/*
 * 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.streaming.api.functions.source;

import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.common.io.FileInputFormat;
import org.apache.flink.api.java.typeutils.TypeExtractor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.core.fs.FileInputSplit;
import org.apache.flink.core.fs.Path;
import org.apache.flink.runtime.operators.testutils.ExpectedTestException;
import org.apache.flink.streaming.api.TimeCharacteristic;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
import org.apache.flink.streaming.runtime.tasks.mailbox.Mail;
import org.apache.flink.streaming.util.OneInputStreamOperatorTestHarness;

import org.junit.Test;

import static org.junit.Assert.fail;

/**
 * {@link ContinuousFileReaderOperator} test.
 */
public class ContinuousFileReaderOperatorTest {

	@Test(expected = ExpectedTestException.class)
	public void testExceptionRethrownFromClose() throws Exception {
		OneInputStreamOperatorTestHarness<TimestampedFileInputSplit, String> harness = createHarness(failingFormat());
		harness.getExecutionConfig().setAutoWatermarkInterval(10);
		harness.setTimeCharacteristic(TimeCharacteristic.IngestionTime);
		try (OneInputStreamOperatorTestHarness<TimestampedFileInputSplit, String> tester = harness) {
			tester.open();
		}
	}

	@Test(expected = ExpectedTestException.class)
	public void testExceptionRethrownFromProcessElement() throws Exception {
		OneInputStreamOperatorTestHarness<TimestampedFileInputSplit, String> harness = createHarness(failingFormat());
		harness.getExecutionConfig().setAutoWatermarkInterval(10);
		harness.setTimeCharacteristic(TimeCharacteristic.IngestionTime);
		try (OneInputStreamOperatorTestHarness<TimestampedFileInputSplit, String> tester = harness) {
			tester.open();
			tester.processElement(new StreamRecord<>(new TimestampedFileInputSplit(0L, 1, new Path(), 0L, 0L, new String[]{})));
			for (Mail m : harness.getTaskMailbox().drain()) {
				m.run();
			}
			fail("should throw from processElement");
		}
	}

	private FileInputFormat<String> failingFormat() {
		return new FileInputFormat<String>() {
			@Override
			public boolean reachedEnd() {
				return false;
			}

			@Override
			public String nextRecord(String reuse) {
				throw new ExpectedTestException();
			}

			@Override
			public void open(FileInputSplit fileSplit) {
				throw new ExpectedTestException();
			}

			@Override
			public void close() {
				throw new ExpectedTestException();
			}

			@Override
			public void configure(Configuration parameters) {
			}
		};
	}

	private <T> OneInputStreamOperatorTestHarness<TimestampedFileInputSplit, T> createHarness(FileInputFormat<T> format) throws Exception {
		ExecutionConfig config = new ExecutionConfig();
		return new OneInputStreamOperatorTestHarness<>(
				new ContinuousFileReaderOperatorFactory<>(format, TypeExtractor.getInputFormatTypes(format), config),
				TypeExtractor.getForClass(TimestampedFileInputSplit.class).createSerializer(config));
	}

}