private static Possible <ICache, Failure> InitializeCache(ICacheConfigData cacheData, Guid activityId)
{
using (var eventing = new InitializeCacheActivity(BasicFilesystemCache.EventSource, activityId, typeof(BasicFilesystemCache).FullName))
{
eventing.Start(cacheData);
var possibleCacheConfig = cacheData.Create <Config>();
if (!possibleCacheConfig.Succeeded)
{
return(eventing.StopFailure(possibleCacheConfig.Failure));
}
Config cacheConfig = possibleCacheConfig.Result;
// instantiate new BasicFilesystemCache
try
{
return(eventing.Returns(new BasicFilesystemCache(
cacheConfig.CacheId,
cacheConfig.CacheRootPath,
cacheConfig.ReadOnly,
cacheConfig.StrictMetadataCasCoupling,
cacheConfig.IsAuthoritative,
cacheConfig.ContentionBackoffMaxMilliseonds,
cacheConfig.DefaultFingerprintMinimumAgeMinutes)));
}
catch (Exception e)
{
return(eventing.StopFailure(new CacheConstructionFailure(cacheConfig.CacheId, e)));
}
}
}
/// <inheritdoc />
public async Task <Possible <ICache, Failure> > InitializeCacheAsync(ICacheConfigData cacheData, Guid activityId)
{
Contract.Requires(cacheData != null);
using (var eventing = new InitializeCacheActivity(VerticalCacheAggregator.EventSource, activityId, typeof(VerticalCacheAggregator).FullName))
{
eventing.Start(cacheData);
var possibleCacheConfig = cacheData.Create <Config>();
if (!possibleCacheConfig.Succeeded)
{
return(eventing.StopFailure(possibleCacheConfig.Failure));
}
Config cacheAggregatorConfig = possibleCacheConfig.Result;
// temporary
if (cacheAggregatorConfig.PreFetchCasData == true)
{
throw new NotImplementedException();
}
// initialize local cache
var maybeCache = await CacheFactory.InitializeCacheAsync(cacheAggregatorConfig.LocalCache, activityId);
if (!maybeCache.Succeeded)
{
return(eventing.StopFailure(maybeCache.Failure));
}
ICache local = maybeCache.Result;
if (local.IsReadOnly)
{
Analysis.IgnoreResult(await local.ShutdownAsync(), justification: "Okay to ignore shutdown status");
return(eventing.StopFailure(new VerticalCacheAggregatorNeedsWriteableLocalFailure(local.CacheId)));
}
maybeCache = await CacheFactory.InitializeCacheAsync(cacheAggregatorConfig.RemoteCache, activityId);
if (!maybeCache.Succeeded)
{
eventing.Write(CacheActivity.CriticalDataOptions, new { RemoteCacheFailed = maybeCache.Failure });
if (cacheAggregatorConfig.FailIfRemoteFails)
{
Analysis.IgnoreResult(await local.ShutdownAsync(), justification: "Okay to ignore shutdown status");
return(eventing.StopFailure(maybeCache.Failure));
}
// If the remote cache does not construct, we fall back to just the local.
// This is basically like a disconnected state only we are starting disconnnected
// and thus are just the local cache now. We can just return the local and
// not add the overhead of the aggregator.
string failureMessage = string.Format(
System.Globalization.CultureInfo.InvariantCulture,
RemoteConstructionFailureWarning,
local.CacheId);
// Note: Compiler is confused and needs help converting ICache to Possible here but not a few lines below.
return(eventing.Returns(new MessageForwardingCache(new Failure[] { maybeCache.Failure.Annotate(failureMessage) }, local)));
}
ICache remote = maybeCache.Result;
bool readOnlyRemote = remote.IsReadOnly || cacheAggregatorConfig.RemoteIsReadOnly;
try
{
// instantiate new VerticalCacheAggregator
return(eventing.Returns(new VerticalCacheAggregator(
local,
remote,
readOnlyRemote,
cacheAggregatorConfig.WriteThroughCasData,
cacheAggregatorConfig.RemoteContentIsReadOnly)));
}
catch (Exception e)
{
string cacheId = local.CacheId + "_" + remote.CacheId;
Analysis.IgnoreResult(await local.ShutdownAsync(), justification: "Okay to ignore shutdown status");
Analysis.IgnoreResult(await remote.ShutdownAsync(), justification: "Okay to ignore shutdown status");
return(eventing.StopFailure(new CacheConstructionFailure(cacheId, e)));
}
}
}