HCOLL-81 StatelessClient : Add a visitor pattern to Chronicle Map

src/test/java/net/openhft/chronicle/map/StatelessClientTest.java

@@ -23,11 +23,13 @@ import org.junit.Assert;
 import org.junit.Test;
 
 import java.io.IOException;
+import java.io.Serializable;
 import java.net.InetSocketAddress;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
+import java.util.function.Function;
 
 
 /**
@@ -39,6 +41,37 @@ public class StatelessClientTest {
     public static final int SIZE = 100000;
 
 
+    static class StringBuilderToStringFunction implements Function<StringBuilder, String>, Serializable {
+
+        @Override
+        public String apply(StringBuilder stringBuilder) {
+            return stringBuilder.toString();
+        }
+    }
+
+
+    @Test
+    public void testMapForKey() throws IOException, InterruptedException {
+
+
+        try (ChronicleMap<Integer, StringBuilder> serverMap = ChronicleMapBuilder.of(Integer.class,
+                StringBuilder.class)
+                .replication((byte) 2, TcpTransportAndNetworkConfig.of(8056)).create()) {
+
+            serverMap.put(10, new StringBuilder("Hello World"));
+
+            try (ChronicleMap<Integer, StringBuilder> statelessMap = ChronicleMapBuilder.of(Integer
+                    .class, StringBuilder.class)
+                    .statelessClient(new InetSocketAddress("localhost", 8056)).create()) {
+
+                String actual = (String) ((StatelessChronicleMap) statelessMap).mapForKey(10, new StringBuilderToStringFunction());
+
+                Assert.assertEquals("Hello World", actual);
+            }
+        }
+    }
+
+
     @Test(timeout = 5000)
     public void testBufferOverFlowPutAllAndEntrySet() throws IOException, InterruptedException {
 
@@ -167,7 +200,6 @@ public class StatelessClientTest {
                     .statelessClient(new InetSocketAddress("localhost", 8056)).create()) {
 
 
-
                 serverMap.put(10, "EXAMPLE-10");
 
                 Assert.assertEquals("EXAMPLE-10", statelessMap.get(10));
@@ -301,7 +333,6 @@ public class StatelessClientTest {
         final ChronicleMap<Integer, CharSequence> statelessMap2;
 
 
-
         // server
         {
             serverMap1 = ChronicleMapBuilder.of(Integer.class, CharSequence.class)