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The following code was added to the OrderMaintenanceS servlet:
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int attempts = 0; while (attempts < MAXATTEMPTS) { try { currentOrderstoreOrder(); if (attempts > 0) { attempts++; Systemerrprintln("OrderMaintenanceServlet: " + "order stored in attempt #" + attempts); } break;
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catch(Exception de) { attempts++; Systemerrprintln("OrderMaintenanceServlet: " + "failed attempt to OrderSFstoreOrder() #" + attempts); if (attempts > MAXATTEMPTS) { sessionputValue("message", "Order not stored due to: " +de); Sy stemer rp rin tln(d e) ; return; } } } }
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The test was started again To the surprise of the Troops things were still not working When a transaction was rolled back and another attempt was tried, it still did not work Other tests were conducted with all sorts of debug output They finally figured it out What was happening was that the OrderBeanSF bean uses a local variable, isNew, to find out if it is a new order or an existing order When the transaction is rolled back, the value of this variable goes into limbo As the troops discussed what could be done, one of them found information on the SessionSynchronization interface This interface allows the recovery of conversational state It has three methods available: Q Q Q af terBegin (), called right after the start of a new transaction If you want to store attributes that you may need reverted, do it here bef oreCompletion (), called immediately before the completion of a transaction It is not known if it is committed or rolled back at this point af terCompletion (boolean committed), called after the completion of a transaction The transaction was successful if committed is true, otherwise its value is false It is in this method that you would recover the state
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The additions to the OrderBeanSF code are the following: /**
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* Used to revert the EJB Conversational State in the case * of a rolled back transaction */ public boolean previouslyNew;
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* Used to revert the EJB Conversational State in the case * of a rolled back transaction * It is part of the javaxejbSessionSynchronization interface */ public void afterBeginO { previouslyNew = isNew; } /** * Used to revert the EJB Conversational State in the case * of a rolled back transaction * It is part of the javaxejbSessionSynchronization interface */ public void beforeCompletion() { } /** * Used to revert the EJB Conversational State in the case * of a rolled back transaction * It is part of the javaxejbSessionSynchronization interface */ public void afterCompletion (boolean commited) { if (! commited) { isNew = previouslyNew;
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} } Now things seemed to be under control again, the troops are ready to run the test one more time The message, which was placed in the command console, was presented at the time of the transaction being committed:
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OrderMaintenanceServlet: order delivered in attempt
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#2 The results for this test are the following:
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Test 1151 url0 urll url2 url3 url4 url5 url6 url7 url8 url9 Total
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ART 8767 918 6808 9722 5801 7106 8387 7802 50834 2337 108482
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TPS 1141 10889 1469 1029 1724 1407 1192 1282 197 4279 092
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The response time is about 50% higher than the previous lest with 60 users This could be blamed on the overhead of the entity beans Shown below is the graph with the CPU usage of Grace:
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The CPU usage on Maria is pretty much the same as it was on the previous set of runs Below is a screenshot of the WebLogic console The interesting information for this run is that there were no passivations for either bean The OrderMasterEB bean has 180 instances in the cache, which is correct as there are 60 users creating 3 orders each The OrderDetailEB bean has 541 instances in the cache, which is also correct Each order has 3 items, multiplied by 180 it gives 540 details Since there was one item that was committed on the second try, it gives a total of 541
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