Cache Interceptor signature result

src/main/java/org/apache/ibatis/plugin/Plugin.java

@@ -22,6 +22,7 @@
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 
 import org.apache.ibatis.reflection.ExceptionUtil;
 
@@ -30,6 +31,8 @@
  */
 public class Plugin implements InvocationHandler {
 
+  private static final Map<Class<? extends Interceptor>, Map<Class<?>, Set<Method>>> signatureMapCache = new ConcurrentHashMap<>();
+
   private final Object target;
   private final Interceptor interceptor;
   private final Map<Class<?>, Set<Method>> signatureMap;
@@ -64,6 +67,10 @@ public Object invoke(Object proxy, Method method, Object[] args) throws Throwabl
   }
 
   private static Map<Class<?>, Set<Method>> getSignatureMap(Interceptor interceptor) {
+    return signatureMapCache.computeIfAbsent(interceptor.getClass(), (clazz) -> createSignatureMap(interceptor));
+  }
+
+  private static Map<Class<?>, Set<Method>> createSignatureMap(Interceptor interceptor) {
     Intercepts interceptsAnnotation = interceptor.getClass().getAnnotation(Intercepts.class);
     // issue #251
     if (interceptsAnnotation == null) {