Implement service for registering, managing, and operating on remote Java proxies over the cluster communication service

Change-Id: I4576e3554cfad08747eed847b73fe695e219f3b8
diff --git a/core/net/src/test/java/org/onosproject/cluster/impl/ProxyManagerTest.java b/core/net/src/test/java/org/onosproject/cluster/impl/ProxyManagerTest.java
new file mode 100644
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+++ b/core/net/src/test/java/org/onosproject/cluster/impl/ProxyManagerTest.java
@@ -0,0 +1,92 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * 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.onosproject.cluster.impl;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.junit.Test;
+import org.onosproject.cluster.NodeId;
+import org.onosproject.cluster.ProxyFactory;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.Serializer;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Proxy manager test.
+ */
+public class ProxyManagerTest {
+    @Test
+    public void testProxyManager() throws Exception {
+        TestClusterCommunicationServiceFactory clusterCommunicatorFactory =
+            new TestClusterCommunicationServiceFactory();
+
+        NodeId a = NodeId.nodeId("a");
+        NodeId b = NodeId.nodeId("b");
+
+        Serializer serializer = Serializer.using(KryoNamespaces.BASIC);
+
+        ProxyInterfaceImpl proxyInterface1 = new ProxyInterfaceImpl();
+        ProxyManager proxyManager1 = new ProxyManager();
+        proxyManager1.clusterCommunicator = clusterCommunicatorFactory.newCommunicationService(a);
+        proxyManager1.activate();
+        proxyManager1.registerProxyService(ProxyInterface.class, proxyInterface1, serializer);
+
+        ProxyInterfaceImpl proxyInterface2 = new ProxyInterfaceImpl();
+        ProxyManager proxyManager2 = new ProxyManager();
+        proxyManager2.clusterCommunicator = clusterCommunicatorFactory.newCommunicationService(b);
+        proxyManager2.activate();
+        proxyManager2.registerProxyService(ProxyInterface.class, proxyInterface2, serializer);
+
+        ProxyFactory<ProxyInterface> proxyFactory1 = proxyManager1.getProxyFactory(ProxyInterface.class, serializer);
+        assertEquals("Hello world!", proxyFactory1.getProxyFor(b).sync("Hello world!"));
+        assertEquals(1, proxyInterface2.syncCalls.get());
+        assertEquals("Hello world!", proxyFactory1.getProxyFor(b).async("Hello world!").join());
+        assertEquals(1, proxyInterface2.asyncCalls.get());
+
+        ProxyFactory<ProxyInterface> proxyFactory2 = proxyManager2.getProxyFactory(ProxyInterface.class, serializer);
+        assertEquals("Hello world!", proxyFactory2.getProxyFor(b).sync("Hello world!"));
+        assertEquals(2, proxyInterface2.syncCalls.get());
+        assertEquals("Hello world!", proxyFactory2.getProxyFor(b).async("Hello world!").join());
+        assertEquals(2, proxyInterface2.asyncCalls.get());
+
+        proxyManager1.deactivate();
+        proxyManager2.deactivate();
+    }
+
+    interface ProxyInterface {
+        String sync(String arg);
+        CompletableFuture<String> async(String arg);
+    }
+
+    class ProxyInterfaceImpl implements ProxyInterface {
+        private final AtomicInteger syncCalls = new AtomicInteger();
+        private final AtomicInteger asyncCalls = new AtomicInteger();
+
+        @Override
+        public String sync(String arg) {
+            syncCalls.incrementAndGet();
+            return arg;
+        }
+
+        @Override
+        public CompletableFuture<String> async(String arg) {
+            asyncCalls.incrementAndGet();
+            return CompletableFuture.completedFuture(arg);
+        }
+    }
+}