/// <summary>
/// Gets the <see cref="CommandCacheItem"/> from the cache.
/// Returns <c>null</c> if the corresponding item does not exist.
/// </summary>
/// <param name="identity">The identity for retrieving the cache.</param>
/// <returns>The <see cref="CommandCacheItem"/> or <c>null</c>.</returns>
public static CommandCacheItem Get(CommandIdentity identity)
{
try
{
Lock.EnterReadLock();
CommandCacheItem cache;
// we suppose in more situations G1 is enough for use,
// so search from G1 before G2 will be more quickly
if (!Generation1.TryGetValue(identity, out cache))
{
if (!_generation2Enabled)
{
return(null);
}
if (!_generation2.TryGetValue(identity, out cache))
{
return(null);
}
}
Interlocked.Increment(ref cache.Reused);
return(cache);
}
finally
{
Lock.ExitReadLock();
}
}
/// <summary>
/// Sets the <see cref="CommandCacheItem"/> in the cache.
/// </summary>
/// <param name="identity">The identity for retrieving the cache.</param>
/// <param name="cacheItem">The <see cref="CommandCacheItem"/> to set.</param>
public static void Set(CommandIdentity identity, CommandCacheItem cacheItem)
{
try
{
Lock.EnterWriteLock();
if (Generation1.Count >= Generation1Threshold)
{
CollectGeneration1();
}
Generation1[identity] = cacheItem;
}
finally
{
Lock.ExitWriteLock();
}
}