/*
 * 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.contrib.streaming;

import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.base.LongSerializer;
import org.apache.flink.core.memory.DataOutputViewStreamWrapper;

import org.junit.Test;

import java.net.Socket;
import java.util.Random;
import java.util.concurrent.atomic.AtomicReference;

import static org.junit.Assert.*;

public class SocketStreamIteratorTest {
	
	@Test
	public void testIterator() throws Exception {
		
		final AtomicReference<Throwable> error = new AtomicReference<>();
		
		final long seed = new Random().nextLong();
		final int numElements = 1000;
		
		final SocketStreamIterator<Long> iterator = new SocketStreamIterator<>(LongSerializer.INSTANCE);
		
		Thread writer = new Thread() {
			
			@Override
			public void run() {
				try {
					try (Socket sock = new Socket(iterator.getBindAddress(), iterator.getPort());
						DataOutputViewStreamWrapper out = new DataOutputViewStreamWrapper(sock.getOutputStream()))
					{
						final TypeSerializer<Long> serializer = LongSerializer.INSTANCE;
						final Random rnd = new Random(seed);
						
						for (int i = 0; i < numElements; i++) {
							serializer.serialize(rnd.nextLong(), out);
						}
					}
				}
				catch (Throwable t) {
					error.set(t);
				}
			}
		};
		
		writer.start();
		
		final Random validator = new Random(seed);
		for (int i = 0; i < numElements; i++) {
			assertTrue(iterator.hasNext());
			assertTrue(iterator.hasNext());
			assertEquals(validator.nextLong(), iterator.next().longValue());
		}
		
		assertFalse(iterator.hasNext());
		writer.join();
		assertFalse(iterator.hasNext());
	}

	@Test
	public void testIteratorWithException() throws Exception {

		final SocketStreamIterator<Long> iterator = new SocketStreamIterator<>(LongSerializer.INSTANCE);

		// asynchronously set an error
		new Thread() {
			@Override
			public void run() {
				try {
					Thread.sleep(100);
				} catch (InterruptedException ignored) {}
				iterator.notifyOfError(new Exception("test"));
			}
		}.start();

		try {
			iterator.hasNext();
		}
		catch (Exception e) {
			assertTrue(e.getCause().getMessage().contains("test"));
		}
	}
}