| /* |
| * 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.visor; |
| |
| import org.apache.ignite.compute.*; |
| import org.apache.ignite.internal.util.typedef.*; |
| import org.jetbrains.annotations.*; |
| |
| import java.util.*; |
| |
| /** |
| * Base class for Visor tasks intended to query data from a single node. |
| */ |
| public abstract class VisorOneNodeTask<A, R> extends VisorMultiNodeTask<A, R, R> { |
| /** {@inheritDoc} */ |
| @Nullable @Override protected R reduce0(List<ComputeJobResult> results) { |
| assert results.size() == 1; |
| |
| ComputeJobResult res = F.first(results); |
| |
| if (res.getException() == null) |
| return res.getData(); |
| |
| throw res.getException(); |
| } |
| } |