Managing Business Processes in Microservice Architecture with Spring Ecosystem

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MANAGING BUSINESS PROCESSES IN MICROSERVICE ARCHITECTURE WITH SPRING ECOSYSTEM BARTŁOMIEJ SŁOTA @bartekslota

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$8bn* in 2018 * Global Business Process Management Market report by Value Market Research, 2019

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$18,5bn* by 2025 * Global Business Process Management Market report by Value Market Research, 2019

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How to reconcile BPMS with microservices?

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BARTŁOMIEJ SŁOTA Consultant @ Software Engineer Speaker Blogger @bartekslota bartslota.blogspot.com bartlomiej.slota@gmail.com github.com/bslota linkedin.com/in/bslota

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BRUCE ➤ Software engineer ➤ 7 years of experience ➤ Works on automating business processes ➤ Passionate about microservices ➤ Struggles to apply microservices into BPMS

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WHAT ARE MICROSERVICES? Autonomy Resilience Data Deployment Technology Scalability People

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MICROSERVICES Autonomy Resilience Data Deployment Technology Scalability People Source: Robert C. Martin Clean Architecture

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MICROSERVICES Autonomy Resilience Data Deployment Technology Scalability People Source: Robert C. Martin Clean Architecture

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MICROSERVICES Autonomy Resilience Data Deployment Technology Scalability People App #1 Source: www.trunkbaseddevelopment.com App #2 Source: www.leanpub.com/git-flow/read

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MICROSERVICES Autonomy Resilience Data Deployment Technology Scalability People App #1 App #2 App #3

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MICROSERVICES Autonomy Resilience Data Deployment Technology Scalability People

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MICROSERVICES Autonomy Resilience Data Deployment Technology Scalability People App #2 App #1

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Resilience MICROSERVICES Autonomy Data Deployment Technology Scalability People BE FE QA PO

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Ignorance is coded, committed and pushed to Git

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THE BUSINESS FLOW Source: Alberto Brandolini EventStorming

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THE BUSINESS FLOW Based on: Alberto Brandolini EventStorming HARD TO SOLVE HARD TO DISCUSS HARD TO VISUALIZE

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THE BUSINESS FLOW VS MICROSERVICES App #2 App #3 App #4 App #1 Based on: Alberto Brandolini EventStorming

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BPM - THE BUSINESS PERSPECTIVE Process Modeler Common UI System integration Reporting Workflow Engine

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BPM - ARCHITECTURE PERSPECTIVE

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BPM - ARCHITECTURE PERSPECTIVE

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BPM - ARCHITECTURE PERSPECTIVE

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BPM - ARCHITECTURE PERSPECTIVE

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BPM - ARCHITECTURE PERSPECTIVE Autonomy Resilience Data Deployment Technology Scalability People

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BPM - HOW DEVELOPER MIGHT PERCEIVE IT?

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SAMPLE PROCESS - EVENT STORMING

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SAMPLE PROCESS

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SAMPLE PROCESS Customer Contact AML Authorizer Based on: Alberto Brandolini EventStorming

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ASYNCHRONOUS CHOREOGRAPHY

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ASYNCHRONOUS ORCHESTRATION

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SAGAS

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ARCHITECTURE

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ARCHITECTURE

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ARCHITECTURE

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CONVENTION OVER CONFIGURATION @JsonSubTypes({ @JsonSubTypes.Type(name = „processInstanceCreated", value = ProcessInstanceCreated.class), @JsonSubTypes.Type(name = "processInstanceCancelled", value = ProcessInstanceCancelled.class), @JsonSubTypes.Type(name = "processInstanceCompleted", value = ProcessInstanceCompleted.class), @JsonSubTypes.Type(name = "taskCreated", value = TaskCreated.class), @JsonSubTypes.Type(name = "taskProcessingFailed", value = TaskProcessingFailed.class), @JsonSubTypes.Type(name = "taskCompleted", value = TaskCompleted.class), @JsonSubTypes.Type(name = "taskAssigned", value = TaskAssigned.class) }) public interface BPMEvent { }

