/// <summary>
/// Get the cached entry for the given tlog set, if the table is out of date it is removed from the cache
/// </summary>
/// <param name="tLogRootingMarker">The rooting marker for the set of tlogs</param>
/// <returns>The cached table entry</returns>
internal static DependencyTableCacheEntry GetCachedEntry(string tLogRootingMarker)
{
if (DependencyTable.ContainsKey(tLogRootingMarker))
{
DependencyTableCacheEntry cacheEntry = DependencyTable[tLogRootingMarker];
if (DependencyTableIsUpToDate(cacheEntry))
{
return(cacheEntry);
}
else
{
// Remove the cached entry from memory
DependencyTable.Remove(tLogRootingMarker);
}
}
// Either there was no cache entry, or it was out of date and was removed
return(null);
}
/// <summary>
/// Determine if a cache entry is up to date
/// </summary>
/// <param name="dependencyTable">The cache entry to check</param>
/// <returns>true if up to date</returns>
private static bool DependencyTableIsUpToDate(DependencyTableCacheEntry dependencyTable)
{
DateTime tableTime = dependencyTable.TableTime;
foreach (ITaskItem tlogFile in dependencyTable.TlogFiles)
{
string tlogFilename = FileUtilities.NormalizePath(tlogFile.ItemSpec);
DateTime lastWriteTime = NativeMethodsShared.GetLastWriteFileUtcTime(tlogFilename);
if (lastWriteTime > tableTime)
{
// one of the tlog files is newer than the table, so return false
return(false);
}
}
return(true);
}