Java tutorial
/** * 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.activemq.apollo; import junit.framework.Test; import org.apache.activemq.command.ActiveMQQueue; import javax.jms.*; import java.util.ArrayList; import java.util.Enumeration; import java.util.List; /** * */ public class JmsQueueBrowserTest extends JmsTestBase { private static final org.apache.commons.logging.Log LOG = org.apache.commons.logging.LogFactory .getLog(JmsQueueBrowserTest.class); public static Test suite() { return suite(JmsQueueBrowserTest.class); } public static void main(String[] args) { junit.textui.TestRunner.run(suite()); } /** * Tests the queue browser. Browses the messages then the consumer tries to receive them. The messages should still * be in the queue even when it was browsed. * * Re-enable once https://issues.apache.org/jira/browse/APLO-226 is fixed. * * @throws Exception */ public void testReceiveBrowseReceive() throws Exception { Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); ActiveMQQueue destination = new ActiveMQQueue("TEST"); MessageProducer producer = session.createProducer(destination); MessageConsumer consumer = session.createConsumer(destination); connection.start(); Message[] outbound = new Message[] { session.createTextMessage("First Message"), session.createTextMessage("Second Message"), session.createTextMessage("Third Message") }; // lets consume any outstanding messages from previous test runs while (consumer.receive(1000) != null) { } producer.send(outbound[0]); producer.send(outbound[1]); producer.send(outbound[2]); // Get the first. assertEquals(outbound[0], consumer.receive(1000)); consumer.close(); //Thread.sleep(200); QueueBrowser browser = session.createBrowser((Queue) destination); Enumeration enumeration = browser.getEnumeration(); // browse the second assertTrue("should have received the second message", enumeration.hasMoreElements()); assertEquals(outbound[1], (Message) enumeration.nextElement()); // browse the third. assertTrue("Should have received the third message", enumeration.hasMoreElements()); assertEquals(outbound[2], (Message) enumeration.nextElement()); // There should be no more. boolean tooMany = false; while (enumeration.hasMoreElements()) { LOG.info("Got extra message: " + ((TextMessage) enumeration.nextElement()).getText()); tooMany = true; } assertFalse(tooMany); browser.close(); // Re-open the consumer. consumer = session.createConsumer(destination); // Receive the second. assertEquals(outbound[1], consumer.receive(1000)); // Receive the third. assertEquals(outbound[2], consumer.receive(1000)); consumer.close(); } public void testBrowseReceive() throws Exception { Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); ActiveMQQueue destination = new ActiveMQQueue("TEST"); connection.start(); Message[] outbound = new Message[] { session.createTextMessage("First Message"), session.createTextMessage("Second Message"), session.createTextMessage("Third Message") }; MessageProducer producer = session.createProducer(destination); producer.send(outbound[0]); // create browser first QueueBrowser browser = session.createBrowser((Queue) destination); Enumeration enumeration = browser.getEnumeration(); // create consumer MessageConsumer consumer = session.createConsumer(destination); // browse the first message assertTrue("should have received the first message", enumeration.hasMoreElements()); assertEquals(outbound[0], (Message) enumeration.nextElement()); // Receive the first message. assertEquals(outbound[0], consumer.receive(1000)); consumer.close(); browser.close(); producer.close(); } // Re-enable once https://issues.apache.org/jira/browse/APLO-226 is fixed. public void testQueueBrowserWith2Consumers() throws Exception { final int numMessages = 1000; // connection.setAlwaysSyncSend(false); Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE); ActiveMQQueue destination = new ActiveMQQueue("TEST"); ActiveMQQueue destinationPrefetch10 = new ActiveMQQueue("TEST?jms.prefetchSize=10"); ActiveMQQueue destinationPrefetch1 = new ActiveMQQueue("TEST?jms.prefetchsize=1"); connection.start(); Connection connection2 = factory.createConnection(userName, password); connection2.start(); connections.add(connection2); Session session2 = connection2.createSession(false, Session.AUTO_ACKNOWLEDGE); MessageProducer producer = session.createProducer(destination); MessageConsumer consumer = session.createConsumer(destinationPrefetch10); for (int i = 0; i < numMessages; i++) { TextMessage message = session.createTextMessage("Message: " + i); producer.send(message); } QueueBrowser browser = session2.createBrowser(destinationPrefetch1); Enumeration<Message> browserView = browser.getEnumeration(); List<Message> messages = new ArrayList<Message>(); for (int i = 0; i < numMessages; i++) { Message m1 = consumer.receive(5000); assertNotNull("m1 is null for index: " + i, m1); messages.add(m1); } int i = 0; for (; i < numMessages && browserView.hasMoreElements(); i++) { Message m1 = messages.get(i); Message m2 = browserView.nextElement(); assertNotNull("m2 is null for index: " + i, m2); assertEquals(m1.getJMSMessageID(), m2.getJMSMessageID()); } // currently browse max page size is ignored for a queue browser consumer // only guarantee is a page size - but a snapshot of pagedinpending is // used so it is most likely more assertTrue("got at least our expected minimum in the browser: ", i > 200); assertFalse("nothing left in the browser", browserView.hasMoreElements()); assertNull("consumer finished", consumer.receiveNoWait()); } public void testBrowseClose() throws Exception { Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); ActiveMQQueue destination = new ActiveMQQueue("TEST"); connection.start(); TextMessage[] outbound = new TextMessage[] { session.createTextMessage("First Message"), session.createTextMessage("Second Message"), session.createTextMessage("Third Message") }; MessageProducer producer = session.createProducer(destination); producer.send(outbound[0]); producer.send(outbound[1]); producer.send(outbound[2]); // create browser first QueueBrowser browser = session.createBrowser((Queue) destination); Enumeration enumeration = browser.getEnumeration(); // browse some messages assertEquals(outbound[0], (Message) enumeration.nextElement()); assertEquals(outbound[1], (Message) enumeration.nextElement()); //assertEquals(outbound[2], (Message) enumeration.nextElement()); browser.close(); // create consumer MessageConsumer consumer = session.createConsumer(destination); // Receive the first message. TextMessage msg = (TextMessage) consumer.receive(1000); assertEquals("Expected " + outbound[0].getText() + " but received " + msg.getText(), outbound[0], msg); msg = (TextMessage) consumer.receive(1000); assertEquals("Expected " + outbound[1].getText() + " but received " + msg.getText(), outbound[1], msg); msg = (TextMessage) consumer.receive(1000); assertEquals("Expected " + outbound[2].getText() + " but received " + msg.getText(), outbound[2], msg); consumer.close(); producer.close(); } }