diff --git a/core/api/src/main/java/org/onosproject/net/flowext/FlowRuleExtService.java b/core/api/src/main/java/org/onosproject/net/flowext/FlowRuleExtService.java
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index 0000000..7db2545
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+++ b/core/api/src/main/java/org/onosproject/net/flowext/FlowRuleExtService.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed 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.onosproject.net.flowext;
+
+import org.onosproject.net.flow.FlowRuleBatchRequest;
+import org.onosproject.net.flow.FlowRuleService;
+
+import java.util.concurrent.Future;
+
+/**
+ * Experimental extension to the flow rule subsystem; still under development.
+ * Service for injecting extended flow rules into the environment.
+ * This service just send the packet downstream. It won't store the
+ * flowRuleExtension in cache.
+ */
+public interface FlowRuleExtService extends FlowRuleService {
+    /**
+     * Applies a batch operation of FlowRules.
+     * this batch can be divided into many sub-batch by deviceId, and application
+     * gives a batchId, it means once one flowRule apply failed, all flow rules should
+     * withdraw.
+     *
+     * @param batch batch operation to apply
+     * @return future indicating the state of the batch operation
+     */
+    Future<FlowExtCompletedOperation> applyBatch(FlowRuleBatchRequest batch);
+}