Polish ServiceLifecycle interface

Author: duhengforever

openmessaging-api/src/main/java/io/openmessaging/ServiceLifeState.java

@@ -23,6 +23,11 @@ public enum ServiceLifeState {
      */
     STARTED,
 
+    /**
+     * Service is stopping.
+     */
+    STOPING,
+
     /**
      * Service has been shutdown.
      */

openmessaging-api/src/main/java/io/openmessaging/ServiceLifecycle.java

@@ -37,16 +37,17 @@ public interface ServiceLifecycle {
      * Used for startup or initialization of a service endpoint. A service endpoint instance will be in a ready state
      * after this method has been completed.
      */
-    void startup();
+    void start();
 
     /**
      * Notify a service instance of the end of its life cycle. Once this method completes, the service endpoint could be
      * destroyed and eligible for garbage collection.
      */
-    void shutdown();
+    void stop();
 
     /**
      * Used for get service current state, for execution of some operations is dependent on the current service state.
+     *
      * @return This service current state {@link ServiceLifeState}
      */
     ServiceLifeState currentState();