danog/amp
1
0
Fork 0
mirror of https://github.com/danog/amp.git synced 2024-11-30 04:29:08 +01:00
Code Issues Projects Releases Wiki Activity

Improve cancellation documentation to reflect the latest features

Browse Source
This commit is contained in:
Niklas Keller 2017-05-27 19:46:14 +02:00
parent a96d5c1d1b
commit 9c17f02172
1 changed files with 18 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
docs/cancellation/README.md
View File

@ -5,9 +5,24 @@ permalink: /cancellation/
---
Amp provides primitives to allow the cancellation of operations, namely `CancellationTokenSource` and `CancellationToken`.
Every operation that supports cancellation accepts an instance of `CancellationToken` as (optional) argument. The operation then subscribes with `CancellationToken::subscribe()` to any cancellation requests that might happen. If the operation consists of any sub-operations that support cancellation, it passes that same `CancellationToken` instance down to these sub-operations.
```php
$tokenSource = new CancellationTokenSource;
$promise = asyncRequest("...", $tokenSource->getToken());
Loop::delay(1000, function () use ($tokenSource) {
$tokenSource->cancel();
});
$result = yield $promise;
```
Every operation that supports cancellation accepts an instance of `CancellationToken` as (optional) argument. Within a coroutine, `$token->throwIfRequested()` can be used to fail the operation with a `CancelledException`. As `$token` is often an optional parameter and might be `null`, these calls need to be guared with a `if ($token)` or similar check. Instead of doing so, it's often easier to simply set the token to `$token = $token ?? new NullCancellationToken` at the beginning of the method.
While `throwIfRequested()` works well within coroutines, some operations might want to subscribe with a callback instead. They can do so using `CancellationToken::subscribe()` to subscribe any cancellation requests that might happen.
If the operation consists of any sub-operations that support cancellation, it passes that same `CancellationToken` instance down to these sub-operations.
The original caller creates a `CancellationToken` by creating an instance of `CancellationTokenSource` and passing `$cancellationTokenSource->getToken()` to the operation. Only the original caller has access to the `CancellationTokenSource` and can cancel the operation using `CancellationTokenSource::cancel()`.
The original caller creates a `CancellationToken` by creating an instance of `CancellationTokenSource` and passing `$cancellationTokenSource->getToken()` to the operation as shown in the above example. Only the original caller has access to the `CancellationTokenSource` and can cancel the operation using `CancellationTokenSource::cancel()`, similar to the way it works with `Deferred` and `Promise`.
{:.note}
> Cancellations are advisory only and have don't care semantics. A DNS resolver might ignore cancellation requests after the query has been sent as the response has to be processed anyway and can still be cached. An HTTP client might continue a nearly finished HTTP request to reuse the connection, but might abort a chunked encoding response as it cannot know the end.
> Cancellations are advisory only. A DNS resolver might ignore cancellation requests after the query has been sent as the response has to be processed anyway and can still be cached. An HTTP client might continue a nearly finished HTTP request to reuse the connection, but might abort a chunked encoding response as it cannot know whether continuing is actually cheaper than aborting.