public async Task <long> GetVersion(Guid applicationId, string environmentName, string privateKey)
{
Guard.IsTrue(await hasValidAccessKey.ToRead(applicationId, privateKey), "Invalid access key");
var environments = unitOfWork.Repository <ApplicationEnvironment, Guid>();
var spec = ApplicationEnvironment.WithApplication(applicationId).And(ApplicationEnvironment.WithName(environmentName));
var environment = await environments.FirstOrDefaultAsync(spec);
Guard.IsNotNull(environment, "Invalid environment name.");
return(environment.GetVersion());
}
