Add AverageValueSizeTest

src/test/java/eg/AverageValueSizeTest.java

@@ -0,0 +1,48 @@
+/*
+ *      Copyright (C) 2015  higherfrequencytrading.com
+ *
+ *      This program is free software: you can redistribute it and/or modify
+ *      it under the terms of the GNU Lesser General Public License as published by
+ *      the Free Software Foundation, either version 3 of the License.
+ *
+ *      This program is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU Lesser General Public License for more details.
+ *
+ *      You should have received a copy of the GNU Lesser General Public License
+ *      along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package eg;
+
+import net.openhft.chronicle.map.ChronicleMap;
+import net.openhft.chronicle.map.MapSegmentContext;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.LongSummaryStatistics;
+
+public class AverageValueSizeTest {
+
+    public static <V> double averageValueSize(Class<V> valueClass, Iterable<V> values) {
+        ChronicleMap<Integer, V> testMap = ChronicleMap.of(Integer.class, valueClass)
+                // doesn't matter, anyway not a single value will be written to a map
+                .averageValueSize(1)
+                .entries(1)
+                .create();
+        LongSummaryStatistics statistics = new LongSummaryStatistics();
+        for (V value : values) {
+            try (MapSegmentContext<Integer, V, ?> c = testMap.segmentContext(0)) {
+                statistics.accept(c.wrapValueAsData(value).size());
+            }
+        }
+        return statistics.getAverage();
+    }
+
+    @Test
+    public void averageValueSizeTest() {
+        System.out.println(averageValueSize(String.class,
+                Arrays.asList("banana", "apple", "watermelon")));
+    }
+}