Sho SHIMIZU | 662c3db | 2015-02-23 16:59:01 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2015 Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.net.intent.impl.phase; |
| 17 | |
| 18 | import org.onosproject.net.intent.IntentData; |
| 19 | import org.onosproject.net.intent.impl.IntentProcessor; |
| 20 | |
| 21 | import java.util.Optional; |
| 22 | import java.util.concurrent.Callable; |
| 23 | |
| 24 | import static com.google.common.base.Preconditions.checkNotNull; |
| 25 | import static org.onlab.util.Tools.isNullOrEmpty; |
| 26 | import static org.onosproject.net.intent.IntentState.WITHDRAWN; |
| 27 | |
| 28 | /** |
| 29 | * Worker to process a submitted intent. {@link #call()} method generates |
| 30 | */ |
| 31 | public final class IntentWorker implements Callable<FinalIntentProcessPhase> { |
| 32 | |
| 33 | private final IntentProcessor processor; |
| 34 | private final IntentData data; |
| 35 | private final IntentData current; |
| 36 | |
| 37 | /** |
| 38 | * Create an instance with the specified arguments. |
| 39 | * |
| 40 | * @param processor intent processor to be passed to intent process phases |
| 41 | * generated while this instance is working |
| 42 | * @param data intent data to be processed |
| 43 | * @param current intent date that is stored in the store |
| 44 | */ |
| 45 | public IntentWorker(IntentProcessor processor, IntentData data, IntentData current) { |
| 46 | this.processor = checkNotNull(processor); |
| 47 | this.data = checkNotNull(data); |
| 48 | this.current = current; |
| 49 | } |
| 50 | |
| 51 | @Override |
| 52 | public FinalIntentProcessPhase call() throws Exception { |
| 53 | IntentProcessPhase update = createInitialPhase(); |
| 54 | Optional<IntentProcessPhase> currentPhase = Optional.of(update); |
| 55 | IntentProcessPhase previousPhase = update; |
| 56 | |
| 57 | while (currentPhase.isPresent()) { |
| 58 | previousPhase = currentPhase.get(); |
| 59 | currentPhase = previousPhase.execute(); |
| 60 | } |
| 61 | return (FinalIntentProcessPhase) previousPhase; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Create a starting intent process phase according to intent data this class holds. |
| 66 | * |
| 67 | * @return starting intent process phase |
| 68 | */ |
| 69 | private IntentProcessPhase createInitialPhase() { |
| 70 | switch (data.state()) { |
| 71 | case INSTALL_REQ: |
| 72 | return new InstallRequest(processor, data, Optional.ofNullable(current)); |
| 73 | case WITHDRAW_REQ: |
| 74 | if (current == null || isNullOrEmpty(current.installables())) { |
| 75 | return new Withdrawn(data, WITHDRAWN); |
| 76 | } else { |
| 77 | return new WithdrawRequest(processor, data, current); |
| 78 | } |
| 79 | default: |
| 80 | // illegal state |
| 81 | return new CompilingFailed(data); |
| 82 | } |
| 83 | } |
| 84 | } |