# [−]Module actix_web::actix::actix::dev

The `actix` prelude for library developers

The purpose of this module is to alleviate imports of many common actix traits by adding a glob import to the top of actix heavy modules:

    use actix::dev::*;

## Modules

actors | Helper actors
channel |
io |
msgs | Actix system messages

## Structs

ActorResponse | Helper type for representing different type of message responses
Arbiter | Event loop controller
Context | Actor execution context
ContextFut |
ContextParts |
Envelope |
Mailbox |
MessageResult | Helper type that implements `MessageResponse` trait
Recipient | `Recipient` type allows to send one specific message to an actor.
RecipientRequest | `RecipientRequest` is a `Future` which represents asynchronous message sending process.
Registry | Actors registry
Request | `Request` is a `Future` which represents asynchronous message sending process.
Response | Helper type for representing different type of message responses
SpawnHandle | Spawned future handle. Could be used for cancelling spawned future.
System | System is an actor which manages runtime.
SystemRegistry | System wide actors registry
TimerFunc | An `ActorFuture` that runs a function in the actor's context after a specified amount of time.

## Enums

MailboxError | Set of error that can occurred during message delivery process
Running |
SendError |

## Traits

Actor | Actors are objects which encapsulate state and behavior.
ActorContext | Actor execution context
ArbiterService | Trait defines arbiter's service.
AsyncContextParts |
EnvelopeProxy |
Message | Message type
MessageResponse | Trait which defines message response
ResponseChannel | Trait defines message response channel
StreamHandler | Stream handler
SystemService | Trait defines system's service.
ToEnvelope | Converter trait, packs message to suitable envelope

## Type Definitions

ResponseActFuture | A specialized actor future for async message handler

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