private void AssertThread(ImageCacheInfo cacheInfo, int taskId)
{
if (cacheInfo.GetCurrentTaskId() != taskId)
{
throw new TaskCanceledException();
}
}
/// <summary>キャッシュ情報を更新する</summary>
/// <param name="userInfo">ユーザ情報</param>
/// <param name="cacheInfo">キャッシュ情報</param>
/// <returns>キャッシュ情報</returns>
private ImageCacheInfo UpdateCache(IUserInfo userInfo, ImageCacheInfo cacheInfo)
{
if (cacheInfo.FileName != Path.GetFileName(userInfo.ProfileImageUrl))
{
this.SetImage(cacheInfo, userInfo);
}
return(cacheInfo);
}
/// <summary>キャッシュ情報を生成する</summary>
/// <param name="userInfo">ユーザ情報</param>
/// <returns>キャッシュ情報</returns>
private ImageCacheInfo CreateCache(IUserInfo userInfo)
{
var cache = new ImageCacheInfo
{
FileName = Path.GetFileName(userInfo.ProfileImageUrl),
};
this.SetImage(cache, userInfo);
return(cache);
}
/// <summary>キャッシュ情報に画像データを格納する</summary>
/// <param name="cacheInfo"></param>
/// <param name="userInfo"></param>
private void SetImage(ImageCacheInfo cacheInfo, IUserInfo userInfo)
{
int taskId = cacheInfo.CreateTaskId();
Task.Run(() => this.LoadImage(cacheInfo, userInfo))
.ContinueWith(
task => cacheInfo.Image = task.Result,
CancellationToken.None,
TaskContinuationOptions.OnlyOnRanToCompletion,
TaskScheduler.FromCurrentSynchronizationContext());
}
/// <summary>キャッシュ情報から画像データを取得する</summary>
/// <param name="cacheInfo">キャッシュ情報</param>
/// <param name="userInfo">ユーザ情報</param>
/// <returns>画像データ</returns>
private BitmapImage LoadImage(ImageCacheInfo cacheInfo, IUserInfo userInfo)
{
int taskId = cacheInfo.GetCurrentTaskId();
this.AssertThread(cacheInfo, taskId);
var imageUrl = userInfo.ProfileImageUrl;
if (string.IsNullOrEmpty(imageUrl))
{
return(null);
}
var imageFileName = Path.GetFileName(imageUrl);
var @params = CreateParameter(userInfo);
this.AssertThread(cacheInfo, taskId);
if (this.TryFindCache(@params, imageFileName, out var imageData))
{
this.AssertThread(cacheInfo, taskId);
return(ImageUtil.CreateBitmapImage(new MemoryStream(imageData)));
}
this.AssertThread(cacheInfo, taskId);
if (this.TryDownloadImage(userInfo, out var imageStream))
{
this.AssertThread(cacheInfo, taskId);
//@params.Add("filename", imageFileName);
//@params.Add("image_data", imageStream.ToArray());
//this.WriteCache(@params);
this.AssertThread(cacheInfo, taskId);
return(ImageUtil.CreateBitmapImage(imageStream));
}
this.AssertThread(cacheInfo, taskId);
return(null);
}
/// <summary>弱参照中のキャッシュ情報を更新する</summary>
/// <param name="userInfo"></param>
/// <param name="reference"></param>
/// <returns></returns>
private ImageCacheInfo UpdateCacheReference(IUserInfo userInfo, ImageCacheInfo reference)
{
this.UpdateCache(userInfo, reference);
return(reference);
}