/** 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(); }