jPOS Programmer’s Guide jPOS Software SRL Version 2.1.5, 2021-09-02 Table of Contents Copyright notice . 1 Preface . 2 1. The jPOS Project. 3 1.1. About jPOS.org . 3 1.2. jPOS License . 3 1.3. About ISO-8583. 3 1.4. Downloading jPOS . 4 1.5. Directory structure . 4 1.6. Using jPOS. 6 1.7. Building jPOS . 7 1.8. Running jPOS . 8 2. About ISO-8583 . 10 2.1. An ISO-8583 primer . 10 2.2. jPOS approach to ISO-8583. 18 2.3. IncomingListener. 37 3. Support classes . 39 3.1. jPOS' Logger . 39 3.2. NameRegistrar. 43 3.3. Configuration . 45 3.4. SystemMonitor . 48 3.5. Profiler . 50 3.6. DirPoll . 51 3.7. ThreadPool . 53 4. Packagers . 55 4.1. Implementing Custom Packagers. 55 4.2. GenericPackager . 56 5. Channels. 60 5.1. TCP/IP Socket-based channels . 60 5.2. SSL Channels. 61 5.3. LoopbackChannel . 63 5.4. ChannelPool . 65 5.5. Channel Filters . 65 6. jPOS Space . 68 6.1. Space interface . 69 6.2. Local Space interface. 70 6.3. Space Factory . 71 6.4. TSpace. 72 6.5. JDBMSpace . 72 6.6. JESpace . 73 6.7. SpaceInterceptor . 73 6.8. SpaceTap. 73 6.9. SpaceUtil . 74 7. Q2. 75 7.1. Running Q2 . 75 7.2. Embedding Q2. 81 7.3. Shutting down Q2 . 82 7.4. Writing your first Q2 Script . 83 7.5. QTest - a sample QBean . 84 7.6. QBeanSupport . 93 7.7. Dynamic classloading . 96 8. Q2 jPOS Services . 99 8.1. ChannelAdaptor . ..