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ConcurrentCollectionOperations

★ 94 Open GitHub ↗

Map & filter using GCD for NSArray, NSDictionary, NSSet, etc.

// repository documentation

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## Concurrent Collection Operations

A set of categories for performing concurrent map and filter operations on
Foundation data structures. `NSArray`, `NSDictionary`, `NSSet`, `NSOrderedSet`,
and `NSMapTable` (OS X) are currently supported.

Concurrency is achieved using Grand Central Dispatch's `dispatch_apply`. By
default, operations are run on the default priority global concurrent queue
(`DISPATCH_QUEUE_PRIORITY_DEFAULT`). The operations can be performed on any
concurrent queue, see the category header files.

Please note that using this code could actually result in slower performance.
For example, if a map or filter operation uses up a large amount of memory,
then performing it concurrently could cause memory thrashing. Currently, this
API does not offer a way to limit the amount of concurrency, but doing so
explicitly with `dispatch_semaphore` is straight forward.

This library is based off code and ideas from [@alloy](https://github.com/alloy)
and [@seanlilmateus](https://github.com/seanlilmateus).

### Installation

Install via [CocoaPods](http://cocoapods.org/), or by adding the Xcode project
to your project.

### Examples

These examples are taken from the [tests](https://github.com/kastiglione/ConcurrentCollectionOperations/blob/master/ConcurrentCollectionOperationsTests/ConcurrentCollectionOperationsTests.m).

Doubling the values of an array:

```objc
NSArray *doubled = [numbersArray cco_concurrentMap:^(NSNumber *number) {
    return @(2 * number.unsignedIntegerValue);
}];
```

Filtering even numbers out of a dictionary:

```objc
NSDictionary *filtered = [numbersDictionary cco_concurrentFilter:^BOOL (NSNumber *number) {
    return number.unsignedIntegerValue % 2 == 1;
}];
```

### Contributors

ConcurrentCollectionOperations has been made by [@alloy](https://github.com/alloy),
[@CodaFi](https://github.com/CodaFi), [@jballanc](https://github.com/jballanc),
[@kastiglione](https://github.com/kastiglione), and
[@seanlilmateus](https://github.com/seanlilmateus).

### TODO

1. Write heavier/stressing tests.

### License

Concurrent Collection Operations is released under the MIT License. See
[LICENSE.txt](https://github.com/kastiglione/ConcurrentCollectionOperations/blob/master/LICENSE.txt).

### Contributing

1. Fork it
1. Create your feature branch (git checkout -b my-new-feature)
1. Commit your changes (git commit -am 'Add some feature')
1. Push to the branch (git push origin my-new-feature)
1. Create new Pull Request

ConcurrentCollectionOperations

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