From 94cc3a3917f086caaafa33df7cb9a21f049c025a Mon Sep 17 00:00:00 2001
From: Peter Lawrey <peter.lawrey@higherfrequencytrading.com>
Date: Fri, 24 Jul 2015 19:49:40 +0300
Subject: [PATCH] CHENT-49 performance tune repeated puts.

---
 pom.xml                                                   | 2 +-
 .../net/openhft/chronicle/map/VanillaChronicleMap.java    | 8 ++++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/pom.xml b/pom.xml
index 5f4b85464..7496f51e5 100755
--- a/pom.xml
+++ b/pom.xml
@@ -44,7 +44,7 @@
             <dependency>
                 <groupId>net.openhft</groupId>
                 <artifactId>chronicle-bom</artifactId>
-                <version>1.5.19</version>
+                <version>1.5.21-SNAPSHOT</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
diff --git a/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java b/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
index cc99e5e21..c079744b9 100755
--- a/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
+++ b/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
@@ -2101,9 +2101,11 @@ class VanillaChronicleMap<K, KI, MKI extends MetaBytesInterop<K, ? super KI>,
                 KB key, long keySize, InstanceOrBytesToInstance<KB, K> toKey,
                 ReadValue<RV> readValue, RV usingValue, InstanceOrBytesToInstance<RV, V> toValue,
                 MultiStoreBytes entry) {
+            RV v = null;
             long valueSize = readValueSize(entry);
             long valuePos = entry.position();
-            RV v = readValue.readValue(copies, entry, usingValue, valueSize);
+            if (!putReturnsNull)
+                v = readValue.readValue(copies, entry, usingValue, valueSize);
 
             // get callbacks
             if (bytesEventListener != null) {
@@ -2234,7 +2236,9 @@ class VanillaChronicleMap<K, KI, MKI extends MetaBytesInterop<K, ? super KI>,
             // todo optimize -- prevValue could be read twice
             if (eventListener != null && !entryIsDeleted) {
                 entry.positionAddr(valueAddr);
-                prevValueInstance = readValue(copies, entry, null, prevValueSize);
+                prevValueInstance = null;
+                if (!putReturnsNull)
+                    prevValueInstance = readValue(copies, entry, null, prevValueSize);
             }
 
             // putValue may relocate entry and change offset