Method setCancelled

Bolts/src/bolts/Task.java:617–621

Sets the cancelled flag on the task, throwing if the Task has already been completed.

()

     * Sets the cancelled flag on the task, throwing if the Task has already been completed.
     */
    public void setCancelled() {
      if (!trySetCancelled()) {
        throw new IllegalStateException("Cannot cancel a completed task.");
      }
    }

    /**
     * Sets the result of the Task, throwing if the Task has already been completed.