Pipeline class

A helper that makes it easy to compose a set of Middleware and a Handler.

Middleware are executed in the order they are added, processing the request top-down and the response bottom-up.

Basic Pipeline

var handler = const Pipeline()
    .addMiddleware(loggingMiddleware)
    .addMiddleware(cachingMiddleware)
    .addHandler(application);

Execution Order

// Request flows down:
// 1. Logging middleware (request)
// 2. Auth middleware (request)
// 3. Handler
// 4. Auth middleware (response)
// 5. Logging middleware (response)

final handler = const Pipeline()
    .addMiddleware(loggingMiddleware)    // First to see request
    .addMiddleware(authMiddleware)       // Second to see request
    .addHandler(apiHandler);             // Last to process

Note: this package also provides addMiddleware and addHandler extensions members on Middleware, which may be easier to use.

Constructors

Pipeline()

Creates a new, empty pipeline.

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

middleware → Middleware

Exposes this pipeline of Middleware as a single middleware instance.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

addHandler(Handler handler) → Handler

Returns a new Handler with handler as the final processor of a Request if all of the middleware in the pipeline have passed the request through.

addMiddleware(Middleware middleware) → Pipeline

Returns a new Pipeline with middleware added to the existing set of Middleware.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited