| /* |
| * 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.beam.runners.spark.structuredstreaming.translation.helpers; |
| |
| import static org.apache.spark.sql.types.DataTypes.BinaryType; |
| |
| import java.io.Serializable; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Objects; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.spark.sql.Encoder; |
| import org.apache.spark.sql.Encoders; |
| import org.apache.spark.sql.catalyst.expressions.Expression; |
| import org.apache.spark.sql.catalyst.expressions.NonSQLExpression; |
| import org.apache.spark.sql.catalyst.expressions.UnaryExpression; |
| import org.apache.spark.sql.catalyst.expressions.codegen.Block; |
| import org.apache.spark.sql.catalyst.expressions.codegen.CodeGenerator; |
| import org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext; |
| import org.apache.spark.sql.catalyst.expressions.codegen.ExprCode; |
| import org.apache.spark.sql.types.DataType; |
| import org.apache.spark.sql.types.ObjectType; |
| import org.checkerframework.checker.nullness.qual.Nullable; |
| import scala.StringContext; |
| import scala.collection.JavaConversions; |
| import scala.reflect.ClassTag; |
| |
| /** {@link Encoders} utility class. */ |
| @SuppressWarnings({ |
| "nullness" // TODO(https://github.com/apache/beam/issues/20497) |
| }) |
| public class EncoderHelpers { |
| /** |
| * Wrap a Beam coder into a Spark Encoder using Catalyst Expression Encoders (which uses java code |
| * generation). |
| */ |
| public static <T> Encoder<T> fromBeamCoder(Coder<T> coder) { |
| return EncoderFactory.fromBeamCoder(coder); |
| } |
| |
| /** |
| * Catalyst Expression that serializes elements using Beam {@link Coder}. |
| * |
| * @param <T>: Type of elements ot be serialized. |
| */ |
| public static class EncodeUsingBeamCoder<T> extends UnaryExpression |
| implements NonSQLExpression, Serializable { |
| |
| private final Expression child; |
| private final Coder<T> coder; |
| |
| public EncodeUsingBeamCoder(Expression child, Coder<T> coder) { |
| this.child = child; |
| this.coder = coder; |
| } |
| |
| @Override |
| public Expression child() { |
| return child; |
| } |
| |
| @Override |
| public ExprCode doGenCode(CodegenContext ctx, ExprCode ev) { |
| String accessCode = ctx.addReferenceObj("coder", coder, coder.getClass().getName()); |
| ExprCode input = child.genCode(ctx); |
| String javaType = CodeGenerator.javaType(dataType()); |
| |
| List<String> parts = new ArrayList<>(); |
| List<Object> args = new ArrayList<>(); |
| /* |
| CODE GENERATED |
| final ${javaType} ${ev.value} = org.apache.beam.runners.spark.structuredstreaming.translation.helpers.EncoderHelpers.EncodeUsingBeamCoder.encode(${input.isNull()}, ${input.value}, ${coder}); |
| */ |
| parts.add("final "); |
| args.add(javaType); |
| parts.add(" "); |
| args.add(ev.value()); |
| parts.add( |
| " = org.apache.beam.runners.spark.structuredstreaming.translation.helpers.EncoderHelpers.EncodeUsingBeamCoder.encode("); |
| args.add(input.isNull()); |
| parts.add(", "); |
| args.add(input.value()); |
| parts.add(", "); |
| args.add(accessCode); |
| parts.add(");"); |
| |
| StringContext sc = |
| new StringContext(JavaConversions.collectionAsScalaIterable(parts).toSeq()); |
| Block code = |
| new Block.BlockHelper(sc).code(JavaConversions.collectionAsScalaIterable(args).toSeq()); |
| |
| return ev.copy(input.code().$plus(code), input.isNull(), ev.value()); |
| } |
| |
| @Override |
| public DataType dataType() { |
| return BinaryType; |
| } |
| |
| @Override |
| public Object productElement(int n) { |
| switch (n) { |
| case 0: |
| return child; |
| case 1: |
| return coder; |
| default: |
| throw new ArrayIndexOutOfBoundsException("productElement out of bounds"); |
| } |
| } |
| |
| @Override |
| public int productArity() { |
| return 2; |
| } |
| |
| @Override |
| public boolean canEqual(Object that) { |
