/// <summary>
/// Adds the file to cache and file saving queue if it does not exists.
/// </summary>
/// <param name="key">Key to store/retrieve the file.</param>
/// <param name="bytes">File data in bytes.</param>
/// <param name="duration">Specifies how long an item should remain in the cache.</param>
public virtual async Task AddToSavingQueueIfNotExistsAsync(string key, byte[] bytes, TimeSpan duration)
{
var sanitizedKey = key.ToSanitizedKey();
if (!_fileWritePendingTasks.TryAdd(sanitizedKey, 1))
return;
await _currentWriteLock.WaitAsync().ConfigureAwait(false); // Make sure we don't add multiple continuations to the same task
try
{
_currentWrite = _currentWrite.ContinueWith(async t =>
{
await Task.Yield(); // forces it to be scheduled for later
try
{
CacheEntry oldEntry;
if (_entries.TryGetValue(sanitizedKey, out oldEntry))
{
string oldFilepath = Path.Combine(_cachePath, oldEntry.FileName);
if (File.Exists(oldFilepath))
File.Delete(oldFilepath);
}
string filename = sanitizedKey + "." + (long)duration.TotalSeconds;
string filepath = Path.Combine(_cachePath, filename);
await FileStore.WriteBytesAsync(filepath, bytes, CancellationToken.None).ConfigureAwait(false);
_entries[sanitizedKey] = new CacheEntry(DateTime.UtcNow, duration, filename);
}
catch (Exception ex) // Since we don't observe the task (it's not awaited, we should catch all exceptions)
{
Logger.Error(string.Format("An error occured while caching to disk image '{0}'.", key), ex);
}
finally
{
byte finishedTask;
_fileWritePendingTasks.TryRemove(sanitizedKey, out finishedTask);
}
});
}
finally
{
_currentWriteLock.Release();
}
}
/// <summary>
/// Adds the file to cache and file saving queue if not exists.
/// </summary>
/// <param name="key">Key.</param>
/// <param name="bytes">Bytes.</param>
/// <param name="duration">Duration.</param>
public void AddToSavingQueueIfNotExists(string key, byte[] bytes, TimeSpan duration)
{
var sanitizedKey = SanitizeKey(key);
if (fileWritePendingTasks.TryAdd(sanitizedKey, 1))
{
#pragma warning disable 4014
Task.Run(async () =>
{
try
{
await fileWriteLock.WaitAsync().ConfigureAwait(false);
bool existed = entries.ContainsKey(sanitizedKey);
string filepath = Path.Combine(basePath, sanitizedKey);
if (!existed)
{
using (var fs = FileStore.GetOutputStream(filepath))
{
await fs.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
}
}
AppendToJournal(existed ? JournalOp.Modified : JournalOp.Created, sanitizedKey, DateTime.UtcNow, duration);
entries[sanitizedKey] = new CacheEntry(DateTime.UtcNow, duration);
}
catch (Exception ex) // Since we don't observe the task (it's not awaited, we should catch all exceptions)
{
Console.WriteLine(string.Format("An error occured while caching to disk image '{0}'.", key));
Console.WriteLine(ex.ToString());
}
finally
{
byte finishedTask;
fileWritePendingTasks.TryRemove(sanitizedKey, out finishedTask);
fileWriteLock.Release();
}
});
#pragma warning restore 4014
}
}
void InitializeWithJournal()
{
lock (lockJournal)
{
if(!File.Exists(journalPath))
{
using(var writer = new StreamWriter(journalPath, false, encoding))
{
writer.WriteLine(Magic);
writer.WriteLine(version);
}
return;
}
string line = null;
using(var reader = new StreamReader(journalPath, encoding))
{
if (!EnsureHeader(reader))
throw new InvalidOperationException("Invalid header");
while((line = reader.ReadLine()) != null)
{
try
{
var op = ParseOp(line);
string key;
DateTime origin;
TimeSpan duration;
switch (op)
{
case JournalOp.Created:
ParseEntry(line, out key, out origin, out duration);
entries.TryAdd(key, new CacheEntry(origin, duration));
break;
case JournalOp.Modified:
ParseEntry(line, out key, out origin, out duration);
entries[key] = new CacheEntry(origin, duration);
break;
case JournalOp.Deleted:
ParseEntry(line, out key);
CacheEntry oldEntry;
entries.TryRemove(key, out oldEntry);
break;
}
}
catch
{
}
}
}
}
}
public async Task AddOrUpdateAsync(string key, Stream stream, CancellationToken token, TimeSpan duration)
{
await isInitialized;
key = SanitizeKey(key);
bool existed = entries.ContainsKey(key);
try
{
await fileWriteLock.WaitAsync();
var file = await cacheFolder.CreateFileAsync(key, CreationCollisionOption.ReplaceExisting);
using (var fs = await file.OpenStreamForWriteAsync())
{
await stream.CopyToAsync(fs, BufferSize, token).ConfigureAwait(false);
}
}
finally
{
fileWriteLock.Release();
}
await AppendToJournal(existed ? JournalOp.Modified : JournalOp.Created,
key,
DateTime.UtcNow,
duration);
entries[key] = new CacheEntry(DateTime.UtcNow, duration);
}
/// <summary>
/// Adds the file to cache and file saving queue if not exists.
