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add notes on sync primitives

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This commit is contained in:
Nikolay Kim
2017-12-26 11:19:08 -08:00
parent 030a70841a
commit 5e17a846af
2 changed files with 11 additions and 5 deletions
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11
guide/src/qs_4.md
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@@ -1,7 +1,7 @@
# Handler
A request handler can by any object that implements
[`Handler` trait](../actix_web/dev/trait.Handler.html#implementors).
A request handler can by any object that implements
[*Handler trait*](../actix_web/dev/trait.Handler.html).
Request handling happen in two stages. First handler object get called.
Handle can return any object that implements
[*Responder trait*](../actix_web/trait.Responder.html#foreign-impls).
@@ -11,7 +11,7 @@ result of the `respond_to()` call get converted to `Reply` object.
By default actix provides `Responder` implementations for some standard types,
like `&'static str`, `String`, etc.
For complete list of implementations check
[Responder documentation](../actix_web/trait.Responder.html#foreign-impls).
[*Responder documentation*](../actix_web/trait.Responder.html#foreign-impls).
Examples of valid handlers:
@@ -115,6 +115,11 @@ fn main() {
}
```
Be careful with synchronization primitives like *Mutex* or *RwLock*. Actix web framework
handles request asynchronously, by blocking thread execution all concurrent
request handling processes would block. If you need to share or update some state
from multiple threads consider using [actix](https://actix.github.io/actix/actix/) actor system.
## Response with custom type
To return custom type directly from handler function type needs to implement `Responder` trait.