/// <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 (buffer)
{
// - Find the free buffer for write
while (buffer[writePointer]?.Usage == UsageType.Read || writePointer == freePointer)
{
writePointer = (writePointer + 1) % 3;
}
}
// - If buffer is null instance it and set it on Write
if (buffer[writePointer] == null)
{
ObjectUsage <T> obj = new ObjectUsage <T>
{
Usage = UsageType.Write
};
obj.Action = () => Close(obj);
buffer[writePointer] = obj;
}
else
{
buffer[writePointer].Usage = UsageType.Write;
}
return(buffer[writePointer]);
case UsageType.Read:
if (freePointer < 0)
{
return(null);
}
lock (buffer)
{
readPointer = freePointer;
buffer[readPointer].Usage = UsageType.Read;
}
return(buffer[readPointer]);
}
return(null);
}
private void Close(ObjectUsage <T> obj)
{
switch (obj.Usage)
{
case UsageType.Read:
lock (buffer)
buffer[readPointer].Usage = UsageType.None;
break;
case UsageType.Write:
lock (buffer)
{
buffer[writePointer].Usage = UsageType.None;
freePointer = writePointer;
}
break;
}
}