/// </summary>
/// <param name="key">Key.</param>
/// <param name="bytes">Bytes.</param>
/// <param name="duration">Duration.</param>
public async Task AddToSavingQueueIfNotExistsAsync(string key, byte[] bytes, TimeSpan duration)
{
await initTask.ConfigureAwait(false);
var sanitizedKey = SanitizeKey(key);
if (!fileWritePendingTasks.TryAdd(sanitizedKey, 1))
return;
await _currentWriteLock.WaitAsync().ConfigureAwait(false); // Make sure we don't add multiple continuations to the same task
try
{
_currentWrite = _currentWrite.ContinueWith(async t =>
{
await Task.Yield(); // forces it to be scheduled for later
await initTask.ConfigureAwait(false);
try
{
await fileWriteLock.WaitAsync().ConfigureAwait(false);
string filename = sanitizedKey + "." + duration.TotalSeconds;
var file = await cacheFolder.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);
using (var fs = await file.OpenStreamForWriteAsync().ConfigureAwait(false))
{
await fs.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
}
entries[sanitizedKey] = new CacheEntry(DateTime.UtcNow, duration, filename);
}
catch (Exception ex) // Since we don't observe the task (it's not awaited, we should catch all exceptions)
{
//TODO WinRT doesn't have Console
System.Diagnostics.Debug.WriteLine(string.Format("An error occured while caching to disk image '{0}'.", key));
System.Diagnostics.Debug.WriteLine(ex.ToString());
}
finally
{
byte finishedTask;
fileWritePendingTasks.TryRemove(sanitizedKey, out finishedTask);
fileWriteLock.Release();
}
});
}
finally
{
_currentWriteLock.Release();
}
}
/// <summary>
/// Adds the file to cache and file saving queue if not exists.
