// 
// Decompiled by Procyon v0.6.0
// 

package io.netty.util.internal.shaded.org.jctools.queues.atomic;

import io.netty.util.internal.shaded.org.jctools.queues.MessagePassingQueueUtil;
import java.util.concurrent.atomic.AtomicReferenceArray;
import io.netty.util.internal.shaded.org.jctools.queues.MessagePassingQueue;
import java.util.concurrent.atomic.AtomicLongArray;
import io.netty.util.internal.shaded.org.jctools.util.RangeUtil;

public class MpmcAtomicArrayQueue<E> extends MpmcAtomicArrayQueueL3Pad<E>
{
    public static final int MAX_LOOK_AHEAD_STEP;
    private final int lookAheadStep;
    
    public MpmcAtomicArrayQueue(final int capacity) {
        super(RangeUtil.checkGreaterThanOrEqual(capacity, 2, "capacity"));
        this.lookAheadStep = Math.max(2, Math.min(this.capacity() / 4, MpmcAtomicArrayQueue.MAX_LOOK_AHEAD_STEP));
    }
    
    @Override
    public boolean offer(final E e) {
        if (null == e) {
            throw new NullPointerException();
        }
        final int mask = this.mask;
        final long capacity = mask + 1;
        final AtomicLongArray sBuffer = this.sequenceBuffer;
        long cIndex = Long.MIN_VALUE;
        long seq;
        long pIndex;
        int seqOffset;
        do {
            pIndex = this.lvProducerIndex();
            seqOffset = AtomicQueueUtil.calcCircularLongElementOffset(pIndex, mask);
            seq = AtomicQueueUtil.lvLongElement(sBuffer, seqOffset);
            if (seq < pIndex) {
                if (pIndex - capacity >= cIndex && pIndex - capacity >= (cIndex = this.lvConsumerIndex())) {
                    return false;
                }
                seq = pIndex + 1L;
            }
        } while (seq > pIndex || !this.casProducerIndex(pIndex, pIndex + 1L));
        AtomicQueueUtil.spRefElement(this.buffer, AtomicQueueUtil.calcCircularRefElementOffset(pIndex, mask), e);
        AtomicQueueUtil.soLongElement(sBuffer, seqOffset, pIndex + 1L);
        return true;
    }
    
    @Override
    public E poll() {
        final AtomicLongArray sBuffer = this.sequenceBuffer;
        final int mask = this.mask;
        long pIndex = -1L;
        long seq;
        long expectedSeq;
        long cIndex;
        int seqOffset;
        do {
            cIndex = this.lvConsumerIndex();
            seqOffset = AtomicQueueUtil.calcCircularLongElementOffset(cIndex, mask);
            seq = AtomicQueueUtil.lvLongElement(sBuffer, seqOffset);
            expectedSeq = cIndex + 1L;
            if (seq < expectedSeq) {
                if (cIndex >= pIndex && cIndex == (pIndex = this.lvProducerIndex())) {
                    return null;
                }
                seq = expectedSeq + 1L;
            }
        } while (seq > expectedSeq || !this.casConsumerIndex(cIndex, cIndex + 1L));
        final int offset = AtomicQueueUtil.calcCircularRefElementOffset(cIndex, mask);
        final E e = AtomicQueueUtil.lpRefElement(this.buffer, offset);
        AtomicQueueUtil.spRefElement(this.buffer, offset, (E)null);
        AtomicQueueUtil.soLongElement(sBuffer, seqOffset, cIndex + mask + 1L);
        return e;
    }
    
