| /* |
| * 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.asterix.transaction.management.service.locking; |
| |
| /** |
| * @author pouria |
| * Shows: - The conflict matrix for the locking protocol (whether two |
| * lock modes conflict with each other or not on a single resource) - |
| * Whether request to convert a lock mode to a new one is a conversion |
| * (i.e. the new lock mode is stringer than the current one) or not |
| * Each lock mode is shown/interpreted as an integer |
| */ |
| |
| public interface ILockMatrix { |
| |
| /** |
| * @param mask |
| * (current/expected) lock mask on the resource |
| * @param reqLockMode |
| * index of the requested lockMode |
| * @return true if the lock request conflicts with the mask |
| */ |
| public boolean conflicts(int mask, int reqLockMode); |
| |
| /** |
| * @param currentLockMode |
| * @param reqLockMode |
| * @return true if the request is a conversion |
| */ |
| public boolean isConversion(int currentLockMode, int reqLockMode); |
| |
| } |
