优化ESClientMgr 减少并发锁的影响

@@ -18,32 +18,14 @@ public class ESClientMgr {
 
     private volatile Map<String, IElasticsearchClient> nameToClientMap = new ConcurrentHashMap<String, IElasticsearchClient>(50);
 
-    public IElasticsearchClient getClient(String indexName)
-    {
-        if(nameToClientMap.containsKey(indexName))
-        {
-            return nameToClientMap.get(indexName);
-        }
-
-        IElasticsearchClient client = null;
+    public IElasticsearchClient getClient(String indexName) {
+        return nameToClientMap.computeIfAbsent(indexName, (name) -> {
             IYohoIndexClientFactory factory = new YohoIndexClientFactoryImpl();
             String clusterName = Configuration.getString("search.es.cluster.name");
             String servers = Configuration.getString("search.es.servers");
             Assert.notNull(clusterName, "ClusterName for ES cannot be null.");
             Assert.notNull(servers, "Servers for ES cannot be null.");
-        synchronized (this)
-        {
-            if(nameToClientMap.containsKey(indexName))
-            {
-                // double check
-                return nameToClientMap.get(indexName);
-            }
-
-            client = factory.createIndexClient(clusterName, servers, indexName);
-            nameToClientMap.putIfAbsent(indexName, client);
+            return factory.createIndexClient(clusterName, servers, name);
+        });
     }
-
-        return client;
-    }
-
 }