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
|
//
// AbstractObserver.h
//
// Library: Foundation
// Package: Notifications
// Module: NotificationCenter
//
// Definition of the AbstractObserver class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_AbstractObserver_INCLUDED
#define Foundation_AbstractObserver_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/Notification.h"
namespace Poco {
class Foundation_API AbstractObserver
/// The base class for all instantiations of
/// the Observer and NObserver template classes.
{
public:
AbstractObserver();
AbstractObserver(const AbstractObserver& observer);
virtual ~AbstractObserver();
AbstractObserver& operator = (const AbstractObserver& observer);
virtual void notify(Notification* pNf) const = 0;
virtual bool equals(const AbstractObserver& observer) const = 0;
POCO_DEPRECATED("use `Poco::Any accepts(Notification*)` instead")
virtual bool accepts(Notification* pNf, const char* pName) const = 0;
virtual bool accepts(const Notification::Ptr& pNf) const = 0;
virtual AbstractObserver* clone() const = 0;
virtual void start();
/// No-op.
/// This method can be implemented by inheriting classes which require
/// explicit start in order to begin processing notifications.
virtual void disable() = 0;
virtual int backlog() const;
/// Returns number of queued messages that this Observer has.
/// For non-active (synchronous) observers, always returns zero.
};
//
// inlines
//
inline void AbstractObserver::start()
{
}
inline int AbstractObserver::backlog() const
{
return 0;
}
} // namespace Poco
#endif // Foundation_AbstractObserver_INCLUDED
|
