/*
 * 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;

import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.java.typeutils.GenericTypeInfo;
import org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer;
import org.apache.flink.core.testutils.CommonTestUtils;
import org.apache.flink.util.SerializedValue;

import org.junit.Test;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Random;

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

public class ExecutionConfigTest {

	@Test
	public void testDoubleTypeRegistration() {
		ExecutionConfig config = new ExecutionConfig();
		List<Class<?>> types = Arrays.<Class<?>>asList(Double.class, Integer.class, Double.class);
		List<Class<?>> expectedTypes = Arrays.<Class<?>>asList(Double.class, Integer.class);

		for (Class<?> tpe: types) {
			config.registerKryoType(tpe);
		}

		int counter = 0;

		for (Class<?> tpe: config.getRegisteredKryoTypes()){
			assertEquals(tpe, expectedTypes.get(counter++));
		}

		assertEquals(expectedTypes.size(), counter);
	}

	@Test
	public void testConfigurationOfParallelism() {
		ExecutionConfig config = new ExecutionConfig();

		// verify explicit change in parallelism
		int parallelism = 36;
		config.setParallelism(parallelism);

		assertEquals(parallelism, config.getParallelism());

		// verify that parallelism is reset to default flag value
		parallelism = ExecutionConfig.PARALLELISM_DEFAULT;
		config.setParallelism(parallelism);

		assertEquals(parallelism, config.getParallelism());
	}

	@Test
	public void testDisableGenericTypes() {
		ExecutionConfig conf = new ExecutionConfig();
		TypeInformation<Object> typeInfo = new GenericTypeInfo<Object>(Object.class);

		// by default, generic types are supported
		TypeSerializer<Object> serializer = typeInfo.createSerializer(conf);
		assertTrue(serializer instanceof KryoSerializer);

		// expect an exception when generic types are disabled
		conf.disableGenericTypes();
		try {
			typeInfo.createSerializer(conf);
			fail("should have failed with an exception");
		}
		catch (UnsupportedOperationException e) {
			// expected
		}
	}

	@Test
	public void testExecutionConfigSerialization() throws IOException, ClassNotFoundException {
		final Random r = new Random();

		final int parallelism = 1 + r.nextInt(10);
		final boolean closureCleanerEnabled = r.nextBoolean(), 
				forceAvroEnabled = r.nextBoolean(),
				forceKryoEnabled = r.nextBoolean(),
				disableGenericTypes = r.nextBoolean(),
				objectReuseEnabled = r.nextBoolean(),
				sysoutLoggingEnabled = r.nextBoolean();

		final ExecutionConfig config = new ExecutionConfig();

		if (closureCleanerEnabled) {
			config.enableClosureCleaner();
		} else {
			config.disableClosureCleaner();
		}
		if (forceAvroEnabled) {
			config.enableForceAvro();
		} else {
			config.disableForceAvro();
		}
		if (forceKryoEnabled) {
			config.enableForceKryo();
		} else {
			config.disableForceKryo();
		}
		if (disableGenericTypes) {
			config.disableGenericTypes();
		} else {
			config.enableGenericTypes();
		}
		if (objectReuseEnabled) {
			config.enableObjectReuse();
		} else {
			config.disableObjectReuse();
		}
		if (sysoutLoggingEnabled) {
			config.enableSysoutLogging();
		} else {
			config.disableSysoutLogging();
		}
		config.setParallelism(parallelism);

		final ExecutionConfig copy1 = CommonTestUtils.createCopySerializable(config);
		final ExecutionConfig copy2 = new SerializedValue<>(config).deserializeValue(getClass().getClassLoader());

		assertNotNull(copy1);
		assertNotNull(copy2);

		assertEquals(config, copy1);
		assertEquals(config, copy2);

		assertEquals(closureCleanerEnabled, copy1.isClosureCleanerEnabled());
		assertEquals(forceAvroEnabled, copy1.isForceAvroEnabled());
		assertEquals(forceKryoEnabled, copy1.isForceKryoEnabled());
		assertEquals(disableGenericTypes, copy1.hasGenericTypesDisabled());
		assertEquals(objectReuseEnabled, copy1.isObjectReuseEnabled());
		assertEquals(sysoutLoggingEnabled, copy1.isSysoutLoggingEnabled());
		assertEquals(parallelism, copy1.getParallelism());
	}
}