public IAsyncResult InvokeBegin(object instance, object[] inputs, AsyncCallback callback, object state)
{
string cacheKey = this.CreateCacheKey(inputs);
CachedOperationResult cachedItem = CacheServiceHelper.Current.Get <CachedOperationResult>(cacheKey);
CachingUserState cachingUserState = new CachingUserState
{
CacheItem = cachedItem,
CacheKey = cacheKey,
Callback = callback,
State = state
};
IAsyncResult originalAsyncResult;
if (cachedItem != null)
{
InvokerDelegate invoker = cachedItem.GetValue;
object[] notUsed;
originalAsyncResult = invoker.BeginInvoke(inputs, out notUsed, this.InvokerCallback, cachingUserState);
}
else
{
originalAsyncResult = _invoker.InvokeBegin(instance, inputs, this.InvokerCallback, cachingUserState);
}
return(new CachingAsyncResult(originalAsyncResult, cachingUserState));
}
public object InvokeEnd(object instance, out object[] outputs, IAsyncResult asyncResult)
{
CachingAsyncResult result = asyncResult as CachingAsyncResult;
CachingUserState state = result.CachingUserState;
if (state.CacheItem == null)
{
object data = _invoker.InvokeEnd(instance, out outputs, result.OriginalAsyncResult);
state.CacheItem = new CachedOperationResult {
Data = data, Outputs = outputs
};
CacheServiceHelper.Current.Add(state.CacheKey, state.CacheItem, TimeSpan.FromSeconds(_cacheDuration));
return(data);
}
else
{
InvokerDelegate invoker = ((AsyncResult)result.OriginalAsyncResult).AsyncDelegate as InvokerDelegate;
invoker.EndInvoke(out outputs, result.OriginalAsyncResult);
return(state.CacheItem.Data);
}
}
public CachingAsyncResult(IAsyncResult result, CachingUserState state)
{
_result = result;
_state = state;
}
private void InvokerCallback(IAsyncResult asyncResult)
{
CachingUserState state = asyncResult.AsyncState as CachingUserState;
state.Callback(new CachingAsyncResult(asyncResult, state));
}