    @Override
    public E peek() {
        final AtomicLongArray sBuffer = this.sequenceBuffer;
        final int mask = this.mask;
        long pIndex = -1L;
        while (true) {
            final long cIndex = this.lvConsumerIndex();
            final int seqOffset = AtomicQueueUtil.calcCircularLongElementOffset(cIndex, mask);
            final long seq = AtomicQueueUtil.lvLongElement(sBuffer, seqOffset);
            final long expectedSeq = cIndex + 1L;
            if (seq < expectedSeq) {
                if (cIndex >= pIndex && cIndex == (pIndex = this.lvProducerIndex())) {
                    return null;
                }
                continue;
            }
            else {
                if (seq != expectedSeq) {
                    continue;
                }
                final int offset = AtomicQueueUtil.calcCircularRefElementOffset(cIndex, mask);
                final E e = AtomicQueueUtil.lvRefElement(this.buffer, offset);
                if (this.lvConsumerIndex() == cIndex) {
                    return e;
                }
                continue;
            }
        }
    }
    
    @Override
    public boolean relaxedOffer(final E e) {
        if (null == e) {
            throw new NullPointerException();
        }
        final int mask = this.mask;
        final AtomicLongArray sBuffer = this.sequenceBuffer;
        long seq;
        long pIndex;
        int seqOffset;
        do {
            pIndex = this.lvProducerIndex();
            seqOffset = AtomicQueueUtil.calcCircularLongElementOffset(pIndex, mask);
            seq = AtomicQueueUtil.lvLongElement(sBuffer, seqOffset);
            if (seq < pIndex) {
                return false;
            }
        } while (seq > pIndex || !this.casProducerIndex(pIndex, pIndex + 1L));
        AtomicQueueUtil.spRefElement(this.buffer, AtomicQueueUtil.calcCircularRefElementOffset(pIndex, mask), e);
        AtomicQueueUtil.soLongElement(sBuffer, seqOffset, pIndex + 1L);
        return true;
    }
    
    @Override
    public E relaxedPoll() {
        final AtomicLongArray sBuffer = this.sequenceBuffer;
        final int mask = this.mask;
        long seq;
        long expectedSeq;
        long cIndex;
        int seqOffset;
        do {
            cIndex = this.lvConsumerIndex();
            seqOffset = AtomicQueueUtil.calcCircularLongElementOffset(cIndex, mask);
            seq = AtomicQueueUtil.lvLongElement(sBuffer, seqOffset);
            expectedSeq = cIndex + 1L;
            if (seq < expectedSeq) {
                return null;
            }
        } while (seq > expectedSeq || !this.casConsumerIndex(cIndex, cIndex + 1L));
        final int offset = AtomicQueueUtil.calcCircularRefElementOffset(cIndex, mask);
        final E e = AtomicQueueUtil.lpRefElement(this.buffer, offset);
        AtomicQueueUtil.spRefElement(this.buffer, offset, (E)null);
        AtomicQueueUtil.soLongElement(sBuffer, seqOffset, cIndex + mask + 1L);
        return e;
    }
    
    @Override
    public E relaxedPeek() {
        final AtomicLongArray sBuffer = this.sequenceBuffer;
        final int mask = this.mask;
        while (true) {
            final long cIndex = this.lvConsumerIndex();
            final int seqOffset = AtomicQueueUtil.calcCircularLongElementOffset(cIndex, mask);
            final long seq = AtomicQueueUtil.lvLongElement(sBuffer, seqOffset);
            final long expectedSeq = cIndex + 1L;
            if (seq < expectedSeq) {
                return null;
            }
            if (seq != expectedSeq) {
                continue;
            }
            final int offset = AtomicQueueUtil.calcCircularRefElementOffset(cIndex, mask);
            final E e = AtomicQueueUtil.lvRefElement(this.buffer, offset);
            if (this.lvConsumerIndex() == cIndex) {
                return e;
            }
        }
    }
    
