| /* |
| * Copyright 2016-present 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.resource; |
| |
| import com.google.common.annotations.Beta; |
| import com.google.common.collect.ImmutableList; |
| import org.onosproject.event.ListenerService; |
| |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Optional; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| /** |
| * Service for allocating/releasing resource(s) and retrieving allocation(s) and availability. |
| */ |
| @Beta |
| public interface ResourceService extends ResourceQueryService, ListenerService<ResourceEvent, ResourceListener> { |
| /** |
| * Allocates the specified resource to the specified user. |
| * |
| * @param consumer resource user which the resource is allocated to |
| * @param resource resource to be allocated |
| * @return allocation information enclosed by Optional. If the allocation fails, the return value is empty |
| */ |
| default Optional<ResourceAllocation> allocate(ResourceConsumer consumer, Resource resource) { |
| checkNotNull(consumer); |
| checkNotNull(resource); |
| |
| List<ResourceAllocation> allocations = allocate(consumer, ImmutableList.of(resource)); |
| if (allocations.isEmpty()) { |
| return Optional.empty(); |
| } |
| |
| assert allocations.size() == 1; |
| |
| ResourceAllocation allocation = allocations.get(0); |
| |
| assert allocation.resource().equals(resource); |
| |
| // cast is ensured by the assertions above |
| return Optional.of(allocation); |
| } |
| |
| /** |
| * 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 |
| */ |
| default List<ResourceAllocation> allocate(ResourceConsumer consumer, Resource... resources) { |
| checkNotNull(consumer); |
| checkNotNull(resources); |
| |
| return allocate(consumer, Arrays.asList(resources)); |
| } |
| |
| /** |
| * Releases the specified resource allocation. |
| * |
| * @param allocation resource allocation to be released |
| * @return true if succeeded, otherwise false |
| */ |
| default boolean release(ResourceAllocation allocation) { |
| checkNotNull(allocation); |
| |
| return release(ImmutableList.of(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<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 |
| */ |
| default boolean release(ResourceAllocation... allocations) { |
| checkNotNull(allocations); |
| |
| return release(ImmutableList.copyOf(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); |
| |
| // TODO: listener and event mechanism need to be considered |
| } |