public static BigInteger GetNextNumber(NeoVersionedAppUser vau, NeoCounters counter)
{
BigInteger result = -1;
NeoCounter nc = NeoCounter.GetElement(vau, DOMAINAC, (int)counter); // Get persisted counter value
if (!NeoCounter.IsMissing(nc))
{
result = NeoCounter.GetCurrentNumber(nc);
}
return(result); // Return the current value for this counter
}
// Use case example: domain = user script hash, counter = NeoCounters.UserPointsCounter
// TakeNextNumber semantics: return the current number and then advance the counter ...like at the grocery store
public static BigInteger TakeNextNumber(NeoVersionedAppUser vau, byte[] domain, NeoCounters counter)
{
NeoCounter nc = NeoCounter.GetElement(vau, domain, (int)counter); // Get persisted counter value
if (NeoTrace.INFO)
{
NeoCounter.LogExt("TakeNextNumber", nc);
}
if (NeoCounter.IsMissing(nc)) // Create persist the new counter entity
{
if (NeoTrace.INFO)
{
NeoCounter.LogExt("TakeNextNumber.domain and counter is missing", nc);
}
nc = NeoCounter.New(); // Create a new counter entity
if (NeoTrace.INFO)
{
NeoCounter.LogExt("TakeNextNumber.putnew", nc);
}
NeoCounter.PutElement(nc, vau, domain, (int)counter); // Persist the new counter entity with a value of zero
}
if (NeoTrace.INFO)
{
NeoCounter.LogExt("TakeNextNumber.exists", nc);
}
BigInteger currentNextNumber = NeoCounter.GetCurrentNumber(nc);
if (NeoTrace.INFO)
{
NeoTraceRuntime.TraceRuntime("currentNextNumber", currentNextNumber);
}
BigInteger newNextNumber = currentNextNumber + 1;
if (NeoTrace.INFO)
{
NeoTraceRuntime.TraceRuntime("nextNumber", newNextNumber);
}
NeoCounter.SetCurrentNumber(nc, newNextNumber);
if (NeoTrace.INFO)
{
NeoCounter.LogExt("TakeNextNumber.putincr", nc);
}
NeoCounter.PutElement(nc, vau, domain, (int)counter); // Persist the new counter
return(currentNextNumber);
}
public static BigInteger TakeNextNumber(NeoVersionedAppUser vau, NeoCounters counter)
{
NeoCounter nc = NeoCounter.GetElement(vau, DOMAINAC, (int)counter); // Get persisted counter value
if (NeoTrace.INFO)
{
NeoCounter.LogExt("TakeNextNumber", nc);
}
if (NeoCounter.IsMissing(nc))
{
nc = NeoCounter.New(); // Create a new counter value
if (NeoTrace.INFO)
{
NeoCounter.LogExt("TakeNextNumber.putnew", nc);
}
NeoCounter.PutElement(nc, vau, DOMAINAC, (int)counter); // Persist the new counter
}
else // Get and increment counter value by 1
{
BigInteger newNumber = NeoCounter.GetCurrentNumber(nc);
if (NeoTrace.INFO)
{
NeoTraceRuntime.TraceRuntime("newNumber", newNumber);
}
newNumber = newNumber + 1;
if (NeoTrace.INFO)
{
NeoTraceRuntime.TraceRuntime("newNumber", newNumber);
}
NeoCounter.SetCurrentNumber(nc, newNumber);
if (NeoTrace.INFO)
{
NeoCounter.LogExt("TakeNextNumber.putincr", nc);
}
NeoCounter.PutElement(nc, vau, DOMAINAC, (int)counter); // Persist the new counter
}
return(NeoCounter.GetCurrentNumber(nc));
}
// Use case example: domain = user script hash, counter = NeoCounters.UserPointsCounter
public static BigInteger GiveBackLastNumber(NeoVersionedAppUser vau, byte[] domain, NeoCounters counter)
{
NeoCounter nc = NeoCounter.GetElement(vau, domain, (int)counter); // Get persisted counter value
if (NeoTrace.INFO)
{
NeoCounter.LogExt("GiveBackLastNumber", nc);
}
if (NeoCounter.IsMissing(nc))
{
nc = NeoCounter.New(); // Create a new counter value
}
else // Get and decrement counter value by 1
{
BigInteger currentNumber = NeoCounter.GetCurrentNumber(nc);
if (NeoTrace.INFO)
{
NeoTraceRuntime.TraceRuntime("currentNumber", currentNumber);
}
currentNumber = currentNumber - 1;
if (NeoTrace.INFO)
{
NeoTraceRuntime.TraceRuntime("currentNumber", currentNumber);
}
NeoCounter.SetCurrentNumber(nc, currentNumber);
if (NeoTrace.INFO)
{
NeoCounter.LogExt("GiveBackLastNumber", nc);
}
NeoCounter.PutElement(nc, vau, domain, (int)counter); // Persist the incremented current value of the counter
if (NeoTrace.INFO)
{
NeoCounter.LogExt("GiveBackLastNumber", nc);
}
}
return(NeoCounter.GetCurrentNumber(nc));
}