/// <summary>
/// Locks a resource
/// </summary>
/// <param name="category">Category</param>
/// <param name="id">Id of the resource</param>
/// <param name="userId">Id of the user who acquires the lock</param>
/// <param name="expireDate">Date at which the lock expires</param>
/// <returns>Task</returns>
public async Task LockResource(string category, string id, string userId, DateTimeOffset expireDate)
{
LockEntry existingLock = await GetResourceLockEntry(category, id);
LockEntry lockEntry = new LockEntry
{
Category = category,
ResourceId = id,
UserId = userId,
ExpireDate = expireDate
};
if(existingLock != null)
{
lockEntry.Id = existingLock.Id;
await _LockCollection.ReplaceOneAsync(l => l.Id == existingLock.Id, lockEntry);
}
else
{
lockEntry.Id = Guid.NewGuid().ToString();
await _LockCollection.InsertOneAsync(lockEntry);
}
}
/// <summary>
/// Returns the person who has a lock on a resource, "" if no valid lock exists
/// </summary>
/// <param name="category">Category</param>
/// <param name="id">Id of the resource</param>
/// <returns>Id of the user who has a lock, "" if no lock exists</returns>
public async Task <LockEntry> GetResourceLockEntry(string category, string id)
{
LockEntry existingLock = await _LockCollection.AsQueryable().Where(l => l.Category == category && l.ResourceId == id).FirstOrDefaultAsync();
return(existingLock);
}