    @Override
    public int drain(final MessagePassingQueue.Consumer<E> c, final int limit) {
        if (null == c) {
            throw new IllegalArgumentException("c is null");
        }
        if (limit < 0) {
            throw new IllegalArgumentException("limit is negative: " + limit);
        }
        if (limit == 0) {
            return 0;
        }
        final AtomicLongArray sBuffer = this.sequenceBuffer;
        final int mask = this.mask;
        final AtomicReferenceArray<E> buffer = this.buffer;
        final int maxLookAheadStep = Math.min(this.lookAheadStep, limit);
        int consumed = 0;
        while (consumed < limit) {
            final int remaining = limit - consumed;
            final int lookAheadStep = Math.min(remaining, maxLookAheadStep);
            final long cIndex = this.lvConsumerIndex();
            final long lookAheadIndex = cIndex + lookAheadStep - 1L;
            final int lookAheadSeqOffset = AtomicQueueUtil.calcCircularLongElementOffset(lookAheadIndex, mask);
            final long lookAheadSeq = AtomicQueueUtil.lvLongElement(sBuffer, lookAheadSeqOffset);
            final long expectedLookAheadSeq = lookAheadIndex + 1L;
            if (lookAheadSeq == expectedLookAheadSeq && this.casConsumerIndex(cIndex, expectedLookAheadSeq)) {
                for (int i = 0; i < lookAheadStep; ++i) {
                    final long index = cIndex + i;
                    final int seqOffset = AtomicQueueUtil.calcCircularLongElementOffset(index, mask);
                    final int offset = AtomicQueueUtil.calcCircularRefElementOffset(index, mask);
                    final long expectedSeq = index + 1L;
                    while (AtomicQueueUtil.lvLongElement(sBuffer, seqOffset) != expectedSeq) {}
                    final E e = AtomicQueueUtil.lpRefElement(buffer, offset);
                    AtomicQueueUtil.spRefElement(buffer, offset, (E)null);
                    AtomicQueueUtil.soLongElement(sBuffer, seqOffset, index + mask + 1L);
                    c.accept(e);
                }
                consumed += lookAheadStep;
            }
            else {
                if (lookAheadSeq < expectedLookAheadSeq && this.notAvailable(cIndex, mask, sBuffer, cIndex + 1L)) {
                    return consumed;
                }
                return consumed + this.drainOneByOne(c, remaining);
            }
        }
        return limit;
    }
    
    private int drainOneByOne(final MessagePassingQueue.Consumer<E> c, final int limit) {
        final AtomicLongArray sBuffer = this.sequenceBuffer;
        final int mask = this.mask;
        final AtomicReferenceArray<E> buffer = this.buffer;
        for (int i = 0; i < limit; ++i) {
            long seq;
            long expectedSeq;
            long cIndex;
            int seqOffset;
            do {
                cIndex = this.lvConsumerIndex();
                seqOffset = AtomicQueueUtil.calcCircularLongElementOffset(cIndex, mask);
                seq = AtomicQueueUtil.lvLongElement(sBuffer, seqOffset);
                expectedSeq = cIndex + 1L;
                if (seq < expectedSeq) {
                    return i;
                }
            } while (seq > expectedSeq || !this.casConsumerIndex(cIndex, cIndex + 1L));
            final int offset = AtomicQueueUtil.calcCircularRefElementOffset(cIndex, mask);
            final E e = AtomicQueueUtil.lpRefElement(buffer, offset);
            AtomicQueueUtil.spRefElement(buffer, offset, (E)null);
            AtomicQueueUtil.soLongElement(sBuffer, seqOffset, cIndex + mask + 1L);
            c.accept(e);
        }
        return limit;
    }
    
