src/share/classes/java/util/concurrent/atomic/AtomicLongFieldUpdater.java

*** 32,41 ****
--- 32,43 ----
   * Expert Group and released to the public domain, as explained at
   * http://creativecommons.org/publicdomain/zero/1.0/
   */
  
  package java.util.concurrent.atomic;
+ import java.util.function.LongUnaryOperator;
+ import java.util.function.LongBinaryOperator;
  import sun.misc.Unsafe;
  import java.lang.reflect.Field;
  import java.lang.reflect.Modifier;
  import java.security.AccessController;
  import java.security.PrivilegedExceptionAction;
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          do {
              prev = get(obj);
              next = prev + delta;
          } while (!compareAndSet(obj, prev, next));
          return next;
+     }
+ 
+     /**
+      * Atomically updates the current value with the results of
+      * applying the given function. The function should be
+      * side-effect-free, since it may be re-applied when attempted
+      * updates fail due to contention among threads.
+      *
+      * @param obj An object whose field to get and set
+      * @param updateFunction a side-effect-free function
+      * @return the previous value
+      * @since 1.8
+      */
+     public final long getAndUpdate(T obj, LongUnaryOperator updateFunction) {
+         long prev, next;
+         do {
+             prev = get(obj);
+             next = updateFunction.operateAsLong(prev);
+         } while (!compareAndSet(obj, prev, next));
+         return prev;
+     }
+ 
+     /**
+      * Atomically updates the current value with the results of
+      * applying the given function. The function should be
+      * side-effect-free, since it may be re-applied when attempted
+      * updates fail due to contention among threads.
+      *
+      * @param obj An object whose field to get and set
+      * @param updateFunction a side-effect-free function
+      * @return the updated value
+      * @since 1.8
+      */
+     public final long updateAndGet(T obj, LongUnaryOperator updateFunction) {
+         long prev, next;
+         do {
+             prev = get(obj);
+             next = updateFunction.operateAsLong(prev);
+         } while (!compareAndSet(obj, prev, next));
+         return next;
+     }
+ 
+     /**
+      * Atomically updates the current value with the results of
+      * applying the given function to the current and given values.
+      * The function should be side-effect-free, since it may be
+      * re-applied when attempted updates fail due to contention among
+      * threads.  The function is applied with the current value as its
+      * first argument, and the given update as the second argument.
+      *
+      * @param obj An object whose field to get and set
+      * @param x the update value
+      * @param accumulatorFunction a side-effect-free function of two arguments
+      * @return the previous value
+      * @since 1.8
+      */
+     public final long getAndAccumulate(T obj, long x,
+                                        LongBinaryOperator accumulatorFunction) {
+         long prev, next;
+         do {
+             prev = get(obj);
+             next = accumulatorFunction.operateAsLong(prev, x);
+         } while (!compareAndSet(obj, prev, next));
+         return prev;
+     }
+ 
+     /**
+      * Atomically updates the current value with the results of
+      * applying the given function to the current and given values.
+      * The function should be side-effect-free, since it may be
+      * re-applied when attempted updates fail due to contention among
+      * threads.  The function is applied with the current value as its
+      * first argument, and the given update as the second argument.
+      *
+      * @param obj An object whose field to get and set
+      * @param x the update value
+      * @param accumulatorFunction a side-effect-free function of two arguments
+      * @return the updated value
+      * @since 1.8
+      */
+     public final long accumulateAndGet(T obj, long x,
+                                        LongBinaryOperator accumulatorFunction) {
+         long prev, next;
+         do {
+             prev = get(obj);
+             next = accumulatorFunction.operateAsLong(prev, x);
+         } while (!compareAndSet(obj, prev, next));
+         return next;
      }
  
      private static class CASUpdater<T> extends AtomicLongFieldUpdater<T> {
          private static final Unsafe unsafe = Unsafe.getUnsafe();
          private final long offset;