public CodeService(IDataEncoder dataEncoder, ICodesCollection codesCollection, IRepository repository, ICodeGenerator codeGenerator)
{
_dataEncoder = dataEncoder;
_codes = codesCollection;
_repository = repository;
_codeGenerator = codeGenerator;
}
/// <summary>
/// Generates and adds new unique codes to existingCodes.
/// This operation does a roll back if it cannot generate enough
/// unique keys in a certain amount of tries.
/// </summary>
/// <param name="existingCodes"></param>
/// <param name="codeLength"></param>
/// <param name="numberOfCodesToGenerate"></param>
/// <returns>True if generation succeeded, false - if it failed.</returns>
public bool TryAddNewUniqueCodes(ICodesCollection existingCodes, int codeLength, int numberOfCodesToGenerate, out List <Code> newCodesAdded)
{
var countOfAttempts = 0;
newCodesAdded = new List <Code>(numberOfCodesToGenerate);
while (newCodesAdded.Count < numberOfCodesToGenerate)
{
if (countOfAttempts > _maxFailedGenerationAttempts)
{
break;
}
var setOfCodes = GenerateCodes(codeLength, numberOfCodesToGenerate - newCodesAdded.Count);
for (var idx = 0; idx < setOfCodes.Length; ++idx)
{
if (existingCodes.Add(setOfCodes[idx]))
{
newCodesAdded.Add(setOfCodes[idx]);
}
}
countOfAttempts++;
}
if (newCodesAdded.Count == numberOfCodesToGenerate)
{
return(true);
}
existingCodes.RemoveRange(newCodesAdded);
newCodesAdded = new List <Code>();
return(false);
}