| return (that instanceof EncodeUsingBeamCoder); |
| } |
| |
| @Override |
| public boolean equals(@Nullable Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| EncodeUsingBeamCoder<?> that = (EncodeUsingBeamCoder<?>) o; |
| return child.equals(that.child) && coder.equals(that.coder); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(super.hashCode(), child, coder); |
| } |
| |
| /** |
| * Convert value to byte array (invoked by generated code in {@link #doGenCode(CodegenContext, |
| * ExprCode)}). |
| */ |
| public static <T> byte[] encode(boolean isNull, @Nullable T value, Coder<T> coder) { |
| return isNull ? null : CoderHelpers.toByteArray(value, coder); |
| } |
| } |
| |
| /** |
| * Catalyst Expression that deserializes elements using Beam {@link Coder}. |
| * |
| * @param <T>: Type of elements ot be serialized. |
| */ |
| public static class DecodeUsingBeamCoder<T> extends UnaryExpression |
| implements NonSQLExpression, Serializable { |
| |
| private final Expression child; |
| private final ClassTag<T> classTag; |
| private final Coder<T> coder; |
| |
| public DecodeUsingBeamCoder(Expression child, ClassTag<T> classTag, Coder<T> coder) { |
| this.child = child; |
| this.classTag = classTag; |
| this.coder = coder; |
| } |
| |
| @Override |
| public Expression child() { |
| return child; |
| } |
| |
| @Override |
| public ExprCode doGenCode(CodegenContext ctx, ExprCode ev) { |
| String accessCode = ctx.addReferenceObj("coder", coder, coder.getClass().getName()); |
| ExprCode input = child.genCode(ctx); |
| String javaType = CodeGenerator.javaType(dataType()); |
| |
| List<String> parts = new ArrayList<>(); |
| List<Object> args = new ArrayList<>(); |
| /* |
| CODE GENERATED: |
| final ${javaType} ${ev.value} = (${javaType}) org.apache.beam.runners.spark.structuredstreaming.translation.helpers.EncoderHelpers.DecodeUsingBeamCoder.decode(${input.value}, ${coder}); |
| */ |
| parts.add("final "); |
| args.add(javaType); |
| parts.add(" "); |
| args.add(ev.value()); |
| parts.add(" = ("); |
| args.add(javaType); |
| parts.add( |
| ") org.apache.beam.runners.spark.structuredstreaming.translation.helpers.EncoderHelpers.DecodeUsingBeamCoder.decode("); |
| args.add(input.isNull()); |
| parts.add(", "); |
| args.add(input.value()); |
| parts.add(", "); |
| args.add(accessCode); |
| parts.add(");"); |
| |
| StringContext sc = |
| new StringContext(JavaConversions.collectionAsScalaIterable(parts).toSeq()); |
| Block code = |
| new Block.BlockHelper(sc).code(JavaConversions.collectionAsScalaIterable(args).toSeq()); |
| return ev.copy(input.code().$plus(code), input.isNull(), ev.value()); |
| } |
| |
| @Override |
| public DataType dataType() { |
| return new ObjectType(classTag.runtimeClass()); |
| } |
| |
| @Override |
| public Object productElement(int n) { |
| switch (n) { |
| case 0: |
| return child; |
| case 1: |
| return classTag; |
| case 2: |
| return coder; |
| default: |
| throw new ArrayIndexOutOfBoundsException("productElement out of bounds"); |
| } |
| } |
| |
| @Override |
| public int productArity() { |
| return 3; |
| } |
| |
| @Override |
| public boolean canEqual(Object that) { |
| return (that instanceof DecodeUsingBeamCoder); |
| } |
| |
| @Override |
| public boolean equals(@Nullable Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| DecodeUsingBeamCoder<?> that = (DecodeUsingBeamCoder<?>) o; |
| return child.equals(that.child) && classTag.equals(that.classTag) && coder.equals(that.coder); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(super.hashCode(), child, classTag, coder); |
| } |
| |
| /** |
| * Convert value from byte array (invoked by generated code in {@link #doGenCode(CodegenContext, |
| * ExprCode)}). |
| */ |
| public static <T> T decode(boolean isNull, byte @Nullable [] serialized, Coder<T> coder) { |
| return isNull ? null : CoderHelpers.fromByteArray(serialized, coder); |
| } |
| } |
| } |