mirror of
https://gitea.com/actions/setup-python.git
synced 2024-11-22 18:19:35 +01:00
233 lines
7.5 KiB
Markdown
233 lines
7.5 KiB
Markdown
# asynckit [](https://www.npmjs.com/package/asynckit)
|
|
|
|
Minimal async jobs utility library, with streams support.
|
|
|
|
[](https://travis-ci.org/alexindigo/asynckit)
|
|
[](https://travis-ci.org/alexindigo/asynckit)
|
|
[](https://ci.appveyor.com/project/alexindigo/asynckit)
|
|
|
|
[](https://coveralls.io/github/alexindigo/asynckit?branch=master)
|
|
[](https://david-dm.org/alexindigo/asynckit)
|
|
[](https://www.bithound.io/github/alexindigo/asynckit)
|
|
|
|
<!-- [](https://www.npmjs.com/package/reamde) -->
|
|
|
|
AsyncKit provides harness for `parallel` and `serial` iterators over list of items represented by arrays or objects.
|
|
Optionally it accepts abort function (should be synchronously return by iterator for each item), and terminates left over jobs upon an error event. For specific iteration order built-in (`ascending` and `descending`) and custom sort helpers also supported, via `asynckit.serialOrdered` method.
|
|
|
|
It ensures async operations to keep behavior more stable and prevent `Maximum call stack size exceeded` errors, from sync iterators.
|
|
|
|
| compression | size |
|
|
| :----------------- | -------: |
|
|
| asynckit.js | 12.34 kB |
|
|
| asynckit.min.js | 4.11 kB |
|
|
| asynckit.min.js.gz | 1.47 kB |
|
|
|
|
|
|
## Install
|
|
|
|
```sh
|
|
$ npm install --save asynckit
|
|
```
|
|
|
|
## Examples
|
|
|
|
### Parallel Jobs
|
|
|
|
Runs iterator over provided array in parallel. Stores output in the `result` array,
|
|
on the matching positions. In unlikely event of an error from one of the jobs,
|
|
will terminate rest of the active jobs (if abort function is provided)
|
|
and return error along with salvaged data to the main callback function.
|
|
|
|
#### Input Array
|
|
|
|
```javascript
|
|
var parallel = require('asynckit').parallel
|
|
, assert = require('assert')
|
|
;
|
|
|
|
var source = [ 1, 1, 4, 16, 64, 32, 8, 2 ]
|
|
, expectedResult = [ 2, 2, 8, 32, 128, 64, 16, 4 ]
|
|
, expectedTarget = [ 1, 1, 2, 4, 8, 16, 32, 64 ]
|
|
, target = []
|
|
;
|
|
|
|
parallel(source, asyncJob, function(err, result)
|
|
{
|
|
assert.deepEqual(result, expectedResult);
|
|
assert.deepEqual(target, expectedTarget);
|
|
});
|
|
|
|
// async job accepts one element from the array
|
|
// and a callback function
|
|
function asyncJob(item, cb)
|
|
{
|
|
// different delays (in ms) per item
|
|
var delay = item * 25;
|
|
|
|
// pretend different jobs take different time to finish
|
|
// and not in consequential order
|
|
var timeoutId = setTimeout(function() {
|
|
target.push(item);
|
|
cb(null, item * 2);
|
|
}, delay);
|
|
|
|
// allow to cancel "leftover" jobs upon error
|
|
// return function, invoking of which will abort this job
|
|
return clearTimeout.bind(null, timeoutId);
|
|
}
|
|
```
|
|
|
|
More examples could be found in [test/test-parallel-array.js](test/test-parallel-array.js).
|
|
|
|
#### Input Object
|
|
|
|
Also it supports named jobs, listed via object.
|
|
|
|
```javascript
|
|
var parallel = require('asynckit/parallel')
|
|
, assert = require('assert')
|
|
;
|
|
|
|
var source = { first: 1, one: 1, four: 4, sixteen: 16, sixtyFour: 64, thirtyTwo: 32, eight: 8, two: 2 }
|
|
, expectedResult = { first: 2, one: 2, four: 8, sixteen: 32, sixtyFour: 128, thirtyTwo: 64, eight: 16, two: 4 }
|
|
, expectedTarget = [ 1, 1, 2, 4, 8, 16, 32, 64 ]
|
|
, expectedKeys = [ 'first', 'one', 'two', 'four', 'eight', 'sixteen', 'thirtyTwo', 'sixtyFour' ]
|
|
, target = []
|
|
, keys = []
|
|
;
|
|
|
|
parallel(source, asyncJob, function(err, result)
|
|
{
|
|
assert.deepEqual(result, expectedResult);
|
|
assert.deepEqual(target, expectedTarget);
|
|
assert.deepEqual(keys, expectedKeys);
|
|
});
|
|
|
|
// supports full value, key, callback (shortcut) interface
|
|
function asyncJob(item, key, cb)
|
|
{
|
|
// different delays (in ms) per item
|
|
var delay = item * 25;
|
|
|
|
// pretend different jobs take different time to finish
|
|
// and not in consequential order
|
|
var timeoutId = setTimeout(function() {
|
|
keys.push(key);
|
|
target.push(item);
|
|
cb(null, item * 2);
|
|
}, delay);
|
|
|
|
// allow to cancel "leftover" jobs upon error
|
|
// return function, invoking of which will abort this job
|
|
return clearTimeout.bind(null, timeoutId);
|
|
}
|
|
```
|
|
|
|
More examples could be found in [test/test-parallel-object.js](test/test-parallel-object.js).
