Пример #1
0
  /**
   * Executes the command, prints the result to the specified output stream and returns a success
   * flag.
   *
   * @param ctx database context
   * @param os output stream
   * @return success flag. The {@link #info()} method returns information on a potential exception
   */
  private boolean exec(final Context ctx, final OutputStream os) {
    // check if data reference is available
    final Data dt = ctx.data();
    if (dt == null && data) return error(NO_DB_OPENED);

    // check permissions
    if (!ctx.perm(perm, dt != null ? dt.meta : null)) return error(PERM_REQUIRED_X, perm);

    // set updating flag
    updating = updating(ctx);

    try {
      // register process
      ctx.register(this);
      // run command and return success flag
      return run(ctx, os);
    } finally {
      // guarantee that process will be unregistered
      ctx.unregister(this);
    }
  }
Пример #2
0
 /**
  * Closes the specified database if it is currently opened and only pinned once.
  *
  * @param ctx database context
  * @param db database to be closed
  * @return closed flag
  */
 protected static boolean close(final Context ctx, final String db) {
   final boolean close =
       ctx.data() != null && db.equals(ctx.data().meta.name) && ctx.dbs.pins(db) == 1;
   return close && new Close().run(ctx);
 }