allow Byteable instances that have maxSize() determined at runtime

src/main/java/net/openhft/chronicle/hash/serialization/impl/SerializationBuilder.java

@@ -19,6 +19,7 @@ package net.openhft.chronicle.hash.serialization.impl;
 
 import net.openhft.chronicle.bytes.Byteable;
 import net.openhft.chronicle.bytes.BytesMarshallable;
+import net.openhft.chronicle.bytes.DynamicallySized;
 import net.openhft.chronicle.core.OS;
 import net.openhft.chronicle.core.annotation.NotNull;
 import net.openhft.chronicle.core.util.ReadResolvable;
@@ -190,8 +191,9 @@ public final class SerializationBuilder<T> implements Cloneable {
     }
 
     public long constantSizeBySample(T sampleObject) {
+        // TODO mark.price this should probably be maxSize()
         long constantSize = serializationSize(sampleObject);
-        if (constantSizeMarshaller()) {
+        if (constantSizeMarshaller() && !DynamicallySized.class.isAssignableFrom(sampleObject.getClass())) {
             long expectedConstantSize = constantSize();
             if (constantSize != expectedConstantSize) {
                 throw new IllegalStateException("Although configuring constant size by sample " +

src/main/java/net/openhft/chronicle/map/ChronicleMapBuilder.java

@@ -820,6 +820,11 @@ public final class ChronicleMapBuilder<K, V> implements
         if (maxChunksPerEntry < 1)
             throw new IllegalArgumentException("maxChunksPerEntry should be >= 1, " +
                     maxChunksPerEntry + " given");
+        if (constantlySizedEntries()) {
+            throw new IllegalStateException("Sizes of key type: " + keyBuilder.tClass + " and " +
+                    "value type: " + valueBuilder.tClass + " are both constant, " +
+                    "so maxChunksPerEntry shouldn't be specified manually");
+        }
         this.maxChunksPerEntry = maxChunksPerEntry;
         return this;
     }
@@ -1821,6 +1826,11 @@ public final class ChronicleMapBuilder<K, V> implements
                 keyBuilder, averageKeySize, averageKey, sampleKey, "Key");
         averageValueSize = preMapConstruction(
                 valueBuilder, averageValueSize, averageValue, sampleValue, "Value");
+
+        // TODO mark.price
+//        System.out.printf(Thread.currentThread().getName() + "|++!! averageValueSize calculated as %.2f%n",
+//                averageValueSize);
+
         stateChecks();
     }