public override object Remove(string key, LockHandle lockHandle)
{
object obj = null;
string exceptionMessage = null;
try
{
obj = _webCache.Remove(key, lockHandle);
}
catch (Exception e)
{
exceptionMessage = e.Message;
throw;
}
finally
{
try
{
if (_debugConfigurations.IsInLoggingInterval())
{
APILogItem logItem = new APILogItem(key, exceptionMessage);
logItem.Signature = "Remove(string key, LockHandle lockHandle)";
logItem.RuntimeAPILogItem = (RuntimeAPILogItem)_webCache.APILogHashTable[System.Threading.Thread.CurrentThread.ManagedThreadId];
_apiLogger.Log(logItem);
}
}
catch (Exception)
{ }
_webCache.APILogHashTable.Remove(System.Threading.Thread.CurrentThread.ManagedThreadId);
}
return(obj);
}
public override void Delete(string key, LockHandle lockHandle)
{
string exceptionMessage = null;
try
{
_webCache.Delete(key, lockHandle);
}
catch (Exception e)
{
exceptionMessage = e.Message;
throw;
}
finally
{
try
{
if (_debugConfigurations.IsInLoggingInterval())
{
APILogItem logItem = new APILogItem(key, exceptionMessage);
logItem.Signature = "Delete(string key, LockHandle lockHandle)";
_apiLogger.Log(logItem);
}
}
catch (Exception)
{ }
}
}
public override void Insert(string key, CacheItem item, LockHandle lockHandle, bool releaseLock)
{
string exceptionMessage = null;
try
{
_webCache.Insert(key, item, lockHandle, releaseLock);
}
catch (Exception e)
{
exceptionMessage = e.Message;
throw;
}
finally
{
try
{
if (_debugConfigurations.IsInLoggingInterval())
{
APILogItem logItem = new APILogItem(key, item, exceptionMessage);
logItem.Signature = "Insert(string key, CacheItem item, LockHandle lockHandle, bool releaseLock)";
logItem.RuntimeAPILogItem = (RuntimeAPILogItem)_webCache.APILogHashTable[System.Threading.Thread.CurrentThread.ManagedThreadId];
_apiLogger.Log(logItem);
}
}
catch (Exception)
{ }
_webCache.APILogHashTable.Remove(System.Threading.Thread.CurrentThread.ManagedThreadId);
}
}
public override bool Lock(string key, TimeSpan lockTimeout, out LockHandle lockHandle)
{
bool result;
string exceptionMessage = null;
try
{
result = _webCache.Lock(key, lockTimeout, out lockHandle);
}
catch (Exception e)
{
exceptionMessage = e.Message;
throw;
}
finally
{
try
{
if (_debugConfigurations.IsInLoggingInterval())
{
APILogItem logItem = new APILogItem(key, exceptionMessage);
logItem.Signature = "Lock(string key, TimeSpan lockTimeout, out LockHandle lockHandle)";
logItem.LockTimeout = lockTimeout;
_apiLogger.Log(logItem);
}
}
catch (Exception)
{ }
}
return(result);
}
public override object Get(string key, TimeSpan lockTimeout, ref LockHandle lockHandle, bool acquireLock)
{
Object obj = null;
try
{
obj = _webCache.Get(key, lockTimeout, ref lockHandle, acquireLock);
}
finally
{
try
{
if (_debugConfigurations.IsInLoggingInterval())
{
APILogItem logItem = new APILogItem();
logItem.Signature = "Get(string key, TimeSpan lockTimeout, ref LockHandle lockHandle, bool acquireLock)";
logItem.Key = key;
logItem.LockTimeout = lockTimeout;
logItem.AcquireLock = acquireLock;
logItem.RuntimeAPILogItem = (RuntimeAPILogItem)_webCache.APILogHashTable[System.Threading.Thread.CurrentThread.ManagedThreadId];
_apiLogger.Log(logItem);
}
}
catch (Exception)
{ }
_webCache.APILogHashTable.Remove(System.Threading.Thread.CurrentThread.ManagedThreadId);
}
return(obj);
}
public override CacheItem GetCacheItem(string key, TimeSpan lockTimeout, ref LockHandle lockHandle, bool acquireLock)
{
CacheItem cItem = null;
string exceptionMessage = null;
try
{
cItem = _webCache.GetCacheItem(key, lockTimeout, ref lockHandle, acquireLock);
}
catch (Exception e)
{
exceptionMessage = e.Message;
throw;
}
finally
{
try
{
if (_debugConfigurations.IsInLoggingInterval())
{
APILogItem logItem = new APILogItem(key, exceptionMessage);
logItem.Signature = "GetCacheItem(string key, TimeSpan lockTimeout, ref LockHandle lockHandle, bool acquireLock)";
logItem.LockTimeout = lockTimeout;
logItem.AcquireLock = acquireLock;
logItem.RuntimeAPILogItem = (RuntimeAPILogItem)_webCache.APILogHashTable[System.Threading.Thread.CurrentThread.ManagedThreadId];
_apiLogger.Log(logItem);
}
}
catch (Exception)
{ }
_webCache.APILogHashTable.Remove(System.Threading.Thread.CurrentThread.ManagedThreadId);
}
return(cItem);
}
public static void Main(string[] args)
{
try
{
//Initialize cache
Cache cache;
cache = NCache.InitializeCache("mypartitionedcache");
cache.Clear();
//Locking prevents multiple clients from updating the same data simultaneously
//and also provides the data consistency.
//Adding an item the cache
Customer customer = new Customer();
customer.Name = "Kirsten Goli";
customer.Age = 40;
customer.Address = "45-A West Boulevard, Cartago, Costa Rica";
customer.Gender = "Female";
customer.ContactNo = "52566-1779";
cache.Add("Customer:KirstenGoli", customer);
//Get
TimeSpan timeSpan = new TimeSpan(0,0,0,20);
LockHandle lockHandle = new LockHandle();
Customer getCustomer = (Customer) cache.Get("Customer:KirstenGoli", timeSpan, ref lockHandle, true);
PrintCustomerDetails(getCustomer);
Console.WriteLine("Lock acquired on " + lockHandle.LockId);
//Lock item in cache
bool isLocked = cache.Lock("Customer:KirstenGoli", timeSpan, out lockHandle);
if (!isLocked)
{
Console.WriteLine("Lock acquired on " + lockHandle.LockId);
}
//Unlock item in cache
cache.Unlock("Customer:KirstenGoli");
//Unlock via lockhandle
cache.Unlock("Customer:KirstenGoli", lockHandle);
//Must dispose cache
cache.Dispose();
Environment.Exit(0);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Environment.Exit(0);
}
}
internal virtual void Delete(string key, LockHandle lockHandle, LockAccessType accessType)
{
if (_cacheImpl == null) throw new OperationFailedException("Cache is not initialized");
if (key == null) throw new ArgumentNullException("key");
if (key == string.Empty) throw new ArgumentException("key cannot be empty string");
try
{
UsageStats stats = new UsageStats();
stats.BeginSample();
object lockId = (lockHandle == null) ? null : lockHandle.LockId;
BitSet flagMap = new BitSet();
_cacheImpl.Delete(key, flagMap, lockId, accessType);
}
catch (Exception)
{
if (ExceptionsEnabled) throw;
}
}
internal virtual object GetInternal(string key, LockAccessType accessType, TimeSpan lockTimeout, ref LockHandle lockHandle)
{
if (_cacheImpl == null) throw new OperationFailedException("Cache is not initialized");
if (key == null) throw new ArgumentNullException("key");
if (key == string.Empty) throw new ArgumentException("key cannot be empty string");
long objectSize = 0;
CompressedValueEntry result = null;
try
{
BitSet flagMap = new BitSet();
UsageStats stats = new UsageStats();
stats.BeginSample();
result = _cacheImpl.Get(key, flagMap, ref lockHandle, lockTimeout, accessType);
if (_perfStatsCollector != null)
{
stats.EndSample();
_perfStatsCollector.IncrementMsecPerGetSample(stats.Current);
_perfStatsCollector.IncrementGetPerSecStats();
}
if (result != null && result.Value != null)
{
if (result.Value is CallbackEntry)
{
CallbackEntry e = result.Value as CallbackEntry;
result.Value = e.Value;
}
if (DebugAPIConfiguraions.LoggingEnabled)
objectSize = result.Value is byte[] ? ((byte[])result.Value).Length : 0;
result.Value = SafeDeserialize(result.Value, _serializationContext, result.Flag);
if (DebugAPIConfiguraions.LoggingEnabled)
LogSizeInfo(false, objectSize);
return result.Value;
}
}
catch (Exception)
{
if (ExceptionsEnabled) throw;
else return null;
}
return null;
}
/// <summary>
/// Inserts a <see cref="CacheItem"/> to the cache if not already existing.
/// Otherwise updates an existing item if it not already locked or if the correct lock-id is specified.
/// </summary>
/// <param name="key">The cache key used to reference the item.</param>
/// <param name="item">The item that is to be stored</param>
/// <param name="lockHandle">An instance of <see cref="LockHandle"/>. If the item is locked, then it can be updated only if the correct lockHandle is specified.</param>
/// <param name="releaseLock">A flag to determine whether or not release lock after operation is performed.</param>
/// <remarks>If lockId does not match with the lockId associated with cached item,
/// an exception will be thrown.</remarks>
/// <example>The following example demonstrates how to update a locked item in the cache.
///
/// First create a CacheItem.
/// <code>
/// Cache theCache = NCache.InitializeCache("myreplicatedcache");
/// </code>
/// Add an item int the cache.
/// <code>
/// theCache.Add("cachedItemKey", new CacheItem("cachedItemValue"));
/// </code>
/// Create the objects for lockid and lockdate.
/// <code>
/// LockHandle lockHandle = new LockHandle();
/// </code>
/// Get the added item from cache and acquire a lock.
/// <code>
/// object cachedItem = theCache.Get("cachedItemKey", Cache.NoLockingExpiration, ref lockHandle, true);
/// if (cachedItem != null)
/// {
/// try
/// {
/// theCache.Insert("cachedItemKey", new CacheItem("someothervalue"), lockHandle, true);
/// string cachedValue = (string)theCache.Get("cachedItemKey");
/// }
/// catch (OperationFailedException ex)
/// {
/// //Do something
/// }
/// }
/// </code>
/// </example>
public virtual void Insert(string key, CacheItem item, LockHandle lockHandle, bool releaseLock)
{
if (item == null)
throw new ArgumentNullException("CacheItem");
LockAccessType accessType = releaseLock ? LockAccessType.RELEASE : LockAccessType.DONT_RELEASE;
long size = 0;
InsertOperation(key, item.Value,
item.AbsoluteExpiration, item.SlidingExpiration,
item.Priority,
lockHandle,
accessType,
item.CacheItemUpdatedCallback,
item.CacheItemRemovedCallback,
item.ItemUpdatedCallabackDataFilter,
item.ItemRemovedCallabackDataFilter, ref size, true);
}
/// <summary>
/// Removes an item from cache if it is not already locked or if the correct lock-id is specified.
/// </summary>
/// <param name="key">key of item to be removed</param>
/// <param name="lockHandle">If the item is locked then, it can be removed only if the correct lockHandle is specified.</param>
/// <returns>The item removed from the Cache. If the value in the key parameter
/// is not found, returns a null reference (Nothing in Visual Basic).</returns>
/// <example>The following example demonstrates how to remove a locked item from the cache.
