/// <summary>
/// Fetches help on the function from R asynchronously.
/// </summary>
private async Task <IFunctionInfo> GetFunctionInfoFromEngineAsync(string functionName, string packageName)
{
if (!IsValidFunctionName(functionName))
{
return(null);
}
TryGetCachedFunctionInfo(functionName, ref packageName);
packageName = packageName ?? await _host.GetFunctionPackageNameAsync(functionName);
if (string.IsNullOrEmpty(packageName))
{
return(null);
}
var rdData = await _functionRdDataProvider.GetFunctionRdDataAsync(functionName, packageName);
if (!string.IsNullOrEmpty(rdData))
{
// If package is found update data in the index
UpdateIndex(functionName, packageName, rdData);
return(TryGetCachedFunctionInfo(functionName, ref packageName));
}
return(null);
}
/// <summary>
/// Fetches help on the function from R asynchronously.
/// When function data is obtained, parsed and the function
/// index is updated, method invokes <see cref="infoReadyCallback"/>
/// callback passing the specified parameter. Callback method can now
/// fetch function information from the index.
/// </summary>
private async Task <string> GetFunctionInfoFromEngineAsync(string functionName, string packageName, Action <object, string> infoReadyCallback = null, object parameter = null)
{
packageName = packageName ?? await _host.GetFunctionPackageNameAsync(functionName);
if (string.IsNullOrEmpty(packageName))
{
// Even if nothing is found, still notify the callback
if (infoReadyCallback != null)
{
_coreShell.DispatchOnUIThread(() => {
infoReadyCallback(null, null);
});
}
return(packageName);
}
if (infoReadyCallback == null)
{
// regular async call
var rdData = await _functionRdDataProvider.GetFunctionRdDataAsync(functionName, packageName);
if (!string.IsNullOrEmpty(rdData))
{
// If package is found update data in the index
UpdateIndex(functionName, packageName, rdData);
}
return(packageName);
}
_functionRdDataProvider.GetFunctionRdDataAsync(functionName, packageName,
rdData => {
if (!string.IsNullOrEmpty(packageName) && !string.IsNullOrEmpty(rdData))
{
// If package is found update data in the index
UpdateIndex(functionName, packageName, rdData);
}
_coreShell.DispatchOnUIThread(() => infoReadyCallback(parameter, packageName));
});
return(packageName);
}