    @Override
    public int fill(final MessagePassingQueue.Supplier<E> s, final int limit) {
        if (null == s) {
            throw new IllegalArgumentException("supplier is null");
        }
        if (limit < 0) {
            throw new IllegalArgumentException("limit is negative:" + limit);
        }
        if (limit == 0) {
            return 0;
        }
        final AtomicLongArray sBuffer = this.sequenceBuffer;
        final int mask = this.mask;
        final AtomicReferenceArray<E> buffer = this.buffer;
        final int maxLookAheadStep = Math.min(this.lookAheadStep, limit);
        int produced = 0;
        while (produced < limit) {
            final int remaining = limit - produced;
            final int lookAheadStep = Math.min(remaining, maxLookAheadStep);
            final long pIndex = this.lvProducerIndex();
            final long lookAheadIndex = pIndex + lookAheadStep - 1L;
            final int lookAheadSeqOffset = AtomicQueueUtil.calcCircularLongElementOffset(lookAheadIndex, mask);
            final long lookAheadSeq = AtomicQueueUtil.lvLongElement(sBuffer, lookAheadSeqOffset);
            final long expectedLookAheadSeq = lookAheadIndex;
            if (lookAheadSeq == expectedLookAheadSeq && this.casProducerIndex(pIndex, expectedLookAheadSeq + 1L)) {
                for (int i = 0; i < lookAheadStep; ++i) {
                    final long index = pIndex + i;
                    final int seqOffset = AtomicQueueUtil.calcCircularLongElementOffset(index, mask);
                    final int offset = AtomicQueueUtil.calcCircularRefElementOffset(index, mask);
                    while (AtomicQueueUtil.lvLongElement(sBuffer, seqOffset) != index) {}
                    AtomicQueueUtil.soRefElement(buffer, offset, s.get());
                    AtomicQueueUtil.soLongElement(sBuffer, seqOffset, index + 1L);
                }
                produced += lookAheadStep;
            }
            else {
                if (lookAheadSeq < expectedLookAheadSeq && this.notAvailable(pIndex, mask, sBuffer, pIndex)) {
                    return produced;
                }
                return produced + this.fillOneByOne(s, remaining);
            }
        }
        return limit;
    }
    
    private boolean notAvailable(final long index, final int mask, final AtomicLongArray sBuffer, final long expectedSeq) {
        final int seqOffset = AtomicQueueUtil.calcCircularLongElementOffset(index, mask);
        final long seq = AtomicQueueUtil.lvLongElement(sBuffer, seqOffset);
        return seq < expectedSeq;
    }
    
    private int fillOneByOne(final MessagePassingQueue.Supplier<E> s, final int limit) {
        final AtomicLongArray sBuffer = this.sequenceBuffer;
        final int mask = this.mask;
        final AtomicReferenceArray<E> buffer = this.buffer;
        for (int i = 0; i < limit; ++i) {
            long seq;
            long pIndex;
            int seqOffset;
            do {
                pIndex = this.lvProducerIndex();
                seqOffset = AtomicQueueUtil.calcCircularLongElementOffset(pIndex, mask);
                seq = AtomicQueueUtil.lvLongElement(sBuffer, seqOffset);
                if (seq < pIndex) {
                    return i;
                }
            } while (seq > pIndex || !this.casProducerIndex(pIndex, pIndex + 1L));
            AtomicQueueUtil.soRefElement(buffer, AtomicQueueUtil.calcCircularRefElementOffset(pIndex, mask), s.get());
            AtomicQueueUtil.soLongElement(sBuffer, seqOffset, pIndex + 1L);
        }
        return limit;
    }
    
    @Override
    public int drain(final MessagePassingQueue.Consumer<E> c) {
        return MessagePassingQueueUtil.drain(this, c);
    }
    
    @Override
    public int fill(final MessagePassingQueue.Supplier<E> s) {
        return MessagePassingQueueUtil.fillBounded(this, s);
    }
    
    @Override
    public void drain(final MessagePassingQueue.Consumer<E> c, final MessagePassingQueue.WaitStrategy w, final MessagePassingQueue.ExitCondition exit) {
        MessagePassingQueueUtil.drain(this, c, w, exit);
    }
    
    @Override
    public void fill(final MessagePassingQueue.Supplier<E> s, final MessagePassingQueue.WaitStrategy wait, final MessagePassingQueue.ExitCondition exit) {
        MessagePassingQueueUtil.fill(this, s, wait, exit);
    }
    
    static {
        MAX_LOOK_AHEAD_STEP = Integer.getInteger("jctools.mpmc.max.lookahead.step", 4096);
    }
}