Architecting Design Decisions

by Viraj Khatavkar

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'PMMPX143 @virajkhatavkar

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"SDIJUFDUJOH%FTJHO %FDJTJPOT

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@virajkhatavkar

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@virajkhatavkar

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5IFIFBSUPGTPGUXBSFJTJUT BCJMJUZUPTPMWFEPNBJO SFMBUFEQSPCMFNTGPSJUTVTFS @virajkhatavkar

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$PNQMFYJUZJOUIFIFBSUPG TPGUXBSFIBTUPCFUBDLMFE IFBEPO5PEPPUIFSXJTFJT UPSJTLJSSFMFWBODF @virajkhatavkar

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'6/$5*0/"- 3&26*3&.&/54 @virajkhatavkar

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64&$"4&4 @virajkhatavkar

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DMBTT 4VCTDSJQUJPO$POUSPMMFS \ QVCMJD GVODUJPO TUPSF \ 4JHO6QUIFVTFS#VU XIBUFMTFEPUIFZXBOU 3FHVMBS4VCTDSJCFS +PJOJOHB5FBN 3FHJTUFSGPS'PSVN ^ ^ @virajkhatavkar

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DMBTT 4VCTDSJQUJPO$POUSPMMFS \ QVCMJD GVODUJPO TUPSF 3FRVFTUSFRVFTU \ 4JHO6QUIFVTFS#VU XIBUFMTFEPUIFZXBOU VTFS OFX 6TFS VTFSOBNFSFRVFTUOBNF VTFSSPMFSFRVFTUSPMF 3FHVMBS4VCTDSJCFS VTFSTBWF VTFS +PJOJOHBHJTUFS GPS'PSVN ^ ^ @virajkhatavkar

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DMBTT 4VCTDSJQUJPO$POUSPMMFS \ QVCMJD GVODUJPO TUPSF \ 4JHO6QUIFVTFS#VU IPX 3FHVMBS4VCTDSJCFS +PJOJOHB5FBN 3FHJTUFSGPS'PSVN ^ ^ @virajkhatavkar

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DMBTT 4VCTDSJQUJPO$POUSPMMFS \ QVCMJD GVODUJPO TUPSF \ 4JHO6QUIFVTFS#VU IPX 3FHVMBS4VCTDSJCFS +PJOJOHB5FBN 3FHJTUFSGPS'PSVN ^ ^ @virajkhatavkar

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DMBTT 4VCTDSJQUJPO$POUSPMMFS \ QVCMJD GVODUJPO TUPSF \ 4JHO6QUIFVTFS#VU IPX 3FHVMBS4VCTDSJCFS +PJOJOHB5FBN 3FHJTUFSGPS'PSVN ^ ^ @virajkhatavkar

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DMBTT 4VCTDSJQUJPO$POUSPMMFS \ QVCMJD GVODUJPO TUPSF \ 4JHO6QUIFVTFS#VU IPX 3FHVMBS4VCTDSJCFS +PJOJOHB5FBN 3FHJTUFSGPS'PSVN ^ ^ @virajkhatavkar

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DMBTT 4VCTDSJQUJPO$POUSPMMFS \ QVCMJD GVODUJPO TUPSF 3FRVFTUSFRVFTU \ JG SFRVFTUIBT bGPSVN` \ 3FHJTUFSGPS'PSVN ^ JG SFRVFTUIBT bQBJE@TVCTDSJQUJPO` \ 4VCTDSJCFUPQBJEQMBO ^ JG SFRVFTUIBT bKPJO@B@UFBN` \ 4VCTDSJCFUPBOFYJTUJOHUFBNBDDPVOU ^ ^ ^ @virajkhatavkar

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453"5&(:1"55&3/ @virajkhatavkar

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%FGJOFBGBNJMZPG BMHPSJUINT FODBQTVMBUFFBDI POF BOENBLFUIFN JOUFSDIBOHFBCMF @virajkhatavkar

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@virajkhatavkar

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"DUJPOJUFNT *EFOUJGZBQPJOUPGGMFYJCJMJUZ &YUSBDUFBDITUSBUFHZJOUPJUTPXO DMBTT "EIFSFFBDITUSBUFHZUPBDPOUSBDU %FUFSNJOFUIFQSPQFSTUSBUFHZBOEMFU JUIBOEMFUIFUBTL @virajkhatavkar

