private boolean filterSourceData(Message msg) {
        if (extendedHandler != null) {
            return extendedHandler.filterMessage(msg);
        }
        return true;
    }
Returns the name of the thread, used to identify different data sources

@return source data list
inlong-agent/agent-plugins/src/main/java/org/apache/inlong/agent/plugin/sources/file/AbstractSource.java