///
/// First create a CacheItem.
/// <code>
/// Cache theCache = NCache.InitializeCache("myreplicatedcache");
/// </code>
/// Add an item int the cache.
/// <code>
/// theCache.Add("cachedItemKey", "cachedItemValue");
/// </code>
/// Create the lock-handle.
/// <code>
/// LockHandle lockHandle = new LockHandle();
/// </code>
/// Get the added item from cache and acquire a lock.
/// <code>
/// object cachedItem = theCache.Get("cachedItemKey", ref lockHandle, true);
/// if (cachedItem != null)
/// {
/// try
/// {
/// //Now remove the cached item using lockHandle acquired earlier.
/// object removedItem = theCache.Remove("cachedItemKey", lockHandle);
/// }
/// catch (OperationFailedException ex)
/// {
/// //Do something
/// }
/// }
/// </code>
/// </example>
public virtual object Remove(string key, LockHandle lockHandle)
{
return Remove(key, lockHandle, LockAccessType.DEFAULT);
}
internal override bool IsLocked(string key, ref LockHandle lockHandle)
{
if (_nCache != null)
{
object lockId = null;
DateTime lockDate = new DateTime();
if (lockHandle == null) lockHandle = new LockHandle();
bool result = _nCache.IsLocked(key, ref lockId, ref lockDate, new OperationContext(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation));
lockHandle.LockId = lockId == null ? "" : lockId as string;
lockHandle.LockDate = lockDate;
return result;
}
return false;
}
public override void Insert(string key, CacheItem item, LockHandle lockHandle, bool releaseLock)
{
string exceptionMessage = null;
try
{
_webCache.Insert(key, item, lockHandle, releaseLock);
}
catch (Exception e)
{
exceptionMessage = e.Message;
throw;
}
finally
{
try
{
if (_debugConfigurations.IsInLoggingInterval())
{
APILogItem logItem = new APILogItem(key, item, exceptionMessage);
logItem.Signature = "Insert(string key, CacheItem item, LockHandle lockHandle, bool releaseLock)";
logItem.RuntimeAPILogItem = (RuntimeAPILogItem)_webCache.APILogHashTable[System.Threading.Thread.CurrentThread.ManagedThreadId];
_apiLogger.Log(logItem);
}
}
catch (Exception)
{ }
_webCache.APILogHashTable.Remove(System.Threading.Thread.CurrentThread.ManagedThreadId);
}
}
public object Get(string key, ref LockHandle lockHandle, bool acquireLock, bool enableRetry)
{
object value = null;
int retry = _operationRetry;
do
{
try
{
value = _cache.Get(key, Alachisoft.NCache.Web.Caching.Cache.NoLockExpiration, ref lockHandle, acquireLock);
break;
}
catch (Exception ex)
{
string message = ex.Message;
if (message != null && !(message.ToLower().Contains("connection with server") ||
message.ToLower().Contains("no server is available")) || !enableRetry)
{
throw;
}
if (retry <= 0)
throw ex;
retry--;
if (_operationRetryDelayInterval > 0)
Thread.Sleep(_operationRetryDelayInterval);
}
}
while (retry >= 0);
return value;
}
public virtual CompressedValueEntry Get(string key, BitSet flagMap, ref LockHandle lockHandle, TimeSpan lockTimeout, LockAccessType accessType)
{
return(null);
}
internal override void InsertOperation(string key, object value, DateTime absoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, LockHandle lockHandle, LockAccessType accessType, CacheDataNotificationCallback cacheItemUdpatedCallback, CacheDataNotificationCallback cacheItemRemovedCallaback, EventDataFilter itemUpdateDataFilter, EventDataFilter itemRemovedDataFilter, ref long size, bool allowQueryTags)
{
_webCache.InsertOperation(key, value, absoluteExpiration, slidingExpiration, priority, lockHandle, accessType, cacheItemUdpatedCallback, cacheItemRemovedCallaback, itemUpdateDataFilter, itemRemovedDataFilter, ref size, true);
}
public override bool Lock(string key, TimeSpan lockTimeout, out LockHandle lockHandle)
{
bool result;
string exceptionMessage = null;
try
{
result = _webCache.Lock(key, lockTimeout, out lockHandle);
}
catch (Exception e)
{
exceptionMessage = e.Message;
throw;
}
finally
{
try
{
if (_debugConfigurations.IsInLoggingInterval())
{
APILogItem logItem = new APILogItem(key, exceptionMessage);
logItem.Signature = "Lock(string key, TimeSpan lockTimeout, out LockHandle lockHandle)";
logItem.LockTimeout = lockTimeout;
_apiLogger.Log(logItem);
}
}
catch (Exception)
{ }
}
return result;
}
internal virtual bool IsLocked(string key, ref LockHandle lockHandle)
{
return(false);
}
public virtual bool Lock(string key, TimeSpan lockTimeout, out LockHandle lockHandle)
{
lockHandle = null;
return(false);
}
public virtual object GetCacheItem(string key, BitSet flagMap, ref LockHandle lockHandle, TimeSpan lockTimeout, LockAccessType accessType)
{
return(null);
}
public override object Get(string key, TimeSpan lockTimeout, ref LockHandle lockHandle, bool acquireLock)
{
Object obj = null;
try
{
obj = _webCache.Get(key, lockTimeout, ref lockHandle, acquireLock);
}
finally
{
try
{
if (_debugConfigurations.IsInLoggingInterval())
{
APILogItem logItem = new APILogItem();
logItem.Signature = "Get(string key, TimeSpan lockTimeout, ref LockHandle lockHandle, bool acquireLock)";
logItem.Key = key;
logItem.LockTimeout = lockTimeout;
logItem.AcquireLock = acquireLock;
logItem.RuntimeAPILogItem = (RuntimeAPILogItem)_webCache.APILogHashTable[System.Threading.Thread.CurrentThread.ManagedThreadId];
_apiLogger.Log(logItem);
}
}
catch (Exception)
{ }
_webCache.APILogHashTable.Remove(System.Threading.Thread.CurrentThread.ManagedThreadId);
}
return obj;
}
public void Insert(string key, CacheItem item, LockHandle lockHandle, bool releaseLock, bool enableRetry)
{
int retry = _operationRetry;
do
{
try
{
_cache.Insert(key, item, lockHandle, releaseLock);
