org.jctools.queues.LinkedArrayQueueUtil Maven / Gradle / Ivy
package org.jctools.queues;
import org.jctools.util.InternalAPI;
import static org.jctools.util.UnsafeRefArrayAccess.REF_ARRAY_BASE;
import static org.jctools.util.UnsafeRefArrayAccess.REF_ELEMENT_SHIFT;
/**
* This is used for method substitution in the LinkedArray classes code generation.
*/
@InternalAPI
public final class LinkedArrayQueueUtil
{
public static int length(Object[] buf)
{
return buf.length;
}
/**
* This method assumes index is actually (index << 1) because lower bit is
* used for resize. This is compensated for by reducing the element shift.
* The computation is constant folded, so there's no cost.
*/
public static long modifiedCalcCircularRefElementOffset(long index, long mask)
{
return REF_ARRAY_BASE + ((index & mask) << (REF_ELEMENT_SHIFT - 1));
}
public static long nextArrayOffset(Object[] curr)
{
return REF_ARRAY_BASE + ((long) (length(curr) - 1) << REF_ELEMENT_SHIFT);
}
}