question: @ Override public void endRDF ( ) throws RDFHandlerException { logger . info ( "Finished parsing RDF" ) ; try { statementCache . put ( DONE ) ; } catch ( InterruptedException e ) { throw new RDFHandlerException ( "Interrupted while waiting to add done signal to statement queue" , e ) ; } }
target:  Add a dummy item to the queue to signal that there will be no more statements.