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_serverURL = gcparamAsString("serverURL"); _queueName = gcparamAsString("queue"); _outlets = gcparamAsInt("outlets"); _persistentDelivery = gcparamAsBoolean("persistentDelivery"); _details = gcparamAsInt("details"); try { _ctx = getlnitialContext(_serverURL); _queueConnectionFactory = (QueueConnectionFactory) _ctxlookup(JMS_FACTORY) ; _queueConnection = _queueConnectionFactorycreateQueueConnection(); _queueSession = _queueConnectioncreateQueueSession(false, SessionAUTO_ACKNOWLEDGE); try { _queue = (Queue) _ctxlookup(_queueName); } catch(NamingException ne){ _queue = _queueSessioncreateQueue(_queueName); _ctxbind(_queueName, _queue); } _sender = _queueSessioncreateSender(_queue); if (_persistentDelivery) _sendersetDeliveryMode(DeliveryModePERSISTENT); else _sendersetDeliveryMode(DeliveryModeNON_PERSISTENT); _queueConnectionstart(); Systemoutprintlnl"PTPSndBmk: JMS connection opened"); _outletNumber = 1; } catch(Exception e) { Systemerrprintln("PTPSndBmk: an exception has occurred " + "when trying to open a JMS connection:"); Systemerrprintln("PTPSndBmk: " + e); } } public void send() { //SystemoutprintIn("calling send"); ObjectMessage msg = null; Hashtable ht = null; try { msg = _queueSessioncreateObjectMessage(); ht = prepareOrder(_outletNumber); msgsetLongProperty("outletNumber", ((Long)htget("outletNumber"))longValue()); msgsetObject(ht); _sendersend(msg); //Systemoutprintln("PTPSndBmk: JMS message (id=" + _messagesSent + ") sent to outlet: " + _outletNumber); _messagesSent++ ,_outletNumber = 1 + (_messagesSent % _outlets); } catch(Exception e) { Systemerrprintln("PTPSndBmk: an exception has occurred " + "when trying to send a JMS message:"); Systemerrprintln("PTPSndBmk: " + e) ; } }
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Next is a fragment of the plugin PTPRcvBmk that receives JMS Point to Point messages: /**
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* This class is a Grinder plug-in for receiving Point-to-Point JMS * messages * This plug-in is specific for testing application from * chapter 7 of the book */ public class PTPRcvBmk implements comejbgrindergrinderGrinderPlugin { public void init(GrinderContext gc) { Systemoutprintln("calling init"); _serverURL = gcparamAsString("serverURL"); _queueName = gcparamAsString("queue"); _outletNumber = gcparamAsInt("outletNumber"); try { _ctx = getlnitialContext(_serverURL); _queueConnectionFactory = (QueueConnectionFactory)
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_ctxlookup(JMS_FACTORY);
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_queueConnection = _queueConnectionFactorycreateQueueConnection(); _queueSession = _queueConnectioncreateQueueSessionlfalse,
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SessionAUTO_ACKNOWLEDGE); try {
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_queue = (Queue) _ctxlookup(_queueName); } catch(NamingException ne) { _queue = _queueSessioncreateQueue(_queueName); _ctxbind(_queueName, _queue); } String selector = "outletNumber = " + _outletNumber; _receiver = _queueSessioncreateReceiver(_queue, selector); _queueConnectionstart(); Systemoutprintln("PTPRcvBmk: JMS connection opened"); } catch(Exception e) { Systemerrprintlnf"PTPRcvBmk: an exception has occurred when " + "trying to open a JMS connection:"); Systemerrprintln("PTPRcvBmk: " + e); } } public void receive() { //Systemoutprintln("calling receive"); Message msg = null; Hashtable ht = null; try { msg = _receiverreceive(); _messagesReceived++; //Systemoutprintlnt"PTPRcvBmk: JMS message received"); //Systemoutprintln("outletNumber=" + // msggetLongProperty("outletNumber")); if (msg instanceof ObjectMessage) { ht = (Hashtable)((ObjectMessage)msg)getObjectO; Customer c = (Customer)htget("customer"); OrderMaster or = (OrderMaster)htget("orderMaster");
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Grinding the Pizzas
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Vector vOd = (Vector)htget("orderDetail"); saveOrder(c, or, vOd) ; } else {}} catch(Exception e) { Systemerrprintlnf"PTPRcvBmk: an exception has occurred when "trying to receive a JMS message:"); Systemerrprintln("PTPRcvBmk: " + e); } }
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Once these classes have been completed, the next step is to prepare the grinder properties file to execute them Let us start with the producer First the test class is defined: grindercycleClass=j swellPTPSndBmk Then the methods of the test class are defined: grindercycleMethods=init,send,end And finally, the parameters that are to be passed to the class for execution:
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grindereyeleParams=[serverURL]t3://grace:7001,\ [queue]j sworderQueue,\ [outlets]3,\ [persistentDelivery]true,\ [details]2
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In this case we are specifying the server and queue to be used, as well as that it has to produce messages for three outlets, which are persistent and contain 2 items (pizzas) Finally, the number of cycles is set to 12,000: grindertimes=12000 For the consumer, the test script is similar The test class, its methods, and parameters are specified:
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grindercycleClass=jswcllPTPRcvBmk grindercycleMethods=init,receive,end grindercycleParams=[serverURL]t3://grace:7001,\ [queue]j sworderQueue,\ [outletNumber]1
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The parameters are the server and queue it should listen to In this example the Grinder will be simulating outlet number 1 Finally the number of cycles is set to 4,000
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The Test Environment
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For this set of test runs, the computer architecture used is presented in the following diagram All the machines are connected via a 100Mb network, although the ideal scenario would be to have the consumer machines connected to the network via a slow connection, like a 64K line This would be closer to the reality of Pizza2Go
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The troops decide that the tests will consist of only one producer (the application when sending the order) and three consumers (outlets) Admittedly, the system could be tested with more than one producer (the various instances of the bean producing the message) or with more outlets listening to the queue But since the messages are defined as persistent, it was felt that these additions would have more of an impact on the database than on theJMS system They designed four tests: Q The producer runs alone, sending the messages to the persistent queue The objective is to simulate that the outlets are not connected
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a The consumers run alone getting their messages from the queue This is to measure the effort a consumer must go through to retrieve a large number of messages after a lengthy period of disconnection Q The producer and the consumers run simultaneously, as would be the case in reality
j The producer and consumers run simultaneously and the messages are not persistent This is just to understand the price of persistence The tests are based on having the producer blast 4,000 messages to the 3 outlets for a total of 12,000 messages Each of the outlets will then consume the 4,000 messages The size of the message (the pizza order) is about 2K