Initial checkin of gRPC to third_party/

third_party/grpc/include/grpc++/channel.h

+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPCXX_CHANNEL_H
+#define GRPCXX_CHANNEL_H
+
+#include <memory>
+
+#include <grpc++/impl/call.h>
+#include <grpc++/impl/codegen/channel_interface.h>
+#include <grpc++/impl/codegen/config.h>
+#include <grpc++/impl/codegen/grpc_library.h>
+#include <grpc/grpc.h>
+
+struct grpc_channel;
+
+namespace grpc {
+/// Channels represent a connection to an endpoint. Created by \a CreateChannel.
+class Channel GRPC_FINAL : public ChannelInterface,
+                           public CallHook,
+                           public std::enable_shared_from_this<Channel>,
+                           private GrpcLibrary {
+ public:
+  ~Channel();
+
+  /// Get the current channel state. If the channel is in IDLE and
+  /// \a try_to_connect is set to true, try to connect.
+  grpc_connectivity_state GetState(bool try_to_connect) GRPC_OVERRIDE;
+
+ private:
+  template <class InputMessage, class OutputMessage>
+  friend Status BlockingUnaryCall(ChannelInterface* channel,
+                                  const RpcMethod& method,
+                                  ClientContext* context,
+                                  const InputMessage& request,
+                                  OutputMessage* result);
+  friend std::shared_ptr<Channel> CreateChannelInternal(
+      const grpc::string& host, grpc_channel* c_channel);
+  Channel(const grpc::string& host, grpc_channel* c_channel);
+
+  Call CreateCall(const RpcMethod& method, ClientContext* context,
+                  CompletionQueue* cq) GRPC_OVERRIDE;
+  void PerformOpsOnCall(CallOpSetInterface* ops, Call* call) GRPC_OVERRIDE;
+  void* RegisterMethod(const char* method) GRPC_OVERRIDE;
+
+  void NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,
+                               gpr_timespec deadline, CompletionQueue* cq,
+                               void* tag) GRPC_OVERRIDE;
+  bool WaitForStateChangeImpl(grpc_connectivity_state last_observed,
+                              gpr_timespec deadline) GRPC_OVERRIDE;
+
+  const grpc::string host_;
+  grpc_channel* const c_channel_;  // owned
+};
+
+}  // namespace grpc
+
+#endif  // GRPCXX_CHANNEL_H