[ONOS-6267] Support configurable Executors for primitives
- Support user-provided Executors in primitive builders
- Implement default per-partition per-primitive serial executor using a shared thread pool
- Implement Executor wrappers for all primitive types

Change-Id: I53acfb173a9b49a992a9a388983791d9735ed54a
diff --git a/utils/misc/src/test/java/org/onlab/util/SerialExecutorTest.java b/utils/misc/src/test/java/org/onlab/util/SerialExecutorTest.java
new file mode 100644
index 0000000..140ce1f
--- /dev/null
+++ b/utils/misc/src/test/java/org/onlab/util/SerialExecutorTest.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2017-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onlab.util;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.Executor;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Serial executor test.
+ */
+public class SerialExecutorTest {
+
+    @Test
+    public void testSerialExecution() throws Throwable {
+        Executor executor = new SerialExecutor(SharedExecutors.getPoolThreadExecutor());
+        CountDownLatch latch = new CountDownLatch(2);
+        executor.execute(latch::countDown);
+        executor.execute(latch::countDown);
+        latch.await();
+        assertEquals(0, latch.getCount());
+    }
+
+}