/// <summary>
/// Retrieve a Package for usage. This method will create the Package if it does not exist yet or open it if it exists
/// </summary>
/// <param name="packagePath">Path to the Package to initialize</param>
private async Task <ZipArchive> RetrievePackageAsync(string packagePath)
{
var semaphore = LockingDictionary.GetOrAdd(packagePath, new SemaphoreSlim(1));
try
{
await semaphore.WaitAsync();
if (PackageDictionary.ContainsKey(packagePath))
{
return(PackageDictionary[packagePath]);
}
if (!File.Exists(packagePath))
{
var createdZip = new ZipArchive(File.Open(packagePath, FileMode.OpenOrCreate), ZipArchiveMode.Create);
createdZip.Dispose();
}
var tmpPackage = new ZipArchive(File.Open(packagePath, FileMode.OpenOrCreate), ZipArchiveMode.Update);
PackageDictionary.Add(packagePath, tmpPackage);
return(tmpPackage);
}
finally
{
semaphore.Release();
}
}
/// <summary>
/// Flush (Dispose) the <see cref="ZipArchive"/> in <see cref="PackageDictionary"/> and reconnect to it
/// to force data to be persisted to disk after an operation.
/// Flush will only occur if the pacakge is in the <see cref="PackageDictionary"/> and <see cref="AutoFlush"/> is set to true.
/// <remarks>
/// This method does not lock use the Semaphore from the <see cref="LockingDictionary"/> so it must be called when the archive is already locked
/// </remarks>
/// </summary>
/// <param name="packagePath">Package path used to retrieve it from the Dictionary</param>
private void AutoFlushPackage(string packagePath)
{
if (!AutoFlush ||
!PackageDictionary.ContainsKey(packagePath))
{
return;
}
PackageDictionary[packagePath].Dispose();
PackageDictionary[packagePath] = new ZipArchive(File.Open(packagePath, FileMode.OpenOrCreate), ZipArchiveMode.Update);
}