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74 changes: 74 additions & 0 deletions
74
sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/ToJson.java
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|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| /* | ||
| * 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.transforms; | ||
|
|
||
| import static org.apache.beam.sdk.util.RowJsonUtils.newObjectMapperWith; | ||
| import static org.apache.beam.sdk.util.RowJsonUtils.rowToJson; | ||
|
|
||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import javax.annotation.Nullable; | ||
| import org.apache.beam.sdk.annotations.Experimental; | ||
| import org.apache.beam.sdk.schemas.Schema; | ||
| import org.apache.beam.sdk.util.RowJsonSerializer; | ||
| import org.apache.beam.sdk.values.PCollection; | ||
| import org.apache.beam.sdk.values.Row; | ||
|
|
||
| /** | ||
| * <i>Experimental</i> | ||
| * | ||
| * <p>Creates a {@link PTransform} that serializes UTF-8 JSON objects from a {@link Schema}-aware | ||
| * PCollection (i.e. {@link PCollection#hasSchema()} returns true). JSON format is compatible with | ||
| * {@link JsonToRow}. | ||
| * | ||
| * <p>For specifics of JSON serialization see {@link RowJsonSerializer}. | ||
| */ | ||
| @Experimental | ||
| public class ToJson<T> extends PTransform<PCollection<T>, PCollection<String>> { | ||
| private transient volatile @Nullable ObjectMapper objectMapper; | ||
|
|
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| static <T> ToJson<T> of() { | ||
| return new ToJson<T>(); | ||
| } | ||
|
|
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| @Override | ||
| public PCollection<String> expand(PCollection<T> rows) { | ||
| Schema inputSchema = rows.getSchema(); | ||
| SerializableFunction<T, Row> toRow = rows.getToRowFunction(); | ||
| return rows.apply( | ||
| ParDo.of( | ||
| new DoFn<T, String>() { | ||
| @ProcessElement | ||
| public void processElement(ProcessContext context) { | ||
| context.output( | ||
| rowToJson(objectMapper(inputSchema), toRow.apply(context.element()))); | ||
| } | ||
| })); | ||
| } | ||
|
|
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| private ObjectMapper objectMapper(Schema schema) { | ||
| if (this.objectMapper == null) { | ||
| synchronized (this) { | ||
| if (this.objectMapper == null) { | ||
| this.objectMapper = newObjectMapperWith(RowJsonSerializer.forSchema(schema)); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return this.objectMapper; | ||
| } | ||
| } |
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95 changes: 95 additions & 0 deletions
95
sdks/java/core/src/test/java/org/apache/beam/sdk/transforms/ToJsonTest.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,95 @@ | ||
| /* | ||
| * 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.transforms; | ||
|
|
||
| import com.google.auto.value.AutoValue; | ||
| import java.io.Serializable; | ||
| import org.apache.beam.sdk.schemas.AutoValueSchema; | ||
| import org.apache.beam.sdk.schemas.Schema; | ||
| import org.apache.beam.sdk.schemas.annotations.DefaultSchema; | ||
| import org.apache.beam.sdk.testing.NeedsRunner; | ||
| import org.apache.beam.sdk.testing.PAssert; | ||
| import org.apache.beam.sdk.testing.TestPipeline; | ||
| import org.apache.beam.sdk.testing.UsesSchema; | ||
| import org.apache.beam.sdk.values.PCollection; | ||
| import org.apache.beam.sdk.values.Row; | ||
| import org.junit.Rule; | ||
| import org.junit.Test; | ||
| import org.junit.experimental.categories.Category; | ||
| import org.junit.runner.RunWith; | ||
| import org.junit.runners.JUnit4; | ||
|
|
||
| /** Unit tests for {@link JsonToRow}. */ | ||
| @RunWith(JUnit4.class) | ||
| @Category(UsesSchema.class) | ||
| public class ToJsonTest implements Serializable { | ||
|
|
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| @Rule public transient TestPipeline pipeline = TestPipeline.create(); | ||
|
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| @DefaultSchema(AutoValueSchema.class) | ||
| @AutoValue | ||
| abstract static class Person { | ||
| public static Person of(String name, Integer height, Boolean knowsJavascript) { | ||
| return new AutoValue_ToJsonTest_Person(name, height, knowsJavascript); | ||
| } | ||
|
|
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| public abstract String getName(); | ||
|
|
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| public abstract Integer getHeight(); | ||
|
|
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| public abstract Boolean getKnowsJavascript(); | ||
| } | ||
|
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| @Test | ||
| @Category(NeedsRunner.class) | ||
| public void testSerializesParseableJson() throws Exception { | ||
| PCollection<Person> persons = | ||
| pipeline.apply( | ||
| "jsonPersons", | ||
| Create.of( | ||
| Person.of("person1", 80, true), | ||
| Person.of("person2", 70, false), | ||
| Person.of("person3", 60, true), | ||
| Person.of("person4", 50, false), | ||
| Person.of("person5", 40, true))); | ||
|
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| Schema personSchema = | ||
| Schema.builder() | ||
| .addStringField("name") | ||
| .addInt32Field("height") | ||
| .addBooleanField("knowsJavascript") | ||
| .build(); | ||
|
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| PCollection<Row> personRows = | ||
| persons.apply(ToJson.of()).apply(JsonToRow.withSchema(personSchema)); | ||
|
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| PAssert.that(personRows) | ||
| .containsInAnyOrder( | ||
| row(personSchema, "person1", 80, true), | ||
| row(personSchema, "person2", 70, false), | ||
| row(personSchema, "person3", 60, true), | ||
| row(personSchema, "person4", 50, false), | ||
| row(personSchema, "person5", 40, true)); | ||
|
|
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| pipeline.run(); | ||
| } | ||
|
|
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| private Row row(Schema schema, Object... values) { | ||
| return Row.withSchema(schema).addValues(values).build(); | ||
| } | ||
| } |
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