/// <summary>
/// Indicates whether the current results can be cached based on the current invocation provided (should only be used by <see cref="CacheInterceptor"/> in the <see cref="CacheInterceptor.AfterExecution"/> method.
/// </summary>
public bool IsResultCacheable(IInvocation currentInvocation, LazyCacheAttributes cacheAttributes)
{
// If the current result may have been modified from its original state, and the current (AfterExecution) invocation resulted in subsequent service calls...
if (CurrentResultProcessedForModification && OtherServiceCallsMadeFrom(currentInvocation))
{
// If method being invoked is NOT marked as always safe to cache (developer has asserted that no sensitive information is being used in a model derived from contained service calls)
// then we cannot cache the current results
if (!cacheAttributes.IsAlwaysSafeToCache)
{
string message = string.Format(
@"Result not cached: {0}.{1}
NOTE: Use the 'AlwaysSafeToCache' attribute on the service method to assert that this derived model is safe to cache from a security perspective.",
currentInvocation.InvocationTarget.GetType().FullName,
currentInvocation.Method.Name);
errorLog.Warn(message);
// Result cannot be cached
return false;
}
}
// Result is cacheable
return true;
}
private object GetValueToCache(IInvocation invocation, LazyCacheAttributes cacheAttributes)
{
object cacheValue;
if (cacheAttributes.CopyOnSet || cacheAttributes.CopyOnGet)
{
cacheValue = serializer.Serialize(invocation.ReturnValue);
}
else
{
cacheValue = invocation.ReturnValue;
}
return cacheValue;
}
private LazyCacheAttributes GetCacheAttributes(MethodInfo invocationTarget)
{
LazyCacheAttributes result;
if (!cacheAttributesByMethodInfo.TryGetValue(invocationTarget, out result))
{
result = new LazyCacheAttributes(invocationTarget.GetCustomAttributes(true));
cacheAttributesByMethodInfo[invocationTarget] = result;
}
return result;
}