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"DUJPOJUFNT *EFOUJGZBQPJOUPGGMFYJCJMJUZ &YUSBDUFBDITUSBUFHZJOUPJUTPXO DMBTT "EIFSFFBDITUSBUFHZUPBDPOUSBDU %FUFSNJOFUIFQSPQFSTUSBUFHZBOEMFU JUIBOEMFUIFUBTL @virajkhatavkar

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"DUJPOJUFNT *EFOUJGZBQPJOUPGGMFYJCJMJUZ &YUSBDUFBDITUSBUFHZJOUPJUTPXO DMBTT "EIFSFFBDITUSBUFHZUPBDPOUSBDU %FUFSNJOFUIFQSPQFSTUSBUFHZBOEMFU JUIBOEMFUIFUBTL @virajkhatavkar

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"DUJPOJUFNT *EFOUJGZBQPJOUPGGMFYJCJMJUZ &YUSBDUFBDITUSBUFHZJOUPJUTPXO DMBTT "EIFSFFBDITUSBUFHZUPBDPOUSBDU %FUFSNJOFUIFQSPQFSTUSBUFHZBOEMFU JUIBOEMFUIFUBTL @virajkhatavkar

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*EFOUJGZBQPJOUPGGMFYJCJMJUZ • 3FHVMBS4VCTDSJCFS • +PJOB5FBN • 3FHJTUFSGPS'PSVN @virajkhatavkar

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"DUJPOJUFNT *EFOUJGZBQPJOUPGGMFYJCJMJUZ &YUSBDUFBDITUSBUFHZJOUPJUTPXO DMBTT "EIFSFFBDITUSBUFHZUPBDPOUSBDU %FUFSNJOFUIFQSPQFSTUSBUFHZBOEMFU JUIBOEMFUIFUBTL @virajkhatavkar

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DMBTT 3FHJTUFST3FHVMBS4VCTDSJCFS \ ^ @virajkhatavkar

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DMBTT 3FHJTUFST5FBN.FNCFS \ ^ @virajkhatavkar

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DMBTT 3FHJTUFST'PSVN6TFS \ ^ @virajkhatavkar

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"DUJPOJUFNT *EFOUJGZBQPJOUPGGMFYJCJMJUZ &YUSBDUFBDITUSBUFHZJOUPJUTPXO DMBTT "EIFSFFBDITUSBUFHZUPBDPOUSBDU %FUFSNJOFUIFQSPQFSTUSBUFHZBOEMFU JUIBOEMFUIFUBTL @virajkhatavkar

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JOUFSGBDF 3FHJTUFST6TFS \ ^ @virajkhatavkar

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JOUFSGBDF3FHJTUFST6TFS \ QVCMJD GVODUJPO IBOEMF ^ @virajkhatavkar

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DMBTT 3FHJTUFST3FHVMBS4VCTDSJCFS JNQMFNFOUT 3FHJTUFST6TFS \ QVCMJD GVODUJPO IBOEMF \ -PHJDGPS3FHJTUFSJOHB3FHVMBS4VCTDSJCFS ^ ^ @virajkhatavkar

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DMBTT 3FHJTUFST5FBN.FNCFS JNQMFNFOUT 3FHJTUFST6TFS \ QVCMJD GVODUJPO IBOEMF \ -PHJDGPS+PJOJOHUPB5FBN ^ ^ @virajkhatavkar

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DMBTT 3FHJTUFST'PSVN6TFS JNQMFNFOUT 3FHJTUFST6TFS \ QVCMJD GVODUJPO IBOEMF \ -PHJDGPS3FHJTUFSJOHBTB'PSVN6TFS ^ ^ @virajkhatavkar

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"DUJPOJUFNT *EFOUJGZBQPJOUPGGMFYJCJMJUZ &YUSBDUFBDITUSBUFHZJOUPJUTPXO DMBTT "EIFSFFBDITUSBUFHZUPBDPOUSBDU %FUFSNJOFUIFQSPQFSTUSBUFHZBOEMFU JUIBOEMFUIFUBTL @virajkhatavkar

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DMBTT 4VCTDSJQUJPO$POUSPMMFS \ QVCMJD GVODUJPO TUPSF 3FRVFTUSFRVFTU \ ^ QSPUFDUFEGVODUJPO TUSBUFHZ \ JG SFRVFTUIBT bQBJE@TVCTDSJQUJPO` \ SFUVSO OFX3FHJTUFST3FHVMBS4VCTDSJCFS ^ JG SFRVFTUIBT bKPJO@B@UFBN` \ SFUVSO OFX3FHJTUFST5FBN.FNCFS ^ SFUVSO OFX3FHJTUFST'PSVN6TFS ^ ^ @virajkhatavkar