break;
}
catch(Exception ex)
{
string message = ex.Message;
if (message != null && !(message.ToLower().Contains("connection with server") ||
message.ToLower().Contains("no server is available")) || !enableRetry)
{
throw;
}
if (retry <= 0)
throw ex;
retry--;
if (_operationRetryDelayInterval > 0)
Thread.Sleep(_operationRetryDelayInterval);
}
} while (retry >= 0);
}
internal override object GetInternal(string key, LockAccessType accessType, TimeSpan lockTimeout, ref LockHandle lockHandle)
{
return(_webCache.GetInternal(key, accessType, lockTimeout, ref lockHandle));
}
public override object Remove(string key, LockHandle lockHandle)
{
object obj = null;
string exceptionMessage = null;
try
{
obj = _webCache.Remove(key, lockHandle);
}
catch (Exception e)
{
exceptionMessage = e.Message;
throw;
}
finally
{
try
{
if (_debugConfigurations.IsInLoggingInterval())
{
APILogItem logItem = new APILogItem(key, exceptionMessage);
logItem.Signature = "Remove(string key, LockHandle lockHandle)";
logItem.RuntimeAPILogItem = (RuntimeAPILogItem)_webCache.APILogHashTable[System.Threading.Thread.CurrentThread.ManagedThreadId];
_apiLogger.Log(logItem);
}
}
catch (Exception)
{ }
_webCache.APILogHashTable.Remove(System.Threading.Thread.CurrentThread.ManagedThreadId);
}
return obj;
}
public object Remove(string key, LockHandle lockHandle, bool enableRetry)
{
object value = null;
int retry = _operationRetry;
do{
try
{
value = _cache.Remove(key, lockHandle);
break;
}
catch(Exception ex)
{
string message = ex.Message;
if (message != null && !(message.ToLower().Contains("connection with server") ||
message.ToLower().Contains("no server is available")) || !enableRetry)
{
throw;
}
if (retry <= 0)
throw ex;
retry--;
if (_operationRetryDelayInterval > 0)
Thread.Sleep(_operationRetryDelayInterval);
}
}
while(retry>=0);
return value;
}
public override object GetCacheItem(string key, BitSet flagMap, ref LockHandle lockHandle, TimeSpan lockTimeout, LockAccessType accessType)
{
if (lockHandle == null) lockHandle = new LockHandle();
object lockId = lockHandle.LockId;
DateTime lockDate = new DateTime();
OperationContext operationContext = new OperationContext(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation);
operationContext.Add(OperationContextFieldName.GenerateQueryInfo, true);
CacheEntry entry = _nCache.GetCacheEntry(key, ref lockId, ref lockDate, lockTimeout, accessType, operationContext) as CacheEntry;
if (entry != null)
{
if (entry.Value is CallbackEntry)
{
CallbackEntry cbEntry = entry.Value as CallbackEntry;
if (cbEntry.Value is UserBinaryObject)
{
cbEntry.Value = ((UserBinaryObject)cbEntry.Value).GetFullObject();
}
}
else
{
if (entry.Value is UserBinaryObject)
{
entry.Value = ((UserBinaryObject)entry.Value).GetFullObject();
}
}
}
lockHandle.LockId = lockId == null ? null : lockId as string;
lockHandle.LockDate = lockDate;
return entry;
}
/// <summary>
/// Acquire a lock on an item in cache.
/// </summary>
/// <param name="key">key of cached item to be locked.</param>
/// <param name="lockTimeout">TimeSpan after which the lock is automatically released.</param>
/// <param name="lockHandle">An instance of <see cref="Lockhandle"/> that will be filled in with the lock information if lock is acquired successfully.</param>
/// <returns>Whether or not lock was acquired successfully.</returns>
/// <example>
/// Following example demonstrates how to lock a cached item.
/// <code>
/// ...
/// LockHandle lockHandle = new LockHandle();
/// bool locked = theCache.lock("cachedItemKey", new TimeSpan(0,0,10), out lockHandle);
/// ...
/// </code>
/// </example>
public override bool Lock(string key, TimeSpan lockTimeout, out LockHandle lockHandle)
{
object lockId = null;
DateTime lockDate = DateTime.Now;
lockHandle = null;
if (_nCache != null)
{
bool result = _nCache.Lock(key, lockTimeout, out lockId, out lockDate, new OperationContext(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation));
lockHandle = new LockHandle(lockId == null ? null : lockId as string, lockDate);
return result;
}
return false;
}
public override object GetCacheItem(string key, BitSet flagMap, ref LockHandle lockHandle, TimeSpan lockTimeout, LockAccessType accessType)
{
if (lockHandle == null) lockHandle = new LockHandle();
object lockId = lockHandle.LockId;
GetCacheItemCommand command = new GetCacheItemCommand(key, flagMap, accessType, lockId, lockTimeout);
Request request = _broker.CreateRequest(command);
_broker.ExecuteRequest(request);
CommandResponse res = request.Response;
res.ParseResponse();
lockHandle.LockId = res.LockId as string;
lockHandle.LockDate = res.LockDate;
return res.Item;
}
/// <summary>
/// Retrieves the specified item from the Cache object. If the object is read thru the data source,
///</summary>
/// <param name="key">The identifier for the cache item to retrieve.</param>
/// <returns>The retrieved cache item, or a null reference (Nothing
/// in Visual Basic) if the key is not found.</returns>
/// <exception cref="ArgumentNullException"><paramref name="key"/> contains a null reference (Nothing in Visual Basic).</exception>
/// <exception cref="ArgumentException"><paramref name="key"/> is not serializable.</exception>
/// <remarks>
/// <para><b>Note:</b> If exceptions are enabled through the <see cref="NCache.ExceptionsEnabled"/>
/// setting, this property throws exception incase of failure.</para>
/// </remarks>
/// <example>The following example demonstrates how to retrieve the value cached for an ASP.NET text
/// box server control.
