def METHOD_NAME(self):
    """
    Process incoming mobile navigation events.
    For forum-thread-viewed events, change their names to
    edx.forum.thread.viewed and manipulate their data to conform with
    edx.forum.thread.viewed event design.
    Throw out other events.
    """
    # Get event context dict
    # Throw out event if context nonexistent or wrong type
    context = self.get('context')
    if not isinstance(context, dict):
        raise EventEmissionExit()
    # Throw out event if it's not a forum thread view
    if _get_string(context, 'label', del_if_bad=False) != FORUM_THREAD_VIEWED_EVENT_LABEL:
        raise EventEmissionExit()
    # Change name and event type
    self['name'] = 'edx.forum.thread.viewed'
    self['event_type'] = self['name']
    # If no event data, set it to an empty dict
    if 'event' not in self:
        self['event'] = {}
        self.event = {}
    # Throw out the context dict within the event data
    # (different from the context dict extracted above)
    if 'context' in self.event:
        del self.event['context']
    # Parse out course key
    course_id_string = _get_string(context, 'course_id') if context else None
    course_id = None
    if course_id_string:
        try:
            course_id = CourseLocator.from_string(course_id_string)
        except InvalidKeyError:
            pass
    # Change 'thread_id' field to 'id'
    thread_id = _get_string(self.event, 'thread_id')
    if thread_id:
        del self.event['thread_id']
        self.event['id'] = thread_id
    # Change 'topic_id' to 'commentable_id'
    commentable_id = _get_string(self.event, 'topic_id')
    if commentable_id:
        del self.event['topic_id']
        self.event['commentable_id'] = commentable_id
    # Change 'action' to 'title' and truncate
    title = _get_string(self.event, 'action')
    if title is not None:
        del self.event['action']
        add_truncated_title_to_event_data(self.event, title)
    # Change 'author' to 'target_username'
    author = _get_string(self.event, 'author')
    if author is not None:
        del self.event['author']
        self.event['target_username'] = author
    # Load user
    username = _get_string(self, 'username')
    user = None
    if username:
        try:
            user = User.objects.get(username=username)
        except User.DoesNotExist:
            pass
    # If in a category, add category name and ID
    if course_id and commentable_id and user:
        id_map = get_cached_discussion_id_map_by_course_id(course_id, [commentable_id], user)
        if commentable_id in id_map:
            self.event['category_name'] = id_map[commentable_id]['title']
            self.event['category_id'] = commentable_id
    # Add thread URL
    if course_id and commentable_id and thread_id:
        url_kwargs = {
            'course_id': course_id_string,
            'discussion_id': commentable_id,
            'thread_id': thread_id
        }
        try:
            self.event['url'] = reverse('single_thread', kwargs=url_kwargs)
        except NoReverseMatch:
            pass
    # Add user's forum and course roles
    if course_id and user:
        self.event['user_forums_roles'] = [
            role.name for role in user.roles.filter(course_id=course_id)
        ]
        self.event['user_course_roles'] = [
            role.role for role in user.courseaccessrole_set.filter(course_id=course_id)
        ]
    # Add team ID
    if commentable_id:
        team = get_team(commentable_id)
        if team:
            self.event['team_id'] = team.team_id