/// <summary>
/// Map a counter over a buffer. This version will free the counter on close.
/// </summary>
/// <param name="buffer"> containing the counter. </param>
/// <param name="counterId"> identifier for the counter. </param>
/// <param name="countersManager"> to be called to free the counter on close. </param>
public AtomicCounter(IAtomicBuffer buffer, int counterId, CountersManager countersManager)
{
_buffer = buffer;
Id = counterId;
_countersManager = countersManager;
_offset = CountersReader.CounterOffset(counterId);
buffer.BoundsCheck(_offset, BitUtil.SIZE_OF_LONG);
}
/// <summary>
/// Construct a view of an existing counter.
/// </summary>
/// <param name="countersReader"> for getting access to the buffers. </param>
/// <param name="registrationId"> assigned by the driver for the counter or -1 if not known. </param>
/// <param name="counterId"> for the counter to be viewed. </param>
/// <exception cref="InvalidOperationException"> if the id has for the counter has not been allocated. </exception>
public ReadableCounter(CountersReader countersReader, long registrationId, int counterId)
{
if (countersReader.GetCounterState(counterId) != CountersReader.RECORD_ALLOCATED)
{
throw new InvalidOperationException("Counter id has not been allocated: " + counterId);
}
this.countersReader = countersReader;
this.counterId = counterId;
this.registrationId = registrationId;
valuesBuffer = countersReader.ValuesBuffer;
var counterOffset = CountersReader.CounterOffset(counterId);
valuesBuffer.BoundsCheck(counterOffset, BitUtil.SIZE_OF_LONG);
buffer = valuesBuffer.ByteArray;
addressOffset = counterOffset;
}
/// <summary>
/// Construct a view of an existing counter.
/// </summary>
/// <param name="countersReader"> for getting access to the buffers. </param>
/// <param name="registrationId"> assigned by the driver for the counter or <see cref="Adaptive.Aeron.Aeron.NULL_VALUE"/> if not known. </param>
/// <param name="counterId"> for the counter to be viewed. </param>
/// <exception cref="InvalidOperationException"> if the id has for the counter has not been allocated. </exception>
public ReadableCounter(CountersReader countersReader, long registrationId, int counterId)
{
var counterState = countersReader.GetCounterState(counterId);
if (counterState != CountersReader.RECORD_ALLOCATED)
{
throw new InvalidOperationException("Counter not allocated: id=" + counterId + " state=" + counterState);
}
_countersReader = countersReader;
_counterId = counterId;
_registrationId = registrationId;
_valuesBuffer = countersReader.ValuesBuffer;
var counterOffset = CountersReader.CounterOffset(counterId);
_valuesBuffer.BoundsCheck(counterOffset, BitUtil.SIZE_OF_LONG);
_buffer = _valuesBuffer.ByteArray;
_addressOffset = counterOffset;
}