/// <code>
///
/// NCache.Cache.Get("MyTextBox.Value");
///
/// </code>
/// Or simply in a class deriving from <see cref="Alachisoft.NCache.Web.UI.NPage"/> or <see cref="Alachisoft.NCache.Web.UI.NUserControl"/>.
/// <code>
///
/// Cache.Get("MyTextBox.Value");
///
/// </code>
/// </example>
public override CompressedValueEntry Get(string key, BitSet flagMap, ref LockHandle lockHandle, TimeSpan lockTimeout, LockAccessType accessType)
{
object lockId = lockHandle == null ? null : lockHandle.LockId;
DateTime lockDate = new DateTime();
if (_nCache != null)
{
CompressedValueEntry cmpEntry = _nCache.Get(key, flagMap, ref lockId, ref lockDate, lockTimeout, accessType, new OperationContext(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation));
if (cmpEntry != null && cmpEntry.Value != null)
{
//muds:
//incase of inproc local cache we will get the user object directly...
//therefore, we need to confirm if the value is user binary object or not...
if (cmpEntry.Value is UserBinaryObject)
{
if (cmpEntry.Value is UserBinaryObject)
{
UserBinaryObject ubObject = cmpEntry.Value as UserBinaryObject;
cmpEntry.Value = ubObject.GetFullObject();
}
}
}
if (lockHandle == null) lockHandle = new LockHandle();
lockHandle.LockId = lockId == null ? null : lockId as string;
lockHandle.LockDate = lockDate;
return cmpEntry;
}
return null;
}
public override CacheItem GetCacheItem(string key, TimeSpan lockTimeout, ref LockHandle lockHandle, bool acquireLock)
{
CacheItem cItem = null;
string exceptionMessage = null;
try
{
cItem = _webCache.GetCacheItem(key, lockTimeout, ref lockHandle, acquireLock);
}
catch (Exception e)
{
exceptionMessage = e.Message;
throw;
}
finally
{
try
{
if (_debugConfigurations.IsInLoggingInterval())
{
APILogItem logItem = new APILogItem(key, exceptionMessage);
logItem.Signature = "GetCacheItem(string key, TimeSpan lockTimeout, ref LockHandle lockHandle, bool acquireLock)";
logItem.LockTimeout = lockTimeout;
logItem.AcquireLock = acquireLock;
logItem.RuntimeAPILogItem = (RuntimeAPILogItem)_webCache.APILogHashTable[System.Threading.Thread.CurrentThread.ManagedThreadId];
_apiLogger.Log(logItem);
}
}
catch (Exception)
{ }
_webCache.APILogHashTable.Remove(System.Threading.Thread.CurrentThread.ManagedThreadId);
}
return cItem;
}
internal override bool IsLocked(string key, ref LockHandle lockHandle)
{
if (lockHandle == null) lockHandle = new LockHandle();
IsLockedCommand command = new IsLockedCommand(key, lockHandle.LockId);
Request request = _broker.CreateRequest(command);
_broker.ExecuteRequest(request);
CommandResponse res = request.Response;
res.ParseResponse();
lockHandle.LockId = res.LockId as string;
lockHandle.LockDate = res.LockDate;
return res.IsLocked;
}
internal override bool IsLocked(string key, ref LockHandle lockHandle)
{
return(_webCache.IsLocked(key, ref lockHandle));
}
public override bool Lock(string key, TimeSpan lockTimeout, out LockHandle lockHanlde)
{
LockCommand command = new LockCommand(key, lockTimeout);
Request request = _broker.CreateRequest(command);
_broker.ExecuteRequest(request);
CommandResponse res = request.Response;
res.ParseResponse();
lockHanlde = new LockHandle(res.LockId as string, res.LockDate);
return res.LockAcquired;
}
internal override object Remove(string key, LockHandle lockHandle, LockAccessType accessType)
{
return(_webCache.Remove(key, lockHandle, accessType));
}
/// <summary>
/// Acquire a lock on an item in cache.
/// </summary>
/// <param name="key">key of cached item to be locked.</param>
/// <param name="lockTimeout">TimeSpan after which the lock is automatically released.</param>
/// <param name="lockHandle">An instance of <see cref="Lockhandle"/> that will be filled in with the lock information if lock is acquired successfully.</param>
/// <returns>Whether or not lock was acquired successfully.</returns>
/// <example>
/// Following example demonstrates how to lock a cached item.
/// <code>
/// ...
/// LockHandle lockHandle = new LockHandle();
/// bool locked = theCache.lock("cachedItemKey", new TimeSpan(0,0,10), out lockHandle);
/// ...
/// </code>
/// </example>
public virtual bool Lock(string key, TimeSpan lockTimeout, out LockHandle lockHandle)
{
if (_cacheImpl == null) throw new OperationFailedException("Cache is not initialized");
if (key == null) throw new ArgumentNullException("key is null.");
lockHandle = null;
bool lockAcquired = false;
try
{
lockAcquired = _cacheImpl.Lock(key, lockTimeout, out lockHandle);
}
catch (Exception)
{
if (ExceptionsEnabled) throw;
}
return lockAcquired;
}
internal override void Delete(string key, LockHandle lockHandle, LockAccessType accessType)
{
_webCache.Delete(key, lockHandle, accessType);
}
/// <summary>
/// Unlocks a locked cached item if the correct lock-id is specified.
