/// <summary>
/// Creates the policy.
/// </summary>
/// <returns>The policy.</returns>
/// <param name="item">Item.</param>
protected CacheItemPolicy CreatePolicy(OpenSearchResponseCacheItem item, OpenSearchRequest request)
{
CacheItemPolicy policy = new CacheItemPolicy();
policy.AbsoluteExpiration = DateTime.UtcNow.Add(item.OpenSearchResponse.Validity);
log.DebugFormat("OpenSearch Cache [prepare to store] AbsoluteExpiration {1} {0}", item.OpenSearchUrl, policy.AbsoluteExpiration);
policy.RemovedCallback = new CacheEntryRemovedCallback(this.EntryRemovedCallBack);
if (item.OpenSearchResponse.Entity is IMonitoredOpenSearchable) {
IMonitoredOpenSearchable mos = (IMonitoredOpenSearchable)item.OpenSearchResponse.Entity;
var monitor = new OpenSearchableChangeMonitor(mos, request);
log.DebugFormat("OpenSearch Cache [prepare to store] Monitor {1} {0} ", item.OpenSearchUrl, monitor.UniqueId);
policy.ChangeMonitors.Add(monitor);
}
return policy;
}
public void EntryRemovedCallBack(CacheEntryRemovedArguments arguments)
{
if ( arguments.CacheItem is OpenSearchResponseCacheItem ){
OpenSearchResponseCacheItem item = new OpenSearchResponseCacheItem(arguments.CacheItem);
log.DebugFormat("OpenSearch Cache [remove] reason {1} {0}", item.OpenSearchUrl, arguments.RemovedReason);
}
}
/// <summary>
/// Tries the replace with cache request.
/// </summary>
/// <param name="request">Request.</param>
public void TryReplaceWithCacheRequest(ref OpenSearchRequest request)
{
Stopwatch watch = new Stopwatch();
watch.Start();
CacheItem it = cache.GetCacheItem(request.OpenSearchUrl.ToString());
if (it == null) return;
OpenSearchResponseCacheItem item = new OpenSearchResponseCacheItem(it);
watch.Stop();
log.DebugFormat("OpenSearch Cache [load] {0}", request.OpenSearchUrl);
request = new CachedOpenSearchRequest(item.OpenSearchUrl, item.OpenSearchResponse, request.OriginalParameters, watch.Elapsed);
}
/// <summary>
/// Caches the response.
/// </summary>
/// <param name="request">Request.</param>
/// <param name="response">Response.</param>
public void CacheResponse(OpenSearchRequest request, ref IOpenSearchResponse response)
{
CacheItem it = cache.GetCacheItem(request.OpenSearchUrl.ToString());
if (it != null) return;
if (response.Entity != null && !response.Entity.CanCache)
return;
var clonedResponse = response.CloneForCache();
if (clonedResponse == null)
throw new InvalidOperationException(string.Format("Response cannot be cached because it is null. Check the CloneForCache of the response [{0}] or the CanCache() method of the Opensearchable [{1}] requested", response.GetType(), response.Entity.GetType()));
OpenSearchResponseCacheItem item = new OpenSearchResponseCacheItem(request.OpenSearchUrl, clonedResponse);
CacheItemPolicy policy = this.CreatePolicy(item, request);
log.DebugFormat("OpenSearch Cache [store] {0}", request.OpenSearchUrl);
cache.Set(item, policy);
log.DebugFormat("OpenSearch Cache [count] {0}", cache.GetCount());
}
