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Using `GenericData` (or subclasses) with `RandomData` allows to generate `GenericRecord`, `SpecificRecord` and reflected records as random data.
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lang/java/avro/src/test/java/org/apache/avro/util/TestRandomData.java
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| /* | ||
| * 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 | ||
| * | ||
| * https://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.avro.util; | ||
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| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.nio.file.Files; | ||
| import java.util.Objects; | ||
| import java.util.Random; | ||
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| import org.apache.avro.Schema; | ||
| import org.apache.avro.file.DataFileReader; | ||
| import org.apache.avro.file.DataFileWriter; | ||
| import org.apache.avro.generic.GenericData; | ||
| import org.apache.avro.reflect.ReflectData; | ||
| import org.apache.avro.specific.SpecificData; | ||
| import org.apache.avro.specific.SpecificRecordBase; | ||
| import org.junit.Before; | ||
| import org.junit.Test; | ||
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| import static org.junit.Assert.assertEquals; | ||
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| public class TestRandomData { | ||
| private long seed; | ||
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| private int count; | ||
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| private File file; | ||
| private GenericData genericData; | ||
| private SpecificData specificData; | ||
| private Schema specificSchema; | ||
| private ReflectData reflectData; | ||
| private Schema reflectedSchema; | ||
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| @Before | ||
| public void setUp() throws Exception { | ||
| file = Files.createTempFile("randomData", ".avro").toFile(); | ||
| seed = System.currentTimeMillis(); | ||
| count = new Random().nextInt(50) + 75; | ||
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| genericData = GenericData.get(); | ||
| specificData = SpecificData.get(); | ||
| specificSchema = specificData.getSchema(SpecificTestRecord.class); | ||
| reflectData = ReflectData.get(); | ||
| reflectedSchema = reflectData.getSchema(ReflectTestRecord.class); | ||
| } | ||
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| @Test | ||
| public void testRandomDataFromGenericToGeneric() throws IOException { | ||
| checkWrite(genericData, TEST_SCHEMA); | ||
| checkRead(genericData, TEST_SCHEMA); | ||
| } | ||
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| @Test | ||
| public void testRandomDataFromGenericToSpecific() throws IOException { | ||
| checkWrite(genericData, TEST_SCHEMA); | ||
| checkRead(specificData, specificSchema); | ||
| } | ||
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| @Test | ||
| public void testRandomDataFromGenericToReflected() throws IOException { | ||
| checkWrite(genericData, TEST_SCHEMA); | ||
| checkRead(reflectData, reflectedSchema); | ||
| } | ||
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| @Test | ||
| public void testRandomDataFromSpecificToGeneric() throws IOException { | ||
| checkWrite(specificData, specificSchema); | ||
| checkRead(genericData, TEST_SCHEMA); | ||
| } | ||
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| @Test | ||
| public void testRandomDataFromSpecificToSpecific() throws IOException { | ||
| checkWrite(specificData, specificSchema); | ||
| checkRead(specificData, specificSchema); | ||
| } | ||
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| @Test | ||
| public void testRandomDataFromSpecificToReflected() throws IOException { | ||
| checkWrite(specificData, specificSchema); | ||
| checkRead(reflectData, reflectedSchema); | ||
| } | ||
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| @Test | ||
| public void testRandomDataFromReflectedToGeneric() throws IOException { | ||
| checkWrite(reflectData, reflectedSchema); | ||
| checkRead(genericData, TEST_SCHEMA); | ||
| } | ||
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| @Test | ||
| public void testRandomDataFromReflectedToSpecific() throws IOException { | ||
| checkWrite(reflectData, reflectedSchema); | ||
| checkRead(specificData, specificSchema); | ||
| } | ||
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| @Test | ||
| public void testRandomDataFromReflectedToReflected() throws IOException { | ||
| checkWrite(reflectData, reflectedSchema); | ||
| checkRead(reflectData, reflectedSchema); | ||
| } | ||
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| private void checkWrite(GenericData genericData, Schema schema) throws IOException { | ||
| // noinspection unchecked | ||
| try (DataFileWriter<Object> writer = new DataFileWriter<Object>(genericData.createDatumWriter(schema))) { | ||
| writer.create(schema, file); | ||
| for (Object datum : new RandomData(genericData, schema, this.count, seed)) { | ||
| writer.append(datum); | ||
| } | ||
| } | ||
| } | ||
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| private void checkRead(GenericData genericData, Schema schema) throws IOException { | ||
| // noinspection unchecked | ||
| try (DataFileReader<Object> reader = new DataFileReader<Object>(file, genericData.createDatumReader(schema))) { | ||
| for (Object expected : new RandomData(genericData, schema, this.count, seed)) { | ||
| assertEquals(expected, reader.next()); | ||
| } | ||
| } | ||
| } | ||
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| /* | ||
| * Test classes: they implement the same schema, but one is a SpecificRecord and | ||
| * the other uses a reflected schema. | ||
| */ | ||
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| public static final String TEST_SCHEMA_JSON = "{\"type\":\"record\",\"name\":\"Record\",\"fields\":[{\"name\":\"x\",\"type\":\"int\"},{\"name\":\"y\",\"type\":{\"type\":\"string\",\"avro.java.string\":\"String\"}}]}"; | ||
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| public static final Schema TEST_SCHEMA = new Schema.Parser().parse(TEST_SCHEMA_JSON); | ||
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| public static class SpecificTestRecord extends SpecificRecordBase { | ||
| public static final Schema SCHEMA$ = new Schema.Parser().parse(TEST_SCHEMA_JSON.replace("\"name\":\"Record\"", | ||
| "\"name\":\"" + SpecificTestRecord.class.getCanonicalName() + "\"")); | ||
| private int x; | ||
| private String y; | ||
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| @Override | ||
| public Schema getSchema() { | ||
| return SCHEMA$; | ||
| } | ||
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| @Override | ||
| public void put(int i, Object v) { | ||
| switch (i) { | ||
| case 0: | ||
| x = (Integer) v; | ||
| break; | ||
| case 1: | ||
| y = (String) v; | ||
| break; | ||
| default: | ||
| throw new RuntimeException(); | ||
| } | ||
| } | ||
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| @Override | ||
| public Object get(int i) { | ||
| switch (i) { | ||
| case 0: | ||
| return x; | ||
| case 1: | ||
| return y; | ||
| } | ||
| throw new RuntimeException(); | ||
| } | ||
| } | ||
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| public static class ReflectTestRecord { | ||
| private int x; | ||
| private String y; | ||
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| public int getX() { | ||
| return x; | ||
| } | ||
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| public void setX(int x) { | ||
| this.x = x; | ||
| } | ||
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| public String getY() { | ||
| return y; | ||
| } | ||
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| public void setY(String y) { | ||
| this.y = y; | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) { | ||
| return true; | ||
| } | ||
| if (o == null || getClass() != o.getClass()) { | ||
| return false; | ||
| } | ||
| ReflectTestRecord that = (ReflectTestRecord) o; | ||
| return x == that.x && Objects.equals(y, that.y); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(x, y); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return String.format("{\"x\": %d, \"y\": \"%s\"}", x, y); | ||
| } | ||
| } | ||
| } |