/// <summary>
/// Disable all calls to execute on resource. Default data is always returned for
/// this resource when disabled.
/// </summary>
/// <param name="resourceKey">The unique key for the resource.</param>
public void DisableResource(string resourceKey)
{
_failCountCache.Insert(resourceKey, failCountLimit * 2, manualDisableTimeout, null, null);
}
/// <summary>
/// Execute any function without parameters and return defined type of result.
/// </summary>
/// <typeparam name="TResult">Return type.</typeparam>
/// <param name="key">The string key of the item.</param>
/// <param name="methodToCall">The method that is called to fetch data.</param>
/// <param name="defaultResult">If cache fetching and methodToCall fails to return data return this value.</param>
/// <param name="timeout">The time to store data in the cache before a new fetch is done.</param>
/// <param name="cacheKeys">The dependencies to other cached items, idetified by their keys.</param>
/// <param name="masterKeys">The master keys that we depend upon. Master keys are used as markers to set up common dependencies without having to create the cache entries first.</param>
/// <param name="resourceKey">Resource name used in Disable() call.</param>
/// <returns>TResult type defined in the call.</returns>
public TResult ExecuteAndCache <TResult>(string key, List <string> cacheKeys, List <string> masterKeys, Func <TResult> methodToCall, TResult defaultResult, TimeSpan timeout, string resourceKey)
{
TResult cachedResult;
bool manuallyDisabled;
if (ResourceIsDisabled(resourceKey, out manuallyDisabled))
{
if (manuallyDisabled)
{
return(defaultResult);
}
return(GetCachedOrDefault(key, _dataCache, defaultResult));
}
// Check for fast return, first check if value has timed out
if (_dataTimeoutCache.Get(key) != null)
{
if (TryGetCached(key, _dataCache, out cachedResult))
{
return(cachedResult);
}
}
// Cache has timed out. First mark that fetching is in progress
if (_fetchFlagCache.AddIfNotExists(key, 1, execTimeout, cacheKeys, masterKeys))
{
try
{
try
{
// Fetch new value
var newValue = methodToCall();
_dataCache.Insert(key, newValue, new TimeSpan(timeout.Ticks + Math.Max(timeout.Ticks, oldDataMaxTimeout.Ticks)), cacheKeys, masterKeys);
_dataTimeoutCache.Insert(key, 1, timeout, cacheKeys, masterKeys);
return(newValue);
}
catch (Exception e)
{
Log.Error("Failed to execute on resource: " + resourceKey, e);
IncFailCount(resourceKey);
if (ResourceIsDisabled(resourceKey))
{
Log.ErrorFormat("Resource {0} is auto disabled for {1} seconds.", resourceKey, failCountTimeout.TotalSeconds);
}
// Remove timeout item because no new data was stored.
_dataTimeoutCache.Remove(key);
// Something went wrong return default
return(defaultResult);
}
}
finally
{
_fetchFlagCache.Remove(key);
}
}
// The fetching is already in progress, return existing data
if (TryGetCachedWithWait(key, _dataCache, out cachedResult))
{
return(cachedResult);
}
return(defaultResult);
}