added example

src/test/java/net/openhft/chronicle/map/example/DoubleArrayExample.java

@@ -0,0 +1,90 @@
+package net.openhft.chronicle.map.example;
+
+import net.openhft.chronicle.map.ChronicleMap;
+import net.openhft.chronicle.map.ChronicleMapBuilder;
+import net.openhft.lang.io.Bytes;
+import net.openhft.lang.io.serialization.BytesMarshallable;
+import org.jetbrains.annotations.NotNull;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+/**
+ * Created by rob on 18/09/2015.
+ * supports and array of up to 128 doubles
+ */
+
+public class DoubleArrayExample {
+
+    static final long SIZE_OF_DOUBLE = 8;
+    static final long SIZE_OF_INT = 4;
+
+    public static void main(String[] args) throws IOException {
+
+        ChronicleMap<Long, ValueWrapper> map = ChronicleMapBuilder.of(Long.class, ValueWrapper.class)
+                .entries(512)
+                .averageValueSize(SIZE_OF_INT + (128 * SIZE_OF_DOUBLE)).create();
+
+        //        .createPersistedTo(File.createTempFile("map", "chron"));
+        System.out.println("Created the monkey map ValueWrapper 128");
+
+
+        double[] values = new double[125];
+
+        Arrays.fill(values, 1.1);
+
+        final ValueWrapper value = new ValueWrapper(values);
+
+        map.put(1L, value);
+
+        ValueWrapper valueRead = map.get(1L);
+
+        for (double v : valueRead.getValues()) {
+            System.out.println("" + v);
+        }
+
+
+    }
+
+
+    private static class ValueWrapper implements BytesMarshallable {
+
+        private double values[];
+
+        public double[] getValues() {
+            return values;
+        }
+
+        public ValueWrapper(@NotNull double[] values) {
+            this.values = values;
+        }
+
+        @Override
+        public void readMarshallable(Bytes bytes) throws IllegalStateException {
+
+            assert bytes.readInt() <= 128;
+
+            values = new double[bytes.readInt()];
+
+            for (int i = 0; i < values.length; i++) {
+                values[i] = bytes.readDouble();
+            }
+
+        }
+
+        @Override
+        public void writeMarshallable(Bytes bytes) {
+
+            bytes.writeInt(values.length);
+
+            for (double value : values) {
+                bytes.writeDouble(value);
+            }
+
+
+        }
+    }
+
+
+}
+