# 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
fut | Custom `Future` implementation with `Actix` support
msgs | Actix system messages

## Structs

ActorResponse | Helper type for representing different type of message responses
Arbiter | Event loop controller
ContextFut |
ContextParts |
Envelope |
Mailbox |
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.
SyncContext | Sync actor execution context
System | System is an actor which manages runtime.
SystemRegistry | System wide actors registry

## Traits

ActorContext | Actor execution context
ActorFuture | Trait for types which are a placeholder of a value that may become available at some later point in time.
ActorStream | A stream of values, not all of which may have been produced yet.
ArbiterService | Trait defines arbiter's service.
AsyncContext | Asynchronous execution context
AsyncContextParts |
Handler | Message handler
Message | Message type
MessageResponse | Trait which defines message response
ResponseChannel | Trait defines message response channel
StreamHandler | Stream handler
ToEnvelope | Converter trait, packs message to suitable envelope
WrapStream | Helper trait that allows conversion of normal stream into `ActorStream`

## Type Definitions

ResponseFuture | A specialized future for async message handler

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