/// <summary>
/// Instance constructor. Ensures that the storage location in Isolated Storage is prepared
/// for reading and writing. This class stores each individual field of the CacheItem into its own
/// file inside the directory specified by itemDirectoryRoot.
/// </summary>
/// <param name="storage">Isolated Storage area to use. May not be null.</param>
/// <param name="itemDirectoryRoot">Complete path in Isolated Storage where the cache item should be stored. May not be null.</param>
/// <param name="encryptionProvider">Encryption provider</param>
public IsolatedStorageCacheItem(IsolatedStorageFile storage, string itemDirectoryRoot, IStorageEncryptionProvider encryptionProvider)
{
storage.CreateDirectory(itemDirectoryRoot);
keyField = new IsolatedStorageCacheItemField(storage, "Key", itemDirectoryRoot, encryptionProvider);
valueField = new IsolatedStorageCacheItemField(storage, "Val", itemDirectoryRoot, encryptionProvider);
scavengingPriorityField = new IsolatedStorageCacheItemField(storage, "ScPr", itemDirectoryRoot, encryptionProvider);
refreshActionField = new IsolatedStorageCacheItemField(storage, "RA", itemDirectoryRoot, encryptionProvider);
expirationsField = new IsolatedStorageCacheItemField(storage, "Exp", itemDirectoryRoot, encryptionProvider);
lastAccessedField = new IsolatedStorageCacheItemField(storage, "LA", itemDirectoryRoot, encryptionProvider);
}
/// <summary>
/// Instance constructor. Ensures that the storage location in Isolated Storage is prepared
/// for reading and writing. This class stores each individual field of the CacheItem into its own
/// file inside the directory specified by itemDirectoryRoot.
/// </summary>
/// <param name="storage">Isolated Storage area to use. May not be null.</param>
/// <param name="itemDirectoryRoot">Complete path in Isolated Storage where the cache item should be stored. May not be null.</param>
/// <param name="encryptionProvider">Encryption provider</param>
public IsolatedStorageCacheItem(IsolatedStorageFile storage, string itemDirectoryRoot, IStorageEncryptionProvider encryptionProvider)
{
storage.CreateDirectory(itemDirectoryRoot);
keyField = new IsolatedStorageCacheItemField(storage, "Key", itemDirectoryRoot, encryptionProvider);
valueField = new IsolatedStorageCacheItemField(storage, "Val", itemDirectoryRoot, encryptionProvider);
scavengingPriorityField = new IsolatedStorageCacheItemField(storage, "ScPr", itemDirectoryRoot, encryptionProvider);
refreshActionField = new IsolatedStorageCacheItemField(storage, "RA", itemDirectoryRoot, encryptionProvider);
expirationsField = new IsolatedStorageCacheItemField(storage, "Exp", itemDirectoryRoot, encryptionProvider);
lastAccessedField = new IsolatedStorageCacheItemField(storage, "LA", itemDirectoryRoot, encryptionProvider);
}
/// <summary>
/// Instance constructor. Ensures that the storage location in Isolated Storage is prepared
/// for reading and writing. This class stores each individual field of the CacheItem into its own
/// file inside the directory specified by itemDirectoryRoot.
/// </summary>
/// <param name="storage">Isolated Storage area to use. May not be null.</param>
/// <param name="itemDirectoryRoot">Complete path in Isolated Storage where the cache item should be stored. May not be null.</param>
/// <param name="encryptionProvider">Encryption provider</param>
public IsolatedStorageCacheItem(IsolatedStorageFile storage, string itemDirectoryRoot, IStorageEncryptionProvider encryptionProvider)
{
if (storage.GetDirectoryNames(itemDirectoryRoot).Length == 0)
{
// avoid creating if already exists - work around for partial trust
storage.CreateDirectory(itemDirectoryRoot);
}
keyField = new IsolatedStorageCacheItemField(storage, "Key", itemDirectoryRoot, encryptionProvider);
valueField = new IsolatedStorageCacheItemField(storage, "Val", itemDirectoryRoot, encryptionProvider);
scavengingPriorityField = new IsolatedStorageCacheItemField(storage, "ScPr", itemDirectoryRoot, encryptionProvider);
refreshActionField = new IsolatedStorageCacheItemField(storage, "RA", itemDirectoryRoot, encryptionProvider);
expirationsField = new IsolatedStorageCacheItemField(storage, "Exp", itemDirectoryRoot, encryptionProvider);
lastAccessedField = new IsolatedStorageCacheItemField(storage, "LA", itemDirectoryRoot, encryptionProvider);
}
/// <summary>
/// Instance constructor. Ensures that the storage location in Isolated Storage is prepared
/// for reading and writing. This class stores each individual field of the CacheItem into its own
/// file inside the directory specified by itemDirectoryRoot.
