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taskflow/examples/observer.cpp at master · slacy/taskflow · GitHub
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observer.cpp
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observer.cpp
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//
Demonstrates the use of observer to monitor worker activities.
#
include
<
taskflow/taskflow.hpp
>
struct
MyObserver
:
public
tf
::ObserverInterface {
MyObserver
(
const
std::string& name) {
std::cout <<
"
constructing observer
"
<< name <<
'
\n
'
;
}
//
set_up is a constructor-like method that will be called exactly once
//
passing the number of workers
void
set_up
(
size_t
num_workers)
override
final
{
std::cout <<
"
setting up observer with
"
<< num_workers <<
"
workers
\n
"
;
}
//
on_entry will be called before a worker runs a task
void
on_entry
(tf::WorkerView wv, tf::TaskView tv)
override
final
{
std::ostringstream oss;
oss <<
"
worker
"
<< wv.
id
() <<
"
ready to run
"
<< tv.
name
() <<
'
\n
'
;
std::cout << oss.
str
();
}
//
on_exit will be called after a worker completes a task
void
on_exit
(tf::WorkerView wv, tf::TaskView tv)
override
final
{
std::ostringstream oss;
oss <<
"
worker
"
<< wv.
id
() <<
"
finished running
"
<< tv.
name
() <<
'
\n
'
;
std::cout << oss.
str
();
}
};
int
main
(){
tf::Executor executor;
//
Create a taskflow of eight tasks
tf::Taskflow taskflow;
taskflow.
emplace
([] () { std::cout <<
"
1
\n
"
; }).
name
(
"
A
"
);
taskflow.
emplace
([] () { std::cout <<
"
2
\n
"
; }).
name
(
"
B
"
);
taskflow.
emplace
([] () { std::cout <<
"
3
\n
"
; }).
name
(
"
C
"
);
taskflow.
emplace
([] () { std::cout <<
"
4
\n
"
; }).
name
(
"
D
"
);
taskflow.
emplace
([] () { std::cout <<
"
5
\n
"
; }).
name
(
"
E
"
);
taskflow.
emplace
([] () { std::cout <<
"
6
\n
"
; }).
name
(
"
F
"
);
taskflow.
emplace
([] () { std::cout <<
"
7
\n
"
; }).
name
(
"
G
"
);
taskflow.
emplace
([] () { std::cout <<
"
8
\n
"
; }).
name
(
"
H
"
);
//
create a default observer
std::shared_ptr<MyObserver> observer = executor.
make_observer
<MyObserver>(
"
MyObserver
"
);
//
run the taskflow
executor.
run
(taskflow).
get
();
//
remove the observer (optional)
executor.
remove_observer
(
std::move
(observer));
return
0
;
}
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