adds MpscUnboundedArrayQueue changes from JCTools

rsocket-core/src/main/java/io/rsocket/internal/jctools/queues/BaseLinkedQueue.java

@@ -13,34 +13,51 @@
  */
 package io.rsocket.internal.jctools.queues;
 
-import static io.rsocket.internal.jctools.util.UnsafeAccess.UNSAFE;
-import static io.rsocket.internal.jctools.util.UnsafeAccess.fieldOffset;
+import static io.rsocket.internal.jctools.queues.UnsafeAccess.UNSAFE;
+import static io.rsocket.internal.jctools.queues.UnsafeAccess.fieldOffset;
 
 import java.util.AbstractQueue;
 import java.util.Iterator;
 
 abstract class BaseLinkedQueuePad0<E> extends AbstractQueue<E> implements MessagePassingQueue<E> {
-  long p00, p01, p02, p03, p04, p05, p06, p07;
-  long p10, p11, p12, p13, p14, p15, p16;
+  byte b000, b001, b002, b003, b004, b005, b006, b007; //  8b
+  byte b010, b011, b012, b013, b014, b015, b016, b017; // 16b
+  byte b020, b021, b022, b023, b024, b025, b026, b027; // 24b
+  byte b030, b031, b032, b033, b034, b035, b036, b037; // 32b
+  byte b040, b041, b042, b043, b044, b045, b046, b047; // 40b
+  byte b050, b051, b052, b053, b054, b055, b056, b057; // 48b
+  byte b060, b061, b062, b063, b064, b065, b066, b067; // 56b
+  byte b070, b071, b072, b073, b074, b075, b076, b077; // 64b
+  byte b100, b101, b102, b103, b104, b105, b106, b107; // 72b
+  byte b110, b111, b112, b113, b114, b115, b116, b117; // 80b
+  byte b120, b121, b122, b123, b124, b125, b126, b127; // 88b
+  byte b130, b131, b132, b133, b134, b135, b136, b137; // 96b
+  byte b140, b141, b142, b143, b144, b145, b146, b147; // 104b
+  byte b150, b151, b152, b153, b154, b155, b156, b157; // 112b
+  byte b160, b161, b162, b163, b164, b165, b166, b167; // 120b
+  // byte b170,b171,b172,b173,b174,b175,b176,b177;//128b
+  //    * drop 8b as object header acts as padding and is >= 8b *
 }
 
 // $gen:ordered-fields
 abstract class BaseLinkedQueueProducerNodeRef<E> extends BaseLinkedQueuePad0<E> {
   static final long P_NODE_OFFSET =
       fieldOffset(BaseLinkedQueueProducerNodeRef.class, "producerNode");
 
-  private LinkedQueueNode<E> producerNode;
+  private volatile LinkedQueueNode<E> producerNode;
 
   final void spProducerNode(LinkedQueueNode<E> newValue) {
-    producerNode = newValue;
+    UNSAFE.putObject(this, P_NODE_OFFSET, newValue);
+  }
+
+  final void soProducerNode(LinkedQueueNode<E> newValue) {
+    UNSAFE.putOrderedObject(this, P_NODE_OFFSET, newValue);
   }
 
-  @SuppressWarnings("unchecked")
   final LinkedQueueNode<E> lvProducerNode() {
-    return (LinkedQueueNode<E>) UNSAFE.getObjectVolatile(this, P_NODE_OFFSET);
+    return producerNode;
   }
 
