// ----------------------------------------------------------------------------
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ----------------------------------------------------------------------------

using System;
using System.Collections;
using Microsoft.SingSharp;
using Microsoft.Singularity;
using Microsoft.Singularity.Directory;
using Microsoft.Singularity.Channels;

namespace Microsoft.Singularity.FileSystem
{

    /// <summary>
    /// This contract is exported by services that are filesystem controllers.
    /// </summary>
	public contract FileSystemControllerContract : ServiceContract
	{		
		in message Mount(char[]! in ExHeap device, char[]! in ExHeap mountPath);
		out message AckMount();
		out message NakMount();
		
		in message Unmount(char[]! in ExHeap mountPath);
		out message AckUnmount();
		out message NakUnmount();

        out message Ok();
        out message RequestFailed(ErrorCode error);
		
		out message Success();
		
		override state Start : one {
			Success! -> Ready;
		}
		
		state Ready : one {
		    Mount? -> Mounting;
		    Unmount? -> Unmounting;
		}
		
		state Mounting : one {
		    Ok! -> Ready;
		    RequestFailed! -> Ready;
		}
		
		state Unmounting : one {
		    Ok! -> Ready;
		    RequestFailed! -> Ready;
		}
	}
}