| /* |
| * 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.ignite.internal.processors.query; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.apache.ignite.IgniteException; |
| import org.apache.ignite.cache.query.QueryCancelledException; |
| |
| /** |
| * Holds query cancel state. |
| */ |
| public class GridQueryCancel { |
| /** */ |
| private final List<QueryCancellable> cancelActions = new ArrayList<>(3); |
| |
| /** */ |
| private boolean canceled; |
| |
| /** |
| * Adds a cancel action. |
| * |
| * @param clo Clo. |
| */ |
| public synchronized void add(QueryCancellable clo) throws QueryCancelledException { |
| assert clo != null; |
| |
| if (canceled) |
| throw new QueryCancelledException(); |
| |
| cancelActions.add(clo); |
| } |
| |
| /** |
| * Executes cancel closure. |
| */ |
| public synchronized void cancel() { |
| if (canceled) |
| return; |
| |
| canceled = true; |
| |
| IgniteException ex = null; |
| |
| // Run actions in the reverse order. |
| for (int i = cancelActions.size() - 1; i >= 0; i--) { |
| try { |
| QueryCancellable act = cancelActions.get(i); |
| |
| act.doCancel(); |
| } |
| catch (Exception e) { |
| if (ex == null) |
| ex = new IgniteException(e); |
| else |
| ex.addSuppressed(e); |
| } |
| } |
| |
| if (ex != null) |
| throw ex; |
| } |
| |
| /** |
| * Stops query execution if a user requested cancel. |
| */ |
| public synchronized void checkCancelled() throws QueryCancelledException { |
| if (canceled) |
| throw new QueryCancelledException(); |
| } |
| } |