataTree.getContainers().size(), 1);
  zk.delete("/foo/bar", -1);  // should cause "/foo" to get deleted when checkContainers() is called
  ContainerManager containerManager = new ContainerManager(serverFactory.getZooKeeperServer()
      .getZKDatabase(), serverFactory.getZooKeeperServer().firstProcessor, 1, 100);
  containerManager.checkContainers();
  Thread.sleep(1000);
  Assert.assertNull("Container should have been deleted", zk.exists("/foo", false));
  createContainer = Op.create("/foo", new byte[0],
      ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.CONTAINER);
  createChild = Op.create("/foo/bar", new byte[0],
      ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
  Op deleteChild = Op.delete("/foo/bar", -1);
  zk.multi(Arrays.asList(createContainer, createChild, deleteChild));
  containerManager.checkContainers();
  Thread.sleep(1000);
  Assert.assertNull("Container should have been deleted", zk.exists("/foo", false));
}