This is in regards to shell mode.
I wish to be able to optimize performance, mainly in regards to
receiving data back from the output stream. This is code I have
cobbled together from examples. It reads both STDIN and STDERR. I
assume the only way to optimize would be to decrease the thread wait
time on reading from the channels. But, maybe someone has done
performance optimization and has some insights that I may be missing.
Code snippet:
out = channel.getOutputStream();
in = channel.getInputStream();
err = channel.getExtInputStream();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
out.write(command.getBytes());
out.flush();
.
.
.
private static String send(InputStream in, InputStream err, byte[]
buffer, ByteArrayOutputStream bos, ChannelShell channel){
int exitStatus = 0;
try {
final long endTime = System.currentTimeMillis() + TIMEOUT;
while (System.currentTimeMillis() < endTime) {
while (in.available() > 0) {
int count = in.read(buffer, 0, DEFAULT_BUFFER_SIZE);
if (count >= 0) {
bos.write(buffer, 0, count);
} else {
break;
}
}
while (err.available() > 0) {
int count = err.read(buffer, 0, DEFAULT_BUFFER_SIZE);
if (count >= 0) {
bos.write(buffer, 0, count);
} else {
break;
}
}
if (channel.isClosed()) {
exitStatus = channel.getExitStatus();
break;
}
try {
//Thread.sleep(POLL_TIMEOUT);
Thread.sleep(1000);
} catch (InterruptedException e) {
//("Ignoring interrupt.");
}
}
} catch (IOException ioe) {
// TODO: Add catch code
ioe.printStackTrace();
}
bos.reset();
return bos.toString();;
}
Also, can these affect performance:
session.connect(3 * 1000); // making a connection with timeout.
channel.connect(3 * 1000);
TIA!
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