/** From the operator we can get all the information we need */
  @Override
  public void initHook(Operator op) {
    this.opCanName = op.getClass().getCanonicalName();
    this.opName = op.getObjectLabel();
    this.ipAddress = op.getAttribute("ipAddress");

    // Where to we get the Operator Job ID?
    String strJobID = op.getAttribute("jobID");
    if (strJobID != null) {
      this.jobID = Integer.parseInt(strJobID);
    }
  }
  public void testPersistence() {

    // get new database instance
    Database myDatabase = Database.getInstance();

    // initialize table schema (empty schema)
    HashMap<String, Type> tableSchema = new HashMap<String, Type>();

    tableSchema.put("attribute1", Types.getCharType(5));
    tableSchema.put("attribute2", Types.getDateType());

    // start DB (should be empty before this stage)
    myDatabase.startSystem();

    // create 1 new table
    try {
      myDatabase.getStorageInterface().createTable(tName, tableSchema);
    } catch (TableAlreadyExistsException e) {
      fail("Table creation failed");
    }

    // shut down db (persist)
    myDatabase.shutdownSystem();

    // could completely shutdown application at this point (will be tested)

    // start system again
    myDatabase.startSystem();

    // get all tables stored
    Operator<Table> tablesOp = (Operator<Table>) myDatabase.getStorageInterface().getTables();

    tablesOp.open();
    Table t;
    int i = 0;
    for (i = 0; (t = tablesOp.next()) != null; i++) {

      assertEquals(tName, t.getTableName());

      // one table inserted
      assertEquals(i, 0);
    }

    tablesOp.close();

    if (i != 1) {

      fail("Incorrect number of tables.");
    }
  }
  /*
   * (non-Javadoc)
   *
   * @see junit.framework.TestCase#tearDown()
   */
  protected void tearDown() throws Exception {

    super.tearDown();

    // DB is a singleton, remove all tables between runs
    Database myDatabase = Database.getInstance();

    myDatabase.startSystem();

    Operator<Table> op = (Operator<Table>) myDatabase.getStorageInterface().getTables();

    op.open();

    Table t;

    while ((t = op.next()) != null) {

      myDatabase.getStorageInterface().deleteTable(t.getTableName());
    }

    myDatabase.shutdownSystem();

    // After test is done, remove all persisted tables for next tests
    File directory = new File("disk/");

    // Get all files in directory

    File[] files = directory.listFiles();
    for (File file : files) {

      System.out.println(file.getName());

      if (!file.delete()) {

        System.out.println("Failed to delete " + file);
      }
    }
  }