flink-core/src/test/java/org/apache/flink/api/common/state/ValueStateDescriptorTest.java

/*
 * 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.flink.api.common.state;

import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.base.StringSerializer;
import org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer;
import org.apache.flink.configuration.ConfigConstants;
import org.apache.flink.core.testutils.CommonTestUtils;
import org.apache.flink.util.TestLogger;

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

/**
 * Tests for the {@link ValueStateDescriptor}.
 */
public class ValueStateDescriptorTest extends TestLogger {

	@Test
	public void testHashCodeEquals() throws Exception {
		final String name = "testName";

		ValueStateDescriptor<String> original = new ValueStateDescriptor<>(name, String.class);
		ValueStateDescriptor<String> same = new ValueStateDescriptor<>(name, String.class);
		ValueStateDescriptor<String> sameBySerializer = new ValueStateDescriptor<>(name, StringSerializer.INSTANCE);

		// test that hashCode() works on state descriptors with initialized and uninitialized serializers
		assertEquals(original.hashCode(), same.hashCode());
		assertEquals(original.hashCode(), sameBySerializer.hashCode());

		assertEquals(original, same);
		assertEquals(original, sameBySerializer);

		// equality with a clone
		ValueStateDescriptor<String> clone = CommonTestUtils.createCopySerializable(original);
		assertEquals(original, clone);

		// equality with an initialized
		clone.initializeSerializerUnlessSet(new ExecutionConfig());
		assertEquals(original, clone);

		original.initializeSerializerUnlessSet(new ExecutionConfig());
		assertEquals(original, same);
	}

	@Test
	public void testVeryLargeDefaultValue() throws Exception {
		// ensure that we correctly read very large data when deserializing the default value

		TypeSerializer<String> serializer = new KryoSerializer<>(String.class, new ExecutionConfig());
		byte[] data = new byte[200000];
		for (int i = 0; i < 200000; i++) {
			data[i] = 65;
		}
		data[199000] = '\0';

		String defaultValue = new String(data, ConfigConstants.DEFAULT_CHARSET);

		ValueStateDescriptor<String> descr =
				new ValueStateDescriptor<>("testName", serializer, defaultValue);

		assertEquals("testName", descr.getName());
		assertEquals(defaultValue, descr.getDefaultValue());
		assertNotNull(descr.getSerializer());
		assertEquals(serializer, descr.getSerializer());

		ValueStateDescriptor<String> copy = CommonTestUtils.createCopySerializable(descr);

		assertEquals("testName", copy.getName());
		assertEquals(defaultValue, copy.getDefaultValue());
		assertNotNull(copy.getSerializer());
		assertEquals(serializer, copy.getSerializer());
	}
}