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import
{
autobind
}
from
'../lib/helpers'
;
import
AsyncQueue
from
'../lib/async-queue'
;
class
Task
{
constructor
(
name
,
error
)
{
autobind
(
this
,
'run'
,
'finish'
)
;
this
.
name
=
name
;
this
.
error
=
error
;
this
.
started
=
false
;
this
.
finished
=
false
;
}
run
(
)
{
this
.
started
=
true
;
this
.
finished
=
false
;
return
new
Promise
(
(
resolve
,
reject
)
=>
{
this
.
resolve
=
resolve
;
this
.
reject
=
reject
;
}
)
;
}
finish
(
)
{
this
.
finished
=
true
;
if
(
this
.
error
)
{
this
.
reject
(
new
Error
(
this
.
name
)
)
;
}
else
{
this
.
resolve
(
this
.
name
)
;
}
}
}
describe
(
'AsyncQueue'
,
function
(
)
{
it
(
'runs items in parallel up to the set max'
,
async
function
(
)
{
const
queue
=
new
AsyncQueue
(
{
parallelism
:
3
}
)
;
const
tasks
=
[
new
Task
(
'task 1'
)
,
new
Task
(
'task 2'
,
true
)
,
new
Task
(
'task 3'
)
,
new
Task
(
'task 4'
)
,
new
Task
(
'task 5'
)
,
]
;
const
results
=
[
false
,
false
,
false
,
false
,
false
]
;
const
errors
=
[
false
,
false
,
false
,
false
,
false
]
;
const
p0
=
queue
.
push
(
(
)
=>
tasks
[
0
]
.
run
(
)
)
;
const
p1
=
queue
.
push
(
(
)
=>
tasks
[
1
]
.
run
(
)
)
;
const
p2
=
queue
.
push
(
(
)
=>
tasks
[
2
]
.
run
(
)
)
;
const
p3
=
queue
.
push
(
(
)
=>
tasks
[
3
]
.
run
(
)
)
;
const
p4
=
queue
.
push
(
(
)
=>
tasks
[
4
]
.
run
(
)
)
;
p0
.
then
(
value
=>
{
results
[
0
]
=
value
;
}
)
.
catch
(
err
=>
{
errors
[
0
]
=
err
;
}
)
;
p1
.
then
(
value
=>
{
results
[
1
]
=
value
;
}
)
.
catch
(
err
=>
{
errors
[
1
]
=
err
;
}
)
;
p2
.
then
(
value
=>
{
results
[
2
]
=
value
;
}
)
.
catch
(
err
=>
{
errors
[
2
]
=
err
;
}
)
;
p3
.
then
(
value
=>
{
results
[
3
]
=
value
;
}
)
.
catch
(
err
=>
{
errors
[
3
]
=
err
;
}
)
;
p4
.
then
(
value
=>
{
results
[
4
]
=
value
;
}
)
.
catch
(
err
=>
{
errors
[
4
]
=
err
;
}
)
;
assert
.
isTrue
(
tasks
[
0
]
.
started
)
;
assert
.
isTrue
(
tasks
[
1
]
.
started
)
;
assert
.
isTrue
(
tasks
[
2
]
.
started
)
;
assert
.
isFalse
(
tasks
[
3
]
.
started
)
;
assert
.
isFalse
(
tasks
[
4
]
.
started
)
;
assert
.
isFalse
(
results
[
0
]
)
;
tasks
[
0
]
.
finish
(
)
;
assert
.
isTrue
(
tasks
[
0
]
.
finished
)
;
await
assert
.
async
.
equal
(
results
[
0
]
,
'task 1'
)
;
assert
.
isFalse
(
tasks
[
1
]
.
finished
)
;
assert
.
isFalse
(
results
[
1
]
)
;
assert
.
isTrue
(
tasks
[
3
]
.
started
)
;
assert
.
isFalse
(
tasks
[
4
]
.
started
)
;
tasks
[
1
]
.
finish
(
)
;
assert
.
isTrue
(
tasks
[
1
]
.
finished
)
;
assert
.
isFalse
(
tasks
[
2
]
.
finished
)
;
await
assert
.
async
.
equal
(
errors
[
1
]
.
message
,
'task 2'
)
;
assert
.
isTrue
(
tasks
[
4
]
.
started
)
;
}
)
;
it
(
'runs non-parallelizable tasks serially'
,
async
function
(
)
{
const
queue
=
new
AsyncQueue
(
{
parallelism
:
3
}
)
;
const
tasks
=
[
new
Task
(
'task 1'
)
,
new
Task
(
'task 2'
)
,
new
Task
(
'task 3'
)
,
new
Task
(
'task 4'
)
,
new
Task
(
'task 5'
)
,
new
Task
(
'task 6'
)
,
]
;
const
p0
=
queue
.
push
(
(
)
=>
tasks
[
0
]
.
run
(
)
)
;
const
p1
=
queue
.
push
(
(
)
=>
tasks
[
1
]
.
run
(
)
)
;
const
p2
=
queue
.
push
(
(
)
=>
tasks
[
2
]
.
run
(
)
,
{
parallel
:
false
}
)
;
const
p3
=
queue
.
push
(
(
)
=>
tasks
[
3
]
.
run
(
)
,
{
parallel
:
false
}
)
;
queue
.
push
(
(
)
=>
tasks
[
4
]
.
run
(
)
)
;
queue
.
push
(
(
)
=>
tasks
[
5
]
.
run
(
)
)
;
assert
.
isTrue
(
tasks
[
0
]
.
started
)
;
assert
.
isTrue
(
tasks
[
1
]
.
started
)
;
assert
.
isFalse
(
tasks
[
2
]
.
started
)
;
// not parallelizable!!
assert
.
isFalse
(
tasks
[
3
]
.
started
)
;
assert
.
isFalse
(
tasks
[
4
]
.
started
)
;
assert
.
isFalse
(
tasks
[
5
]
.
started
)
;
tasks
[
0
]
.
finish
(
)
;
await
p0
;
assert
.
isFalse
(
tasks
[
2
]
.
started
)
;
// still can't be started
assert
.
isFalse
(
tasks
[
3
]
.
started
)
;
tasks
[
1
]
.
finish
(
)
;
await
p1
;
await
assert
.
async
.
isTrue
(
tasks
[
2
]
.
started
)
;
assert
.
isFalse
(
tasks
[
3
]
.
started
)
;
// still can't be started
tasks
[
2
]
.
finish
(
)
;
await
p2
;
await
assert
.
async
.
isTrue
(
tasks
[
3
]
.
started
)
;
assert
.
isFalse
(
tasks
[
4
]
.
started
)
;
// 3 is non-parallelizable so 4 can't start
tasks
[
3
]
.
finish
(
)
;
await
p3
;
await
assert
.
async
.
isTrue
(
tasks
[
4
]
.
started
)
;
// both can start since they are parallelizable
assert
.
isTrue
(
tasks
[
5
]
.
started
)
;
}
)
;
it
(
'continues to work when tasks throw synchronous errors'
,
async
function
(
)
{
const
queue
=
new
AsyncQueue
(
{
parallelism
:
1
}
)
;
const
p1
=
queue
.
push
(
(
)
=>
{
throw
new
Error
(
'error thrown from task 1'
)
;
}
)
;
const
p2
=
queue
.
push
(
(
)
=>
{
return
new
Promise
(
res
=>
res
(
2
)
)
;
}
)
;
try
{
await
p1
;
throw
new
Error
(
'expected p1 to be rejectd'
)
;
}
catch
(
err
)
{
}
assert
.
equal
(
await
p2
,
2
)
;
}
)
;
}
)
;
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