/** Requests an HTTP resource and returns its response as a string */
public static String request(String httpUrl, Transaction tx) throws IOException {
checkTransaction(tx);
DataBuffer buffer = new DataBuffer(256, false);
InputStream is = null;
Connection conn = null;
try {
// append connection suffix
httpUrl += getConnectionSuffix();
Logger.log("Opening URL: " + httpUrl);
conn = Connector.open(httpUrl);
tx.setNetworkOperation(conn, is);
if (conn instanceof HttpConnection) {
HttpConnection httpConn = (HttpConnection) conn;
int responseCode = httpConn.getResponseCode();
is = httpConn.openInputStream();
tx.setNetworkOperation(conn, is);
int length = is.read(buffer.getArray());
buffer.setLength(length);
String response =
new String(buffer.getArray(), buffer.getArrayStart(), buffer.getArrayLength());
if (responseCode == 200) {
Logger.log("HTTP response: " + response);
return response;
} else {
Logger.warn("HTTP error response: " + response);
throw new IOException("Http error: " + responseCode + ", " + response);
}
} else {
throw new IOException("Can not make HTTP connection for URL '" + httpUrl + "'");
}
} finally {
PushUtils.close(conn, is, null);
tx.clearNetworkOperation();
}
}
/** Safely closes connection and streams */
public static void close(Connection conn, InputStream is, OutputStream os) {
if (os != null) {
try {
os.close();
} catch (IOException e) {
}
}
if (is != null) {
try {
is.close();
} catch (IOException e) {
}
}
if (conn != null) {
try {
conn.close();
} catch (IOException e) {
}
}
}
public void run() {
StreamConnection stream = null;
InputStream input = null;
MDSPushInputStream pushInputStream = null;
while (!_stop) {
try {
// Synchronize here so that we don't end up creating a connection that is never closed.
synchronized (this) {
// Open the connection once (or re-open after an IOException), so we don't end up
// in a race condition, where a push is lost if it comes in before the connection
// is open again. We open the url with a parameter that indicates that we should
// always use MDS when attempting to connect.
int port = RhoConf.getInstance().getInt("push_port");
if (port == 0) port = 100;
_notify = (StreamConnectionNotifier) Connector.open(URL + port + ";deviceside=false");
}
while (!_stop) {
// NOTE: the following will block until data is received.
LOG.TRACE("Block push thread until data is recieved");
stream = _notify.acceptAndOpen();
LOG.TRACE("Recieved push data");
try {
input = stream.openInputStream();
pushInputStream = new MDSPushInputStream((HttpServerConnection) stream, input);
// Extract the data from the input stream.
DataBuffer db = new DataBuffer();
byte[] data = new byte[CHUNK_SIZE];
int chunk = 0;
while (-1 != (chunk = input.read(data))) {
db.write(data, 0, chunk);
}
processPushMessage(data);
// This method is called to accept the push.
pushInputStream.accept();
input.close();
stream.close();
data = db.getArray();
} catch (IOException e1) {
// A problem occurred with the input stream , however, the original
// StreamConnectionNotifier is still valid.
System.err.println(e1.toString());
if (input != null) {
try {
input.close();
} catch (IOException e2) {
}
}
if (stream != null) {
try {
stream.close();
} catch (IOException e2) {
}
}
}
}
_notify.close();
_notify = null;
} catch (IOException ioe) {
LOG.TRACE("Exception thrown by _notify.acceptAndOpen() - exiting push thread");
// Likely the stream was closed. Catches the exception thrown by
// _notify.acceptAndOpen() when this program exits.
_stop = true;
if (_notify != null) {
try {
_notify.close();
_notify = null;
} catch (IOException e) {
}
}
}
}
}