/*
* Copyright 2016-2017 the original author or authors.
*
* Licensed 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.springframework.cassandra.core;
import static edu.umd.cs.mtc.TestFramework.*;
import static org.assertj.core.api.Assertions.*;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.Mockito.*;
import edu.umd.cs.mtc.MultithreadedTestCase;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnitRunner;
import com.datastax.driver.core.PreparedStatement;
import com.datastax.driver.core.Session;
/**
* Unit tests for {@link CachedPreparedStatementCreator}.
*
* @author Mark Paluch
*/
@RunWith(MockitoJUnitRunner.class)
public class CachedPreparedStatementCreatorUnitTests {
PreparedStatement preparedStatement;
@Mock Session sessionMock;
@Before
public void before() throws Exception {
preparedStatement = newProxy(PreparedStatement.class, new TestInvocationHandler());
when(sessionMock.prepare(anyString())).thenReturn(preparedStatement);
}
@Test(expected = IllegalArgumentException.class) // DATACASS-253
public void shouldRejectEmptyCql() {
new CachedPreparedStatementCreator("");
}
@Test(expected = IllegalArgumentException.class) // DATACASS-253
public void shouldRejectNullCql() {
new CachedPreparedStatementCreator(null);
}
@Test // DATACASS-253
public void shouldCreatePreparedStatement() {
CachedPreparedStatementCreator cachedPreparedStatementCreator = new CachedPreparedStatementCreator("my cql");
PreparedStatement result = cachedPreparedStatementCreator.createPreparedStatement(sessionMock);
assertThat(result).isSameAs(preparedStatement);
verify(sessionMock).prepare("my cql");
}
@Test // DATACASS-253
public void shouldCacheCreatePreparedStatement() {
CachedPreparedStatementCreator cachedPreparedStatementCreator = new CachedPreparedStatementCreator("my cql");
cachedPreparedStatementCreator.createPreparedStatement(sessionMock);
cachedPreparedStatementCreator.createPreparedStatement(sessionMock);
PreparedStatement result = cachedPreparedStatementCreator.createPreparedStatement(sessionMock);
assertThat(result).isSameAs(preparedStatement);
verify(sessionMock, times(1)).prepare("my cql");
}
@Test // DATACASS-253
public void concurrentAccessToCreateStatementShouldBeSynchronized() throws Throwable {
CreatePreparedStatementIsThreadSafe concurrentPrepareStatement = new CreatePreparedStatementIsThreadSafe(
preparedStatement, new CachedPreparedStatementCreator("my cql"));
runManyTimes(concurrentPrepareStatement, 5);
}
@SuppressWarnings("unused")
private static class CreatePreparedStatementIsThreadSafe extends MultithreadedTestCase {
final AtomicInteger atomicInteger = new AtomicInteger();
final CachedPreparedStatementCreator preparedStatementCreator;
final Session session;
public CreatePreparedStatementIsThreadSafe(final PreparedStatement preparedStatement,
CachedPreparedStatementCreator preparedStatementCreator) {
this.preparedStatementCreator = preparedStatementCreator;
this.session = newProxy(Session.class, new TestInvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getName().equals("prepare") && args.length == 1) {
waitForTick(2);
atomicInteger.incrementAndGet();
return preparedStatement;
}
return super.invoke(proxy, method, args);
}
});
}
public void thread1() {
waitForTick(1);
preparedStatementCreator.createPreparedStatement(session);
assertThat(atomicInteger.get()).isEqualTo(1);
}
public void thread2() {
waitForTick(1);
preparedStatementCreator.createPreparedStatement(session);
assertThat(atomicInteger.get()).isEqualTo(1);
}
}
private static class TestInvocationHandler implements InvocationHandler {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getName().equals("hashCode")) {
return hashCode();
}
if (method.getName().equals("equals") && args.length == 1) {
return equals(args[0]);
}
return null;
}
}
@SuppressWarnings("unchecked")
private static <T> T newProxy(Class<T> theClass, InvocationHandler invocationHandler) {
return (T) Proxy.newProxyInstance(CachedPreparedStatementCreatorUnitTests.class.getClassLoader(),
new Class[] { theClass }, invocationHandler);
}
}