public Result <IReadOnlyList <ContentEvictionInfo> > GetEffectiveLastAccessTimes(
OperationContext context,
IReadOnlyList <ContentHashWithLastAccessTime> contentHashes)
{
Contract.RequiresNotNull(contentHashes);
Contract.Requires(contentHashes.Count > 0);
// This is required because the code inside could throw.
var effectiveLastAccessTimes = new List <ContentEvictionInfo>();
double logInverseMachineRisk = -Math.Log(_configuration.MachineRisk);
foreach (var contentHash in contentHashes)
{
DateTime lastAccessTime = contentHash.LastAccessTime;
int replicaCount = 1;
ReplicaRank rank = ReplicaRank.None;
var(localInfo, distributedEntry, isDesignatedLocation) = _contentResolver.GetContentInfo(context, contentHash.Hash);
// Getting a size from content directory information first.
long size = localInfo.Size;
if (distributedEntry != null)
{
// Use the latest last access time between LLS and local last access time
DateTime distributedLastAccessTime = distributedEntry.LastAccessTimeUtc.ToDateTime();
lastAccessTime = distributedLastAccessTime > lastAccessTime ? distributedLastAccessTime : lastAccessTime;
rank = GetReplicaRank(contentHash.Hash, distributedEntry, _contentResolver.LocalMachineId, _configuration, _now);
if (isDesignatedLocation)
{
rank = Combine(ReplicaRank.Designated, rank);
}
replicaCount = distributedEntry.Locations.Count;
if (size == 0)
{
size = distributedEntry.ContentSize;
}
}
var localAge = _now - contentHash.LastAccessTime;
var age = _now - lastAccessTime;
var effectiveAge = GetEffectiveLastAccessTime(_configuration, age, replicaCount, size, rank, logInverseMachineRisk);
var info = new ContentEvictionInfo(
contentHash.Hash,
age: age,
localAge: localAge,
effectiveAge: effectiveAge,
replicaCount: replicaCount,
size: size,
rank: rank);
effectiveLastAccessTimes.Add(info);
}
return(Result.Success <IReadOnlyList <ContentEvictionInfo> >(effectiveLastAccessTimes));
}
public Result <IReadOnlyList <ContentEvictionInfo> > GetEffectiveLastAccessTimes(
OperationContext context,
MachineId localMachineId,
IReadOnlyList <ContentHashWithLastAccessTime> contentHashes)
{
Contract.RequiresNotNull(contentHashes);
Contract.Requires(contentHashes.Count > 0);
// This is required because the code inside could throw.
var effectiveLastAccessTimes = new List <ContentEvictionInfo>();
double logInverseMachineRisk = -Math.Log(_configuration.MachineRisk);
foreach (var contentHash in contentHashes)
{
DateTime lastAccessTime = contentHash.LastAccessTime;
int replicaCount = 1;
bool isImportantReplica = false;
var(contentInfo, entry) = _contentResolver.GetContentInfo(context, contentHash.Hash);
// Getting a size from content directory information first.
long size = contentInfo.Size;
if (entry != null)
{
// Use the latest last access time between LLS and local last access time
DateTime distributedLastAccessTime = entry.LastAccessTimeUtc.ToDateTime();
lastAccessTime = distributedLastAccessTime > lastAccessTime ? distributedLastAccessTime : lastAccessTime;
isImportantReplica = IsImportantReplica(contentHash.Hash, entry, localMachineId, _configuration.DesiredReplicaRetention);
replicaCount = entry.Locations.Count;
if (size == 0)
{
size = entry.ContentSize;
}
}
var age = _clock.UtcNow - lastAccessTime;
var effectiveAge = GetEffectiveLastAccessTime(_configuration, age, replicaCount, size, isImportantReplica, logInverseMachineRisk);
var info = new ContentEvictionInfo(contentHash.Hash, age, effectiveAge, replicaCount, size, isImportantReplica);
effectiveLastAccessTimes.Add(info);
}
return(Result.Success <IReadOnlyList <ContentEvictionInfo> >(effectiveLastAccessTimes));
}
private static ContentHashWithLastAccessTimeAndReplicaCount ToContentHashListWithLastAccessTimeAndReplicaCount(ContentEvictionInfo contentHashInfo) => new ContentHashWithLastAccessTimeAndReplicaCount(contentHashInfo.ContentHash, DateTime.UtcNow - contentHashInfo.Age, contentHashInfo.ReplicaCount, safeToEvict: true, effectiveLastAccessTime: DateTime.UtcNow - contentHashInfo.EffectiveAge);