public IList <ResourceRequiredContext> CombineStylesheets(
IList <ResourceRequiredContext> resources,
ICombinatorSettings settings)
{
var hashCode = resources.GetResourceListHashCode();
var lockName = MakeLockName(hashCode);
return(_lockingCacheManager.Get(lockName, ctx =>
{
if (!_cacheFileService.Exists(hashCode))
{
Combine(resources, hashCode, ResourceType.Style, settings);
}
_combinatorEventMonitor.MonitorCacheEmptied(ctx);
return ProcessCombinedResources(_cacheFileService.GetCombinedResources(hashCode));
}, () => resources));
}
/// <summary>
/// Tries to get the cache entry, if none is present, tries to acquire a lock on the entry so any other process simultaneously requesting the entry
/// has to wait.
/// </summary>
/// <typeparam name="TResult">Type of the computation's result</typeparam>
/// <param name="key">Key for the cache entry</param>
/// <param name="acquire">Delegate for acquiring the cache entry</param>
/// <param name="fallback">If the lock couldn't be acquired and the process timed out, this delegate will be run</param>
/// <returns>Result of either the acquire or the fallback delegate</returns>
public static TResult Get <TResult>(this ILockingCacheManager lockingCacheManager, string key, Func <AcquireContext <string>, TResult> acquire, Func <TResult> fallback)
{
return(lockingCacheManager.Get(key, acquire, fallback, new TimeSpan(0, 0, 4)));
}