Async server streaming

include/grpc++/stream.h

@@ -574,8 +574,8 @@ class ClientAsyncReaderWriter final : public ClientAsyncStreamingInterface,
 template <class W>
 class ServerAsyncResponseWriter final : public ServerAsyncStreamingInterface {
  public:
-  ServerAsyncResponseWriter(Call* call, ServerContext* ctx)
-      : call_(call), ctx_(ctx) {}
+  explicit ServerAsyncResponseWriter(ServerContext* ctx)
+      : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
 
   void SendInitialMetadata(void* tag) {
     GPR_ASSERT(!ctx_->sent_initial_metadata_);
@@ -583,7 +583,7 @@ class ServerAsyncResponseWriter final : public ServerAsyncStreamingInterface {
     meta_buf_.Reset(tag);
     meta_buf_.AddSendInitialMetadata(&ctx_->initial_metadata_);
     ctx_->sent_initial_metadata_ = true;
-    call_->PerformOps(&meta_buf_);
+    call_.PerformOps(&meta_buf_);
   }
 
   void Finish(const W& msg, const Status& status, void* tag) {
@@ -599,7 +599,7 @@ class ServerAsyncResponseWriter final : public ServerAsyncStreamingInterface {
     bool cancelled = false;
     finish_buf_.AddServerRecvClose(&cancelled);
     finish_buf_.AddServerSendStatus(&ctx_->trailing_metadata_, status);
-    call_->PerformOps(&finish_buf_);
+    call_.PerformOps(&finish_buf_);
   }
 
   void FinishWithError(const Status& status, void* tag) {
@@ -612,11 +612,13 @@ class ServerAsyncResponseWriter final : public ServerAsyncStreamingInterface {
     bool cancelled = false;
     finish_buf_.AddServerRecvClose(&cancelled);
     finish_buf_.AddServerSendStatus(&ctx_->trailing_metadata_, status);
-    call_->PerformOps(&finish_buf_);
+    call_.PerformOps(&finish_buf_);
   }
 
  private:
-  Call* call_;
+  void BindCall(Call *call) override { call_ = *call; }
+
+  Call call_;
   ServerContext* ctx_;
   CallOpBuffer meta_buf_;
   CallOpBuffer finish_buf_;
@@ -626,8 +628,8 @@ template <class R>
 class ServerAsyncReader : public ServerAsyncStreamingInterface,
                           public AsyncReaderInterface<R> {
  public:
-  ServerAsyncReader(Call* call, ServerContext* ctx)
-      : call_(call), ctx_(ctx) {}
+  explicit ServerAsyncReader(ServerContext* ctx)
+      : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
 
   void SendInitialMetadata(void* tag) override {
     GPR_ASSERT(!ctx_->sent_initial_metadata_);
@@ -635,13 +637,13 @@ class ServerAsyncReader : public ServerAsyncStreamingInterface,
     meta_buf_.Reset(tag);
     meta_buf_.AddSendInitialMetadata(&ctx_->initial_metadata_);
     ctx_->sent_initial_metadata_ = true;
-    call_->PerformOps(&meta_buf_);
+    call_.PerformOps(&meta_buf_);
   }
 
   void Read(R* msg, void* tag) override {
     read_buf_.Reset(tag);
     read_buf_.AddRecvMessage(msg);
-    call_->PerformOps(&read_buf_);
+    call_.PerformOps(&read_buf_);
   }
 
   void Finish(const Status& status, void* tag) override {
@@ -653,12 +655,14 @@ class ServerAsyncReader : public ServerAsyncStreamingInterface,
     bool cancelled = false;
     finish_buf_.AddServerRecvClose(&cancelled);
     finish_buf_.AddServerSendStatus(&ctx_->trailing_metadata_, status);
-    call_->PerformOps(&finish_buf_);
+    call_.PerformOps(&finish_buf_);
   }
 
 
  private:
-  Call* call_;
+  void BindCall(Call *call) override { call_ = *call; }
+
+  Call call_;
   ServerContext* ctx_;
   CallOpBuffer meta_buf_;
   CallOpBuffer read_buf_;
@@ -669,8 +673,8 @@ template <class W>
 class ServerAsyncWriter : public ServerAsyncStreamingInterface,
                           public AsyncWriterInterface<W> {
  public:
-  ServerAsyncWriter(Call* call, ServerContext* ctx)
-      : call_(call), ctx_(ctx) {}
+  explicit ServerAsyncWriter(ServerContext* ctx)
+      : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
 
