public ActionResult GetPolicy(string slug)
{
MicrosoftDynamicsCRMadoxioPolicydocument policyDocument = null;
string cacheKey = CacheKeys.PolicyDocumentPrefix + slug;
if (!_cache.TryGetValue(cacheKey, out policyDocument))
{
// Key not in cache, so get data.
policyDocument = _dynamicsClient.GetPolicyDocumentBySlug(slug);
// Set cache options.
var cacheEntryOptions = new MemoryCacheEntryOptions()
// Keep in cache for this time
.SetAbsoluteExpiration(TimeSpan.FromMinutes(5));
// Save data in cache.
_cache.Set(cacheKey, policyDocument, cacheEntryOptions);
}
if (policyDocument == null)
{
return(new NotFoundResult());
}
else
{
return(Json(policyDocument.ToViewModel()));
}
}
public ActionResult GetPolicy(string slug)
{
MicrosoftDynamicsCRMadoxioPolicydocument policyDocument = null;
bool fetchDocument = false;
string cacheKey = CacheKeys.PolicyDocumentPrefix + slug;
string cacheAgeKey = CacheKeys.PolicyDocumentCategoryPrefix + slug + "_dto";
if (!_cache.TryGetValue(cacheKey, out policyDocument))
// item is not in cache at all, fetch.
{
fetchDocument = true;
}
else
{
DateTimeOffset dto = DateTimeOffset.Now;
// fetch the age of the cache item from the cache
if (!_cache.TryGetValue(cacheAgeKey, out dto))
// unable to get cache age, fetch.
{
fetchDocument = true;
}
else
{
TimeSpan age = DateTimeOffset.Now - dto;
if (age.TotalMinutes > 10)
// More than 10 minutes old, fetch.
{
fetchDocument = true;
}
}
}
if (fetchDocument)
{
try
{
policyDocument = _dynamicsClient.GetPolicyDocumentBySlug(slug);
if (policyDocument != null) // handle case where the document is missing.
{
// Set cache options.
var newCacheEntryOptions = new MemoryCacheEntryOptions()
// Set the cache to expire far in the future.
.SetAbsoluteExpiration(TimeSpan.FromDays(365 * 5));
// Save data in cache.
_cache.Set(cacheKey, policyDocument, newCacheEntryOptions);
_cache.Set(cacheAgeKey, DateTimeOffset.Now, newCacheEntryOptions);
}
else
{
_logger.LogError($"Unable to get Policy Document {slug} - does it exist?");
}
}
catch (HttpOperationException httpOperationException)
{
// this will gracefully handle situations where Dynamics is not available however we have a cache version.
_logger.LogError(httpOperationException, "Error getting policy document");
}
catch (Exception e)
{
// unexpected exception
_logger.LogError(e, "Unknown error occured");
}
}
if (policyDocument == null)
{
return(new NotFoundResult());
}
return(new JsonResult(policyDocument.ToViewModel()));
}