diff --git a/core/api/src/main/java/org/onosproject/net/newresource/ResourceService.java b/core/api/src/main/java/org/onosproject/net/newresource/ResourceService.java
new file mode 100644
index 0000000..3322362
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/newresource/ResourceService.java
@@ -0,0 +1,128 @@
+/*
+ * 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.newresource;
+
+import com.google.common.annotations.Beta;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Service for allocating/releasing resource(s) and retrieving allocation(s) and availability.
+ */
+@Beta
+public interface ResourceService {
+    /**
+     * Allocates the specified resource to the specified user.
+     *
+     * @param consumer resource user which the resource is allocated to
+     * @param resource resource to be allocated
+     * @param <S> type of the subject which this resource belongs to
+     * @param <T> type of the resource
+     * @return allocation information enclosed by Optional. If the allocation fails, the return value is empty
+     */
+    <S, T> Optional<ResourceAllocation<S, T>> allocate(ResourceConsumer consumer, Resource<S, T> resource);
+
+    /**
+     * Transactionally allocates the specified resources to the specified user.
+     * All allocations are made when this method succeeds, or no allocation is made when this method fails.
+     *
+     * @param consumer resource user which the resources are allocated to
+     * @param resources resources to be allocated
+     * @return non-empty list of allocation information if succeeded, otherwise empty list
+     */
+    List<ResourceAllocation<?, ?>> allocate(ResourceConsumer consumer, List<? extends Resource<?, ?>> resources);
+
+    /**
+     * Transactionally allocates the specified resources to the specified user.
+     * All allocations are made when this method succeeds, or no allocation is made when this method fails.
+     *
+     * @param consumer resource user which the resources are allocated to
+     * @param resources resources to be allocated
+     * @return non-empty list of allocation information if succeeded, otherwise empty list
+     */
+    List<ResourceAllocation<?, ?>> allocate(ResourceConsumer consumer, Resource<?, ?>... resources);
+
+    /**
+     * Releases the specified resource allocation.
+     *
+     * @param allocation resource allocation to be released
+     * @param <S> type of the subject which this resource belongs to
+     * @param <T> type of the device resource
+     * @return true if succeeded, otherwise false
+     */
+    <S, T> boolean release(ResourceAllocation<S, T> allocation);
+
+    /**
+     * Transactionally releases the specified resource allocations.
+     * All allocations are released when this method succeeded, or no allocation is released when this method fails.
+     *
+     * @param allocations resource allocations to be released
+     * @return true if succeeded, otherwise false
+     */
+    boolean release(List<? extends ResourceAllocation<?, ?>> allocations);
+
+    /**
+     * Transactionally releases the specified resource allocations.
+     * All allocations are released when this method succeeded, or no allocation is released when this method fails.
+     *
+     * @param allocations resource allocations to be released
+     * @return true if succeeded, otherwise false
+     */
+    boolean release(ResourceAllocation<?, ?>... allocations);
+
+    /**
+     * Transactionally releases the resources allocated to the specified consumer.
+     * All allocations are released when this method succeeded, or no allocation is released when this method fails.
+     *
+     * @param consumer consumer whose allocated resources are to be released
+     * @return true if succeeded, otherwise false
+     */
+    boolean release(ResourceConsumer consumer);
+
+    /**
+     * Returns allocated resources in the specified subject regarding the specified resource type.
+     *
+     * @param subject subject where resource allocations are obtained
+     * @param cls class to specify a type of resource
+     * @param <S> type of the subject
+     * @param <T> type of the resource
+     * @return non-empty collection of resource allocations if resources are allocated with the subject and type,
+     * empty collection if no resource is allocated with the subject and type
+     */
+    <S, T> Collection<ResourceAllocation<S, T>> getResourceAllocations(S subject, Class<T> cls);
+
+    /**
+     * Returns resources allocated to the specified consumer.
+     *
+     * @param consumer consumer whose allocated resources are to be returned
+     * @return resources allocated to the consumer
+     */
+    Collection<ResourceAllocation<?, ?>> getResourceAllocations(ResourceConsumer consumer);
+
+    /**
+     * Returns the availability of the specified device resource.
+     *
+     * @param resource resource to check the availability
+     * @param <S> type of the subject
+     * @param <T> type of the resource
+     * @return true if available, otherwise false
+     */
+    <S, T> boolean isAvailable(Resource<S, T> resource);
+
+    // TODO: listener and event mechanism need to be considered
+}