/**
  * Wait until there are no more threads accessing the database. It is assumed that new threads
  * have been prevented from entering the database at the time this method is called.
  */
 private void waitUntilQuiescent() {
   while (threadTotalCount.get() > 0) {
     // Still have threads in the database so sleep a little
     try {
       Thread.sleep(500);
     } catch (InterruptedException e) {
       if (debugEnabled()) {
         TRACER.debugCaught(DebugLogLevel.ERROR, e);
       }
     }
   }
 }
  /** Tests the maximum persistent search limit imposed by the server. */
  @Test
  public void testMaxPSearch() throws Exception {
    TestCaseUtils.initializeTestBackend(true);
    // Modify the configuration to allow only 1 concurrent persistent search.
    InternalClientConnection conn = getRootConnection();

    LDAPAttribute attr = new LDAPAttribute("ds-cfg-max-psearches", "1");

    ArrayList<RawModification> mods = new ArrayList<>();
    mods.add(new LDAPModification(ModificationType.REPLACE, attr));

    ModifyOperation modifyOperation = conn.processModify(ByteString.valueOf("cn=config"), mods);
    assertEquals(modifyOperation.getResultCode(), ResultCode.SUCCESS);

    // Create a persistent search request.
    Set<PersistentSearchChangeType> changeTypes = EnumSet.of(ADD, DELETE, MODIFY, MODIFY_DN);
    SearchRequest request =
        newSearchRequest(DN.valueOf("o=test"), SearchScope.BASE_OBJECT)
            .setTypesOnly(true)
            .addAttribute("cn")
            .addControl(new PersistentSearchControl(changeTypes, true, true));
    final InternalSearchOperation search = conn.processSearch(request);

    Thread t =
        new Thread(
            new Runnable() {
              @Override
              public void run() {
                try {
                  search.run();
                } catch (Exception ex) {
                }
              }
            },
            "Persistent Search Test");
    t.start();
    t.join(2000);
    // Create a persistent search request.
    final String[] args = {
      "-D",
      "cn=Directory Manager",
      "-w",
      "password",
      "-h",
      "127.0.0.1",
      "-p",
      String.valueOf(TestCaseUtils.getServerLdapPort()),
      "-b",
      "o=test",
      "-s",
      "sub",
      "-C",
      "ps:add:true:true",
      "--noPropertiesFile",
      "(objectClass=*)"
    };

    assertEquals(LDAPSearch.mainSearch(args, false, true, null, System.err), 11);
    // cancel the persisting persistent search.
    search.cancel(new CancelRequest(true, LocalizableMessage.EMPTY));
  }