[
https://issues.apache.org/jira/browse/BEAM-4453?focusedWorklogId=120047&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-120047
]
ASF GitHub Bot logged work on BEAM-4453:
----------------------------------------
Author: ASF GitHub Bot
Created on: 06/Jul/18 21:19
Start Date: 06/Jul/18 21:19
Worklog Time Spent: 10m
Work Description: apilloud commented on a change in pull request #5873:
[BEAM-4453] Add schema support for Java POJOs and Java Beans
URL: https://github.com/apache/beam/pull/5873#discussion_r200739701
##########
File path:
sdks/java/core/src/main/java/org/apache/beam/sdk/schemas/utils/JavaBeanUtils.java
##########
@@ -0,0 +1,335 @@
+/*
+ * 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.sdk.schemas.utils;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import net.bytebuddy.ByteBuddy;
+import net.bytebuddy.description.method.MethodDescription.ForLoadedMethod;
+import net.bytebuddy.dynamic.DynamicType;
+import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
+import net.bytebuddy.dynamic.scaffold.InstrumentedType;
+import net.bytebuddy.implementation.FixedValue;
+import net.bytebuddy.implementation.Implementation;
+import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
+import net.bytebuddy.implementation.bytecode.ByteCodeAppender.Size;
+import net.bytebuddy.implementation.bytecode.StackManipulation;
+import net.bytebuddy.implementation.bytecode.member.MethodInvocation;
+import net.bytebuddy.implementation.bytecode.member.MethodReturn;
+import net.bytebuddy.implementation.bytecode.member.MethodVariableAccess;
+import net.bytebuddy.matcher.ElementMatchers;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.annotations.Experimental.Kind;
+import org.apache.beam.sdk.schemas.Schema;
+import org.apache.beam.sdk.schemas.utils.ByteBuddyUtils.ConvertType;
+import org.apache.beam.sdk.schemas.utils.ByteBuddyUtils.ConvertValueForGetter;
+import org.apache.beam.sdk.schemas.utils.ReflectUtils.ClassWithSchema;
+import org.apache.beam.sdk.schemas.utils.StaticSchemaInference.MethodType;
+import org.apache.beam.sdk.schemas.utils.StaticSchemaInference.TypeInformation;
+import org.apache.beam.sdk.values.reflect.FieldValueGetter;
+import org.apache.beam.sdk.values.reflect.FieldValueSetter;
+
+/** A set of utilities yo generate getter and setter classes for JavaBean
objects. */
+@Experimental(Kind.SCHEMAS)
+public class JavaBeanUtils {
+ /** Create a {@link Schema} for a Java Bean class. */
+ public static Schema schemaFromJavaBeanClass(Class<?> clazz) {
+ return StaticSchemaInference.schemaFromClass(clazz,
JavaBeanUtils::typeInformationFromClass);
+ }
+
+ private static List<TypeInformation> typeInformationFromClass(Class<?>
clazz) {
+ try {
+ List<TypeInformation> getterTypes =
+ ReflectUtils.getMethods(clazz)
+ .stream()
+ .filter(ReflectUtils::isGetter)
+ .map(m -> new TypeInformation(m, MethodType.GETTER))
+ .collect(Collectors.toList());
+
+ Map<String, TypeInformation> setterTypes =
+ ReflectUtils.getMethods(clazz)
+ .stream()
+ .filter(ReflectUtils::isSetter)
+ .map(m -> new TypeInformation(m, MethodType.SETTER))
+ .collect(Collectors.toMap(TypeInformation::getName,
Function.identity()));
+ validateJavaBean(getterTypes, setterTypes);
+ return getterTypes;
+ } catch (IOException e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ // Make sure that there are matching setters and getters.
+ private static void validateJavaBean(
+ List<TypeInformation> getters, Map<String, TypeInformation> setters) {
+ for (TypeInformation type : getters) {
+ TypeInformation setterType = setters.get(type.getName());
+ if (setterType == null) {
+ throw new RuntimeException(
+ "JavaBean contained a setter for field "
+ + type.getName()
+ + "but did not contain a matching getter.");
+ }
+ if (!type.equals(setterType)) {
+ throw new RuntimeException(
+ "JavaBean contained mismatching setter for field" +
type.getName());
+ }
+ }
+ }
+
+ // Static ByteBuddy instance used by all helpers.
+ private static final ByteBuddy BYTE_BUDDY = new ByteBuddy();
+
+ // The list of getters for a class is cached, so we only create the classes
the first time
+ // getSetters is called.
+ private static final Map<ClassWithSchema, List<FieldValueGetter>>
CACHED_GETTERS =
+ Maps.newConcurrentMap();
+
+ /**
+ * Return the list of {@link FieldValueGetter}s for a Java Bean class
+ *
+ * <p>The returned list is ordered by the order of fields in the schema.
+ */
+ public static List<FieldValueGetter> getGetters(Class<?> clazz, Schema
schema) {
+ return CACHED_GETTERS.computeIfAbsent(
+ new ClassWithSchema(clazz, schema),
+ c -> {
+ try {
+ Map<String, FieldValueGetter> getterMap =
+ ReflectUtils.getMethods(clazz)
+ .stream()
+ .filter(ReflectUtils::isGetter)
+ .map(JavaBeanUtils::createGetter)
+ .collect(Collectors.toMap(FieldValueGetter::name,
Function.identity()));
+ List<FieldValueGetter> getters = Lists.newArrayList();
+ for (int i = 0; i < schema.getFieldCount(); ++i) {
+ getters.add(getterMap.get(schema.getField(i).getName()));
+ }
+ System.out.println("Returning for Schema " + schema + " getters "
+ getters);
Review comment:
Remove printf
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Issue Time Tracking
-------------------
Worklog Id: (was: 120047)
Time Spent: 1h 40m (was: 1.5h)
> Provide automatic schema registration for POJOs
> -----------------------------------------------
>
> Key: BEAM-4453
> URL: https://issues.apache.org/jira/browse/BEAM-4453
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-java-core
> Reporter: Reuven Lax
> Assignee: Reuven Lax
> Priority: Major
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
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