Refactoring: Create per-connection packet writers in QuicDispatcher.

net/tools/quic/test_tools/quic_test_utils.cc

Index: net/tools/quic/test_tools/quic_test_utils.cc
diff --git a/net/tools/quic/test_tools/quic_test_utils.cc b/net/tools/quic/test_tools/quic_test_utils.cc
index 255fbc0a3c12ac141385365230e56ab8dded92a1..5b0f56c0dc1876662cf87960dabd89891ffaabd1 100644
--- a/net/tools/quic/test_tools/quic_test_utils.cc
+++ b/net/tools/quic/test_tools/quic_test_utils.cc
@@ -18,12 +18,25 @@ namespace net {
 namespace tools {
 namespace test {
 
+namespace {
+class NiceMockPacketWriterFactory
+    : public QuicConnection::PacketWriterFactory {
+ public:
+  virtual ~NiceMockPacketWriterFactory() {}
+
+  virtual QuicPacketWriter* Create(
+      QuicConnection* /*connection*/) const override {
+    return new testing::NiceMock<MockPacketWriter>();
+  }
+};
+}  // namespace
+
 MockConnection::MockConnection(bool is_server)
     : QuicConnection(kTestConnectionId,
                      IPEndPoint(net::test::Loopback4(), kTestPort),
                      new testing::NiceMock<MockHelper>(),
-                     new testing::NiceMock<MockPacketWriter>(),
-                     true  /* owns_writer */,
+                     NiceMockPacketWriterFactory(),
+                     /* owns_writer= */ true,
                      is_server, QuicSupportedVersions()),
       helper_(helper()) {
 }
@@ -32,8 +45,8 @@ MockConnection::MockConnection(IPEndPoint address,
                                bool is_server)
     : QuicConnection(kTestConnectionId, address,
                      new testing::NiceMock<MockHelper>(),
-                     new testing::NiceMock<MockPacketWriter>(),
-                     true  /* owns_writer */,
+                     NiceMockPacketWriterFactory(),
+                     /* owns_writer= */ true,
                      is_server, QuicSupportedVersions()),
       helper_(helper()) {
 }
@@ -43,8 +56,8 @@ MockConnection::MockConnection(QuicConnectionId connection_id,
     : QuicConnection(connection_id,
                      IPEndPoint(net::test::Loopback4(), kTestPort),
                      new testing::NiceMock<MockHelper>(),
-                     new testing::NiceMock<MockPacketWriter>(),
-                     true  /* owns_writer */,
+                     NiceMockPacketWriterFactory(),
+                     /* owns_writer= */ true,
                      is_server, QuicSupportedVersions()),
       helper_(helper()) {
 }
@@ -54,8 +67,8 @@ MockConnection::MockConnection(bool is_server,
     : QuicConnection(kTestConnectionId,
                      IPEndPoint(net::test::Loopback4(), kTestPort),
                      new testing::NiceMock<MockHelper>(),
-                     new testing::NiceMock<MockPacketWriter>(),
-                     true  /* owns_writer */,
+                     NiceMockPacketWriterFactory(),
+                     /* owns_writer= */ true,
                      is_server, QuicSupportedVersions()),
       helper_(helper()) {
 }
@@ -112,6 +125,54 @@ MockAckNotifierDelegate::MockAckNotifierDelegate() {
 MockAckNotifierDelegate::~MockAckNotifierDelegate() {
 }
 
+TestWriterFactory::TestWriterFactory() : current_writer_(NULL) {}
+TestWriterFactory::~TestWriterFactory() {}
+
+QuicPacketWriter* TestWriterFactory::Create(QuicPacketWriter* writer,
+                                            QuicConnection* connection) {
+  return new PerConnectionPacketWriter(this, writer, connection);
+}
+
+void TestWriterFactory::OnPacketSent(WriteResult result) {
+  if (current_writer_ != NULL) {
+    current_writer_->connection()->OnPacketSent(result);
+    current_writer_ = NULL;
+  }
+}
+
+void TestWriterFactory::Unregister(PerConnectionPacketWriter* writer) {
+  if (current_writer_ == writer) {
+    current_writer_ = NULL;
+  }
+}
+
+TestWriterFactory::PerConnectionPacketWriter::PerConnectionPacketWriter(
+    TestWriterFactory* factory,
+    QuicPacketWriter* writer,
+    QuicConnection* connection)
+    : QuicPerConnectionPacketWriter(writer, connection),
+      factory_(factory) {
+}
+
+TestWriterFactory::PerConnectionPacketWriter::~PerConnectionPacketWriter() {
+  factory_->Unregister(this);
+}
+
+WriteResult TestWriterFactory::PerConnectionPacketWriter::WritePacket(
+    const char* buffer,
+    size_t buf_len,
+    const IPAddressNumber& self_address,
+    const IPEndPoint& peer_address) {
+  // A DCHECK(factory_current_writer_ == NULL) would be wrong here -- this class
+  // may be used in a setting where connection()->OnPacketSent() is called in a
+  // different way, so TestWriterFactory::OnPacketSent might never be called.
+  factory_->current_writer_ = this;
+  return QuicPerConnectionPacketWriter::WritePacket(buffer,
+                                                    buf_len,
+                                                    self_address,
+                                                    peer_address);
+}
+
 }  // namespace test
 }  // namespace tools
 }  // namespace net