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Groovy - threadedPrintStringBuffer

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  1. def threadedPrintStringBuffer( StringBuffer aStringBuffer, Boolean aStop = false ) {
  2. 	// useful for real-time printing of process output
  3. 	/*
  4. 		Example use:
  5. 			def pb      = new ProcessBuilder( 'cmd', '/c', 'dir' );
  6. 			def process = pb.start();
  7. 			def sb1     = new StringBuffer();
  8. 			process.consumeProcessOutput( sb1, sb1 );
  9. 			def stop = threadedPrintStringBuffer( sb1 );
  10. 			process.waitFor();
  11. 			stop = true;
  12. 	*/
  13. 	Thread.start {
  14. 		int sbOldSize = 0;
  15. 		int sbNewSize = 0;
  16. 		def nap    = { itNapTime = 100 -> Thread.sleep(itNapTime); } ;
  17. 		int sz, delta;
  18. 		def somethingToDo = {
  19. 			sz    = aStringBuffer.length();
  20. 			delta = sz - sbOldSize;
  21. 			(delta > 0); // return		
  22. 		} ;
  23. 		def doWork = {	
  24. 			sbNewSize = sz;
  25. 			System.out.print( aStringBuffer.substring( sbOldSize, sbNewSize-1 ) );
  26. 			System.out.flush(); // very important !!!
  27. 			sbOldSize = sbNewSize;
  28. 		} ;
  29.  
  30. 		while(true) {
  31. 			if ( somethingToDo() ) { doWork(); }
  32. 			nap();
  33. 			if ( aStop && !somethingToDo() ) { break; }
  34. 		} // end while	
  35. 	} // end Thread
  36. 	return aStop; // !!!
  37. }

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