private string GetData(string key)
{
if (_data.ContainsKey(key))
{
return(_data[key]);
}
// Since the keys are variable, cache a list of which ones are available
// to prevent unnecessary trips to the service.
if (null == _availableKeys)
{
_availableKeys = EC2InstanceMetadata.GetItems(_path);
}
if (_availableKeys.Contains(key))
{
_data[key] = EC2InstanceMetadata.GetData(_path + key);
return(_data[key]);
}
else
{
return(null);
}
}