/**
* Determines whether {@link #runInConnectThread(DTLSProtocol, TlsPeer, DatagramTransport)} is to
* try to establish a DTLS connection.
*
* @param i the number of tries remaining after the current one
* @param datagramTransport
* @return <tt>true</tt> to try to establish a DTLS connection; otherwise, <tt>false</tt>
*/
private boolean enterRunInConnectThreadLoop(int i, DatagramTransport datagramTransport) {
if (i < 0 || i > CONNECT_TRIES) {
return false;
} else {
Thread currentThread = Thread.currentThread();
synchronized (this) {
if (i > 0 && i < CONNECT_TRIES - 1) {
boolean interrupted = false;
try {
wait(CONNECT_RETRY_INTERVAL);
} catch (InterruptedException ie) {
interrupted = true;
}
if (interrupted) currentThread.interrupt();
}
return currentThread.equals(this.connectThread)
&& datagramTransport.equals(this.datagramTransport);
}
}
}
/** Starts this <tt>PacketTransformer</tt>. */
private synchronized void start() {
if (this.datagramTransport != null) {
if (this.connectThread == null && dtlsTransport == null) {
logger.warn(
getClass().getName()
+ " has been started but has failed to establish"
+ " the DTLS connection!");
}
return;
}
if (rtcpmux && Component.RTCP == componentID) {
// In the case of rtcp-mux, the RTCP transformer does not create
// a DTLS session. The SRTP context (_srtpTransformer) will be
// initialized on demand using initializeSRTCPTransformerFromRtp().
return;
}
AbstractRTPConnector connector = this.connector;
if (connector == null) throw new NullPointerException("connector");
DtlsControl.Setup setup = this.setup;
SecureRandom secureRandom = DtlsControlImpl.createSecureRandom();
final DTLSProtocol dtlsProtocolObj;
final TlsPeer tlsPeer;
if (DtlsControl.Setup.ACTIVE.equals(setup)) {
dtlsProtocolObj = new DTLSClientProtocol(secureRandom);
tlsPeer = new TlsClientImpl(this);
} else {
dtlsProtocolObj = new DTLSServerProtocol(secureRandom);
tlsPeer = new TlsServerImpl(this);
}
tlsPeerHasRaisedCloseNotifyWarning = false;
final DatagramTransportImpl datagramTransport = new DatagramTransportImpl(componentID);
datagramTransport.setConnector(connector);
Thread connectThread =
new Thread() {
@Override
public void run() {
try {
runInConnectThread(dtlsProtocolObj, tlsPeer, datagramTransport);
} finally {
if (Thread.currentThread().equals(DtlsPacketTransformer.this.connectThread)) {
DtlsPacketTransformer.this.connectThread = null;
}
}
}
};
connectThread.setDaemon(true);
connectThread.setName(DtlsPacketTransformer.class.getName() + ".connectThread");
this.connectThread = connectThread;
this.datagramTransport = datagramTransport;
boolean started = false;
try {
connectThread.start();
started = true;
} finally {
if (!started) {
if (connectThread.equals(this.connectThread)) this.connectThread = null;
if (datagramTransport.equals(this.datagramTransport)) this.datagramTransport = null;
}
}
notifyAll();
}