/// <summary>
/// Requests for the cache data using specified key.
/// </summary>
public CacheListener <TValue> Request(TKey key)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
// Remove last data or request first.
if (Listener != null)
{
Remove();
}
Key = key;
Listener = Cacher.Request(key);
if (Listener.IsFinished)
{
InvokeFinished(Listener.Value);
InvokeProgress(1f);
}
else
{
Listener.OnFinished += InvokeFinished;
Listener.OnProgress -= InvokeProgress;
}
return(Listener);
}
public void RemoveDelayed(CacheListener <TValue> listener, float delay = 2f)
{
if (listener == null)
{
throw new ArgumentNullException(nameof(listener));
}
var timer = CreateTimer();
timer.Limit = delay;
timer.OnFinished += () => Remove(listener);
timer.Start();
}
public void Remove(CacheListener <TValue> listener)
{
if (listener == null)
{
throw new ArgumentNullException(nameof(listener));
}
if (requests.TryGetValue(listener.Key, out CacheRequest <TValue> request))
{
RemoveListener(listener, request);
return;
}
}
/// <summary>
/// Creates a new listener that listens to the completion of this request.
/// </summary>
public CacheListener <T> Listen()
{
AssertNotDisposed();
var listener = new CacheListener <T>(Key);
if (IsComplete)
{
listener.SetFinished(Value);
}
Listeners.Add(listener);
return(listener);
}
/// <summary>
/// Removes the specified listener from the request.
/// </summary>
private void RemoveListener(CacheListener <TValue> listener, CacheRequest <TValue> request)
{
// Remove listener
request.Unlisten(listener);
// If no more reference remaining on the resource, then revoke the request.
if (request.Listeners.Count <= 0)
{
if (request.IsComplete)
{
DestroyData(request.Value);
}
request.Dispose();
requests.Remove(request.Key);
}
}
/// <summary>
/// Removes the last cached data fetched from the cacher using the last specified key.
/// </summary>
public void Remove()
{
if (Listener != null)
{
Listener.OnFinished -= InvokeFinished;
Listener.OnProgress -= InvokeProgress;
if (UseDelayedRemove)
{
Cacher.RemoveDelayed(Listener, RemoveDelay);
}
else
{
Cacher.Remove(Listener);
}
}
Key = null;
Listener = null;
}
/// <summary>
/// Attempts to remove the specified listener, if managed by this request.
/// </summary>
public bool Unlisten(CacheListener <T> listener)
{
AssertNotDisposed();
return(Listeners.Remove(listener));
}
