Overview

• module Fantail

  Provides worker-aware HTTP load balancing with a global admission queue.

  • class Backend

    Represents a live backend client and its admission state.
  • module Balance

    Built-in backend selection policies.

    • class Spread

      Prefer the backend with the fewest active requests.
    • class Pack

      Prefer a backend which is already processing the same class of work.
  • class Configuration

    Immutable request queue and admission configuration.

    • class Builder

      Builds configurations using the application DSL.
  • class Control < Async::Bus::Server

    Exposes a registry over async-bus for endpoint publication.
  • class Endpoint

    Represents a named HTTP backend endpoint.
  • class Monitor < Async::Bus::Client

    Publishes a desired endpoint set and subsequent deltas to a Fantail registry.
  • class Proxy

    Routes HTTP requests through the configured admission queues.
  • class Queue

    Immutable policy for one class of requests.

    • class Builder

      Builds a queue policy using the configuration DSL.
  • class Registry < Async::Bus::Controller

    Maintains live backends and notifies the scheduler when capacity changes.
  • class ResponseBody < Protocol::HTTP::Body::Wrapper

    Wraps an upstream response body and releases its backend exchange when closed.
  • class Scheduler

    Matches pending requests to concrete backend permits.

    • class Reservation

      A reserved processing permit and response exchange.
    • class Rejection

      A queue admission rejection.
  • class Server

    Runs the HTTP load balancer and endpoint-control server together.