| /* |
| * 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.wayang.spark.execution; |
| |
| import java.io.Serializable; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.apache.spark.broadcast.Broadcast; |
| import org.apache.wayang.core.api.exception.WayangException; |
| import org.apache.wayang.core.function.ExecutionContext; |
| import org.apache.wayang.core.plan.wayangplan.InputSlot; |
| import org.apache.wayang.core.platform.ChannelInstance; |
| import org.apache.wayang.spark.channels.BroadcastChannel; |
| import org.apache.wayang.spark.operators.SparkExecutionOperator; |
| import org.apache.wayang.spark.platform.SparkPlatform; |
| |
| /** |
| * {@link ExecutionContext} implementation for the {@link SparkPlatform}. |
| */ |
| public class SparkExecutionContext implements ExecutionContext, Serializable { |
| |
| /** |
| * Iteration number of the execution. |
| */ |
| private int iterationNumber; |
| |
| /** |
| * Mapping of broadcast name to {@link Broadcast} references. |
| */ |
| private Map<String, Broadcast<?>> broadcasts; |
| |
| /** |
| * Creates a new instance. |
| * |
| * @param operator {@link SparkExecutionOperator} for that the instance should be created |
| * @param inputs {@link ChannelInstance} inputs for the {@code operator} |
| */ |
| public SparkExecutionContext(SparkExecutionOperator operator, ChannelInstance[] inputs, int iterationNumber) { |
| this.broadcasts = new HashMap<>(); |
| for (int inputIndex = 0; inputIndex < operator.getNumInputs(); inputIndex++) { |
| InputSlot<?> inputSlot = operator.getInput(inputIndex); |
| if (inputSlot.isBroadcast()) { |
| final BroadcastChannel.Instance broadcastChannelInstance = (BroadcastChannel.Instance) inputs[inputIndex]; |
| this.broadcasts.put(inputSlot.getName(), broadcastChannelInstance.provideBroadcast()); |
| } |
| } |
| this.iterationNumber = iterationNumber; |
| } |
| |
| /** |
| * Creates a new instance. |
| */ |
| public SparkExecutionContext(int iterationNumber) { |
| this.iterationNumber = iterationNumber; |
| } |
| |
| /** |
| * For serialization purposes. |
| */ |
| @SuppressWarnings("unused") |
| private SparkExecutionContext() { |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public <T> Collection<T> getBroadcast(String name) { |
| final Broadcast<?> broadcast = this.broadcasts.get(name); |
| if (broadcast == null) { |
| throw new WayangException("No such broadcast found: " + name); |
| } |
| |
| return (Collection<T>) broadcast.getValue(); |
| } |
| |
| @Override |
| public int getCurrentIteration() { |
| return this.iterationNumber; |
| } |
| } |