// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library fuchsia.session;

using fuchsia.url;

/// A protocol used to launch sessions.
[Discoverable]
protocol Launcher {
    /// Launches the session detailed in `configuration`.
    ///
    /// If a session is currently running, the component associated with the running session will
    /// be destroyed.
    LaunchSession(SessionConfiguration configuration) -> () error LaunchSessionError;

    /// Restarts the current session.
    ///
    /// An error is returned if there is no current session or the session failed to restart.
    RestartSession() -> () error LaunchSessionError;
};

/// Errors returned when a session fails to launch or restart.
enum LaunchSessionError {
    /// There was an error resolving the session's component url.
    NOT_FOUND = 1;

    /// The session failed to launch.
    FAILED = 2;
};

/// Describes a session to launch.
table SessionConfiguration {
    /// The component URL of the session.
    1: string:fuchsia.url.MAX_URL_LENGTH session_url;
};