add license

Author: dbl-x

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

@@ -1,10 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package io.openmessaging.api;
 
 /**
  * {@code ProducerBase} is the basic of other {@code Producer} interfaces
  * and is used to define some common methods.
  *
- * @author chengyi (mark.lx@antfin.com) 2020-05-22 11:12
+ * @version OMS 2.0.3
+ * @since OMS 2.0.3
  */
 public interface ProducerBase {