Synnefo » Pithos MS Client

#region

/* -----------------------------------------------------------------------

 * <copyright file="PithosWorkflow.cs" company="GRNet">

 * 

 * Copyright 2011-2012 GRNET S.A. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

 * conditions are met:

 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. Redistributions in binary form must reproduce the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer in the documentation and/or other materials

 *      provided with the distribution.

 *

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * The views and conclusions contained in the software and

 * documentation are those of the authors and should not be

 * interpreted as representing official policies, either expressed

 * or implied, of GRNET S.A.

 * </copyright>

 * -----------------------------------------------------------------------

 */

#endregion

using System;

using System.Collections.Generic;

using System.ComponentModel.Composition;

using System.Linq;

using System.Runtime.InteropServices;

using System.Text;

using System.Threading;

using System.Threading.Tasks;

using Pithos.Interfaces;

using System.IO;

using System.Diagnostics;

using Pithos.Network;

namespace Pithos.Core

{

    [Export(typeof(IPithosWorkflow))]

    public class PithosWorkflow:IPithosWorkflow

    {

        [Import]

        public IPithosSettings Settings { get; set; }

        [Import]

        public IStatusKeeper StatusKeeper { get; set; }

        public FileStatus SetFileStatus(string path, FileStatus status)

        {

            Debug.Assert(!path.Contains(FolderConstants.CacheFolder));

            Debug.Assert(!path.EndsWith(".ignore",StringComparison.InvariantCultureIgnoreCase));

            if (String.IsNullOrWhiteSpace(path))

                throw new ArgumentNullException("path", "The path parameter must not be emtpy");

            var oldStatus=StatusKeeper.GetFileStatus(path);

            if (oldStatus == status)

                return oldStatus;

            switch(oldStatus)

            {

                case FileStatus.Unchanged :

                    break;

                case FileStatus.Created:

                    if (status == FileStatus.Modified)

                        return oldStatus;

                    break;

                case FileStatus.Modified:

                case FileStatus.Renamed:

                    if (status == FileStatus.Created)

                        return oldStatus;

                    break;

            }

            StatusKeeper.SetFileStatus(path, status);

            return status;

        }

        public void ClearFileStatus(string path)

        {

            if (String.IsNullOrWhiteSpace(path))

                throw new ArgumentNullException("path", "The path parameter must not be emtpy");

            StatusKeeper.ClearFileStatus(path.ToLower());

        }

        public Task<FileStream> OpenStreamWithWaiting(string path)

        {

            if (String.IsNullOrWhiteSpace(path))

                throw new ArgumentNullException("path","The path parameter must not be emtpy");

            if (!File.Exists(path))

                throw new FileNotFoundException("The specified file or path does not exist", path);

            return new Task<FileStream>(() =>

                    {

                        int counter = 0;

                        while (true)

                        {

                            try

                            {

                                var stream=File.OpenRead(path);

                                return stream;                                

                            }

                            catch 

                            {

                                Thread.Sleep(500);

                                if (++counter > 10)

                                    throw;

                            }

                        }

                    });

        }

    }

}