blob: bafaa25a5961bd8963617b671e26cb859b16bad1 [file] [log] [blame]
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'incoming.dart';
import 'internal/_startup_context_impl.dart';
import 'outgoing.dart';
/// Context information that this component received at startup.
/// The [StartupContext] holds references to the services and connections that
/// the component was launched with. Authors can use the startup context to
/// access useful information for connecting to other components and interacting
/// with the framework.
abstract class StartupContext {
static StartupContext _startupContext;
/// Services that are available to this component.
/// These services have been offered to this component by its parent or are
/// ambiently offered by the Component Framework.
final Incoming incoming;
/// Services and data exposed to other components.
/// Use [outgoing] to publish services and data to the component manager and
/// other components.
final Outgoing outgoing;
/// Creates a startup context from the process startup info.
/// Returns a cached [StartupContext] instance associated with the currently
/// running component if one was already created.
/// Authors should use this method of obtaining the [StartupContext] instead
/// of instantiating one on their own as it will bind and connect to all the
/// underlying services for them.
factory StartupContext.fromStartupInfo() {
return _startupContext ??= StartupContextImpl.fromStartupInfo();