///////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  File:   ChannelContract.sg
//  Note:   Contract definition for the Singularity Channel diagnostics service
//

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

namespace Microsoft.Singularity.Diagnostics.Contracts
{
    public rep struct ChannelInfo {
        public int ChannelId;
        public int ImpProcessId;
        public int ExpProcessId;
        public int MessagesDeliveredToImp;
        public int MessagesDeliveredToExp;
    }

    public contract ChannelContract : ServiceContract
    {
        public const string ModuleName = "/channel-diagnostics";

        // Signal our identity
        out message Ready();

        in message GetChannels();
        out message Channels(ChannelInfo[]! in ExHeap channels);

        in message GetChannelStats();
        out message ChannelStats(long msgsSent, long bytesSent, long channelsCreated);

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

        state ReadyState : one
        {
            GetChannels? -> Channels! -> ReadyState;
            GetChannelStats? -> ChannelStats! -> ReadyState;
        }
    }
}