From 3a518603d5f4ee0f7480865fd0ce457c70b96b53 Mon Sep 17 00:00:00 2001
From: Liang Zhang <terrymanu@163.com>
Date: Fri, 15 May 2020 14:00:13 +0800
Subject: [PATCH] Avoid register more times for SPI (#5618)

---
 .../sharding/spi/ShardingSphereServiceLoader.java              | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/shardingsphere-spi/src/main/java/org/apache/shardingsphere/sharding/spi/ShardingSphereServiceLoader.java b/shardingsphere-spi/src/main/java/org/apache/shardingsphere/sharding/spi/ShardingSphereServiceLoader.java
index 72bff22202..fcfc84bcab 100644
--- a/shardingsphere-spi/src/main/java/org/apache/shardingsphere/sharding/spi/ShardingSphereServiceLoader.java
+++ b/shardingsphere-spi/src/main/java/org/apache/shardingsphere/sharding/spi/ShardingSphereServiceLoader.java
@@ -44,6 +44,9 @@ public final class ShardingSphereServiceLoader {
      * @param <T> type of service
      */
     public static <T> void register(final Class<T> service) {
+        if (SERVICE_MAP.containsKey(service)) {
+            return;
+        }
         for (T each : ServiceLoader.load(service)) {
             registerServiceClass(service, each);
         }
-- 
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