/// </summary>
/// <param name="key">Key.</param>
/// <param name="bytes">Bytes.</param>
/// <param name="duration">Duration.</param>
public async void AddToSavingQueueIfNotExists(string key, byte[] bytes, TimeSpan duration)
{
await initTask.ConfigureAwait(false);
var sanitizedKey = SanitizeKey(key);
if (fileWritePendingTasks.TryAdd(sanitizedKey, 1))
{
#pragma warning disable 4014
Task.Run(async () =>
{
await initTask.ConfigureAwait(false);
try
{
await fileWriteLock.WaitAsync().ConfigureAwait(false);
bool existed = entries.ContainsKey(sanitizedKey);
if (!existed)
{
var file = await cacheFolder.CreateFileAsync(key, CreationCollisionOption.ReplaceExisting);
using (var fs = await file.OpenStreamForWriteAsync().ConfigureAwait(false))
{
await fs.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
}
}
await AppendToJournalAsync(existed ? JournalOp.Modified : JournalOp.Created, sanitizedKey, DateTime.UtcNow, duration).ConfigureAwait(false);
entries[sanitizedKey] = new CacheEntry(DateTime.UtcNow, duration);
}
catch (Exception ex) // Since we don't observe the task (it's not awaited, we should catch all exceptions)
{
//TODO WinRT doesn't have Console
System.Diagnostics.Debug.WriteLine(string.Format("An error occured while caching to disk image '{0}'.", key));
System.Diagnostics.Debug.WriteLine(ex.ToString());
}
finally
{
byte finishedTask;
fileWritePendingTasks.TryRemove(sanitizedKey, out finishedTask);
fileWriteLock.Release();
}
});
#pragma warning restore 4014
}
}
async Task InitializeWithJournal()
{
await semaphoreSlim.WaitAsync();
try
{
try
{
journalFile = await cacheFolder.GetFileAsync(JournalFileName);
}
catch (Exception)
{
journalFile = null;
}
if (journalFile == null)
{
journalFile = await cacheFolder.CreateFileAsync(JournalFileName, CreationCollisionOption.ReplaceExisting);
//using (var stream = await journalFile.OpenStreamForWriteAsync())
//using (var writer = new StreamWriter(stream, encoding))
//{
// await writer.WriteLineAsync(Magic);
// await writer.WriteLineAsync(version);
// await writer.FlushAsync();
//}
return;
}
else
{
string line = null;
using (var stream = await journalFile.OpenStreamForReadAsync())
using (var reader = new StreamReader(stream, encoding))
{
/*
if (!EnsureHeader(reader))
{
throw new InvalidOperationException("Invalid header");
}
*/
while ((line = await reader.ReadLineAsync()) != null)
{
try
{
var op = ParseOp(line);
string key;
DateTime origin;
TimeSpan duration;
switch (op)
{
case JournalOp.Created:
ParseEntry(line, out key, out origin, out duration);
entries.TryAdd(key, new CacheEntry(origin, duration));
break;
case JournalOp.Modified:
ParseEntry(line, out key, out origin, out duration);
entries[key] = new CacheEntry(origin, duration);
break;
case JournalOp.Deleted:
ParseEntry(line, out key);
CacheEntry oldEntry;
entries.TryRemove(key, out oldEntry);
break;
}
}
catch
{
break;
}
}
}
}
}
finally
{
semaphoreSlim.Release();
}
}
async Task InitializeWithJournal()
{
await journalLock.WaitAsync().ConfigureAwait(false);
try
{
try
{
journalFile = await cacheFolder.GetFileAsync(JournalFileName);
}
catch (Exception)
{
journalFile = null;
}
if (journalFile == null)
{
journalFile = await cacheFolder.CreateFileAsync(JournalFileName, CreationCollisionOption.ReplaceExisting);
return;
}
else
{
string line = null;
using (var stream = await journalFile.OpenStreamForReadAsync().ConfigureAwait(false))
using (var reader = new StreamReader(stream, encoding))
{
while ((line = await reader.ReadLineAsync().ConfigureAwait(false)) != null)
{
try
{
var op = ParseOp(line);
string key;
DateTime origin;
TimeSpan duration;
switch (op)
{
case JournalOp.Created:
ParseEntry(line, out key, out origin, out duration);
entries.TryAdd(key, new CacheEntry(origin, duration));
break;
case JournalOp.Modified:
ParseEntry(line, out key, out origin, out duration);
entries[key] = new CacheEntry(origin, duration);
break;
case JournalOp.Deleted:
ParseEntry(line, out key);
CacheEntry oldEntry;
entries.TryRemove(key, out oldEntry);
break;
}
}
catch
{
break;
}
}
}
}
}
finally
{
journalLock.Release();
}
}
/// <summary>
/// Adds the file to cache and file saving queue if it does not exists.
