1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/*
*
* Copyright 2014, 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 __GRPCPP_INTERNAL_STREAM_STREAM_CONTEXT_H__
#define __GRPCPP_INTERNAL_STREAM_STREAM_CONTEXT_H__
#include <grpc/grpc.h>
#include <grpc++/status.h>
#include <grpc++/stream_context_interface.h>
namespace google {
namespace protobuf {
class Message;
}
}
namespace grpc {
class ClientContext;
class RpcMethod;
class StreamContext final : public StreamContextInterface {
public:
StreamContext(const RpcMethod &method, ClientContext *context,
const google::protobuf::Message *request,
google::protobuf::Message *result);
StreamContext(const RpcMethod &method, grpc_call *call,
grpc_completion_queue *cq, google::protobuf::Message *request,
google::protobuf::Message *result);
~StreamContext();
// Start the stream, if there is a final write following immediately, set
// buffered so that the messages can be sent in batch.
void Start(bool buffered) override;
bool Read(google::protobuf::Message *msg) override;
bool Write(const google::protobuf::Message *msg, bool is_last) override;
const Status &Wait() override;
void Cancel() override;
google::protobuf::Message *request() override { return request_; }
google::protobuf::Message *response() override { return result_; }
private:
// Unique tags for plucking events from the c layer. this pointer is casted
// to char* to create single byte step between tags. It implicitly relies on
// that StreamContext is large enough to contain all the pointers.
void *finished_tag() { return reinterpret_cast<char *>(this); }
void *read_tag() { return reinterpret_cast<char *>(this) + 1; }
void *write_tag() { return reinterpret_cast<char *>(this) + 2; }
void *halfclose_tag() { return reinterpret_cast<char *>(this) + 3; }
void *invoke_tag() { return reinterpret_cast<char *>(this) + 4; }
void *client_metadata_read_tag() {
return reinterpret_cast<char *>(this) + 5;
}
grpc_call *call() { return call_; }
grpc_completion_queue *cq() { return cq_; }
bool is_client_;
const RpcMethod *method_; // not owned
grpc_call *call_; // not owned
grpc_completion_queue *cq_; // not owned
google::protobuf::Message *request_; // first request, not owned
google::protobuf::Message *result_; // last response, not owned
bool peer_halfclosed_;
bool self_halfclosed_;
Status final_status_;
};
} // namespace grpc
#endif // __GRPCPP_INTERNAL_STREAM_STREAM_CONTEXT_H__
|
