/*
 * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
 * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
 * 
 * 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.ComponentModel.Composition;
using QuantConnect.Packets;

namespace QuantConnect.Interfaces
{
    /// <summary>
    /// Task requestor interface with cloud system
    /// </summary>
    [InheritedExport(typeof(IJobQueueHandler))]
    public interface IJobQueueHandler
    {
        /// <summary>
        /// Initialize the internal state
        /// </summary>
        void Initialize();

        /// <summary>
        /// Request the next task to run through the engine:
        /// </summary>
        /// <returns>Algorithm job to process</returns>
        AlgorithmNodePacket NextJob(out string algorithmPath);

        /// <summary>
        /// Signal task complete
        /// </summary>
        /// <param name="job">Work to do.</param>
        void AcknowledgeJob(AlgorithmNodePacket job);
    }
}
