/*
* Copyright 2012 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 com.nokia.dempsy.messagetransport.blockingqueue;
import static org.junit.Assert.assertEquals;
import java.util.concurrent.BlockingQueue;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.nokia.dempsy.messagetransport.Destination;
import com.nokia.dempsy.messagetransport.OverflowHandler;
import com.nokia.dempsy.messagetransport.Sender;
import com.nokia.dempsy.messagetransport.SenderFactory;
public class BlockingQueueTest
{
private ClassPathXmlApplicationContext ctx;
private Sender sender;
private SenderFactory senderFactory;
private BlockingQueueAdaptor destinationFactory;
private MyPojo pojo;
private MyOverflowHandler overflowHandler;
public static class MyPojo
{
public BlockingQueue<byte[]> receiver;
public void setQueue(BlockingQueue<byte[]> receiver)
{
this.receiver = receiver;
}
public byte[] getMessage() throws Exception
{
return receiver.take();
}
}
public static class MyOverflowHandler implements OverflowHandler
{
public int overflowCalled = 0;
@Override
public synchronized void overflow(byte[] messageBytes)
{
overflowCalled++;
notifyAll();
}
}
public void setUp(String applicationContextFilename) throws Exception
{
ctx = new ClassPathXmlApplicationContext(applicationContextFilename, getClass());
ctx.registerShutdownHook();
Sender lsender = (Sender)ctx.getBean("sender");
sender = lsender;
pojo = (MyPojo)ctx.getBean("testPojo");
overflowHandler = (MyOverflowHandler)ctx.getBean("testOverflowHandler");
}
public void setUp2(String applicationContextFilename) throws Exception
{
ctx = new ClassPathXmlApplicationContext(applicationContextFilename, getClass());
ctx.registerShutdownHook();
SenderFactory lsender = (SenderFactory)ctx.getBean("senderFactory");
senderFactory = lsender;
destinationFactory = (BlockingQueueAdaptor)ctx.getBean("adaptor");
pojo = (MyPojo)ctx.getBean("testPojo");
overflowHandler = (MyOverflowHandler)ctx.getBean("testOverflowHandler");
}
/**
* @throws java.lang.Exception
*/
public void tearDown() throws Exception
{
if (ctx != null)
{
ctx.close();
ctx.destroy();
ctx = null;
}
pojo = null;
overflowHandler = null;
sender = null;
senderFactory = null;
destinationFactory = null;
}
/*
* Test basic functionality for the BlockingQueue implementation
* of Message Transport. Verify that messages sent to the Sender
* arrive at the receiver via handleMessage.
*/
@Test
public void testBlockingQueue() throws Throwable
{
try
{
setUp("/blockingqueueTestAppContext.xml");
sender.send("Hello".getBytes());
String message = new String( pojo.getMessage() );
assertEquals("Hello", message);
assertEquals(0, overflowHandler.overflowCalled);
}
finally
{
if (ctx != null)
tearDown();
}
}
/**
* Test a non-blocking Transport without an overflow handler
* on the transport. Should call overflow handler once
* queue is full.
* @throws Throwable
*/
@Test
public void testNonBlockingQueueOverflow() throws Throwable
{
try
{
setUp("/overflowTestAppContext.xml");
synchronized(overflowHandler) /// avoid a race condition
{
sender.send("Hello".getBytes());
overflowHandler.wait(500);
}
assertEquals(0,overflowHandler.overflowCalled);
synchronized(overflowHandler) /// avoid a race condition
{
sender.send("Hello again".getBytes());
overflowHandler.wait(500);
}
assertEquals(0,overflowHandler.overflowCalled);
synchronized(overflowHandler) /// avoid a race condition
{
sender.send("Hello I must be going.".getBytes());
overflowHandler.wait(500);
}
assertEquals(0,overflowHandler.overflowCalled);
synchronized(overflowHandler) /// avoid a race condition
{
sender.send("Hello I must be going again.".getBytes());
overflowHandler.wait(500);
}
assertEquals(1,overflowHandler.overflowCalled);
sender.send("Hello again I must be going again.".getBytes());
}
finally
{
tearDown();
}
}
/**
* Test overflow for a blocking Transport around a queue with depth one.
* While the transport will not call the, and does not even have a , overflow handler,
* every message will call the overflow handler on the receiver since the queue is
* always full.
*
* @throws Throwable
*/
@Test
public void testBlockingQueueOverflow() throws Throwable
{
try
{
setUp("/overflowTest2AppContext.xml");
synchronized(overflowHandler) /// avoid a race condition
{
sender.send("Hello".getBytes());
overflowHandler.wait(500);
}
assertEquals(0,overflowHandler.overflowCalled);
synchronized(overflowHandler) /// avoid a race condition
{
sender.send("Hello again".getBytes());
overflowHandler.wait(500);
}
assertEquals(1,overflowHandler.overflowCalled);
synchronized(overflowHandler) /// avoid a race condition
{
sender.send("Hello I must be going.".getBytes());
overflowHandler.wait(500);
}
assertEquals(2,overflowHandler.overflowCalled);
}
finally
{
tearDown();
}
}
@Test
public void testBlockingQueueUsingDestination() throws Exception
{
try
{
setUp2("/blockingqueueTest2AppContext.xml");
Destination destination = destinationFactory.getDestination();
Sender lsender = senderFactory.getSender(destination);
lsender.send("Hello".getBytes());
String message = new String( pojo.getMessage() );
assertEquals("Hello", message);
assertEquals(0, overflowHandler.overflowCalled);
}
finally
{
if (ctx != null)
tearDown();
}
}
}