App server4rpg - English

1. Introduction RPG Calls Java AppServer4RPG Benchmark Example Inside ArdGate fast, stable and scalable RPG to Java calls Dieter Bender Dieter Bender Inside ArdGate

2. Introduction Who is Dieter Bender RPG Calls Java Architecture of ArdGate AppServer4RPG The Gleiberg Project Benchmark Example Who is Dieter Bender WWW.BENDER-DV.DE Dieter Bender, 35435 Wettenberg, Germany AS/400 consultant Java, SQL, ILE RPG, COBOL Application integration, Database Training: Java, SQL, ILE RPG Open source components ArdGate: access any database from i with SQL AppServer4RPG: stable, scalable and fast RPG to Java integration some RPG components Dieter@Bender-DV.de Dieter Bender Inside ArdGate

3. Introduction Who is Dieter Bender RPG Calls Java Architecture of ArdGate AppServer4RPG The Gleiberg Project Benchmark Example Architecture *ARDPGM must be native JDBC must be Java very few RPG (blue) lots of Java (red) lots of calls from RPG to Java multiple users no controll of environment Dieter Bender Inside ArdGate

10. Introduction Who is Dieter Bender RPG Calls Java Architecture of ArdGate AppServer4RPG The Gleiberg Project Benchmark Example Why Gleiberg Project? AppServer4RPG I’m living nearby open source to protect copyright of a Freelancer result of > 10 years teaching and project experience Dieter Bender Inside ArdGate

14. Introduction Why is this Important? RPG Calls Java Ways to Call Java from RPG AppServer4RPG RPGs JNI Support Benchmark Example RPG is only a Subset of Java Java is designed for multithreading Java has lots of high quality open source components Java has lots of high quality open source tools RPG doesn’t have for money programmer productivity with OO languages is by far higher (by same level of experience) some examples: WebServices and XML generating PDF, HTML and EXCEL JDBC access to databases Dieter Bender Inside ArdGate

19. Introduction Why is this Important? RPG Calls Java Ways to Call Java from RPG AppServer4RPG RPGs JNI Support Benchmark Example RPG Calls Java RUNJVA and QSH CMD(java ...) only Java applications could be called only error level is coming back horrible Overhead Java stored procedures only static methods could be called in SQL client mode not scaling in SQL server mode no controll over JVM properties JNI Java native interface was designed for C implementation of JVM and implementation of the Java tools cryptic programming and bad maintainability of code error recovery and analysis is complicated Dieter Bender Inside ArdGate

22. Introduction Why is this Important? RPG Calls Java Ways to Call Java from RPG AppServer4RPG RPGs JNI Support Benchmark Example Why I Don’t Like Embedded Java in RPG controll of the Java environment is near to impossible, because the JVM is started automatically using normal Java components produces embedded Java in RPG these programms are hard to develop, debug and maintain ﬁrst call is very slow and starting hundreds or thousands JVM makes IBM happy, but doesn’t scale well the implementation of the JNI support in the RPG compiler is buggy and crashing JVMs are not recovereable! (BTW: never saw a crashing JVM outside the JNI support of RPG!!!) too much programming eﬀort for suboptimal results Dieter Bender Inside ArdGate

28. Introduction Architecture of AppServer4RPG RPG Calls Java The EventHandler Interface AppServer4RPG The PORDS2POJO Pattern Benchmark Example Architecture Overview one resident JVM serves multiple RPG clients asynchronous communication extendable EventHandler concept RPG sends and receives DataStructure (translated by Java) Dieter Bender Inside ArdGate

32. Introduction Architecture of AppServer4RPG RPG Calls Java The EventHandler Interface AppServer4RPG The PORDS2POJO Pattern Benchmark Example The RPG Perspective RPG calls Java method read as: outDS = ARDPGM(inDS) Dieter Bender Inside ArdGate

33. Introduction Architecture of AppServer4RPG RPG Calls Java The EventHandler Interface AppServer4RPG The PORDS2POJO Pattern Benchmark Example The RPG Perspective RPG calls Java method read as: outDS = ARDPGM(inDS) Dieter Bender Inside ArdGate

34. Introduction Architecture of AppServer4RPG RPG Calls Java The EventHandler Interface AppServer4RPG The PORDS2POJO Pattern Benchmark Example The Java Perspective Action: what should be called? how has the handler to look like? Dieter Bender Inside ArdGate

35. Introduction Architecture of AppServer4RPG RPG Calls Java The EventHandler Interface AppServer4RPG The PORDS2POJO Pattern Benchmark Example The Java Perspective Action: what should be called? how has the handler to look like? Dieter Bender Inside ArdGate

36. Introduction Architecture of AppServer4RPG RPG Calls Java The EventHandler Interface AppServer4RPG The PORDS2POJO Pattern Benchmark Example Hybrid Objects Plain Old RPG DataStructure Plain Old Java Object Dieter Bender Inside ArdGate

37. Introduction Architecture of AppServer4RPG RPG Calls Java The EventHandler Interface AppServer4RPG The PORDS2POJO Pattern Benchmark Example Hybrid Objects Plain Old RPG DataStructure Plain Old Java Object Dieter Bender Inside ArdGate

38. Introduction Architecture of AppServer4RPG RPG Calls Java The EventHandler Interface AppServer4RPG The PORDS2POJO Pattern Benchmark Example Translation Objects PORDS2POJO:= a Java object, encapsulating the translation between the binary representation of a PORDS and a POJO POJO with all components of the PORDS as Java types object variable to hold the PORDS ( private byte[] huddle ) setter and getter for the binary huddle this Hybrid objects always reﬂect the Java and the RPG perspective of the same data sometimes only on direction is needed and implemented Dieter Bender Inside ArdGate