/// </summary>
/// <param name="key">Key to store/retrieve the file.</param>
/// <param name="bytes">File data in bytes.</param>
/// <param name="duration">Specifies how long an item should remain in the cache.</param>
/// <param name="writeFinished">Write finished.</param>
public virtual async Task AddToSavingQueueIfNotExistsAsync(string key, byte[] bytes, TimeSpan duration, Action writeFinished = null)
{
if (!_fileWritePendingTasks.TryAdd(key, 1))
{
Logger?.Error("Can't save to disk as another write with the same key is pending: " + key);
return;
}
await _currentWriteLock.WaitAsync().ConfigureAwait(false); // Make sure we don't add multiple continuations to the same task
try
{
_currentWrite = _currentWrite.ContinueWith(async t =>
{
await Task.Yield(); // forces it to be scheduled for later
try
{
if (!Directory.Exists(_cachePath))
{
Directory.CreateDirectory(_cachePath);
}
CacheEntry oldEntry;
if (_entries.TryGetValue(key, out oldEntry))
{
string oldFilepath = Path.Combine(_cachePath, oldEntry.FileName);
if (File.Exists(oldFilepath))
{
File.Delete(oldFilepath);
}
}
string filename = key + "." + (long)duration.TotalSeconds;
string filepath = Path.Combine(_cachePath, filename);
await FileStore.WriteBytesAsync(filepath, bytes, CancellationToken.None).ConfigureAwait(false);
_entries[key] = new CacheEntry(DateTime.UtcNow, duration, filename);
writeFinished?.Invoke();
if (Configuration.VerboseLogging)
{
Logger?.Debug(string.Format("File {0} saved to disk cache for key {1}", filepath, key));
}
}
catch (Exception ex) // Since we don't observe the task (it's not awaited, we should catch all exceptions)
{
Logger?.Error(string.Format("An error occured while writing to disk cache for {0}", key), ex);
}
finally
{
byte finishedTask;
_fileWritePendingTasks.TryRemove(key, out finishedTask);
}
});
}
finally
{
_currentWriteLock.Release();
}
}
public async Task AddOrUpdateAsync (string key, Stream stream, CancellationToken token, TimeSpan duration)
{
key = SanitizeKey (key);
bool existed = entries.ContainsKey (key);
string filepath = Path.Combine(basePath, key);
try
{
await fileWriteLock.WaitAsync();
using (var fs = FileStore.GetOutputStream(filepath))
{
await stream.CopyToAsync(fs, BufferSize, token).ConfigureAwait(false);
}
}
finally
{
fileWriteLock.Release();
}
AppendToJournal (existed ? JournalOp.Modified : JournalOp.Created,
key,
DateTime.UtcNow,
duration);
entries[key] = new CacheEntry (DateTime.UtcNow, duration);
}
async Task InitializeWithJournal()
{
await journalLock.WaitAsync().ConfigureAwait(false);
try
{
try
{
journalFile = await cacheFolder.GetFileAsync(JournalFileName);
}
catch (Exception)
{
journalFile = null;
}
if (journalFile == null)
{
journalFile = await cacheFolder.CreateFileAsync(JournalFileName, CreationCollisionOption.ReplaceExisting);
return;
}
else
{
string line = null;
using (var stream = await journalFile.OpenStreamForReadAsync().ConfigureAwait(false))
using (var reader = new StreamReader(stream, encoding))
{
while ((line = await reader.ReadLineAsync().ConfigureAwait(false)) != null)
{
try
{
var op = ParseOp(line);
string key;
DateTime origin;
TimeSpan duration;
switch (op)
{
case JournalOp.Created:
ParseEntry(line, out key, out origin, out duration);
entries.TryAdd(key, new CacheEntry(origin, duration));
break;
case JournalOp.Modified:
ParseEntry(line, out key, out origin, out duration);
entries[key] = new CacheEntry(origin, duration);
break;
case JournalOp.Deleted:
ParseEntry(line, out key);
CacheEntry oldEntry;
entries.TryRemove(key, out oldEntry);
break;
}
}
catch
{
break;
}
}
}
}
}
finally
{
journalLock.Release();
}
}
public async Task AddOrUpdateAsync (string key, byte[] data, TimeSpan duration)
{
key = SanitizeKey (key);
bool existed = entries.ContainsKey (key);
string filepath = Path.Combine(basePath, key);
await FileStore.WriteBytesAsync(filepath, data).ConfigureAwait(false);
AppendToJournal (existed ? JournalOp.Modified : JournalOp.Created,
key,
DateTime.UtcNow,
duration);
entries[key] = new CacheEntry (DateTime.UtcNow, duration);
}
