library/cpp/messagebus/actor/queue_for_actor.h


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

#pragma once

#include <util/generic/vector.h>
#include <util/system/yassert.h>
#include <util/thread/lfstack.h>
#include <util/thread/singleton.h>

// TODO: include from correct directory
#include "temp_tls_vector.h"

namespace NActor {
    namespace NPrivate { 
        struct TTagForTl {}; 

    } 

    template <typename T> 
    class TQueueForActor { 
    private: 
        TLockFreeStack<T> Queue; 

    public: 
        ~TQueueForActor() { 
            Y_VERIFY(Queue.IsEmpty()); 
        } 

        bool IsEmpty() { 
            return Queue.IsEmpty(); 
        } 

        void Enqueue(const T& value) { 
            Queue.Enqueue(value); 
        } 

        template <typename TCollection> 
        void EnqueueAll(const TCollection& all) { 
            Queue.EnqueueAll(all); 
        } 

        void Clear() { 
            TVector<T> tmp; 
            Queue.DequeueAll(&tmp); 
        } 

        template <typename TFunc> 
        void DequeueAll(const TFunc& func 
                        // TODO: , std::enable_if_t<TFunctionParamCount<TFunc>::Value == 1>* = 0 
        ) { 
            TTempTlsVector<T> temp; 

            Queue.DequeueAllSingleConsumer(temp.GetVector()); 

            for (typename TVector<T>::reverse_iterator i = temp.GetVector()->rbegin(); i != temp.GetVector()->rend(); ++i) { 
                func(*i); 
            } 

            temp.Clear(); 

            if (temp.Capacity() * sizeof(T) > 64 * 1024) { 
                temp.Shrink(); 
            } 
        }

        template <typename TFunc> 
        void DequeueAllLikelyEmpty(const TFunc& func) { 
            if (Y_LIKELY(IsEmpty())) { 
                return; 
            } 

            DequeueAll(func); 
        }
    }; 

}