Refactor: Migrate v2 runtime components to main runtime and update function APIs

Author: qqeasonchen

eventmesh-common/src/main/java/org/apache/eventmesh/common/enums/ComponentType.java

@@ -20,6 +20,7 @@
 public enum ComponentType {
     CONNECTOR("connector"),
     FUNCTION("function"),
+    ROUTER("router"),
     MESH("mesh");
 
     public String name;

eventmesh-function/eventmesh-function-api/build.gradle

@@ -14,3 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
+dependencies {
+    implementation project(":eventmesh-common")
+}

eventmesh-function/eventmesh-function-api/src/main/java/org/apache/eventmesh/function/api/Router.java

@@ -0,0 +1,38 @@
+/*
+ * 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.eventmesh.function.api;
+
+import org.apache.eventmesh.common.exception.EventMeshException;
+
+/**
+ * EventMesh router interface, used to route messages to different topics or destinations.
+ */
+public interface Router extends EventMeshFunction<String, String> {
+
+    String route(String json);
+
+    @Override
+    default String apply(String content) {
+        try {
+            return route(content);
+        } catch (Exception e) {
+            throw new EventMeshException("Failed to route content", e);
+        }
+    }
+
+}

eventmesh-function/eventmesh-function-router/build.gradle

@@ -0,0 +1,24 @@
+/*
+ * 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.
+ */
+
+dependencies {
+    implementation project(":eventmesh-function:eventmesh-function-api")
+    implementation project(":eventmesh-common")
+
+    testImplementation 'org.junit.jupiter:junit-jupiter-api'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine'
+}

eventmesh-function/eventmesh-function-router/src/main/java/org/apache/eventmesh/function/router/RouterBuilder.java

@@ -0,0 +1,40 @@
+/*
+ * 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.eventmesh.function.router;
+
+import org.apache.eventmesh.function.api.Router;
+
+public class RouterBuilder {
+
+    public static Router build(String routerConfig) {
+        return new DefaultRouter(routerConfig);
+    }
+
+    private static class DefaultRouter implements Router {
+        private final String targetTopic;
+
+        public DefaultRouter(String targetTopic) {
+            this.targetTopic = targetTopic;
+        }
+
+        @Override
+        public String route(String json) {
+            return targetTopic;
+        }
+    }
+}