| /* |
| * 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.core.function; |
| |
| import java.io.Serializable; |
| import java.util.Optional; |
| import java.util.function.BiFunction; |
| import java.util.function.BinaryOperator; |
| import java.util.function.Consumer; |
| import java.util.function.Function; |
| import java.util.function.Predicate; |
| import org.apache.wayang.core.optimizer.ProbabilisticDoubleInterval; |
| import org.apache.wayang.core.optimizer.costs.LoadEstimator; |
| import org.apache.wayang.core.optimizer.costs.LoadProfileEstimator; |
| import org.apache.wayang.core.optimizer.costs.NestableLoadProfileEstimator; |
| |
| /** |
| * A function operates on single data units or collections of those. |
| */ |
| public abstract class FunctionDescriptor { |
| |
| private LoadProfileEstimator loadProfileEstimator; |
| |
| public FunctionDescriptor(LoadProfileEstimator loadProfileEstimator) { |
| this.setLoadProfileEstimator(loadProfileEstimator); |
| } |
| |
| public void setLoadProfileEstimator(LoadProfileEstimator loadProfileEstimator) { |
| this.loadProfileEstimator = loadProfileEstimator; |
| } |
| |
| public Optional<LoadProfileEstimator> getLoadProfileEstimator() { |
| return Optional.ofNullable(this.loadProfileEstimator); |
| } |
| |
| /** |
| * Utility method to retrieve the selectivity of a {@link FunctionDescriptor} |
| * |
| * @param functionDescriptor either a {@link PredicateDescriptor}, a {@link FlatMapDescriptor}, or a {@link MapPartitionsDescriptor} |
| * @return the selectivity |
| */ |
| public static Optional<ProbabilisticDoubleInterval> getSelectivity(FunctionDescriptor functionDescriptor) { |
| if (functionDescriptor == null) throw new NullPointerException(); |
| if (functionDescriptor instanceof PredicateDescriptor) { |
| return ((PredicateDescriptor<?>) functionDescriptor).getSelectivity(); |
| } |
| if (functionDescriptor instanceof FlatMapDescriptor) { |
| return ((FlatMapDescriptor<?, ?>) functionDescriptor).getSelectivity(); |
| } |
| if (functionDescriptor instanceof MapPartitionsDescriptor) { |
| return ((MapPartitionsDescriptor<?, ?>) functionDescriptor).getSelectivity(); |
| } |
| throw new IllegalArgumentException(String.format("Cannot retrieve selectivity of %s.", functionDescriptor)); |
| } |
| |
| /** |
| * Updates the {@link LoadProfileEstimator} of this instance. |
| * |
| * @param cpuEstimator the {@link LoadEstimator} for the CPU load |
| * @param ramEstimator the {@link LoadEstimator} for the RAM load |
| * @deprecated Use {@link #setLoadProfileEstimator(LoadProfileEstimator)} instead. |
| */ |
| public void setLoadEstimators(LoadEstimator cpuEstimator, LoadEstimator ramEstimator) { |
| this.setLoadProfileEstimator(new NestableLoadProfileEstimator( |
| cpuEstimator, |
| ramEstimator |
| )); |
| } |
| |
| /** |
| * Decorates the default {@link Function} with {@link Serializable}, which is required by some distributed frameworks. |
| */ |
| @FunctionalInterface |
| public interface SerializableFunction<Input, Output> extends Function<Input, Output>, Serializable { |
| } |
| |
| /** |
| * Decorates the default {@link Function} with {@link Serializable}, which is required by some distributed frameworks. |
| */ |
| @FunctionalInterface |
| public interface SerializableBiFunction<Input0, Input1, Output> extends BiFunction<Input0, Input1, Output>, Serializable { |
| } |
| |
| |
| /** |
| * Extends a {@link SerializableFunction} to an {@link ExtendedFunction}. |
| */ |
| public interface ExtendedSerializableFunction<Input, Output> extends SerializableFunction<Input, Output>, ExtendedFunction { |
| } |
| |
| /** |
| * Decorates the default {@link Function} with {@link Serializable}, which is required by some distributed frameworks. |
| */ |
| @FunctionalInterface |
| public interface SerializableBinaryOperator<Type> extends BinaryOperator<Type>, Serializable { |
| } |
| |
| /** |
| * Extends a {@link SerializableBinaryOperator} to an {@link ExtendedFunction}. |
| */ |
| public interface ExtendedSerializableBinaryOperator<Type> extends SerializableBinaryOperator<Type>, ExtendedFunction { |
| } |
| |
| @FunctionalInterface |
| public interface SerializablePredicate<T> extends Predicate<T>, Serializable { |
| |
| } |
| |
| public interface ExtendedSerializablePredicate<T> extends SerializablePredicate<T>, ExtendedFunction { |
| |
| } |
| |
| /** |
| * Decorates the default {@link Consumer} with {@link Serializable}, which is required by some distributed frameworks. |
| */ |
| @FunctionalInterface |
| public interface SerializableConsumer<T> extends Consumer<T>, Serializable { |
| |
| } |
| /** |
| * Extends a {@link SerializableConsumer} to an {@link ExtendedFunction}. |
| */ |
| public interface ExtendedSerializableConsumer<T> extends SerializableConsumer<T>, ExtendedFunction{ |
| |
| } |
| } |