/// <summary>
/// Get expirations
/// </summary>
/// <param name="absoluteExpiration"></param>
/// <param name="slidingExpiration"></param>
private void GetExpirations(Alachisoft.NCache.Integrations.EntityFramework.Config.CachePolicy policy, out DateTime absoluteExpiration, out TimeSpan slidingExpiration)
{
absoluteExpiration = Cache.NoAbsoluteExpiration;
slidingExpiration = Cache.NoSlidingExpiration;
switch (policy.ExpirationType)
{
case CachePolicy.Expirations.Absolute:
absoluteExpiration = DateTime.Now.AddSeconds(policy.ExpirationTime);
break;
case CachePolicy.Expirations.Sliding:
slidingExpiration = new TimeSpan(0, 0, policy.ExpirationTime);
break;
}
}
/// <summary>
/// Get policy settings for specified query
/// </summary>
/// <param name="query">Query command</param>
/// <param name="absoluteExpiration">Absolute expiration value as specified in config</param>
/// <param name="slidingExpiration">Sliding expiration value as specified in config</param>
/// <param name="dbType">Target database type</param>
/// <param name="dbSyncDependency">Indicate whether database sycn dependency is enabled or not</param>
/// <returns>True if caching is enabled for the selected policy, false otherwise</returns>
public bool GetEffectivePolicy(string query, out DateTime absoluteExpiration, out TimeSpan slidingExpiration, out CachePolicyElement.DatabaseType dbType, out bool dbSyncDependency, out List <string> parameterList)
{
absoluteExpiration = Cache.NoAbsoluteExpiration;
slidingExpiration = Cache.NoSlidingExpiration;
dbType = CachePolicyElement.DatabaseType.None;
dbSyncDependency = false;
parameterList = null;
bool cacheable = false;
if (query == null)
{
return(cacheable);
}
try
{
this.rwLock.AcquireReaderLock(Timeout.Infinite);
Alachisoft.NCache.Integrations.EntityFramework.Config.CachePolicy selected = null;
QueryPolicyElement queryPolicyElement = this.GetQueryElement(this.cachePolicy.Query, query);
if (queryPolicyElement != null)
{
selected = queryPolicyElement.CachePolicy;
if (selected != null)
{
parameterList = ((QueryCachePolicyElement)selected).CacheableParameterList;
}
else
{
Logger.Instance.TraceError("No cache policy found for the query " + query + ". Not Cacheable.");
}
}
if (selected == null)
{
if (this.cachePolicy.CacheAllQueries)
{
// absoluteExpiration=this.GetQueryElement.
QueryLevelCachePolicyElement queryLevelCachePolicy = this.cachePolicy.APILevelCaching;
dbType = this.cachePolicy.Database;
cacheable = true;
dbSyncDependency = queryLevelCachePolicy.DbSyncDependency;
if (queryLevelCachePolicy.ExpirationType == EntityFramework.Config.CachePolicy.Expirations.Absolute)
{
absoluteExpiration = DateTime.Now.AddSeconds(queryLevelCachePolicy.ExpirationTime);
}
else
{
slidingExpiration = new TimeSpan(0, 0, queryLevelCachePolicy.ExpirationTime);
}
}
return(cacheable);
}
dbType = this.cachePolicy.Database;
cacheable = selected.Enabled;
dbSyncDependency = selected.DbSyncDependency;
this.GetExpirations(selected, out absoluteExpiration, out slidingExpiration);
}
catch (Exception ex)
{
cacheable = false;
}
finally
{
this.rwLock.ReleaseReaderLock();
}
return(cacheable);
}