|
|
|
|
### Serial Jobs
|
|
|
|
Runs iterator over provided array sequentially. Stores output in the `result` array,
|
|
on the matching positions. In unlikely event of an error from one of the jobs,
|
|
will not proceed to the rest of the items in the list
|
|
and return error along with salvaged data to the main callback function.
|
|
|
|
#### Input Array
|
|
|
|
```javascript
|
|
var serial = require('asynckit/serial')
|
|
, assert = require('assert')
|
|
;
|
|
|
|
var source = [ 1, 1, 4, 16, 64, 32, 8, 2 ]
|
|
, expectedResult = [ 2, 2, 8, 32, 128, 64, 16, 4 ]
|
|
, expectedTarget = [ 0, 1, 2, 3, 4, 5, 6, 7 ]
|
|
, target = []
|
|
;
|
|
|
|
serial(source, asyncJob, function(err, result)
|
|
{
|
|
assert.deepEqual(result, expectedResult);
|
|
assert.deepEqual(target, expectedTarget);
|
|
});
|
|
|
|
// extended interface (item, key, callback)
|
|
// also supported for arrays
|
|
function asyncJob(item, key, cb)
|
|
{
|
|
target.push(key);
|
|
|
|
// it will be automatically made async
|
|
// even it iterator "returns" in the same event loop
|
|
cb(null, item * 2);
|
|
}
|
|
```
|
|
|
|
More examples could be found in [test/test-serial-array.js](test/test-serial-array.js).
|
|
|
|
#### Input Object
|
|
|
|
Also it supports named jobs, listed via object.
|
|
|
|
```javascript
|
|
var serial = require('asynckit').serial
|
|
, assert = require('assert')
|
|
;
|
|
|
|
var source = [ 1, 1, 4, 16, 64, 32, 8, 2 ]
|
|
, expectedResult = [ 2, 2, 8, 32, 128, 64, 16, 4 ]
|
|
, expectedTarget = [ 0, 1, 2, 3, 4, 5, 6, 7 ]
|
|
, target = []
|
|
;
|
|
|
|
var source = { first: 1, one: 1, four: 4, sixteen: 16, sixtyFour: 64, thirtyTwo: 32, eight: 8, two: 2 }
|
|
, expectedResult = { first: 2, one: 2, four: 8, sixteen: 32, sixtyFour: 128, thirtyTwo: 64, eight: 16, two: 4 }
|
|
, expectedTarget = [ 1, 1, 4, 16, 64, 32, 8, 2 ]
|
|
, target = []
|
|
;
|
|
|
|
|
|
serial(source, asyncJob, function(err, result)
|
|
{
|
|
assert.deepEqual(result, expectedResult);
|
|
assert.deepEqual(target, expectedTarget);
|
|
});
|
|
|
|
// shortcut interface (item, callback)
|
|
// works for object as well as for the arrays
|
|
function asyncJob(item, cb)
|
|
{
|
|
target.push(item);
|
|
|
|
// it will be automatically made async
|
|
// even it iterator "returns" in the same event loop
|
|
cb(null, item * 2);
|
|
}
|
|
```
|
|
|
|
More examples could be found in [test/test-serial-object.js](test/test-serial-object.js).
|
|
|
|
_Note: Since _object_ is an _unordered_ collection of properties,
|
|
it may produce unexpected results with sequential iterations.
|
|
Whenever order of the jobs' execution is important please use `serialOrdered` method._
|
|
|
|
### Ordered Serial Iterations
|
|
|
|
TBD
|
|
|
|
For example [compare-property](compare-property) package.
|
|
|
|
### Streaming interface
|
|
|
|
TBD
|
|
|
|
## Want to Know More?
|
|
|
|
More examples can be found in [test folder](test/).
|
|
|
|
Or open an [issue](https://github.com/alexindigo/asynckit/issues) with questions and/or suggestions.
|
|
|
|
## License
|
|
|
|
AsyncKit is licensed under the MIT license.
|