| /* |
| * Copyright 2009-2013 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.pregelix.core.jobgen; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.WritableComparator; |
| |
| import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory; |
| import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory; |
| import edu.uci.ics.pregelix.api.graph.NormalizedKeyComputer; |
| import edu.uci.ics.pregelix.api.util.BspUtils; |
| import edu.uci.ics.pregelix.core.runtime.touchpoint.RawBinaryComparatorFactory; |
| import edu.uci.ics.pregelix.core.runtime.touchpoint.RawNormalizedKeyComputerFactory; |
| import edu.uci.ics.pregelix.core.runtime.touchpoint.WritableComparingBinaryComparatorFactory; |
| import edu.uci.ics.pregelix.runtime.touchpoint.VertexIdNormalizedKeyComputerFactory; |
| |
| @SuppressWarnings({ "rawtypes" }) |
| public class JobGenUtil { |
| |
| /** |
| * get normalized key factory for an iteration, to sort messages iteration |
| * 1: asc order iteration 2: desc order |
| * |
| * @param iteration |
| * @param keyClass |
| * @return |
| */ |
| public static INormalizedKeyComputerFactory getINormalizedKeyComputerFactory(Configuration conf) { |
| return RawNormalizedKeyComputerFactory.INSTANCE; |
| } |
| |
| /** |
| * get comparator for an iteration, to sort messages iteration 1: asc order |
| * iteration 0: desc order |
| * |
| * @param iteration |
| * @param keyClass |
| * @return |
| */ |
| public static IBinaryComparatorFactory getIBinaryComparatorFactory(int iteration, Class keyClass) { |
| return RawBinaryComparatorFactory.INSTANCE; |
| } |
| |
| /** |
| * get normalized key factory for the final output job |
| * |
| * @param iteration |
| * @param keyClass |
| * @return |
| */ |
| public static INormalizedKeyComputerFactory getFinalNormalizedKeyComputerFactory(Configuration conf) { |
| Class<? extends NormalizedKeyComputer> clazz = BspUtils.getNormalizedKeyComputerClass(conf); |
| if (clazz.equals(NormalizedKeyComputer.class)) { |
| return null; |
| } |
| return new VertexIdNormalizedKeyComputerFactory(clazz); |
| } |
| |
| /** |
| * get comparator for the final output job |
| * |
| * @param iteration |
| * @param keyClass |
| * @return |
| */ |
| @SuppressWarnings("unchecked") |
| public static IBinaryComparatorFactory getFinalBinaryComparatorFactory(Class vertexIdClass) { |
| return new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass).getClass()); |
| } |
| |
| /** |
| * get the B-tree scan order for an iteration iteration 1: desc order, |
| * backward scan iteration 2: asc order, forward scan |
| * |
| * @param iteration |
| * @return |
| */ |
| public static boolean getForwardScan(int iteration) { |
| return true; |
| } |
| |
| } |