private void AddRequestToHistory(IImageLoaderTask task)
{
AddRequestToHistory(task.Parameters.Path, task.GetKey());
AddRequestToHistory(task.Parameters.CustomCacheKey, task.GetKey());
AddRequestToHistory(task.Parameters.LoadingPlaceholderPath, task.GetKey(task.Parameters.LoadingPlaceholderPath));
AddRequestToHistory(task.Parameters.ErrorPlaceholderPath, task.GetKey(task.Parameters.ErrorPlaceholderPath));
}
private PendingTask GetPendingTaskIfValid(IImageLoaderTask task, bool rawKey)
{
ConcurrentDictionary <string, PendingTask> tasks;
string key;
if (rawKey)
{
tasks = _pendingTasksByRawKey;
key = task.GetKey(raw: true);
}
else
{
tasks = _pendingTasks;
key = task.GetKey();
}
PendingTask alreadyRunningTaskForSameKey;
if (tasks.TryGetValue(key, out alreadyRunningTaskForSameKey) && !alreadyRunningTaskForSameKey.ImageLoadingTask.IsCancelled)
{
return(alreadyRunningTaskForSameKey);
}
return(null);
}
private void QueueAndGenerateImage(IImageLoaderTask task)
{
_logger.Debug(string.Format("Generating/retrieving image: {0}", task.GetKey()));
var currentPendingTask = new PendingTask()
{
ImageLoadingTask = task
};
PendingTask alreadyRunningTaskForSameKey = null;
lock (_pauseWorkLock)
{
lock (_pendingTasksLock)
{
alreadyRunningTaskForSameKey = _pendingTasks.FirstOrDefault(t => t.ImageLoadingTask.GetKey() == task.GetKey() && (!t.ImageLoadingTask.IsCancelled));
if (alreadyRunningTaskForSameKey == null)
{
_pendingTasks.Add(currentPendingTask);
}
}
}
if (alreadyRunningTaskForSameKey == null || !currentPendingTask.ImageLoadingTask.CanUseMemoryCache())
{
Run(currentPendingTask);
}
else
{
WaitForSimilarTask(currentPendingTask, alreadyRunningTaskForSameKey);
}
}
private void QueueAndGenerateImage(IImageLoaderTask task)
{
_logger.Debug(string.Format("Generating/retrieving image: {0}", task.GetKey()));
int position = Interlocked.Increment(ref _currentPosition);
var currentPendingTask = new PendingTask()
{
Position = position, ImageLoadingTask = task, FrameworkWrappingTask = CreateFrameworkTask(task)
};
PendingTask alreadyRunningTaskForSameKey = null;
lock (_pendingTasksLock)
{
alreadyRunningTaskForSameKey = FindSimilarPendingTask(task);
if (alreadyRunningTaskForSameKey == null)
{
Interlocked.Increment(ref _statsTotalPending);
_pendingTasks.Add(currentPendingTask);
}
else
{
alreadyRunningTaskForSameKey.Position = position;
}
}
if (alreadyRunningTaskForSameKey == null || !currentPendingTask.ImageLoadingTask.CanUseMemoryCache())
{
Run(currentPendingTask);
}
else
{
WaitForSimilarTask(currentPendingTask, alreadyRunningTaskForSameKey);
}
}
private PendingTask FindSimilarPendingTask(IImageLoaderTask task)
{
// At first check if the exact same items exists in pending tasks (exact same means same transformations, same downsample, ...)
