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				|  |  | +/*
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				|  |  | + *
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				|  |  | + * Copyright 2016, Google Inc.
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				|  |  | + * All rights reserved.
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				|  |  | + *
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				|  |  | + * Redistribution and use in source and binary forms, with or without
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				|  |  | + * modification, are permitted provided that the following conditions are
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				|  |  | + * met:
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				|  |  | + *
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				|  |  | + *     * Redistributions of source code must retain the above copyright
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				|  |  | + * notice, this list of conditions and the following disclaimer.
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				|  |  | + *     * Redistributions in binary form must reproduce the above
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				|  |  | + * copyright notice, this list of conditions and the following disclaimer
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				|  |  | + * in the documentation and/or other materials provided with the
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				|  |  | + * distribution.
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				|  |  | + *     * Neither the name of Google Inc. nor the names of its
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				|  |  | + * contributors may be used to endorse or promote products derived from
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				|  |  | + * this software without specific prior written permission.
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				|  |  | + *
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				|  |  | + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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				|  |  | + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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				|  |  | + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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				|  |  | + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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				|  |  | + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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				|  |  | + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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				|  |  | + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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				|  |  | + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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				|  |  | + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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				|  |  | + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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				|  |  | + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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				|  |  | + *
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				|  |  | + */
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				|  |  | +
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				|  |  | +#ifndef GRPCXX_IMPL_CODEGEN_FC_UNARY_H
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				|  |  | +#define GRPCXX_IMPL_CODEGEN_FC_UNARY_H
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				|  |  | +
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				|  |  | +#include <grpc++/impl/codegen/call.h>
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				|  |  | +#include <grpc++/impl/codegen/core_codegen_interface.h>
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				|  |  | +#include <grpc++/impl/codegen/server_context.h>
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				|  |  | +
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				|  |  | +namespace grpc {
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				|  |  | +
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				|  |  | +/// A class to represent a flow-controlled unary call. This is something
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				|  |  | +/// of a hybrid between conventional unary and streaming. This is invoked
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				|  |  | +/// through a unary call on the client side, but the server responds to it
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				|  |  | +/// as though it were a single-ping-pong streaming call. The server can use
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				|  |  | +/// the \a Size method to determine an upper-bound on the size of the message
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				|  |  | +/// A key difference relative to streaming: an FCUnary must have exactly 1 Read
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				|  |  | +/// and exactly 1 Write, in that order, to function correctly.
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				|  |  | +/// Otherwise, the RPC is in error
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				|  |  | +template <class RequestType, class ResponseType>
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				|  |  | +  class FCUnary GRPC_FINAL {
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				|  |  | + public:
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				|  |  | + FCUnary(Call* call, ServerContext* ctx, int max_message_size): call_(call), ctx_(ctx), max_msg_size_(max_message_size), read_done_(false), write_done_(false) {}
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				|  |  | +  ~FCUnary() {}
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				|  |  | +  uint32_t Size() {return max_msg_size_;}
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				|  |  | +  bool Read(RequestType *request) {
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				|  |  | +    if (read_done_) {
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				|  |  | +      return false;      
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				|  |  | +    }
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				|  |  | +    read_done_ = true;
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				|  |  | +    CallOpSet<CallOpRecvMessage<RequestType>> ops;
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				|  |  | +    ops.RecvMessage(request);
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				|  |  | +    call_->PerformOps(&ops);
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				|  |  | +    return call_->cq()->Pluck(&ops) && ops.got_message;
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				|  |  | +  }
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				|  |  | +  bool Write(const ResponseType& response) {return Write(response, WriteOptions());}
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				|  |  | +  bool Write(const ResponseType& response, const WriteOptions& options) {
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				|  |  | +    if (write_done_ || !read_done_) {
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				|  |  | +      return false;      
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				|  |  | +    }
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				|  |  | +    write_done_ = true;
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				|  |  | +    CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage> ops;
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				|  |  | +    if (!ops.SendMessage(response, options).ok()) {
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				|  |  | +      return false;
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				|  |  | +    }
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				|  |  | +    if (!ctx_->sent_initial_metadata_) {
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				|  |  | +      ops.SendInitialMetadata(ctx_->initial_metadata_,
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				|  |  | +                              ctx_->initial_metadata_flags());
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				|  |  | +      ctx_->sent_initial_metadata_ = true;
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				|  |  | +    } else {
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				|  |  | +      return false;
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				|  |  | +    }
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				|  |  | +    call_->PerformOps(&ops);
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				|  |  | +    return call_->cq()->Pluck(&ops);    
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				|  |  | +  }
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				|  |  | + private:
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				|  |  | +  Call* const call_;
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				|  |  | +  ServerContext* const ctx_;
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				|  |  | +  const int max_msg_size_;
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				|  |  | +  bool read_done_;
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				|  |  | +  bool write_done_;
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				|  |  | +};
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				|  |  | +
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				|  |  | +}  // namespace grpc
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				|  |  | +
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				|  |  | +#endif  // GRPCXX_IMPL_CODEGEN_FC_UNARY_H
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