/// </summary>
/// <param name="key">key of a cached item to be unlocked</param>
/// <param name="lockHandle">An instance of <see cref="LockHandle"/> that was generated when lock was acquired.</param>
/// <example>
/// Following example demonstrates how to unlock a cached item.
/// <code>
/// ...
/// theCache.Unlock("cachedItemKey", lockHandle);
/// ...
/// </code>
/// </example>
public virtual void Unlock(string key, LockHandle lockHandle)
{
if (_cacheImpl == null) throw new OperationFailedException("Cache is not initialized");
if (key == null) throw new ArgumentNullException("key is null.");
object lockId = (lockHandle == null) ? null : lockHandle.LockId;
try
{
_cacheImpl.Unlock(key, lockId);
}
catch (Exception)
{
if (ExceptionsEnabled) throw;
}
}
/// <summary>
/// Determines if item in cache is locked.
/// </summary>
/// <param name="key">key of item to check for lock</param>
/// <param name="lockHandle">lockHandle will be set if item is locked</param>
/// <returns>true if the item is locked, false otherwise</returns>
internal virtual bool IsLocked(string key, ref LockHandle lockHandle)
{
if (_cacheImpl == null) throw new OperationFailedException("Cache is not initialized");
if (key == null) throw new ArgumentNullException("key is null.");
try
{
return _cacheImpl.IsLocked(key, ref lockHandle);
}
catch (Exception)
{
if (ExceptionsEnabled) throw;
}
return false;
}
internal virtual CacheItem GetCacheItemInternal(string key, LockAccessType accessType, TimeSpan lockTimeout, ref LockHandle lockHandle)
{
if (_cacheImpl == null) throw new OperationFailedException("Cache is not initialized");
if (key == null) throw new ArgumentNullException("keys");
if (key == string.Empty) throw new ArgumentException("key cannot be empty string");
try
{
CacheItem item = new CacheItem();
Alachisoft.NCache.Caching.CacheEntry entry = null;
BitSet flagMap = new BitSet();
object value = _cacheImpl.GetCacheItem(key, flagMap, ref lockHandle, lockTimeout, accessType);
long objectSize = 0;
if (value == null) return null;
if (value is CacheItem)
{
item = (CacheItem)value;
if (_perfStatsCollector != null && ((CacheItem)value).Value != null && ((CacheItem)value).Value is byte[])
_perfStatsCollector.IncrementAvgItemSize(((byte[])((CacheItem)value).Value).Length);
if (DebugAPIConfiguraions.LoggingEnabled)
objectSize = ((byte[])item.Value).Length;
item.Value = SafeDeserialize(item.Value, _serializationContext, item.FlagMap);
if (item.AbsoluteExpiration != Cache.NoAbsoluteExpiration)
{
item.AbsoluteExpiration = item.AbsoluteExpiration.ToLocalTime();
}
if (DebugAPIConfiguraions.LoggingEnabled)
LogSizeInfo(false, objectSize);
return item;
}
entry = (Alachisoft.NCache.Caching.CacheEntry)value;
item.FlagMap = entry.Flag;
if (entry.Value is CallbackEntry)
{
CallbackEntry cb = (CallbackEntry)entry.Value;
if (cb.ItemRemoveCallbackListener != null && cb.ItemRemoveCallbackListener.Count > 0)
{
foreach (CallbackInfo cbInfo in cb.ItemRemoveCallbackListener)
{
if (cbInfo.Client == _cacheImpl.ClientID)
{
item.SetCacheDataNotification((CacheDataNotificationCallback)_callbackIDsMap.GetResource(cbInfo.Callback), EventType.ItemRemoved);
break;
}
}
}
if (cb.ItemUpdateCallbackListener != null && cb.ItemUpdateCallbackListener.Count > 0)
{
foreach (CallbackInfo cbInfo in cb.ItemUpdateCallbackListener)
{
if (cbInfo.Client == _cacheImpl.ClientID)
{
item.SetCacheDataNotification((CacheDataNotificationCallback)_callbackIDsMap.GetResource(cbInfo.Callback), EventType.ItemUpdated);
break;
}
}
}
item.Value = cb.Value;
if (_perfStatsCollector != null && item.Value != null && item.Value is byte[])
_perfStatsCollector.IncrementAvgItemSize(((byte[])item.Value).Length);
item.Value = SafeDeserialize(cb.Value, _serializationContext, item.FlagMap);
}
else
{
item.Value = entry.Value;
if (_perfStatsCollector != null && item.Value != null && item.Value is byte[])
_perfStatsCollector.IncrementAvgItemSize(((byte[])item.Value).Length);
if (DebugAPIConfiguraions.LoggingEnabled)
objectSize = ((byte[])entry.Value).Length;
item.Value = SafeDeserialize(entry.Value, _serializationContext, item.FlagMap);
}
if (DebugAPIConfiguraions.LoggingEnabled)
LogSizeInfo(false, objectSize);
if (entry != null)
{
item.Priority = (CacheItemPriority)entry.Priority;
}
ExpirationHint hint = entry.ExpirationHint;
DateTime absoluteExpiration = DateTime.MaxValue.ToUniversalTime();
TimeSpan slidingExpiration = TimeSpan.Zero;
Alachisoft.NCache.Caching.AutoExpiration.DependencyHelper.GetActualCacheDependency(hint, ref absoluteExpiration, ref slidingExpiration);
if (absoluteExpiration != Cache.NoAbsoluteExpiration)
{
item.AbsoluteExpiration = absoluteExpiration.ToLocalTime();
}
item.SlidingExpiration = slidingExpiration;
item._creationTime = entry.CreationTime;
item._lastModifiedTime = entry.LastModifiedTime;
return item;
}
catch (Exception)
{
if (ExceptionsEnabled) throw;
}
return null;
}
/// <summary>
/// Removes an item from cache if it is not already locked or if the correct lock-id is specified.
