Land Recent QUIC Changes.

net/tools/quic/quic_packet_writer_wrapper.h

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_TOOLS_QUIC_QUIC_PACKET_WRITER_WRAPPER_H_
+#define NET_TOOLS_QUIC_QUIC_PACKET_WRITER_WRAPPER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "net/quic/quic_packet_writer.h"
+
+namespace net {
+
+namespace tools {
+
+// Wraps a writer object to allow dynamically extending functionality. Use
+// cases: replace writer while dispatcher and connections hold on to the
+// wrapper; mix in monitoring in internal server; mix in mocks in unit tests.
+class QuicPacketWriterWrapper : public net::QuicPacketWriter {
+ public:
+  QuicPacketWriterWrapper();
+  explicit QuicPacketWriterWrapper(QuicPacketWriter* writer);
+  virtual ~QuicPacketWriterWrapper();
+
+  // Default implementation of the QuicPacketWriter interface. Passes everything
+  // to |writer_|.
+  virtual WriteResult WritePacket(
+      const char* buffer,
+      size_t buf_len,
+      const IPAddressNumber& self_address,
+      const IPEndPoint& peer_address,
+      QuicBlockedWriterInterface* blocked_writer) OVERRIDE;
+  virtual bool IsWriteBlockedDataBuffered() const OVERRIDE;
+  virtual bool IsWriteBlocked() const OVERRIDE;
+  virtual void SetWritable() OVERRIDE;
+
+  // Takes ownership of |writer|.
+  void set_writer(QuicPacketWriter* writer);
+
+  // Releases ownership of |writer_|.
+  QuicPacketWriter* release_writer();
+
+ private:
+  scoped_ptr<QuicPacketWriter> writer_;
+
+  DISALLOW_COPY_AND_ASSIGN(QuicPacketWriterWrapper);
+};
+
+}  // namespace tools
+}  // namespace net
+
+#endif  // NET_TOOLS_QUIC_QUIC_PACKET_WRITER_WRAPPER_H_