ClientConnector.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;
using System.Runtime.Remoting;

using Deveel.Data.Routines;
using Deveel.Data.Sql.Triggers;

namespace Deveel.Data.Protocol {
    public abstract class ClientConnector : IClientConnector {
        public void Dispose() {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing) {

        }

        public ConnectorState CurrentState { get; private set; }

        public virtual ConnectionEndPoint LocalEndPoint { get; private set; }

        protected abstract ConnectionEndPoint MakeEndPoint(IDictionary<string, object> properties);

        ConnectionEndPoint IClientConnector.MakeEndPoint(IDictionary<string, object> properties) {
            return MakeEndPoint(properties);
        }

        IMessageProcessor IConnector.CreateProcessor() {
            return new ClientMessageProcessor(this);
        }

        IMessageEnvelope IConnector.CreateEnvelope(IDictionary<string, object> metadata, IMessage message) {
            return CreateEnvelope(metadata, message);
        }

        protected abstract IMessageEnvelope CreateEnvelope(IDictionary<string, object> metadata, IMessage message);

        ILargeObjectChannel IConnector.CreateObjectChannel(long objectId) {
            return CreateObjectChannel(objectId);
        }

        protected abstract ILargeObjectChannel CreateObjectChannel(long objectId);

        ITriggerChannel IConnector.CreateTriggerChannel(string triggerName, string objectName, TriggerEventType eventType) {
            return CreateTriggerChannel(triggerName, objectName, eventType);
        }

        protected abstract ITriggerChannel CreateTriggerChannel(string triggerName, string objectName, TriggerEventType eventType);

        protected abstract IMessageEnvelope SendEnvelope(IMessageEnvelope envelope);

        protected virtual IMessage OpenEnvelope(IMessageEnvelope envelope) {
            return envelope.Message;
        }

        protected virtual void OnMessageReceived(IMessage message) {
        }

        void IClientConnector.SetEncrypton(EncryptionData encryptionData) {
            OnSetEncryption(encryptionData);
        }

        protected virtual void OnSetEncryption(EncryptionData encryptionData) {
        }

        class ClientMessageProcessor : IMessageProcessor {
            private readonly ClientConnector connector;

            public ClientMessageProcessor(ClientConnector connector) {
                this.connector = connector;
            }

            public IMessageEnvelope ProcessMessage(IMessageEnvelope message) {
                var response = connector.SendEnvelope(message);
                if (response == null)
                    throw new InvalidOperationException("Unable to obtain a response from the server.");

                if (response.Error != null)
                    throw new ServerException(response.Error.ErrorMessage);

                var content = connector.OpenEnvelope(response);
                connector.OnMessageReceived(content);
                return response;
            }
        }
    }
}