// Since it will be exactly the same it can be retrieved from memory cache
string key = task.GetKey(raw: false);
var alreadyRunningTaskForSameKey = _pendingTasks.FirstOrDefault(t => t.ImageLoadingTask.GetKey(raw: false) == key);
return(alreadyRunningTaskForSameKey);
}
private void QueueAndGenerateImage(IImageLoaderTask task)
{
_logger.Debug(string.Format("Generating/retrieving image: {0}", task.GetKey()));
int position = Interlocked.Increment(ref _currentPosition);
var currentPendingTask = new PendingTask()
{
Position = position, ImageLoadingTask = task
};
var alreadyRunningTaskForSameKey = FindSimilarPendingTask(task);
if (alreadyRunningTaskForSameKey == null)
{
if (!AddTaskToPendingTasks(currentPendingTask))
{
return;
}
}
else
{
alreadyRunningTaskForSameKey.Position = position;
}
if (alreadyRunningTaskForSameKey == null || !currentPendingTask.ImageLoadingTask.CanUseMemoryCache())
{
Run(currentPendingTask);
}
else
{
WaitForSimilarTask(currentPendingTask, alreadyRunningTaskForSameKey);
}
}
public void RemovePendingTask(IImageLoaderTask task)
{
var key = task.GetKey();
PendingTask existingTask;
_pendingTasks.TryRemove(key, out existingTask);
}
private void QueueAndGenerateImage(IImageLoaderTask task)
{
_logger.Debug(string.Format("Generating/retrieving image: {0}", task.GetKey()));
var currentPendingTask = new PendingTask() { ImageLoadingTask = task };
PendingTask alreadyRunningTaskForSameKey = null;
lock (_pauseWorkLock)
{
lock (_pendingTasksLock)
{
alreadyRunningTaskForSameKey = _pendingTasks.FirstOrDefault(t => t.ImageLoadingTask.GetKey() == task.GetKey() && (!t.ImageLoadingTask.IsCancelled));
if (alreadyRunningTaskForSameKey == null)
_pendingTasks.Add(currentPendingTask);
}
}
if (alreadyRunningTaskForSameKey == null || !currentPendingTask.ImageLoadingTask.CanUseMemoryCache())
{
Run(currentPendingTask);
}
else
{
WaitForSimilarTask(currentPendingTask, alreadyRunningTaskForSameKey);
}
}
private static void AddRequestToHistory(IImageLoaderTask task)
{
AddRequestToHistory(task.Parameters.Path, task.GetKey());
AddRequestToHistory(task.Parameters.CustomCacheKey, task.GetKey());
AddRequestToHistory(task.Parameters.LoadingPlaceholderPath, task.GetKey(task.Parameters.LoadingPlaceholderPath));
AddRequestToHistory(task.Parameters.ErrorPlaceholderPath, task.GetKey(task.Parameters.ErrorPlaceholderPath));
}
private void QueueAndGenerateImage(IImageLoaderTask task)
{
_logger.Debug(string.Format("Generating/retrieving image: {0}", task.GetKey()));
int position = Interlocked.Increment(ref _currentPosition);
var currentPendingTask = new PendingTask() { Position = position, ImageLoadingTask = task, FrameworkWrappingTask = CreateFrameworkTask(task) };
PendingTask alreadyRunningTaskForSameKey = null;
lock (_pendingTasksLock)
{
alreadyRunningTaskForSameKey = FindSimilarPendingTask(task);
if (alreadyRunningTaskForSameKey == null)
{
Interlocked.Increment(ref _statsTotalPending);
_pendingTasks.Add(currentPendingTask);
}
else
{
alreadyRunningTaskForSameKey.Position = position;
}
}
if (alreadyRunningTaskForSameKey == null || !currentPendingTask.ImageLoadingTask.CanUseMemoryCache())
{
Run(currentPendingTask);
}
else
{
WaitForSimilarTask(currentPendingTask, alreadyRunningTaskForSameKey);
}
}
private PendingTask FindSimilarPendingTask(IImageLoaderTask task)
{
// At first check if the exact same items exists in pending tasks (exact same means same transformations, same downsample, ...)
// Since it will be exactly the same it can be retrieved from memory cache
string key = task.GetKey(raw: false);
var alreadyRunningTaskForSameKey = _pendingTasks.FirstOrDefault(t => t.ImageLoadingTask.GetKey(raw: false) == key);
return alreadyRunningTaskForSameKey;
}