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DMBTT 4VCTDSJQUJPO$POUSPMMFS \ QVCMJD GVODUJPO TUPSF 3FRVFTUSFRVFTU \ UIJTTUSBUFHZ SFRVFTU IBOEMF ^ QSPUFDUFEGVODUJPO TUSBUFHZ SFRVFTU \ JG SFRVFTUIBT bQBJE@TVCTDSJQUJPO` \ SFUVSO OFX3FHJTUFST3FHVMBS4VCTDSJCFS ^ JG SFRVFTUIBT bKPJO@B@UFBN` \ SFUVSO OFX3FHJTUFST5FBN.FNCFS ^ SFUVSO OFX3FHJTUFST'PSVN6TFS ^ ^ @virajkhatavkar

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DMBTT 4VCTDSJQUJPO$POUSPMMFS \ QVCMJD GVODUJPO TUPSF 3FRVFTUSFRVFTU \ UIJTTUSBUFHZ SFRVFTU IBOEMF ^ QSPUFDUFEGVODUJPOTUSBUFHZ SFRVFTU \ JG SFRVFTUIBT bQBJE@TVCTDSJQUJPO` \ SFUVSOOFX3FHJTUFST3FHVMBS4VCTDSJCFS ^ JG SFRVFTUIBT bKPJO@B@UFBN` \ SFUVSOOFX3FHJTUFST5FBN.FNCFS ^ SFUVSOOFX3FHJTUFST'PSVN6TFS ^ ^ @virajkhatavkar

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DMBTT 4VCTDSJQUJPO$POUSPMMFS \ QVCMJD GVODUJPO TUPSF 3FRVFTUSFRVFTU 'BDUPSZ GBDUPSZ \ GBDUPSZHFU4USBUFHZ SFRVFTU IBOEMF ^ QSPUFDUFEGVODUJPOTUSBUFHZ SFRVFTU \ JG SFRVFTUIBT bQBJE@TVCTDSJQUJPO` \ SFUVSOOFX3FHJTUFST3FHVMBS4VCTDSJCFS ^ JG SFRVFTUIBT bKPJO@B@UFBN` \ SFUVSOOFX3FHJTUFST5FBN.FNCFS ^ SFUVSOOFX3FHJTUFST'PSVN6TFS ^ ^ @virajkhatavkar

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@virajkhatavkar

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"SDIJUFDUVSF%FDJTJPO WT %FTJHO%FDJTJPO @virajkhatavkar

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"SDIJUFDUVSF%FDJTJPO WT %FTJHO%FDJTJPO @virajkhatavkar

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"SDIJUFDUVSF%FDJTJPO WT %FTJHO%FDJTJPO @virajkhatavkar

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"EFTJHOSFQSFTFOUTPOF QPJOUJOUIFQPUFOUJBM EFDJTJPOTQBDF @virajkhatavkar

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"MMBSDIJUFDUVSFJTEFTJHOCVU OPUBMMEFTJHOJTBSDIJUFDUVSF @virajkhatavkar

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"SDIJUFDUVSFSFQSFTFOUTUIF TJHOJGJDBOUEFTJHOEFDJTJPOTUIBU TIBQFBTZTUFN XIFSF TJHOJGJDBODFJTNFBTVSFECZDPTU PGDIBOHF @virajkhatavkar

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5ZQJDBM$POUSPMMFS @virajkhatavkar

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QVCMJDGVODUJPO TUPSF 3FRVFTUSFRVFTU \ UBTL OFX 5BTL UBTLUJUMFSFRVFTUUJUMF UBTLEVF@EBUF SFRVFTUEVF@EBUF JG UBTLTBWF \ 4FOE&NBJMUPUFBNNFNCFST /PUJGZ5FBN-FBEFS -PH"DUJPO 4FU$30/+PCGPSSFNJOEFST SFUVSO UIJTSFEJSFDU bFEJU@QBHF` ^ UISPX OFX /PU'PVOE&YDFQUJPO ^ @virajkhatavkar

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@virajkhatavkar

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*OEFGFOTFPG$36% UIJTJT QFSGFDUMZ0,J "EWJDF'PSTNBMMBQQT @virajkhatavkar

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@virajkhatavkar .PEFM %PNBJO-BZFS $POUSPMMFS 7JFX

