Add openmessaging module.

example/src/main/java/org/apache/rocketmq/example/openmessaging/SimpleProducer.java

+/*
+ * 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 org.apache.rocketmq.example.openmessaging;
+
+public class SimpleProducer {
+    public static void main(String[] args) {
+
+    }
+}

openmessaging/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  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.
+  -->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>rocketmq-all</artifactId>
+        <groupId>org.apache.rocketmq</groupId>
+        <version>4.1.0-incubating-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>rocketmq-openmessaging</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.openmessaging</groupId>
+            <artifactId>messaging-user-level-api</artifactId>
+        </dependency>
+    </dependencies>
+</project>
\ No newline at end of file

openmessaging/src/main/java/io/openmessaging/rocketmq/MessagingAccessPointImpl.java

+/*
+ * 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.rocketmq;
+
+import io.openmessaging.IterableConsumer;
+import io.openmessaging.KeyValue;
+import io.openmessaging.MessagingAccessPoint;
+import io.openmessaging.Producer;
+import io.openmessaging.PullConsumer;
+import io.openmessaging.PushConsumer;
+import io.openmessaging.ResourceManager;
+import io.openmessaging.SequenceProducer;
+import io.openmessaging.ServiceEndPoint;
+import io.openmessaging.observer.Observer;
+
+public class MessagingAccessPointImpl implements MessagingAccessPoint {
+    @Override
+    public Producer createProducer() {
+        return null;
+    }
+
+    @Override
+    public Producer createProducer(KeyValue properties) {
+        return null;
+    }
+
+    @Override
+    public SequenceProducer createSequenceProducer() {
+        return null;
+    }
+
+    @Override
+    public SequenceProducer createSequenceProducer(KeyValue properties) {
+        return null;
+    }
+
+    @Override
+    public PushConsumer createPushConsumer() {
+        return null;
+    }
+
+    @Override
+    public PushConsumer createPushConsumer(KeyValue properties) {
+        return null;
+    }
+
+    @Override
+    public PullConsumer createPullConsumer(String queueName) {
+        return null;
+    }
+
+    @Override
+    public PullConsumer createPullConsumer(String queueName, KeyValue properties) {
+        return null;
+    }
+
+    @Override
+    public IterableConsumer createIterableConsumer(String queueName) {
+        return null;
+    }
+
+    @Override
+    public IterableConsumer createIterableConsumer(String queueName, KeyValue properties) {
+        return null;
+    }
+
+    @Override
+    public ResourceManager createResourceManager() {
+        return null;
+    }
+
+    @Override
+    public ServiceEndPoint createServiceEndPoint() {
+        return null;
+    }
+
+    @Override
+    public ServiceEndPoint createServiceEndPoint(KeyValue properties) {
+        return null;
+    }
+
+    @Override
+    public void addObserver(Observer observer) {
+
+    }
+
+    @Override
+    public void deleteObserver(Observer observer) {
+
+    }
+
+    @Override
+    public void startup() {
+        //Ignore
+    }
+
+    @Override
+    public void shutdown() {
+        //Ignore
+    }
+}

pom.xml

@@ -180,6 +180,7 @@
         <module>srvutil</module>
         <module>test</module>
         <module>distribution</module>
+        <module>openmessaging</module>
     </modules>
 
     <build>
@@ -603,6 +604,11 @@
                 <artifactId>commons-lang3</artifactId>
                 <version>3.4</version>
             </dependency>
+            <dependency>
+                <groupId>io.openmessaging</groupId>
+                <artifactId>messaging-user-level-api</artifactId>
+                <version>1.0.0-SNAPSHOT</version>
+            </dependency>
         </dependencies>
     </dependencyManagement>
 </project>