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* Fixed the ExpiringCache collection to remove an ambiguity of whether to use local timezone expiration dates or UTC expiration dates. Expiration time is now passed in as the number of seconds relative to the current time

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* Minor performance improvement in ExpiringCache to avoid instantiating a List<> every time the cache purge timer runs

git-svn-id: http://libopenmetaverse.googlecode.com/svn/libopenmetaverse/trunk@3421 52acb1d6-8a22-11de-b505-999d5b087335
This commit is contained in:
John Hurliman
2010-08-13 23:06:35 +00:00
parent 3d95a4a880
commit dfd53af1f3
2 changed files with 120 additions and 30 deletions
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50
OpenMetaverseTypes/ExpiringCache.cs
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@@ -103,7 +103,7 @@ namespace OpenMetaverse
#region Public methods
public bool Add(TKey key, TValue value, DateTime expiration)
public bool Add(TKey key, TValue value, double expirationSeconds)
{
if (!Monitor.TryEnter(syncRoot, MAX_LOCK_WAIT))
throw new ApplicationException("Lock could not be acquired after " + MAX_LOCK_WAIT + "ms");
@@ -116,7 +116,7 @@ namespace OpenMetaverse
}
else
{
TimedCacheKey<TKey> internalKey = new TimedCacheKey<TKey>(key, expiration);
TimedCacheKey<TKey> internalKey = new TimedCacheKey<TKey>(key, DateTime.UtcNow + TimeSpan.FromSeconds(expirationSeconds));
timedStorage.Add(internalKey, value);
timedStorageIndex.Add(key, internalKey);
return true;
@@ -147,7 +147,7 @@ namespace OpenMetaverse
finally { Monitor.Exit(syncRoot); }
}
public bool AddOrUpdate(TKey key, TValue value, DateTime expiration)
public bool AddOrUpdate(TKey key, TValue value, double expirationSeconds)
{
if (!Monitor.TryEnter(syncRoot, MAX_LOCK_WAIT))
throw new ApplicationException("Lock could not be acquired after " + MAX_LOCK_WAIT + "ms");
@@ -155,12 +155,12 @@ namespace OpenMetaverse
{
if (Contains(key))
{
Update(key, value, expiration);
Update(key, value, expirationSeconds);
return false;
}
else
{
Add(key, value, expiration);
Add(key, value, expirationSeconds);
return true;
}
}
@@ -245,22 +245,6 @@ namespace OpenMetaverse
}
}
public TValue this[TKey key, DateTime expiration]
{
set
{
AddOrUpdate(key, value, expiration);
}
}
public TValue this[TKey key, TimeSpan slidingExpiration]
{
set
{
AddOrUpdate(key, value, slidingExpiration);
}
}
public bool Remove(TKey key)
{
if (!Monitor.TryEnter(syncRoot, MAX_LOCK_WAIT))
@@ -327,7 +311,7 @@ namespace OpenMetaverse
finally { Monitor.Exit(syncRoot); }
}
public bool Update(TKey key, TValue value, DateTime expiration)
public bool Update(TKey key, TValue value, double expirationSeconds)
{
if (!Monitor.TryEnter(syncRoot, MAX_LOCK_WAIT))
throw new ApplicationException("Lock could not be acquired after " + MAX_LOCK_WAIT + "ms");
@@ -343,7 +327,7 @@ namespace OpenMetaverse
return false;
}
TimedCacheKey<TKey> internalKey = new TimedCacheKey<TKey>(key, expiration);
TimedCacheKey<TKey> internalKey = new TimedCacheKey<TKey>(key, DateTime.UtcNow + TimeSpan.FromSeconds(expirationSeconds));
timedStorage.Add(internalKey, value);
timedStorageIndex.Add(key, internalKey);
return true;
@@ -414,6 +398,9 @@ namespace OpenMetaverse
// happening on the cache
if (!Monitor.TryEnter(isPurging))
return;
DateTime signalTime = DateTime.UtcNow;
try
{
// If we fail to acquire a lock on the synchronization root after MAX_LOCK_WAIT, skip this purge cycle
@@ -421,14 +408,14 @@ namespace OpenMetaverse
return;
try
{
List<object> expiredItems = new List<object>();
Lazy<List<object>> expiredItems = new Lazy<List<object>>();
foreach (TimedCacheKey<TKey> timedKey in timedStorage.Keys)
{
if (timedKey.ExpirationDate < e.SignalTime)
if (timedKey.ExpirationDate < signalTime)
{
// Mark the object for purge
expiredItems.Add(timedKey.Key);
expiredItems.Value.Add(timedKey.Key);
}
else
{
@@ -436,11 +423,14 @@ namespace OpenMetaverse
}
}
foreach (TKey key in expiredItems)
if (expiredItems.IsValueCreated)
{
TimedCacheKey<TKey> timedKey = timedStorageIndex[key];
timedStorageIndex.Remove(timedKey.Key);
timedStorage.Remove(timedKey);
foreach (TKey key in expiredItems.Value)
{
TimedCacheKey<TKey> timedKey = timedStorageIndex[key];
timedStorageIndex.Remove(timedKey.Key);
timedStorage.Remove(timedKey);
}
}
}
finally { Monitor.Exit(syncRoot); }