43. Introduction Generating PDF from HTML RPG Calls Java The RUNJVA Way AppServer4RPG The Embedded Java in RPG Way Benchmark Example The Gleiberg Version A Real Life Example The idea: RPG application generates a HTML invoice Java generates from the HTML and a CSS a PDF invoice the Java Part is done by iText and Flying Saucer Requirement: 10.000 invoices in 6 h ﬁrst customer evaluation: 30 sec. up to minutes for 1! my ﬁrst evaluation on Wintel: subsecond! Dieter Bender Inside ArdGate

48. Introduction Generating PDF from HTML RPG Calls Java The RUNJVA Way AppServer4RPG The Embedded Java in RPG Way Benchmark Example The Gleiberg Version HTML2PDF4I by Aaron Bartell Article in IBM Systems Magazine Open Source at http://mowyourlawn.com Java Application as a wrapper for iText and Flying Saucer called by RPG programm via RUNJVA with assembled classpath setting my evaluation 10 sec. opening a Job for each call of RUNJVA and starting a JVM slow, but scaling linear - JVM is closed after call. Dieter Bender Inside ArdGate

51. Introduction Generating PDF from HTML RPG Calls Java The RUNJVA Way AppServer4RPG The Embedded Java in RPG Way Benchmark Example The Gleiberg Version The Classpath Problem first problem: you will need 3 jar files in your classpath starting the JVM at Job begin => a JVM is started, but maybe not used starting the JVM before usage => might fail, because started before submitting a job for usage => same problem as RUNJVA with more effort! setting global classpath => might interfere with other applications using extdir => even worse, has higher priority than classpath setting Dieter Bender Inside ArdGate

56. Introduction Generating PDF from HTML RPG Calls Java The RUNJVA Way AppServer4RPG The Embedded Java in RPG Way Benchmark Example The Gleiberg Version Why I Gave Up second problem: for one java statement you need multiple RPG declarations and statements. 10 minutes programming java <=> one day programming embedded Java in RPG third problem: hard to read debug and even worse in production! impossible to use log4j maybe faster for subsequent calls in the same job than RUNJVA scalability even worse (the programm could be called in every Job!) Dieter Bender Inside ArdGate

59. Introduction Generating PDF from HTML RPG Calls Java The RUNJVA Way AppServer4RPG The Embedded Java in RPG Way Benchmark Example The Gleiberg Version The RPG Perspective what we want install AppServer4RPG implement the call Dieter Bender Inside ArdGate

62. Introduction Generating PDF from HTML RPG Calls Java The RUNJVA Way AppServer4RPG The Embedded Java in RPG Way Benchmark Example The Gleiberg Version Closing the Chain to Java now we need an EventHandler to be called conﬁgure AppServer4RPG Dieter Bender Inside ArdGate

63. Introduction Generating PDF from HTML RPG Calls Java The RUNJVA Way AppServer4RPG The Embedded Java in RPG Way Benchmark Example The Gleiberg Version Closing the Chain to Java now we need an EventHandler to be called conﬁgure AppServer4RPG Dieter Bender Inside ArdGate

64. Introduction Generating PDF from HTML RPG Calls Java The RUNJVA Way AppServer4RPG The Embedded Java in RPG Way Benchmark Example The Gleiberg Version What Happens Now Calling the RPG Programm? the RPG part puts its input parameters to the request DS and calls fireEventP the RPG part of JVAGATE creates a response DTAQ sends the data (and an identifier for the caller Job) in packages to the JAVAQ listens on the responseQ for the answer Now the Java part of AppServer4RPG does its work (hopefully it was started) starts a new worker Thread to be ready for the next request creates a Handler for the requested Event, creates Request and Response Objects and calls the performWork of the Handler sends the response Data back in packages to the ResponseQ. known by the identifier passed with the request Dieter Bender Inside ArdGate

67. Introduction Generating PDF from HTML RPG Calls Java The RUNJVA Way AppServer4RPG The Embedded Java in RPG Way Benchmark Example The Gleiberg Version The EventHandler gets a Request a simple PORDS2POJO binary is set with Constructor getter for properties the EventHandler Dieter Bender Inside ArdGate

70. Introduction Generating PDF from HTML RPG Calls Java The RUNJVA Way AppServer4RPG The Embedded Java in RPG Way Benchmark Example The Gleiberg Version The Results Transaction Times of subseconds first call in a Job as fast as following (JVM is prestarted) very scalable (one JVM serves multiple RPG Jobs) no Classpath issues, simply throw the needed jar files to the lib directory of AppServer4RPG multiple instances of AppServer4RPG could run on the same box with diffrent JVM settings AppServer4RPG could be installed on a dedicated server less programming effort than embedded Java in RPG flexible logging with log4j simplifies trouble shooting Dieter Bender Inside ArdGate

76. Introduction Generating PDF from HTML RPG Calls Java The RUNJVA Way AppServer4RPG The Embedded Java in RPG Way Benchmark Example The Gleiberg Version Summary Don’t try to write Java code in RPG, provide Java methods with Datastructure parameter interfaces for RPG usage! Let your Java Code run in a prestarted resident JVM, communicating asynchronous with your native programms. Outlook (Nice to have!) Dynamic PORDS2POJO Beans. True Tomcat Version of AppServer4RPG. Dieter Bender Inside ArdGate

77. Introduction Generating PDF from HTML RPG Calls Java The RUNJVA Way AppServer4RPG The Embedded Java in RPG Way Benchmark Example The Gleiberg Version Questions? Dieter Bender Inside ArdGate

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