org.jctools.queues.atomic.SequencedAtomicReferenceArrayQueue Maven / Gradle / Ivy
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jctools.queues.atomic;
import java.util.concurrent.atomic.AtomicLongArray;
abstract class SequencedAtomicReferenceArrayQueue extends
AtomicReferenceArrayQueue
{
protected final AtomicLongArray sequenceBuffer;
public SequencedAtomicReferenceArrayQueue(int capacity)
{
super(capacity);
int actualCapacity = this.mask + 1;
// pad data on either end with some empty slots.
sequenceBuffer = new AtomicLongArray(actualCapacity);
for (int i = 0; i < actualCapacity; i++)
{
soSequence(sequenceBuffer, i, i);
}
}
protected final long calcSequenceOffset(long index)
{
return calcSequenceOffset(index, mask);
}
protected static int calcSequenceOffset(long index, int mask)
{
return (int) index & mask;
}
protected final void soSequence(AtomicLongArray buffer, int offset, long e)
{
buffer.lazySet(offset, e);
}
protected final long lvSequence(AtomicLongArray buffer, int offset)
{
return buffer.get(offset);
}
}