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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
// This file is part of CAF, the C++ Actor Framework. See the file LICENSE in
// the main distribution directory for license terms and copyright or visit
// https://github.com/actor-framework/actor-framework/blob/master/LICENSE.
#pragma once
#include <cstdint>
#include <utility>
#include <vector>
#include "caf/actor_addr.hpp"
#include "caf/actor_control_block.hpp"
#include "caf/detail/core_export.hpp"
#include "caf/detail/type_list.hpp"
#include "caf/message.hpp"
#include "caf/stream_priority.hpp"
#include "caf/stream_slot.hpp"
#include "caf/tag/boxing_type.hpp"
#include "caf/variant.hpp"
namespace caf {
/// Transmits stream data.
struct downstream_msg_batch {
/// Allows the testing DSL to unbox this type automagically.
using outer_type = downstream_msg;
/// Size of the type-erased vector<T> (used credit).
int32_t xs_size;
/// A type-erased vector<T> containing the elements of the batch.
message xs;
/// ID of this batch (ascending numbering).
int64_t id;
};
/// Orderly shuts down a stream after receiving an ACK for the last batch.
struct downstream_msg_close {
/// Allows the testing DSL to unbox this type automagically.
using outer_type = downstream_msg;
};
/// Propagates a fatal error from sources to sinks.
struct downstream_msg_forced_close {
/// Allows the testing DSL to unbox this type automagically.
using outer_type = downstream_msg;
/// Reason for shutting down the stream.
error reason;
};
/// Stream messages that travel downstream, i.e., batches and close messages.
struct CAF_CORE_EXPORT downstream_msg : tag::boxing_type {
// -- nested types -----------------------------------------------------------
using batch = downstream_msg_batch;
using close = downstream_msg_close;
using forced_close = downstream_msg_forced_close;
// -- member types -----------------------------------------------------------
/// Lists all possible options for the payload.
using alternatives = detail::type_list<batch, close, forced_close>;
/// Stores one of `alternatives`.
using content_type = variant<batch, close, forced_close>;
// -- constructors, destructors, and assignment operators --------------------
template <class T>
downstream_msg(stream_slots s, actor_addr addr, T&& x)
: slots(s), sender(std::move(addr)), content(std::forward<T>(x)) {
// nop
}
downstream_msg() = default;
downstream_msg(downstream_msg&&) = default;
downstream_msg(const downstream_msg&) = default;
downstream_msg& operator=(downstream_msg&&) = default;
downstream_msg& operator=(const downstream_msg&) = default;
// -- member variables -------------------------------------------------------
/// ID of the affected stream.
stream_slots slots;
/// Address of the sender. Identifies the up- or downstream actor sending
/// this message. Note that abort messages can get send after `sender`
/// already terminated. Hence, `current_sender()` can be `nullptr`, because
/// no strong pointers can be formed any more and receiver would receive an
/// anonymous message.
actor_addr sender;
/// Palyoad of the message.
content_type content;
};
/// Allows the testing DSL to unbox `downstream_msg` automagically.
template <class T>
const T& get(const downstream_msg& x) {
return get<T>(x.content);
}
/// Allows the testing DSL to check whether `downstream_msg` holds a `T`.
template <class T>
bool is(const downstream_msg& x) {
return holds_alternative<T>(x.content);
}
/// @relates downstream_msg
template <class T, class... Ts>
detail::enable_if_tt<detail::tl_contains<downstream_msg::alternatives, T>,
downstream_msg>
make(stream_slots slots, actor_addr addr, Ts&&... xs) {
return {slots, std::move(addr), T{std::forward<Ts>(xs)...}};
}
/// @relates downstream_msg::batch
template <class Inspector>
bool inspect(Inspector& f, downstream_msg::batch& x) {
return f.object(x).pretty_name("batch").fields(f.field("size", x.xs_size),
f.field("xs", x.xs),
f.field("id", x.id));
}
/// @relates downstream_msg::close
template <class Inspector>
bool inspect(Inspector& f, downstream_msg::close& x) {
return f.object(x).pretty_name("close").fields();
}
/// @relates downstream_msg::forced_close
template <class Inspector>
bool inspect(Inspector& f, downstream_msg::forced_close& x) {
return f.object(x)
.pretty_name("forced_close")
.fields(f.field("reason", x.reason));
}
/// @relates downstream_msg
template <class Inspector>
bool inspect(Inspector& f, downstream_msg& x) {
return f.object(x)
.pretty_name("downstream_msg")
.fields(f.field("slots", x.slots), f.field("sender", x.sender),
f.field("content", x.content));
}
} // namespace caf
|