   void SendInitialMetadata(void* tag) override {
     GPR_ASSERT(!ctx_->sent_initial_metadata_);
@@ -678,7 +682,7 @@ class ServerAsyncWriter : public ServerAsyncStreamingInterface,
     meta_buf_.Reset(tag);
     meta_buf_.AddSendInitialMetadata(&ctx_->initial_metadata_);
     ctx_->sent_initial_metadata_ = true;
-    call_->PerformOps(&meta_buf_);
+    call_.PerformOps(&meta_buf_);
   }
 
   void Write(const W& msg, void* tag) override {
@@ -688,7 +692,7 @@ class ServerAsyncWriter : public ServerAsyncStreamingInterface,
       ctx_->sent_initial_metadata_ = true;
     }
     write_buf_.AddSendMessage(msg);
-    call_->PerformOps(&write_buf_);
+    call_.PerformOps(&write_buf_);
   }
 
   void Finish(const Status& status, void* tag) override {
@@ -700,11 +704,13 @@ class ServerAsyncWriter : public ServerAsyncStreamingInterface,
     bool cancelled = false;
     finish_buf_.AddServerRecvClose(&cancelled);
     finish_buf_.AddServerSendStatus(&ctx_->trailing_metadata_, status);
-    call_->PerformOps(&finish_buf_);
+    call_.PerformOps(&finish_buf_);
   }
 
  private:
-  Call* call_;
+  void BindCall(Call *call) override { call_ = *call; }
+
+  Call call_;
   ServerContext* ctx_;
   CallOpBuffer meta_buf_;
   CallOpBuffer write_buf_;
@@ -717,8 +723,8 @@ class ServerAsyncReaderWriter : public ServerAsyncStreamingInterface,
                                 public AsyncWriterInterface<W>,
                                 public AsyncReaderInterface<R> {
  public:
-  ServerAsyncReaderWriter(Call* call, ServerContext* ctx)
-      : call_(call), ctx_(ctx) {}
+  explicit ServerAsyncReaderWriter(ServerContext* ctx)
+      : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
 
   void SendInitialMetadata(void* tag) override {
     GPR_ASSERT(!ctx_->sent_initial_metadata_);
@@ -726,13 +732,13 @@ class ServerAsyncReaderWriter : public ServerAsyncStreamingInterface,
     meta_buf_.Reset(tag);
     meta_buf_.AddSendInitialMetadata(&ctx_->initial_metadata_);
     ctx_->sent_initial_metadata_ = true;
-    call_->PerformOps(&meta_buf_);
+    call_.PerformOps(&meta_buf_);
   }
 
   virtual void Read(R* msg, void* tag) override {
     read_buf_.Reset(tag);
     read_buf_.AddRecvMessage(msg);
-    call_->PerformOps(&read_buf_);
+    call_.PerformOps(&read_buf_);
   }
 
   virtual void Write(const W& msg, void* tag) override {
@@ -742,7 +748,7 @@ class ServerAsyncReaderWriter : public ServerAsyncStreamingInterface,
       ctx_->sent_initial_metadata_ = true;
     }
     write_buf_.AddSendMessage(msg);
-    call_->PerformOps(&write_buf_);
+    call_.PerformOps(&write_buf_);
   }
 
   void Finish(const Status& status, void* tag) override {
@@ -754,11 +760,13 @@ class ServerAsyncReaderWriter : public ServerAsyncStreamingInterface,
     bool cancelled = false;
     finish_buf_.AddServerRecvClose(&cancelled);
     finish_buf_.AddServerSendStatus(&ctx_->trailing_metadata_, status);
-    call_->PerformOps(&finish_buf_);
+    call_.PerformOps(&finish_buf_);
   }
 
  private:
-  Call* call_;
+  void BindCall(Call *call) override { call_ = *call; }
+
+  Call call_;
   ServerContext* ctx_;
   CallOpBuffer meta_buf_;
   CallOpBuffer read_buf_;