/// </summary>
/// <param name="key">key of item to be removed</param>
/// <param name="lockHandle">If the item is locked then, it can be removed only if the correct lockHandle is specified.</param>
/// <example>The following example demonstrates how to remove a locked item from the cache.
///
/// First create a CacheItem.
/// <code>
/// Cache theCache = NCache.InitializeCache("myreplicatedcache");
/// </code>
/// Add an item int the cache.
/// <code>
/// theCache.Add("cachedItemKey", "cachedItemValue");
/// </code>
/// Create the lock-handle.
/// <code>
/// LockHandle lockHandle = new LockHandle();
/// </code>
/// Get the added item from cache and acquire a lock.
/// <code>
/// object cachedItem = theCache.Get("cachedItemKey", ref lockHandle, true);
/// if (cachedItem != null)
/// {
/// try
/// {
/// //Now remove the cached item using lockHandle acquired earlier.
/// theCache.Delete("cachedItemKey", lockHandle);
/// }
/// catch (OperationFailedException ex)
/// {
/// //Do something
/// }
/// }
/// </code>
/// </example>
public virtual void Delete(string key, LockHandle lockHandle)
{
Delete(key, lockHandle, LockAccessType.DEFAULT);
}
/// <summary>
/// Function that choose the appropriate function of NCache's Cache, that need to be called
/// according to the data provided to it.</summary>
internal virtual void InsertOperation(string key, object value, DateTime absoluteExpiration,
TimeSpan slidingExpiration, CacheItemPriority priority,
LockHandle lockHandle, LockAccessType accessType, CacheDataNotificationCallback cacheItemUdpatedCallback,
CacheDataNotificationCallback cacheItemRemovedCallaback, EventDataFilter itemUpdateDataFilter, EventDataFilter itemRemovedDataFilter, ref long size, bool allowQueryTags)
{
if (_cacheImpl == null) throw new OperationFailedException("Cache is not initialized");
ValidateKeyValue(key, value);
UsageStats stats = new UsageStats();
stats.BeginSample();
Hashtable queryInfo = new Hashtable();
object lockId = (lockHandle == null) ? null : lockHandle.LockId;
if (allowQueryTags)
{
queryInfo["query-info"] = GetQueryInfo(value);
}
short removeCallbackId = -1;
short updateCallbackId = -1;
short dsItemUpdateCallbackId = -1;
BitSet flagMap = new BitSet();
try
{
value = SafeSerialize(value, _serializationContext, ref flagMap, ref size);
long objectSize = 0;
if (DebugAPIConfiguraions.LoggingEnabled)
objectSize = value is byte[] ? ((byte[])value).Length : 0;
if (_perfStatsCollector != null && value != null && value is byte[])
_perfStatsCollector.IncrementAvgItemSize(((byte[])value).Length);
if (cacheItemRemovedCallaback != null)
{
short[] callabackIds = _eventManager.RegisterSelectiveEvent(cacheItemRemovedCallaback, EventType.ItemRemoved, itemRemovedDataFilter);
removeCallbackId = callabackIds[1];
}
if (cacheItemUdpatedCallback != null)
{
short[] callabackIds = _eventManager.RegisterSelectiveEvent(cacheItemUdpatedCallback, EventType.ItemUpdated, itemUpdateDataFilter);
updateCallbackId = callabackIds[0];
}
if (lockId != null && ((string)lockId) != string.Empty)
flagMap.SetBit(BitSetConstants.LockedItem);
else
flagMap.UnsetBit(BitSetConstants.LockedItem);
absoluteExpiration = ToUTC(absoluteExpiration);
_cacheImpl.Insert(key, value, absoluteExpiration, slidingExpiration, priority, removeCallbackId, updateCallbackId, queryInfo, flagMap, lockId, accessType, itemUpdateDataFilter, itemRemovedDataFilter, size);
if (_perfStatsCollector != null)
{
stats.EndSample();
_perfStatsCollector.IncrementMsecPerUpdSample(stats.Current);
_perfStatsCollector.IncrementUpdPerSecStats();
}
}
catch (Exception)
{
if (ExceptionsEnabled) throw;
}
}
public override void Delete(string key, LockHandle lockHandle)
{
string exceptionMessage = null;
try
{
_webCache.Delete(key, lockHandle);
}
catch (Exception e)
{
exceptionMessage = e.Message;
throw;
}
finally
{
try
{
if (_debugConfigurations.IsInLoggingInterval())
{
APILogItem logItem = new APILogItem(key, exceptionMessage);
logItem.Signature = "Delete(string key, LockHandle lockHandle)";
_apiLogger.Log(logItem);
}
}
catch (Exception)
{ }
}
}
internal virtual object Remove(string key, LockHandle lockHandle, LockAccessType accessType)
{
if (_cacheImpl == null) throw new OperationFailedException("Cache is not initialized");
if (key == null) throw new ArgumentNullException("key");
if (key == string.Empty) throw new ArgumentException("key cannot be empty string");
long objectSize = 0;
try
{
UsageStats stats = new UsageStats();
stats.BeginSample();
object lockId = (lockHandle == null) ? null : lockHandle.LockId;
BitSet flagMap = new BitSet();
short dsItemRemovedCallbackId = -1;
CompressedValueEntry result = _cacheImpl.Remove(key, flagMap, lockId, accessType);
if (result != null && result.Value != null)
{
if (result.Value != null && result.Value is CallbackEntry)
{
result.Value = ((CallbackEntry)result.Value).Value;
}
if (DebugAPIConfiguraions.LoggingEnabled)
objectSize = result.Value is byte[] ? ((byte[])result.Value).Length : 0;
result.Value = SafeDeserialize(result.Value, _serializationContext, result.Flag);
