blob: 8ccb4863878a22ce2a4b166436b07dc1c65fca1e (
plain) (
blame)
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
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/idestructorcallback.h>
#include <atomic>
namespace storage::spi { class Result; }
namespace proton {
typedef std::unique_ptr<storage::spi::Result> ResultUP;
namespace feedtoken {
/**
* This class is used by the FeedEngine to encapsulate the necessary information
* for an IFeedHandler to perform an async reply to an operation. A unique
* instance of this class is passed to every invokation of the IFeedHandler.
*/
class ITransport {
public:
virtual ~ITransport() { }
virtual void send(ResultUP result, bool documentWasFound) = 0;
};
/**
* This holds the result of the feed operation until it is either failed or acked.
* Guarantees that the result is propagated back to the invoker via ITransport interface.
*/
class State : public vespalib::IDestructorCallback {
public:
State(const State &) = delete;
State & operator = (const State &) = delete;
State(ITransport & transport);
~State() override;
void fail();
void setResult(ResultUP result, bool documentWasFound);
const storage::spi::Result &getResult() { return *_result; }
protected:
void ack();
private:
ITransport &_transport;
ResultUP _result;
bool _documentWasFound;
std::atomic<bool> _alreadySent;
};
/**
* This takes ownership ov the transport object, so that it can be used fully asynchronous
* without invoker needing to hold any state.
*/
class OwningState : public State {
public:
OwningState(std::shared_ptr<ITransport> transport)
: State(*transport),
_owned(std::move(transport))
{}
~OwningState() override;
private:
std::shared_ptr<ITransport> _owned;
};
inline std::shared_ptr<State>
make(ITransport & latch) {
return std::make_shared<State>(latch);
}
inline std::shared_ptr<State>
make(std::shared_ptr<ITransport> transport) {
return std::make_shared<OwningState>(std::move(transport));
}
}
using FeedToken = std::shared_ptr<feedtoken::State>;
} // namespace proton
|
