Adds listener to the listeners of this table. It receives events when columns are added or removed, as well as when values are set.
@param listener the listener that is to be added
Adds a listener that will be informed of when attributes on a download have been read / modified.
@param l The listener to add.
@param attr The torrent attribute to be notified about.
@param event_type The type of event to be notified of, as defined on {@link DownloadAttributeListener}.
@since 3.0.3.5
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