directly replace Fence with the methods setRelease, setVolatile, and …

…getAcquire

Since we already have VALUE_FIELD, it is more semantically clear to directly replace Fence with the methods setRelease, setVolatile, and getAcquire. No need to set barriers via VarHandle

src/test/java/com/lmax/disruptor/alternatives/SequenceVarHandleBarrier.java

@@ -74,8 +74,7 @@ public SequenceVarHandleBarrier()
      */
     public SequenceVarHandleBarrier(final long initialValue)
     {
-        VarHandle.releaseFence();
-        this.value = initialValue;
+        VALUE_FIELD.setRelease(this,initialValue);
     }
 
     /**
@@ -85,9 +84,7 @@ public SequenceVarHandleBarrier(final long initialValue)
      */
     public long get()
     {
-        long value = this.value;
-        VarHandle.acquireFence();
-        return value;
+       return (long) VALUE_FIELD.getAcquire(this);
     }
 
     /**
@@ -99,8 +96,7 @@ public long get()
      */
     public void set(final long value)
     {
-        VarHandle.releaseFence();
-        this.value = value;
+        VALUE_FIELD.setRelease(this,value);
     }
 
     /**
@@ -113,9 +109,7 @@ public void set(final long value)
      */
     public void setVolatile(final long value)
     {
-        VarHandle.releaseFence();
-        this.value = value;
-        VarHandle.fullFence();
+        VALUE_FIELD.setVolatile(this,value);
     }
 
     /**
@@ -156,4 +150,4 @@ public String toString()
     {
         return Long.toString(get());
     }
-}
+}