/// <summary>
/// Looks for a query parameter value in a <see cref="Uri"/>.
/// </summary>
/// <param name="uri">
/// The <seealso cref="Uri"/> containing the query.
/// </param>
/// <param name="key">
/// A query property name to look for.
/// </param>
/// <returns>
/// A <seealso cref="BoolValue{T}"/> indicating whether the specified value
/// was present in the query. On success this object will also carry the
/// requested query property value (<seealso cref="BoolValue{T}.Value"/>).
/// </returns>
public static BoolValue <string> TryGetQueryValue(this Uri uri, string key)
{
lock (s_cachedQueries)
{
if (!s_cachedQueries.TryGetValue(uri, out var dict))
{
dict = new Dictionary <string, string>();
var kvps = uri.Query.Split(new[] { '&' }, StringSplitOptions.RemoveEmptyEntries).ToArray();
for (var i = 0; i < kvps.Length; i++)
{
var kvp = kvps[i].Split('=');
dict[kvp[0].TrimStart('?')] = kvp[1];
}
s_cachedQueries.Add(uri, dict);
}
return(dict.TryGetValue(key, out var value)
? BoolValue <string> .Success(value)
: BoolValue <string> .Fail(""));
}
}
public override async Task <BoolValue <T> > TryGetAsync(string key = null)
{
var isLoaded = await base.TryGetAsync(key);
if (isLoaded)
{
return(isLoaded);
}
var path = Path.Combine(_directory.FullName, $"{key}{_fileSuffix}");
if (!File.Exists(path))
{
return(BoolValue <T> .Fail());
}
var json = File.ReadAllText(path);
var cachedItem = json.FromJson <T>();
await base.AddAsync(cachedItem.Key, cachedItem.Value, true, cachedItem.Expires);
return(BoolValue <T> .Success(cachedItem.Value));
}
/// <inheritdoc/>
public virtual Task <BoolValue <T> > TryGetAsync(string key = null)
{
key ??= DefaultKey;
if (string.IsNullOrWhiteSpace(key))
{
throw new ArgumentNullException(nameof(key));
}
if (string.IsNullOrWhiteSpace(key))
{
throw new ArgumentNullException(nameof(key));
}
lock (_syncRoot)
{
if (_items.TryGetValue(key, out CachedItem <T> item) && !item.IsExpired)
{
return(Task.FromResult(BoolValue <T> .Success(item.Value)));
}
}
return(Task.FromResult(BoolValue <T> .Fail()));
}
