// 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.app.agent;

using fuchsia.app;
using zx;

using TaskName = string:TASK_NAME_MAX_LENGTH;

/// Maximum length of an agent task name. See fuchsia.app.agent.TaskInfo.
const uint32 TASK_NAME_MAX_LENGTH = 100;

table TaskInfo {
    /// A client-provided task name that can be used later to refer to this task.
    1: TaskName name;

    /// The condition that would cause this task to get scheduled.
    2: ScheduleCondition schedule_condition;
};

/// Describes the condition that needs to be met for a task to become scheduled.
/// This is not yet complete and will be extended or changed.
xunion ScheduleCondition {
    /// Triggers when a new message arrives on the queue named by |message_queue_message|.
    fuchsia.app.MessageQueueName message_on_message_queue;

    /// Triggers when a the message queue named by |message_queue_deleted| is deleted.
    ///
    /// |queue_deleted| is the token for the message queue that is to be watched.
    /// This allows both message queue readers and writers to watch for queue
    /// deletions.
    fuchsia.app.MessageQueueName message_queue_deleted;

    /// Triggers the task approximately every time |repeating_timer| elapses.
    /// Once a task with |repeating_timer| is scheduled, it will trigger at
    /// approximately |now + repeating_timer|.
    zx.duration repeating_timer;
};