EmbeddedMessageEnvelope.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
// 
//        http://www.apache.org/licenses/LICENSE-2.0
// 
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
//

using System;
using System.Collections.Generic;

namespace Deveel.Data.Protocol {
    public sealed class EmbeddedMessageEnvelope : IServerMessageEnvelope {
        private static int dispatchCounter = -1;

        private EmbeddedMessageEnvelope(IDictionary<string, object> metadata, IMessage message) {
            Message = message;
            Metadata = metadata;

            object dispatchId;
            if (!metadata.TryGetValue("DispatchID", out dispatchId))
                throw new ArgumentException("Metadata must specify a Dispatch ID");

            DispatchId = (int) dispatchId;
        }

        public IDictionary<string, object> Metadata { get; private set; }

        public int DispatchId { get; private set; }

        public IMessage Message { get; private set; }

        public ServerError Error { get; private set; }

        public void SetError(Exception error) {
            // TODO: in another version there will be support for Class and Code of error
            Error = new ServerError(-1, -1, error.Message);
        }

        public static EmbeddedMessageEnvelope Create(int dispatchId, IMessage message) {
            var metadata = new Dictionary<string, object>();
            metadata["DispatchID"] = dispatchId;
            return new EmbeddedMessageEnvelope(metadata, message);
        }

        public static EmbeddedMessageEnvelope Create(IDictionary<string, object> metadata, IMessage message) {
            if (metadata == null)
                metadata = new Dictionary<string, object>();

            object dispatchId;
            if (!metadata.TryGetValue("DispatchID", out dispatchId))
                dispatchId = dispatchCounter++;

            metadata["DispatchID"] = dispatchId;
            return new EmbeddedMessageEnvelope(metadata, message);
        }
    }
}