| /* |
| * 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.giraph.factories; |
| |
| import org.apache.giraph.conf.GiraphConfiguration; |
| import org.apache.giraph.conf.GiraphConstants; |
| import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration; |
| import org.apache.giraph.graph.Computation; |
| import org.apache.giraph.utils.ReflectionUtils; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| |
| /** |
| * Default computation factory that simply creates java computation object |
| * |
| * @param <I> Vertex ID |
| * @param <V> Vertex Value |
| * @param <E> Edge Value |
| */ |
| public class DefaultComputationFactory<I extends WritableComparable, |
| V extends Writable, E extends Writable> |
| implements ComputationFactory<I, V, E, Writable, Writable> { |
| @Override |
| public void initialize(ImmutableClassesGiraphConfiguration<I, V, E> conf) { |
| // Nothing to do here |
| } |
| |
| @Override |
| public Computation<I, V, E, Writable, Writable> createComputation( |
| ImmutableClassesGiraphConfiguration<I, V, E> conf) { |
| Class<? extends Computation> klass = conf.getComputationClass(); |
| return ReflectionUtils.newInstance(klass, conf); |
| } |
| |
| @Override |
| public void checkConfiguration( |
| ImmutableClassesGiraphConfiguration<I, V, E> conf) { |
| if (conf.getComputationClass() == null) { |
| throw new IllegalArgumentException("checkConfiguration: Null " + |
| GiraphConstants.COMPUTATION_CLASS.getKey()); |
| } |
| } |
| |
| @Override |
| public String computationName(GiraphConfiguration conf) { |
| return conf.getComputationClass().getSimpleName(); |
| } |
| } |