-  @SuppressWarnings("unchecked")
   final boolean casProducerNode(LinkedQueueNode<E> expect, LinkedQueueNode<E> newValue) {
     return UNSAFE.compareAndSwapObject(this, P_NODE_OFFSET, expect, newValue);
   }
@@ -51,8 +68,22 @@ final LinkedQueueNode<E> lpProducerNode() {
 }
 
 abstract class BaseLinkedQueuePad1<E> extends BaseLinkedQueueProducerNodeRef<E> {
-  long p01, p02, p03, p04, p05, p06, p07;
-  long p10, p11, p12, p13, p14, p15, p16, p17;
+  byte b000, b001, b002, b003, b004, b005, b006, b007; //  8b
+  byte b010, b011, b012, b013, b014, b015, b016, b017; // 16b
+  byte b020, b021, b022, b023, b024, b025, b026, b027; // 24b
+  byte b030, b031, b032, b033, b034, b035, b036, b037; // 32b
+  byte b040, b041, b042, b043, b044, b045, b046, b047; // 40b
+  byte b050, b051, b052, b053, b054, b055, b056, b057; // 48b
+  byte b060, b061, b062, b063, b064, b065, b066, b067; // 56b
+  byte b070, b071, b072, b073, b074, b075, b076, b077; // 64b
+  byte b100, b101, b102, b103, b104, b105, b106, b107; // 72b
+  byte b110, b111, b112, b113, b114, b115, b116, b117; // 80b
+  byte b120, b121, b122, b123, b124, b125, b126, b127; // 88b
+  byte b130, b131, b132, b133, b134, b135, b136, b137; // 96b
+  byte b140, b141, b142, b143, b144, b145, b146, b147; // 104b
+  byte b150, b151, b152, b153, b154, b155, b156, b157; // 112b
+  byte b160, b161, b162, b163, b164, b165, b166, b167; // 120b
+  byte b170, b171, b172, b173, b174, b175, b176, b177; // 128b
 }
 
 // $gen:ordered-fields
@@ -77,16 +108,27 @@ final LinkedQueueNode<E> lpConsumerNode() {
 }
 
 abstract class BaseLinkedQueuePad2<E> extends BaseLinkedQueueConsumerNodeRef<E> {
-  long p01, p02, p03, p04, p05, p06, p07;
-  long p10, p11, p12, p13, p14, p15, p16, p17;
+  byte b000, b001, b002, b003, b004, b005, b006, b007; //  8b
+  byte b010, b011, b012, b013, b014, b015, b016, b017; // 16b
+  byte b020, b021, b022, b023, b024, b025, b026, b027; // 24b
+  byte b030, b031, b032, b033, b034, b035, b036, b037; // 32b
+  byte b040, b041, b042, b043, b044, b045, b046, b047; // 40b
+  byte b050, b051, b052, b053, b054, b055, b056, b057; // 48b
+  byte b060, b061, b062, b063, b064, b065, b066, b067; // 56b
+  byte b070, b071, b072, b073, b074, b075, b076, b077; // 64b
+  byte b100, b101, b102, b103, b104, b105, b106, b107; // 72b
+  byte b110, b111, b112, b113, b114, b115, b116, b117; // 80b
+  byte b120, b121, b122, b123, b124, b125, b126, b127; // 88b
+  byte b130, b131, b132, b133, b134, b135, b136, b137; // 96b
+  byte b140, b141, b142, b143, b144, b145, b146, b147; // 104b
+  byte b150, b151, b152, b153, b154, b155, b156, b157; // 112b
+  byte b160, b161, b162, b163, b164, b165, b166, b167; // 120b
+  byte b170, b171, b172, b173, b174, b175, b176, b177; // 128b
 }
 
 /**
  * A base data structure for concurrent linked queues. For convenience also pulled in common single
  * consumer methods since at this time there's no plan to implement MC.
- *
- * @param <E>
- * @author nitsanw
  */
 abstract class BaseLinkedQueue<E> extends BaseLinkedQueuePad2<E> {
 
@@ -158,8 +200,10 @@ public final int size() {
    * @see MessagePassingQueue#isEmpty()
    */
   @Override
-  public final boolean isEmpty() {
-    return lvConsumerNode() == lvProducerNode();
+  public boolean isEmpty() {
+    LinkedQueueNode<E> consumerNode = lvConsumerNode();
+    LinkedQueueNode<E> producerNode = lvProducerNode();
+    return consumerNode == producerNode;
   }
 
   protected E getSingleConsumerNodeValue(