/**
* Unwatches an event.
*
* @param name event name
* @throws IOException I/O exception
*/
public void unwatch(final String name) throws IOException {
out.write(11);
send(name);
info = receive();
if (!ok()) throw new IOException(info);
notifiers.remove(name);
}
/**
* Watches an event.
*
* @param name event name
* @param notifier event notification
* @throws IOException I/O exception
*/
public void watch(final String name, final EventNotifier notifier) throws IOException {
out.write(10);
if (esocket == null) {
final int eport = Integer.parseInt(receive());
// initialize event socket
esocket = new Socket();
esocket.connect(new InetSocketAddress(ehost, eport), 5000);
final OutputStream os = esocket.getOutputStream();
receive(in, os);
os.write(0);
os.flush();
final InputStream is = esocket.getInputStream();
is.read();
listen(is);
}
send(name);
info = receive();
if (!ok()) throw new IOException(info);
notifiers.put(name, notifier);
}
/**
* Sends a command, argument, and input.
*
* @param cmd command
* @param path path to document
* @param input xml input
* @throws IOException I/O exception
*/
private void send(final int cmd, final String path, final InputStream input) throws IOException {
out.write(cmd);
send(path);
send(input);
}
/**
* Receives a string and writes it to the specified output stream.
*
* @param is input stream
* @param os output stream
* @throws IOException I/O exception
*/
static void receive(final InputStream is, final OutputStream os) throws IOException {
for (int b; (b = is.read()) > 0; ) {
// read next byte if 0xFF is received
os.write(b == 0xFF ? is.read() : b);
}
}
/**
* Sends a string to the server.
*
* @param s string to be sent
* @throws IOException I/O exception
*/
void send(final String s) throws IOException {
out.write((s + '\0').getBytes(UTF8));
}
/**
* Checks the next success flag.
*
* @return value of check
* @throws IOException Exception
*/
boolean ok() throws IOException {
out.flush();
return in.read() == 0;
}
/**
* Closes the session.
*
* @throws IOException Exception
*/
public void close() throws IOException {
send("exit");
out.flush();
if (esocket != null) esocket.close();
socket.close();
}
