SSE AppInputStream.avaible() returns 0 until first byte has been read

Question

Hi!
I am new to JSSE and have tried to enable an existing application
for SSE connections.
In some sample applications everything worked fine, but in the
existing application nothing happened.
I found out that my existing application uses InputStream.available()
to check if the input stream has already some bytes available
and does nothing if there are not any bytes available.
The problem is that the com.sun.net.ssl.internal.ssl.AppInputStream
which is returned by SSLSocket.getInputStream() returns 0 if I call
available() until a first byte has been read. This behaviour
blocks my application because it does not start to read before
some bytes are available.
Is this a bug or desired behaviour?
If this is a bug, is there any workaround or fix for this?
I looked already for existing posts or bug fixes but I only
found a post containing the same problem without any answer.
Thanx in advance for your help!
Bye,
Michael.

Answer 1

My workaround is to wrap the inputstream by a BufferedStream. As only a real "read" can determine if there is any data exist, you must do so. However, you do not want the read to be blocking, so the only way is to perform a pseudo read, timeout the read asap and reset the stream for your original program.
Example code:
public int available() throws IOException {
int avail = 0;
int oneByte = -1;
int timeout = 0;
if (mSocket != null && mSocket instanceof SSLSocket) {
     try {
          timeout = mSocket.getSoTimeout();
          mSocket.setSoTimeout(2);
          in.mark(256);
          oneByte = in.read();
          in.reset();
          avail = in.available();
     } catch (SocketTimeoutException e) {
          avail = 0;
     } finally {
          mSocket.setSoTimeout(timeout);
} else {
     avail = in.available();