if (_perfStatsCollector != null)
{
stats.EndSample();
_perfStatsCollector.IncrementMsecPerDelSample(stats.Current);
_perfStatsCollector.IncrementDelPerSecStats();
}
if (DebugAPIConfiguraions.LoggingEnabled)
LogSizeInfo(false, objectSize);
return result.Value;
}
else
{
if (_perfStatsCollector != null)
{
stats.EndSample();
_perfStatsCollector.IncrementMsecPerDelSample(stats.Current);
_perfStatsCollector.IncrementDelPerSecStats();
}
}
}
catch (Exception)
{
if (ExceptionsEnabled) throw;
}
return null;
}
private SessionStateStoreData getSessionStoreItem(bool acquireLock, HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockID, out SessionStateActions action)
{
//lock age is set to zero, so SessionStateModule will,
//after 0.5 sec, calls this GetItemExclusive function until a value or
//null reference is returned. If no data was found, 'locked' is set to false and
//null reference is returned which tells SessionStateModule to call CreateDataStore
//function to create new data store
locked = false;
lockAge = TimeSpan.Zero;
lockID = null;
action = SessionStateActions.InitializeItem;
DateTime lockDate = DateTime.UtcNow;
LockHandle lockHandle = new LockHandle(null, lockDate);
SessionStateStoreData items = null;
Hashtable table = null;
bool lockTimedOut = false;
try
{
byte[] buffer = null;
lock (s_dataLock)
{
if (s_cacheNeedInit) InitializeCache();
}
if (_lockSessions)
{
try
{
buffer = (byte[])_cache.Get(GetUniqueSessionId(id), ref lockHandle, acquireLock, true);
}
catch (Exception)
{
buffer = (byte[])_cache.Get(GetUniqueSessionId(id), ref lockHandle, acquireLock, false);
}
lockID = lockHandle.LockId == null ? null : lockHandle;
lockDate = lockHandle == null ? DateTime.UtcNow : lockHandle.LockDate;
}
else
{
try
{
buffer = (byte[])_cache.Get(GetUniqueSessionId(id), true);
}
catch (Exception)
{
buffer = (byte[])_cache.Get(GetUniqueSessionId(id), false);
}
}
if (buffer != null)
{
using (MemoryStream stream = new MemoryStream(buffer))
{
BinaryFormatter formatter = new BinaryFormatter();
table = formatter.Deserialize(stream) as Hashtable;
stream.Close();
}
}
if (_lockSessions && !String.IsNullOrEmpty(lockHandle.LockId))
{
DateTime now = DateTime.UtcNow;
if ((0L < lockDate.Ticks) && (lockDate.Ticks < now.Ticks))
{
lockAge = (TimeSpan)(now - lockDate);
}
else
{
lockAge = TimeSpan.Zero;
}
/// Following 'if' block is executed if item is locked.
/// i.e NCache API returns null and out variables are populated with lockId and lockDate
/// Note: Item exists in cache but is locked.
if (table == null)
{
locked = true;
return null;
}
}
/// If item exists in cahce and lock acqusition was successfull or locking was disabled.
if (table != null)
{
items = GetContents(context, table, ref action);
if (action == SessionStateActions.InitializeItem)
{
items = CreateNewStoreData(context, items.Timeout);
}
}
else
{
if(NCacheLog!= null) NCacheLog.Error(id + " :session not found in cache");
}
}
catch (Exception exc)
{
/// If item is not found in Remote cache.
/// Update cookies to do any further operations for this session request on current primary cache;
/// and do not raise exception.
RaiseException(exc, id);
}
finally
{
if ((lockTimedOut || table != null) && context.Items.Contains(SESSION_LOCK_COUNT))
context.Items.Remove(SESSION_LOCK_COUNT);
}
return items;
}
/// <summary>
/// Get the cache item stored in cache.
/// </summary>
/// <param name="key">Key used to reference the desired object</param>
/// <param name="lockTimeout">The TimeSpan after which the lock is automatically released.</param>
/// <param name="lockHandle">An instance of <see cref="LockHandle"/> to hold the lock information.</param>
/// <param name="acquireLock">A flag to determine whether to acquire a lock or not.</param>
/// <returns>The retrieved cache item, or a null reference (Nothing
/// in Visual Basic) if the key is not found.
/// </returns>
/// <remarks>
/// /// <para><b>Note:</b> If exceptions are enabled through the <see cref="ExceptionsEnabled"/>
/// setting, this property throws exception incase of failure.</para>
/// </remarks>
/// <example>The following example demonstrates how to retrieve the value cached for an ASP.NET text
/// box server control.
/// <code>
/// Cache cache = NCache.InitializeCache("myCache");
/// LockHandle lockHandle = new LockHandle();
/// CacheItem item = cache.GetCacheItem("cachedItemKey",TimeSpan.FromSeconds(30) , ref lockHandle, true);
///
/// </code>
/// </example>
public virtual CacheItem GetCacheItem(string key, TimeSpan lockTimeout, ref LockHandle lockHandle, bool acquireLock)
{
try
{
LockAccessType accessType = acquireLock ? LockAccessType.ACQUIRE : LockAccessType.DONT_ACQUIRE;
return GetCacheItemInternal(key, accessType, lockTimeout, ref lockHandle);
}
catch (Exception)
{
if (ExceptionsEnabled) throw;
return null;
}
}
public virtual object GetCacheItem(string key, BitSet flagMap, string group, string subGroup,
ref CacheItemVersion version, ref LockHandle lockHandle, TimeSpan lockTimeout, LockAccessType accessType,
string providerName)
{
return(null);
}