/// </summary>
/// <param name="storage">Isolated Storage area to use. May not be null.</param>
/// <param name="itemDirectoryRoot">Complete path in Isolated Storage where the cache item should be stored. May not be null.</param>
/// <param name="encryptionProvider">Encryption provider</param>
public IsolatedStorageCacheItem(IsolatedStorageFile storage, string itemDirectoryRoot, IStorageEncryptionProvider encryptionProvider)
{
if (storage.GetDirectoryNames(itemDirectoryRoot).Length == 0)
{
// avoid creating if already exists - work around for partial trust
storage.CreateDirectory(itemDirectoryRoot);
}
keyField = new IsolatedStorageCacheItemField(storage, "Key", itemDirectoryRoot, encryptionProvider);
valueField = new IsolatedStorageCacheItemField(storage, "Val", itemDirectoryRoot, encryptionProvider);
scavengingPriorityField = new IsolatedStorageCacheItemField(storage, "ScPr", itemDirectoryRoot, encryptionProvider);
refreshActionField = new IsolatedStorageCacheItemField(storage, "RA", itemDirectoryRoot, encryptionProvider);
expirationsField = new IsolatedStorageCacheItemField(storage, "Exp", itemDirectoryRoot, encryptionProvider);
lastAccessedField = new IsolatedStorageCacheItemField(storage, "LA", itemDirectoryRoot, encryptionProvider);
}
public IsolatedStorageCacheItem(IsolatedStorageFile storage, string itemDirectoryRoot, IStorageEncryptionProvider encryptionProvider)
{
int retriesLeft = MaxRetries;
while (true)
{
try
{
storage.CreateDirectory(itemDirectoryRoot);
using (IsolatedStorageFileStream fileStream =
new IsolatedStorageFileStream(itemDirectoryRoot + @"\sanity-check.txt", FileMode.Create, FileAccess.Write, FileShare.None, storage))
{ }
break;
}
catch (UnauthorizedAccessException)
{
if (retriesLeft-- > 0)
{
Thread.Sleep(RetryDelayInMilliseconds);
continue;
}
throw;
}
catch (DirectoryNotFoundException)
{
if (retriesLeft-- > 0)
{
Thread.Sleep(RetryDelayInMilliseconds);
continue;
}
throw;
}
}
keyField = new IsolatedStorageCacheItemField(storage, "Key", itemDirectoryRoot, encryptionProvider);
valueField = new IsolatedStorageCacheItemField(storage, "Val", itemDirectoryRoot, encryptionProvider);
scavengingPriorityField = new IsolatedStorageCacheItemField(storage, "ScPr", itemDirectoryRoot, encryptionProvider);
refreshActionField = new IsolatedStorageCacheItemField(storage, "RA", itemDirectoryRoot, encryptionProvider);
expirationsField = new IsolatedStorageCacheItemField(storage, "Exp", itemDirectoryRoot, encryptionProvider);
lastAccessedField = new IsolatedStorageCacheItemField(storage, "LA", itemDirectoryRoot, encryptionProvider);
}
/// <summary>
/// Instance constructor. Ensures that the storage location in Isolated Storage is prepared
/// for reading and writing. This class stores each individual field of the CacheItem into its own
/// file inside the directory specified by itemDirectoryRoot.
/// </summary>
/// <param name="storage">Isolated Storage area to use. May not be null.</param>
/// <param name="itemDirectoryRoot">Complete path in Isolated Storage where the cache item should be stored. May not be null.</param>
/// <param name="encryptionProvider">Encryption provider</param>
public IsolatedStorageCacheItem(IsolatedStorageFile storage, string itemDirectoryRoot, IStorageEncryptionProvider encryptionProvider)
{
if (storage == null)
{
throw new ArgumentNullException("storage");
}
int retriesLeft = MaxRetries;
while (true)
{
// work around - attempt to write a file in the folder to determine whether delayed io
// needs to be processed
// since only a limited number of retries will be attempted, some extreme cases may
// still fail if file io is deferred long enough.
// while it's still possible that the deferred IO is still pending when the item that failed
// to be added is removed by the cleanup code, thus making the cleanup fail,
// the item should eventually be removed (by the original removal)
try
{
storage.CreateDirectory(itemDirectoryRoot);
// try to write a file
// if there is a pending operation or the folder is gone, this should find the problem
// before writing an actual field is attempted
using (IsolatedStorageFileStream fileStream =
new IsolatedStorageFileStream(itemDirectoryRoot + @"\sanity-check.txt", FileMode.Create, FileAccess.Write, FileShare.None, storage))
{ }
break;
}
catch (UnauthorizedAccessException)
{
// there are probably pending operations on the directory - retry if allowed
if (retriesLeft-- > 0)
{
Thread.Sleep(RetryDelayInMilliseconds);
continue;
}
throw;
}
catch (DirectoryNotFoundException)
{
// a pending deletion on the directory was processed before creating the file
// but after attempting to create it - retry if allowed
if (retriesLeft-- > 0)
{
Thread.Sleep(RetryDelayInMilliseconds);
continue;
}
throw;
}
}
keyField = new IsolatedStorageCacheItemField(storage, "Key", itemDirectoryRoot, encryptionProvider);
valueField = new IsolatedStorageCacheItemField(storage, "Val", itemDirectoryRoot, encryptionProvider);
scavengingPriorityField = new IsolatedStorageCacheItemField(storage, "ScPr", itemDirectoryRoot, encryptionProvider);
refreshActionField = new IsolatedStorageCacheItemField(storage, "RA", itemDirectoryRoot, encryptionProvider);
expirationsField = new IsolatedStorageCacheItemField(storage, "Exp", itemDirectoryRoot, encryptionProvider);
lastAccessedField = new IsolatedStorageCacheItemField(storage, "LA", itemDirectoryRoot, encryptionProvider);
}