/**
* The MIT License
* Copyright (c) 2014-2016 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.reader.writer.lock;
import com.iluwatar.reader.writer.lock.utils.InMemoryAppender;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import static junit.framework.TestCase.assertTrue;
import static org.mockito.Mockito.spy;
/**
* @author hongshuwei@gmail.com
*/
public class ReaderTest {
private InMemoryAppender appender;
@Before
public void setUp() {
appender = new InMemoryAppender(Reader.class);
}
@After
public void tearDown() {
appender.stop();
}
private static final Logger LOGGER = LoggerFactory.getLogger(ReaderTest.class);
/**
* Verify that multiple readers can get the read lock concurrently
*/
@Test
public void testRead() throws Exception {
ExecutorService executeService = Executors.newFixedThreadPool(2);
ReaderWriterLock lock = new ReaderWriterLock();
Reader reader1 = spy(new Reader("Reader 1", lock.readLock()));
Reader reader2 = spy(new Reader("Reader 2", lock.readLock()));
executeService.submit(reader1);
Thread.sleep(150);
executeService.submit(reader2);
executeService.shutdown();
try {
executeService.awaitTermination(10, TimeUnit.SECONDS);
} catch (InterruptedException e) {
LOGGER.error("Error waiting for ExecutorService shutdown", e);
}
// Read operation will hold the read lock 250 milliseconds, so here we prove that multiple reads
// can be performed in the same time.
assertTrue(appender.logContains("Reader 1 begin"));
assertTrue(appender.logContains("Reader 2 begin"));
assertTrue(appender.logContains("Reader 1 finish"));
assertTrue(appender.logContains("Reader 2 finish"));
}
}