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@virajkhatavkar .PEFM 4FSWJDF-BZFS $POUSPMMFS 7JFX %PNBJO-BZFS

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$PNNBOEPSJFOUFE BSDIJUFDUVSF @virajkhatavkar

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$PNNBOET • $PNNBOETBSFTJNQMF%50T • 5IFJSPOMZSFTQPOTJCJMJUZJTUPDPOUBJOJOGPSNBUJPO @virajkhatavkar

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DMBTT $SFBUF5BTL$PNNBOE \ QVCMJD OBNF QVCMJD EVF@EBUF QVCMJDGVODUJPO @@DPOTUSVDU UBTL@OBNF EVF@EBUF \ UIJTOBNF UBTL@OBNF UIJTEVF@EBUF EVF@EBUF ^ ^ @virajkhatavkar

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$0.."/% 1SFTFOUBUJPO-BZFS 4FSWJDF-BZFS $0.."/% )"/%-&3 @virajkhatavkar

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$0.."/% 1SFTFOUBUJPO-BZFS 4FSWJDF-BZFS $0.."/% )"/%-&3 @virajkhatavkar

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$0.."/% 1SFTFOUBUJPO-BZFS 4FSWJDF-BZFS $0.."/% )"/%-&3 $0.."/% #64 @virajkhatavkar

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DMBTT $SFBUF5BTL$PNNBOE \ QVCMJD OBNF QVCMJD EVF@EBUF QVCMJDGVODUJPO @@DPOTUSVDU UBTL@OBNF EVF@EBUF \ UIJTOBNF UBTL@OBNF UIJTEVF@EBUF EVF@EBUF ^ ^ @virajkhatavkar

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DMBTT $SFBUF5BTL$PNNBOE)BOEMFS \ QVCMJDGVODUJPO@@DPOTUSVDU 5BTLUBTL .BJMFSNBJMFS \ UIJTUBTLUBTL UIJTNBJMFSNBJMFS ^ ^ @virajkhatavkar

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DMBTT $SFBUF5BTL$PNNBOE)BOEMFS \ QVCMJDGVODUJPO @@DPOTUSVDU 5BTL UBTL .BJMFS NBJMFS \ UIJTUBTL UBTL UIJTNBJMFS NBJMFS ^ ^ @virajkhatavkar

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DMBTT $SFBUF5BTL$PNNBOE)BOEMFS \ QVCMJDGVODUJPO @@DPOTUSVDU 5BTL UBTL .BJMFS NBJMFS \ UIJTUBTL UBTL UIJTNBJMFS NBJMFS ^ QVCMJDGVODUJPO IBOEMF $SFBUF5BTL$PNNBOE DPNNBOE \ ^ ^ @virajkhatavkar

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QVCMJD GVODUJPO IBOEMF $SFBUF5BTL$PNNBOE DPNNBOE \ ^ @virajkhatavkar This function is responsible for carrying out all the sequential tasks

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QVCMJDGVODUJPO IBOEMF $SFBUF5BTL$PNNBOE DPNNBOE \ UIJTUBTLUJUMFDPNNBOEUJUMF UIJTUBTLEVF@EBUF DPNNBOEEVF@EBUF JG UIJTUBTLTBWF \ 4FOE&NBJM 4FU$SPO +PCT 8SBQJOB%#5SBOTBDUJPO ^ ^ @virajkhatavkar

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DMBTT $SFBUF5BTL$PNNBOE)BOEMFS \ QVCMJDGVODUJPO @@DPOTUSVDU 5BTL UBTL .BJMFS NBJMFS \ UIJTUBTL UBTL UIJTNBJMFS NBJMFS ^ QVCMJDGVODUJPO IBOEMF $SFBUF5BTL$PNNBOE DPNNBOE \ UIJTUBTLUJUMFDPNNBOEUJUMF UIJTUBTLEVF@EBUF DPNNBOEEVF@EBUF JG UIJTUBTLTBWF \ 4FOE&NBJM 4FU$SPO +PCT 8SBQJOB%#5SBOTBDUJPO ^ ^ ^ @virajkhatavkar

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$POUSPMMFS QVCMJDGVODUJPO TUPSF 3FRVFTUSFRVFTU \ DPNNBOE OFX $SFBUF5BTL$PNNBOE SFRVFTUOBNF SFRVFTUEVF@EBUF UIJTDPNNBOE#VTFYFDVUF DPNNBOE SFUVSO UIJTSFEJSFDU bFEJU@QBHF` ^ @virajkhatavkar

