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

using Microsoft.Singularity.Directory;
using Microsoft.Singularity.Channels;

namespace Microsoft.Singularity.Io
{
    public contract VolumeManagerContract: ServiceContract
    {
        in     message RegisterDisk(char[]! in ExHeap name);
        out    message AckRegisterDisk();
        out    message NakRegisterDisk();

        in     message DeregisterDisk(char[]! in ExHeap name);
        out    message AckDeregisterDisk();
        out    message NakDeregisterDisk();

        out    message Connect(DiskDeviceContract.Exp:Start! exp, byte systemId, ulong startSector, ulong sectorCount);
        in     message AckConnect();
        in     message NakConnect(DiskDeviceContract.Exp:Start exp);

        out message Success();

        override state Start: one {
            Success! -> Ready;
        }

        state Ready: one
        {
            RegisterDisk? -> RegisterAck;
        }

        state RegisterAck: one
        {
            AckRegisterDisk! -> Accept;
            NakRegisterDisk! ;
        }
        state Accept: one
        {
            Connect! -> ( AckConnect? or NakConnect?) -> Accept;
        }
    }
}