commit 82fd63255c8a4e331fd1c170495a86725ed1b659
author Aaron Kruglikov <aaron.kruglikov@us.fujitsu.com> Tue Oct 06 12:02:46 2015 -0700
committer Gerrit Code Review <gerrit@onlab.us> Tue Oct 06 22:31:19 2015 +0000
tree a0af8f570e5b348c2da061642b6507f16df2297f
parent d07c0920252373227907128da6befa5a1e0b8ce2

Adding atomic countetr compare and set method

Change-Id: I5cf459e9e09ab1a84ced8160ef61d6a52ea4bea4

core/api/src/main/java/org/onosproject/store/service/AsyncAtomicCounter.java

diff --git a/core/api/src/main/java/org/onosproject/store/service/AsyncAtomicCounter.java b/core/api/src/main/java/org/onosproject/store/service/AsyncAtomicCounter.java
index 92efd39..c0df713 100644
--- a/core/api/src/main/java/org/onosproject/store/service/AsyncAtomicCounter.java
+++ b/core/api/src/main/java/org/onosproject/store/service/AsyncAtomicCounter.java
@@ -66,4 +66,13 @@
      * @return future void
      */
     CompletableFuture<Void> set(long value);
+
+    /**
+     * Atomically sets the given counter to the updated value if the current value is the expected value, otherwise
+     * no change occurs.
+     * @param expectedValue the expected current value of the counter
+     * @param updateValue the new value to be set
+     * @return true if the update occurred and the expected value was equal to the current value, false otherwise
+     */
+    CompletableFuture<Boolean> compareAndSet(long expectedValue, long updateValue);
 }

core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java

diff --git a/core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java b/core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java
index 051838a..3c9e02c 100644
--- a/core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java
+++ b/core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java
@@ -57,6 +57,14 @@
      */
     void set(long value);
 
+    /**
+     * Atomically sets the given counter to the updated value if the current value is the expected value, otherwise
+     * no change occurs.
+     * @param expectedValue the expected current value of the counter
+     * @param updateValue the new value to be set
+     * @return true if the update occurred and the expected value was equal to the current value, false otherwise
+     */
+    boolean compareAndSet(long expectedValue, long updateValue);
 
     /**
      * Returns the current value of the counter without modifying it.

core/api/src/test/java/org/onosproject/store/service/TestAtomicCounter.java

diff --git a/core/api/src/test/java/org/onosproject/store/service/TestAtomicCounter.java b/core/api/src/test/java/org/onosproject/store/service/TestAtomicCounter.java
index 26a5040..8c577df 100644
--- a/core/api/src/test/java/org/onosproject/store/service/TestAtomicCounter.java
+++ b/core/api/src/test/java/org/onosproject/store/service/TestAtomicCounter.java
@@ -53,6 +53,11 @@
     }
 
     @Override
+    public boolean compareAndSet(long expectedValue, long updateValue) {
+        return value.compareAndSet(expectedValue, updateValue);
+    }
+
+    @Override
     public long get() {
         return value.get();
     }