/// <summary>
/// Get an access to the buffer.
/// </summary>
/// <param name="usage">Specifies the access usage.</param>
/// <returns>An usage instance.</returns>
public ObjectUsage <T> Get(UsageType usage)
{
switch (usage)
{
case UsageType.Write:
lock (pBuffer)
{
// - Find the free buffer for write
while (pBuffer[pWritePointer]?.Usage == UsageType.Read || pWritePointer == pFreePointer)
{
pWritePointer = (pWritePointer + 1) % 3;
}
}
// - If buffer is null instance it and set it on Write
if (pBuffer[pWritePointer] == null)
{
ObjectUsage <T> obj = new ObjectUsage <T>
{
Usage = UsageType.Write
};
obj.Action = () => Close(obj);
pBuffer[pWritePointer] = obj;
}
else
{
pBuffer[pWritePointer].Usage = UsageType.Write;
}
return(pBuffer[pWritePointer]);
case UsageType.Read:
if (pFreePointer < 0)
{
return(null);
}
lock (pBuffer)
{
pReadPointer = pFreePointer;
pBuffer[pReadPointer].Usage = UsageType.Read;
}
return(pBuffer[pReadPointer]);
}
return(null);
}
/// <summary>
/// Called on usage disposition
/// </summary>
private void Close(ObjectUsage <T> obj)
{
switch (obj.Usage)
{
case UsageType.Read:
lock (pBuffer)
pBuffer[pReadPointer].Usage = UsageType.None;
break;
case UsageType.Write:
lock (pBuffer)
{
pBuffer[pWritePointer].Usage = UsageType.None;
pFreePointer = pWritePointer;
}
break;
}
}
