| /* |
| * 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.intent.impl.phase; |
| |
| import org.onosproject.net.intent.IntentData; |
| import org.onosproject.net.intent.impl.IntentProcessor; |
| |
| import java.util.Optional; |
| |
| import static org.onlab.util.Tools.isNullOrEmpty; |
| import static org.onosproject.net.intent.IntentState.WITHDRAWN; |
| |
| /** |
| * Represents a phase of processing an intent. |
| */ |
| public interface IntentProcessPhase { |
| |
| /** |
| * Execute the procedure represented by the instance |
| * and generates the next update instance. |
| * |
| * @return next update |
| */ |
| Optional<IntentProcessPhase> execute(); |
| |
| /** |
| * Create a starting intent process phase according to intent data this class holds. |
| * |
| * @param processor intent processor to be passed to intent process phases |
| * generated while this instance is working |
| * @param data intent data to be processed |
| * @param current intent date that is stored in the store |
| * @return starting intent process phase |
| */ |
| static IntentProcessPhase newInitialPhase(IntentProcessor processor, |
| IntentData data, IntentData current) { |
| switch (data.state()) { |
| case INSTALL_REQ: |
| return new InstallRequest(processor, data, Optional.ofNullable(current)); |
| case WITHDRAW_REQ: |
| if (current == null || isNullOrEmpty(current.installables())) { |
| return new Withdrawn(data, WITHDRAWN); |
| } else { |
| return new WithdrawRequest(processor, data, current); |
| } |
| default: |
| // illegal state |
| return new CompilingFailed(data); |
| } |
| } |
| |
| } |