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c-expirable.js
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c-expirable.js
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'use strict'
;
const
PROMISE_TIMEOUT
=
1000
;
class
Expirable
{
constructor
(
executor
)
{
const
promise
=
new
Promise
(
(
resolve
,
reject
)
=>
{
executor
(
(
val
)
=>
{
if
(
this
.
expired
)
return
;
clearTimeout
(
this
.
timer
)
;
resolve
(
val
)
;
}
,
(
err
)
=>
{
if
(
this
.
expired
)
return
;
clearTimeout
(
this
.
timer
)
;
reject
(
err
)
;
}
,
)
;
this
.
timer
=
setTimeout
(
(
)
=>
{
this
.
expired
=
true
;
reject
(
new
Error
(
'Expired'
)
)
;
}
,
PROMISE_TIMEOUT
)
;
}
)
;
this
.
promise
=
promise
;
this
.
expired
=
false
;
this
.
timer
=
null
;
return
this
.
promise
;
}
}
// Usage
new
Expirable
(
(
resolve
)
=>
{
setTimeout
(
(
)
=>
{
resolve
(
'Resolved before timeout'
)
;
}
,
100
)
;
}
)
.
then
(
(
data
)
=>
{
console
.
dir
(
{
data
}
)
;
}
)
.
catch
(
(
error
)
=>
{
console
.
dir
(
{
error
:
error
.
message
}
)
;
}
)
;
new
Expirable
(
(
resolve
,
reject
)
=>
{
setTimeout
(
(
)
=>
{
reject
(
new
Error
(
'Something went wrong'
)
)
;
}
,
100
)
;
}
)
.
then
(
(
data
)
=>
{
console
.
dir
(
{
data
}
)
;
}
)
.
catch
(
(
error
)
=>
{
console
.
dir
(
{
error
:
error
.
message
}
)
;
}
)
;
new
Expirable
(
(
resolve
)
=>
{
setTimeout
(
(
)
=>
{
resolve
(
'Never resolved before timeout'
)
;
}
,
2000
)
;
}
)
.
then
(
(
data
)
=>
{
console
.
dir
(
{
data
}
)
;
}
)
.
catch
(
(
error
)
=>
{
console
.
dir
(
{
error
:
error
.
message
}
)
;
}
)
;
new
Expirable
(
(
resolve
,
reject
)
=>
{
setTimeout
(
(
)
=>
{
reject
(
new
Error
(
'Never rejected before timeout'
)
)
;
}
,
2000
)
;
}
)
.
then
(
(
data
)
=>
{
console
.
dir
(
{
data
}
)
;
}
)
.
catch
(
(
error
)
=>
{
console
.
dir
(
{
error
:
error
.
message
}
)
;
}
)
;
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