ConfigUtil: Support setting concurrencyLevel

Change-Id: I79b5d58b88b4871438176b1f0afb228f403acf01

java/com/google/gitiles/ConfigUtil.java

diff --git a/java/com/google/gitiles/ConfigUtil.java b/java/com/google/gitiles/ConfigUtil.java
index 131a62c..8765d8d 100644
--- a/java/com/google/gitiles/ConfigUtil.java
+++ b/java/com/google/gitiles/ConfigUtil.java
@@ -60,6 +60,9 @@
   public static CacheBuilder<Object, Object> getCacheBuilder(Config config, String name) {
     CacheBuilder<Object, Object> b = CacheBuilder.newBuilder();
     try {
+      if (config.getString("cache", name, "concurrencyLevel") != null) {
+        b.concurrencyLevel(config.getInt("cache", name, "concurrencyLevel", 4));
+      }
       if (config.getString("cache", name, "maximumWeight") != null) {
         b.maximumWeight(config.getLong("cache", name, "maximumWeight", 20 << 20));
       }