| /* |
| * 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.block_app.migration; |
| |
| import java.util.Iterator; |
| |
| import org.apache.giraph.block_app.framework.AbstractBlockFactory; |
| import org.apache.giraph.block_app.framework.block.Block; |
| import org.apache.giraph.block_app.framework.block.PieceCount; |
| import org.apache.giraph.block_app.framework.block.SequenceBlock; |
| import org.apache.giraph.block_app.framework.piece.AbstractPiece; |
| import org.apache.giraph.block_app.framework.piece.Piece; |
| import org.apache.giraph.block_app.migration.MigrationAbstractComputation.MigrationFullAbstractComputation; |
| import org.apache.giraph.block_app.migration.MigrationMasterCompute.MigrationFullMasterCompute; |
| import org.apache.giraph.combiner.MessageCombiner; |
| import org.apache.giraph.conf.GiraphConfiguration; |
| import org.apache.giraph.function.Consumer; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| |
| import com.google.common.collect.AbstractIterator; |
| import com.google.common.collect.Iterators; |
| |
| /** |
| * BlockFactory to extend when using drop-in migration |
| */ |
| public abstract class MigrationFullBlockFactory |
| extends AbstractBlockFactory<MigrationSuperstepStage> { |
| |
| @Override |
| public MigrationSuperstepStage createExecutionStage( |
| GiraphConfiguration conf) { |
| return new MigrationSuperstepStageImpl(); |
| } |
| |
| @Override |
| protected Class<? extends MigrationWorkerContext> getWorkerContextValueClass( |
| GiraphConfiguration conf) { |
| return MigrationWorkerContext.class; |
| } |
| |
| @SuppressWarnings("rawtypes") |
| public <I extends WritableComparable, V extends Writable, E extends Writable, |
| MR extends Writable, MS extends Writable> |
| Block createMigrationAppBlock( |
| Class<? extends MigrationFullAbstractComputation<I, V, E, MR, MS>> |
| computationClass, |
| MigrationFullMasterCompute masterCompute, |
| Class<MS> messageClass, |
| Class<? extends MessageCombiner<? super I, MS>> messageCombinerClass, |
| GiraphConfiguration conf) { |
| final MigrationPiece<I, V, E, MR, MS> piece = |
| MigrationPiece.createFirstFullMigrationPiece( |
| computationClass, masterCompute, messageClass, |
| messageCombinerClass); |
| piece.sanityTypeChecks(conf, null); |
| |
| return new SequenceBlock( |
| new Piece<WritableComparable, Writable, Writable, |
| Writable, MigrationSuperstepStage>() { |
| @Override |
| public MigrationSuperstepStage nextExecutionStage( |
| MigrationSuperstepStage executionStage) { |
| return executionStage.changedMigrationSuperstep(0); |
| } |
| }, |
| new Block() { |
| private MigrationPiece curPiece = piece; |
| |
| @Override |
| public Iterator<AbstractPiece> iterator() { |
| return Iterators.concat( |
| Iterators.singletonIterator(curPiece), |
| new AbstractIterator<AbstractPiece>() { |
| @Override |
| protected AbstractPiece computeNext() { |
| curPiece = curPiece.getNextPiece(); |
| if (curPiece == null) { |
| endOfData(); |
| } |
| return curPiece; |
| } |
| }); |
| } |
| |
| @Override |
| public void forAllPossiblePieces(Consumer<AbstractPiece> consumer) { |
| consumer.apply(curPiece); |
| } |
| |
| @Override |
| public PieceCount getPieceCount() { |
| return curPiece.getPieceCount(); |
| } |
| } |
| ); |
| } |
| } |