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PROCESS ORCHESTRATION public interface AddressChangeProcessChannels { String ADDRESS_CHANGE_PROCESS_COMMANDS = "addressChangeProcessCommands"; String ADDRESS_CHANGE_PROCESS_EVENTS = "processEvents"; @Input(ADDRESS_CHANGE_PROCESS_COMMANDS) SubscribableChannel addressChangeProcessCommands(); @Output(ADDRESS_CHANGE_PROCESS_EVENTS) MessageChannel addressChangeProcessEvents(); }

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PROCESS ORCHESTRATION public interface AccessVerificationChannels { String ACCESS_EVENTS = "accessEvents"; String ACCESS_COMMANDS = "accessCommands"; @Input(ACCESS_EVENTS) SubscribableChannel accessEvents(); @Output(ACCESS_COMMANDS) MessageChannel accessCommands(); } public interface AddressChannels { String ADDRESS_EVENTS = "addressEvents"; String ADDRESS_COMMANDS = "addressCommands"; @Input(ADDRESS_EVENTS) SubscribableChannel addressEvents(); @Output(ADDRESS_COMMANDS) MessageChannel addressCommands(); } public interface AMLChannels { String ADDRESS_EVENTS = "amlEvents"; String ADDRESS_COMMANDS = "amlCommands"; @Input(ADDRESS_EVENTS) SubscribableChannel amlEvents(); @Output(ADDRESS_COMMANDS) MessageChannel amlCommands(); }

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HOW DO I KNOW THAT THE SERVICE ANSWERS TO MY PROCESS? ➤ Add the header to every message in process manager ➤ Copy the header back with the response ignoring the content @JsonCreator public ProcessMetadata(@JsonProperty("processInstanceId") String processInstanceId, @JsonProperty("parentId") String parentId, @JsonProperty("processDefinitionId") String processDefinitionId) { this.processInstanceId = processInstanceId; this.parentId = parentId; this.processDefinitionId = processDefinitionId; } class AccessVerification { private final MessageChannel accessCommands; . . . private void sendVerifyAccessCommand(ProcessMetadata metadata, String clientId, String masterPassword) { final VerifyAccess verifyAccess = new VerifyAccess(clientId, masterPassword); accessCommands.send(MessageBuilder.withPayload(verifyAccess).copyHeaders(metadata.toMap()).build()); } }

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HOW DO I GET TASKS ASSIGNED TO A USER? KTable userTasks() { return streamsBuilder .stream(„processEvents”, Consumed.with(serdes.forA(String.class), serdes.forA(Task.class))) .groupBy((key, task) -> task.getUser(), Serialized.with(serdes.forA(User.class), serdes.forA(Task.class))) .aggregate(Tasks::empty, (TaskAggregator) (user, task, tasks) -> tasks.add(task), materializedAs(„userTasks”)); }

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HOW DO I GET MY FANCY REPORTS?

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HOW DO I MONITOR MY PROCESSES? ➤ Spring Cloud Sleuth ➤ Zipkin ➤ ELK ➤ Prometheus ➤ Semantic monitoring

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PROCESS VS SERVICE OWNERSHIP PROCESS #3 PROCESS #2 PROCESS #1 BE FE QA PO ?

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ENTERPRISE INTEGRATION PATTERNS YOU WILL USE (SUB)CONSCIOUSLY ➤ Command message ➤ Event message ➤ Process manager ➤ Transactional client ➤ Event driven consumer ➤ Idempotent receiver ➤ …

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BPM - THE BUSINESS PERSPECTIVE REVISITED Process Modeler Common UI System integration Reporting N x Process Orchestrators

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BPM - ARCHITECTURE PERSPECTIVE REVISITED Autonomy Resilience Data Deployment Technology Scalability People

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BPM - DEVELOPER PERSPECTIVE REVISITED

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DDD BY EXAMPLES - LIBRARY

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THANK YOU! @bartekslota bartslota.blogspot.com bartlomiej.slota@gmail.com github.com/bslota linkedin.com/in/bslota