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
|
// Copyright (C) 2011-2020 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef ASIOLINK_INTERVAL_TIMER_H
#define ASIOLINK_INTERVAL_TIMER_H 1
#include <boost/function.hpp>
#include <boost/shared_ptr.hpp>
#include <asiolink/io_service.h>
namespace isc {
namespace asiolink {
class IntervalTimerImpl;
/// \brief The \c IntervalTimer class is a wrapper for the ASIO
/// \c boost::asio::deadline_timer class.
///
/// This class is implemented to use \c boost::asio::deadline_timer as interval
/// timer.
///
/// \c setup() sets a timer to expire on (now + interval), a call back
/// function, and an interval mode.
///
/// \c IntervalTimerImpl::callback() is called by the timer when it expires.
///
/// The function calls the call back function set by \c setup() and if the
/// the interval mode indicates a repeating interval, will reschedule the
/// timer to expire in (now + interval) milliseconds.
///
/// The type of call back function is \c void(void).
///
/// The call back function will not be called if the instance of this class is
/// destroyed before the timer is expired.
///
/// Sample code:
/// \code
/// void function_to_call_back() {
/// // this function will be called periodically
/// }
/// int interval_in_milliseconds = 1000;
/// IOService io_service;
///
/// IntervalTimer intervalTimer(io_service);
/// intervalTimer.setup(function_to_call_back, interval_in_milliseconds);
/// io_service.run();
/// \endcode
class IntervalTimer {
public:
/// \name The type of timer callback function
typedef boost::function<void()> Callback;
/// \brief Defines possible timer modes used to setup a timer.
/// - REPEATING - Timer will reschedule itself after each expiration
/// - ONE_SHOT - Timer will expire after one interval and not reschedule.
enum Mode
{
REPEATING,
ONE_SHOT
};
///
/// \name Constructors and Destructor
///
/// Note: The copy constructor and the assignment operator are
/// intentionally defined as private, making this class non-copyable.
//@{
private:
IntervalTimer(const IntervalTimer& source);
IntervalTimer& operator=(const IntervalTimer& source);
public:
/// \brief The constructor with \c IOService.
///
/// This constructor may throw a standard exception if
/// memory allocation fails inside the method.
/// This constructor may also throw \c boost::system::system_error.
///
/// \param io_service A reference to an instance of IOService
IntervalTimer(IOService& io_service);
/// \brief The destructor.
///
/// This destructor never throws an exception.
///
/// On the destruction of this class the timer will be canceled
/// inside \c boost::asio::deadline_timer.
~IntervalTimer();
//@}
/// \brief Register timer callback function and interval.
///
/// This function sets callback function and interval in milliseconds.
/// Timer will actually start after calling \c IOService::run().
///
/// \param cbfunc A reference to a function \c void(void) to call back
/// when the timer is expired (should not be an empty functor)
/// \param interval Interval in milliseconds (greater than 0)
/// \param mode Determines if the timer will automatically reschedule after
/// each expiration (the default) or behave as a one-shot which will run
/// for a single interval and not reschedule.
///
/// Note: IntervalTimer will not pass \c boost::system::error_code to
/// call back function. In case the timer is canceled, the function
/// will not be called.
///
/// \throw isc::InvalidParameter cbfunc is empty
/// \throw isc::BadValue interval is less than or equal to 0
/// \throw isc::Unexpected internal runtime error
void setup(const Callback& cbfunc, const long interval,
const Mode& mode = REPEATING);
/// Cancel the timer.
///
/// If the timer has been set up, this method cancels any asynchronous
/// events waiting on the timer and stops the timer itself.
/// If the timer has already been canceled, this method effectively does
/// nothing.
///
/// This method never throws an exception.
void cancel();
/// Return the timer interval.
///
/// This method returns the timer interval in milliseconds if it's running;
/// if the timer has been canceled it returns 0.
///
/// This method never throws an exception.
long getInterval() const;
private:
boost::shared_ptr<IntervalTimerImpl> impl_;
};
typedef boost::shared_ptr<isc::asiolink::IntervalTimer> IntervalTimerPtr;
} // namespace asiolink
} // namespace isc
#endif // ASIOLINK_INTERVAL_TIMER_H
|
