private ICachePolicyAdjust ReadAdjustment(string policyKey, CachePolicy basePolicy)
{
var config = ConfigurationManager.GetSection("cachePolicies") as CachePolicySection;
if (config != null)
{
var policies = config.Policies;
foreach (CachePolicyConfigurationElement policySetting in policies)
{
if (policySetting.Key.Equals(policyKey, System.StringComparison.OrdinalIgnoreCase))
{
var policy = basePolicy.Clone();
if (policySetting.AbsoluteSeconds.HasValue)
policy.AbsoluteSeconds = policySetting.AbsoluteSeconds.Value;
if (policySetting.SlidingSeconds.HasValue)
policy.SlidingSeconds = policySetting.SlidingSeconds.Value;
if (policySetting.RefillCount.HasValue)
policy.RefillCount = policySetting.RefillCount.Value;
return new ApplicationSettingPolicyAdjust { ConfiguredPolicy = policy };
}
}
}
// if we authoritatively tried to read the entry and failed none, we cache a noop
return UnchangedPolicyAdjust.Instance;
}
public CachePolicy Adjust(CachePolicy policy)
{
if (ConfiguredPolicy.AbsoluteSeconds != policy.AbsoluteSeconds
|| ConfiguredPolicy.SlidingSeconds != policy.SlidingSeconds
|| ConfiguredPolicy.RefillCount != policy.RefillCount)
{
policy = policy.Clone();
policy.AbsoluteSeconds = ConfiguredPolicy.AbsoluteSeconds;
policy.SlidingSeconds = ConfiguredPolicy.SlidingSeconds;
policy.RefillCount = ConfiguredPolicy.RefillCount;
}
return policy;
}
public CachePolicy ComputePolicy(string key, CachePolicy defaultPolicy)
{
ICachePolicyAdjust adjuster;
if (!s_Cache.TryGetValue(key, out adjuster))
{
adjuster = ReadAdjustment(key, defaultPolicy);
s_Cache[key] = adjuster;
}
if (adjuster != null)
return adjuster.Adjust(defaultPolicy);
else
return defaultPolicy.Clone(); // do nothing, it's easy
}
public CachePolicy ComputePolicy(string policyKey, CachePolicy defaultPolicy)
{
// do nothing, it's easy
return UnchangedPolicyAdjust.Instance.Adjust(defaultPolicy);
}
public CachePolicy Adjust(CachePolicy policy)
{
return policy;
}