protected void TakeNext(IProcessNotify processNotify, string localFolder)
{
index++;
var metaData = GetMetaData(index);
DoDownload(metaData, processNotify, localFolder);
}
public static void DownloadFiles(IEnumerable <string> urls, IProcessNotify processNotify = null, long batchId = 0)
{
var metaDatas = urls.Select(u => new MetaData
{
Url = u
}).ToArray();
DownloadFiles(metaDatas, batchId, processNotify, Config.ReplaceExist);
}
public static void DownloadFile(string url, string localName, long batchId, IProcessNotify processNotify = null, bool existReplace = false)
{
var metaData = new MetaData
{
BatchId = batchId,
Url = url,
LocalFileName = localName
};
DownloadFile(metaData, processNotify, existReplace);
}
public static void DownloadFile(MetaData metaData, IProcessNotify processNotify = null, bool existReplace = false)
{
if (string.IsNullOrEmpty(metaData.LocalFileName))
{
metaData.LocalFileName = Config.GetDefaultFile(metaData.Url);
}
metaData.ProcessNotify = processNotify;
metaData.ReplaceExist = existReplace;
datas.Add(metaData);
autoResetEvent.Set();
}
private void DoDownload(MetaData metaData, IProcessNotify processNotify, string localFolder)
{
var fullPath = Path.Combine(localFolder, metaData.LocalFileName);
metaData.FullPath = fullPath;
var isExist = CheckIfExist(fullPath, metaData);
if (isExist)
{
TryGoToNext(metaData, processNotify, localFolder);
return;
}
DoWebDown(metaData, processNotify, localFolder, fullPath);
}
private void TryGoToNext(MetaData metaData, IProcessNotify processNotify, string localFolder)
{
var isFinshed = StepOver(index, metaData);
if (isFinshed)
{
FinshedNotify(processNotify);
Finshed?.Invoke(this);
return;
}
else
{
TakeNext(processNotify, localFolder);
return;
}
}
private void EndResponse(WebResponse response, MetaData metaData, IProcessNotify processNotify, string loaclPath, string fullPath)
{
var stream = response.GetResponseStream();
var fs = new FileStream(fullPath, FileMode.Create, FileAccess.Write);
var totalLength = response.ContentLength;
byte[] bytes = new byte[1024 * 512];
var accpectLegnth = 0;
Action beginReadAction = null;
Action <IAsyncResult> endReadAction = (ar) =>
{
var readCount = stream.EndRead(ar);
if (readCount == 0)
{
stream.Dispose();
fs.Flush();
fs.Dispose();
response.Close();
TryGoToNext(metaData, processNotify, loaclPath);
}
else
{
accpectLegnth += readCount;
processNotify?.Progress(metaData, accpectLegnth, totalLength, (int)(accpectLegnth / totalLength));
fs.Write(bytes, 0, readCount);
fs.Flush();
beginReadAction.Invoke();
}
};
beginReadAction = () =>
{
stream.BeginRead(bytes, 0, bytes.Length, (ar) => {
endReadAction.Invoke(ar);
}, null);
};
beginReadAction.Invoke();
}
private void DoWebDown(MetaData metaData, IProcessNotify processNotify, string loaclPath, string fullPath)
{
HttpWebRequest request = null;
try {
request = (HttpWebRequest)WebRequest.Create(metaData.Url);
}
catch (Exception ex)
{
try
{
processNotify?.Error(ex, metaData);
return;
}
finally
{
Finshed?.Invoke(this);
}
}
request.BeginGetResponse(ar => {
try
{
var response = request.EndGetResponse(ar);
EndResponse(response, metaData, processNotify, loaclPath, fullPath);
}
catch (Exception ex)
{
try
{
processNotify?.Error(ex, metaData);
}
finally
{
Finshed?.Invoke(this);
}
}
}, null);
}
protected override void FinshedNotify(IProcessNotify processNotify)
{
processNotify?.BatchSucceed(batchId, datas);
}
protected override void FinshedNotify(IProcessNotify processNotify)
{
processNotify?.Succeed(metaData);
}
internal void StartDown(IProcessNotify processNotify, string localFolder)
{
var metaData = GetMetaData(index);
DoDownload(metaData, processNotify, localFolder);
}
protected abstract void FinshedNotify(IProcessNotify processNotify);
public static void DownloadFiles(IEnumerable <MetaData> metaDatas, long batchId = 0, IProcessNotify processNotify = null, bool existReplace = false)
{
foreach (var metaData in metaDatas)
{
if (string.IsNullOrEmpty(metaData.LocalFileName))
{
metaData.LocalFileName = Config.GetDefaultFile(metaData.Url);
}
metaData.BatchId = batchId;
metaData.ProcessNotify = processNotify;
metaData.ReplaceExist = existReplace;
datas.Add(metaData);
}
autoResetEvent.Set();
}
public static void DownloadFile(string url, long id, IProcessNotify processNotify)
{
DownloadFile(url, string.Empty, id, processNotify, Config.ReplaceExist);
}
