/// <summary>
/// Construct a new broadcast receiver based on an underlying <seealso cref="IAtomicBuffer"/>.
/// The underlying buffer must a power of 2 in size plus sufficient space
/// for the <seealso cref="BroadcastBufferDescriptor.TrailerLength"/>.
/// </summary>
/// <param name="buffer"> via which messages will be exchanged. </param>
/// <exception cref="InvalidOperationException"> if the buffer capacity is not a power of 2
/// plus <seealso cref="BroadcastBufferDescriptor.TrailerLength"/> in capacity. </exception>
public BroadcastReceiver(IAtomicBuffer buffer)
{
_buffer = buffer;
_capacity = buffer.Capacity - BroadcastBufferDescriptor.TrailerLength;
BroadcastBufferDescriptor.CheckCapacity(_capacity);
buffer.VerifyAlignment();
_tailIntentCounterIndex = _capacity + BroadcastBufferDescriptor.TailIntentCounterOffset;
_tailCounterIndex = _capacity + BroadcastBufferDescriptor.TailCounterOffset;
_latestCounterIndex = _capacity + BroadcastBufferDescriptor.LatestCounterOffset;
}
/// <summary>
/// Construct a new broadcast receiver based on an underlying <seealso cref="IAtomicBuffer"/>.
/// The underlying buffer must a power of 2 in size plus sufficient space
/// for the <seealso cref="BroadcastBufferDescriptor.TrailerLength"/>.
/// </summary>
/// <param name="buffer"> via which messages will be exchanged. </param>
/// <exception cref="InvalidOperationException"> if the buffer capacity is not a power of 2
/// plus <seealso cref="BroadcastBufferDescriptor.TrailerLength"/> in capacity. </exception>
public BroadcastReceiver(IAtomicBuffer buffer)
{
_buffer = buffer;
_capacity = buffer.Capacity - BroadcastBufferDescriptor.TrailerLength;
BroadcastBufferDescriptor.CheckCapacity(_capacity);
buffer.VerifyAlignment();
_tailIntentCounterIndex = _capacity + BroadcastBufferDescriptor.TailIntentCounterOffset;
_tailCounterIndex = _capacity + BroadcastBufferDescriptor.TailCounterOffset;
_latestCounterIndex = _capacity + BroadcastBufferDescriptor.LatestCounterOffset;
_cursor = _nextRecord = buffer.GetLongVolatile(_latestCounterIndex);
_recordOffset = (int)_cursor & (_capacity - 1);
}
