////////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  File:   PnpContract.sg - Contract between I/O System and Device.
//

using System;
using System.Collections;
using System.Runtime.Remoting;
using System.Runtime.InteropServices;
using System.Threading;
using Microsoft.SingSharp;
using Microsoft.Singularity;
using Microsoft.Singularity.Channels;
using Microsoft.Singularity.Io;

namespace Microsoft.Singularity.Io
{
    public contract PnpContract {
        in message Initialize();
        out message AckInitialize();
        out message NakInitialize();

        in message Connect(DeviceContract.Exp:Start! eDevice);
        out message AckConnect();
        out message NakConnect();

        in message Finalize();
        out message AckFinalize();
        out message NakFinalize();

        state Start: one {
            Initialize? -> DoInitialize;
        }

        state DoInitialize: one {
            AckInitialize! -> Initialized;
            NakInitialize! -> Start;
        }

        state Initialized: one {
            Connect? -> DoConnect;
            Finalize? -> DoFinalize;
        }

        state DoConnect: one {
            AckConnect! -> Initialized;
            NakConnect! -> Initialized;
        }

        state DoFinalize: one {
            AckFinalize! -> End;
            NakFinalize! -> Initialized;
        }

        state End: {
        }
    }
}