Adding OrtcFactory, and changing UdpTransport to match current plan.

webrtc/api/ortcfactory.h

+/*
+ *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_API_ORTCFACTORY_H_
+#define WEBRTC_API_ORTCFACTORY_H_
+
+#include <memory>
+
+#include "webrtc/api/udptransportinterface.h"
+#include "webrtc/base/network.h"
+#include "webrtc/base/thread.h"
+#include "webrtc/p2p/base/packetsocketfactory.h"
+
+namespace webrtc {
+
+// WARNING: This is experimental/under development, so use at your own risk; no
+// guarantee about API stability is guaranteed here yet.
+//
+// This class is the ORTC analog of PeerConnectionFactory. It acts as a factory
+// for ORTC objects that can be connected to each other.
+//
+// Some of these objects may not be represented by the ORTC specification, but
+// follow the same general principles.
+//
+// On object lifetimes: The factory should not be destroyed before destroying
+// the objects it created, and the objects passed into the factory should not
+// be destroyed before destroying the factory (since it doesn't take
+// ownership).
+class OrtcFactory {
+ public:
+  // |network_thread| is the thread on which packets are sent and received.
+  // If null, a new rtc::Thread with a default socket server is created.
+  //
+  // |worker_thread| is used for CPU-intensive operations.
+  // If null, a new rtc::Thread is created.
+  //
+  // |signaling_thread| is used for callbacks to the consumer of the API. If
+  // null, the current thread will be used, which assumes that the API consumer
+  // is running a message loop on this thread (either using an existing
+  // rtc::Thread, or by calling rtc::Thread::Current()->ProcessMessages).
+  //
+  // |network_manager| is used to determine which network interfaces are
+  // available. This is used for ICE, for example. If null, a default
+  // implementation will be used. Only accessed on |network_thread|.
+  //
+  // |socket_factory| is used (on the network thread) for creating sockets. If
+  // it's null, a default implementation will be used, which assumes
+  // |network_thread| is a normal rtc::Thread.
+  //
+  // Note that the OrtcFactory does not take ownership of any of the objects
+  // passed in.
+  OrtcFactory(rtc::Thread* network_thread,
+              rtc::Thread* worker_thread,
+              rtc::Thread* signaling_thread,
+              rtc::NetworkManager* network_manager,
+              rtc::PacketSocketFactory* socket_factory);
+  // Constructor for convenience which uses default implementations of
+  // everything (though does still require that the current thread runs a
+  // message loop; see above).
+  OrtcFactory() : OrtcFactory(nullptr, nullptr, nullptr, nullptr, nullptr) {}
+  ~OrtcFactory();
+
+  // Create a UDP transport with IP address family |family|, using a port
+  // within the specified range.
+  //
+  // |family| must be AF_INET or AF_INET6.
+  //
+  // |min_port|/|max_port| values of 0 indicate no range restriction.
+  //
+  // Returns nullptr if the transport wasn't successfully created.
+  std::unique_ptr<UdpTransportInterface> CreateUdpTransport(int family,
+                                                            uint16_t min_port,
+                                                            uint16_t max_port);
+  // Method for convenience that has no port range restrictions.
+  std::unique_ptr<UdpTransportInterface> CreateUdpTransport(int family) {
+    return CreateUdpTransport(family, 0, 0);
+  }
+
+ private:
+  rtc::Thread* network_thread_;
+  rtc::Thread* worker_thread_;
+  rtc::Thread* signaling_thread_;
+  rtc::NetworkManager* network_manager_;
+  rtc::PacketSocketFactory* socket_factory_;
+  // Which of these objects do we own (we constructed a default implementation)
+  // vs. were passed in?
+  bool owns_network_thread_ = false;
+  bool owns_worker_thread_ = false;
+  bool wraps_signaling_thread_ = false;
+  bool owns_network_manager_ = false;
+  bool owns_socket_factory_ = false;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_API_ORTCFACTORY_H_