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CREATE TASK COMMAND Presentation Layer @virajkhatavkar

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CREATE TASK COMMAND Presentation Layer Service Layer CREATE TASK COMMAND HANDLER COMMAND BUS @virajkhatavkar

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6TFDBTF @virajkhatavkar

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CLI WEB API @virajkhatavkar

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CLI Command WEB API @virajkhatavkar

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CLI Command WEB API @virajkhatavkar

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&WFOUTJ @virajkhatavkar

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&YBNQMFTPGFWFOUT • 6TFS3FHJTUFSFE • 1PTUMJLFE • 6TFS5BHHFE • 1BTTXPSE$IBOHFE @virajkhatavkar

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Events (are fired) @virajkhatavkar

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Events (are fired) Listeners Are caught by @virajkhatavkar

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Listeners Services dispatch @virajkhatavkar

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DMBTT $SFBUF5BTL$PNNBOE)BOEMFS \ QVCMJDGVODUJPO @@DPOTUSVDU 5BTL UBTL .BJMFS NBJMFS \ UIJTUBTL UBTL UIJTNBJMFS NBJMFS ^ QVCMJDGVODUJPO IBOEMF $SFBUF5BTL$PNNBOE DPNNBOE \ UIJTUBTLUJUMFDPNNBOEUJUMF UIJTUBTLEVF@EBUF DPNNBOEEVF@EBUF JG UIJTUBTLTBWF \ NBJMFSUBTL$SFBUFE UBTL ^ ^ ^ @virajkhatavkar Task Created event

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DMBTT $SFBUF5BTL$PNNBOE)BOEMFS \ QVCMJDGVODUJPO @@DPOTUSVDU 5BTL UBTL \ UIJTUBTL UBTL ^ QVCMJDGVODUJPO IBOEMF $SFBUF5BTL$PNNBOE DPNNBOE \ UIJTUBTLUJUMFDPNNBOEUJUMF UIJTUBTLEVF@EBUF DPNNBOEEVF@EBUF JG UIJTUBTLTBWF \ FWFOUOFX &WFOU UIJTFWFOU.BOBHFS EJTQBUDI FWFOU ^ ^ ^ @virajkhatavkar

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DMBTT $SFBUF5BTL$PNNBOE)BOEMFS \ QVCMJDGVODUJPO @@DPOTUSVDU 5BTL UBTL \ UIJTUBTL UBTL ^ QVCMJDGVODUJPO IBOEMF $SFBUF5BTL$PNNBOE DPNNBOE \ UIJTUBTLUJUMFDPNNBOEUJUMF UIJTUBTLEVF@EBUF DPNNBOEEVF@EBUF JG UIJTUBTLTBWF \ FWFOU OFX &WFOU UIJTFWFOU.BOBHFS EJTQBUDI FWFOU ^ ^ ^ @virajkhatavkar

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TaskCreatedEvent (is fired) TaskCreatedListener caught by @virajkhatavkar

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Log Info TaskCreatedListener Set Cron Job Send Email @virajkhatavkar

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$-&"/"3$)*5&$563& • *OEFQFOEFOUPGGSBNFXPSLT @virajkhatavkar

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$-&"/"3$)*5&$563& • *OEFQFOEFOUPGGSBNFXPSLT • 5FTUBCMF @virajkhatavkar

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$-&"/"3$)*5&$563& • *OEFQFOEFOUPGGSBNFXPSLT • 5FTUBCMF • *OEFQFOEFOUPG6* @virajkhatavkar

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$-&"/"3$)*5&$563& • *OEFQFOEFOUPGGSBNFXPSLT • 5FTUBCMF • *OEFQFOEFOUPG6* • *OEFQFOEFOUPG%BUBCBTF @virajkhatavkar

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$-&"/"3$)*5&$563& • *OEFQFOEFOUPGGSBNFXPSLT • 5FTUBCMF • *OEFQFOEFOUPG6* • *OEFQFOEFOUPG%BUBCBTF • *OEFQFOEFOUPGFYUFSOBMBHFODZ @virajkhatavkar

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$234

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@virajkhatavkar

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"CPVU.F • 'PVOEFS )FBEPG5FDIOPMPHZ • 1)1 • 6*69 • "OHVMBS+4 • WJSBK!UBOUSBHZBODPN • !WJSBKLIBUBWLBS @virajkhatavkar 5BOUSB(ZBO