/*
 * 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.test.runtime;

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.test.util.MultipleProgramsTestBase;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

@RunWith(Parameterized.class)
public class RegisterTypeWithKryoSerializerITCase extends MultipleProgramsTestBase {

	public RegisterTypeWithKryoSerializerITCase(TestExecutionMode mode) {
		super(mode);
	}

	/**
	 * Tests whether the kryo serializer is forwarded via the ExecutionConfig.
	 * @throws Exception
	 */
	@Test
	public void testRegisterTypeWithKryoSerializer() throws Exception {
		int numElements = 10;
		ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

		env.registerTypeWithKryoSerializer(TestClass.class, new TestClassSerializer());

		DataSet<Long> input = env.generateSequence(0, numElements - 1);

		DataSet<TestClass> mapped = input.map(new MapFunction<Long, TestClass>() {
			private static final long serialVersionUID = -529116076312998262L;

			@Override
			public TestClass map(Long value) throws Exception {
				return new TestClass(value);
			}
		});

		List<TestClass> expected = new ArrayList<>(numElements);

		for (int i = 0; i < numElements; i++) {
			expected.add(new TestClass(42));
		}

		compareResultCollections(expected, mapped.collect(), new Comparator<TestClass>() {
			@Override
			public int compare(TestClass o1, TestClass o2) {
				return (int)(o1.getValue() - o2.getValue());
			}
		});
	}

	static class TestClass {
		private final long value;
		private Object obj = new Object();

		public TestClass(long value) {
			this.value = value;
		}

		public long getValue() {
			return value;
		}

		@Override
		public String toString() {
			return "TestClass(" + value + ")";
		}

		@Override
		public boolean equals(Object obj) {
			if (obj instanceof TestClass) {
				TestClass other = (TestClass) obj;

				return value == other.value;
			} else {
				return false;
			}
		}

		@Override
		public int hashCode() {
			return (int)value;
		}
	}

	static class TestClassSerializer extends Serializer<TestClass> implements Serializable {

		private static final long serialVersionUID = -3585880741695717533L;

		@Override
		public void write(Kryo kryo, Output output, TestClass testClass) {
			output.writeLong(42);
		}

		@Override
		public TestClass read(Kryo kryo, Input input, Class<TestClass> aClass) {
			return new TestClass(input.readLong());
		}
	}
}