| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.livy.rsc.driver; |
| |
| import java.util.*; |
| |
| import com.fasterxml.jackson.annotation.JsonValue; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public enum StatementState { |
| Waiting("waiting"), |
| Running("running"), |
| Available("available"), |
| Cancelling("cancelling"), |
| Cancelled("cancelled"); |
| |
| private static final Logger LOG = LoggerFactory.getLogger(StatementState.class); |
| |
| private final String state; |
| |
| StatementState(final String text) { |
| this.state = text; |
| } |
| |
| @JsonValue |
| @Override |
| public String toString() { |
| return state; |
| } |
| |
| public boolean isOneOf(StatementState... states) { |
| for (StatementState s : states) { |
| if (s == this) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private static final Map<StatementState, List<StatementState>> PREDECESSORS; |
| |
| static void put(StatementState key, |
| Map<StatementState, List<StatementState>> map, |
| StatementState... values) { |
| map.put(key, Collections.unmodifiableList(Arrays.asList(values))); |
| } |
| |
| static { |
| final Map<StatementState, List<StatementState>> predecessors = |
| new EnumMap<>(StatementState.class); |
| put(Waiting, predecessors); |
| put(Running, predecessors, Waiting); |
| put(Available, predecessors, Running); |
| put(Cancelling, predecessors, Running); |
| put(Cancelled, predecessors, Waiting, Cancelling); |
| |
| PREDECESSORS = Collections.unmodifiableMap(predecessors); |
| } |
| |
| static boolean isValid(StatementState from, StatementState to) { |
| return PREDECESSORS.get(to).contains(from); |
| } |
| |
| static void validate(StatementState from, StatementState to) { |
| LOG.debug("{} -> {}", from, to); |
| if (!isValid(from, to)) { |
| throw new IllegalStateException("Illegal Transition: " + from + " -> " + to); |
| } |
| } |
| } |