Java InputStream blocking read

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The underlying data source for some implementations of InputStream can signal that the end of the stream has been reached, and no more data will be sent. Until this signal is received, read operations on such a stream can block.

For example, an InputStream from a Socket socket will block, rather than returning EOF, until a TCP packet with the FIN flag set is received. When EOF is received from such a stream, you can be assured that all data sent on that socket has been reliably received, and you won’t be able to read any more data. (If a blocking read results in an exception, on the other hand, some data may have been lost.)

Other streams, like those from a raw file or serial port, may lack a similar format or protocol to indicate that no more data will be available. Such streams can immediately return EOF (-1) rather than blocking when no data are currently available. In the absence of such a format or protocol, however, you can’t be sure when the other side is done sending data.

With regard to your second question, it sounds like you may have had a race condition. Without seeing the code in question, I’m guessing that the problem actually lay in your method of “display”. Perhaps the attempt to display by the second notification was somehow clobbering the work done during the first notification.

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