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EventSourcing for Java

Home Page: https://rahulsom.github.io/grooves

License: Apache License 2.0

Groovy 19.56% Java 45.45% CSS 7.52% Kotlin 25.47% HTML 1.51% SCSS 0.49%

cqrs eventsourcing groovy java kotlin

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huaxiawang anjalivartak cnguyen6-certify dvsi1986 renovate-tests

grooves's Issues

Depshield will be deprecated on Monday December 12th

Please install our new product, Sonatype Lift with advanced features

Upgrade grails example projects to 3.3

This should allow moving off to gradle 4, and eventually support/test java 9.

Fix redirects in versioned snapshots

One line is commented out to show what is broken.

grooves/grooves-example-test/src/main/groovy/com/github/rahulsom/grooves/test/AbstractPatientSpec.groovy

Line 322 in befef88

// 6 | 4 || 'Sarah Palin' | 148.68 // Redirect to correct version to pass

Fixing the redirects should allow uncommenting that line.

Separate diagramming into it's own module

This can help users render their own diagrams.

Support additive rollups

Currently rollups are computed as

departmentEmployeeJoin
   .computeSnapshot(id, dateOrVersion)
   .flatMap { fromIterator(it.joinedIds) }
   .flatMap { employeeQuery.computeSnapshot(it) }
   .reduce (new DepartmentSummary()) { rollup, snapshot -> ... }

There isn't much potential to do this additively.

If we can do it differently, and this works, we could try this

departmentEmployeeJoin
   .computeSnapshot(id, dateOrVersion)
   .flatMap { getAllEventsForAfterDateOrVersion(it.joinedIds, dateOrVersion) }
   .reduce (new DepartmentSummary()) {rollup, event -> ... }

The challenge is reducing

The number of events fetched
The number of computations performed
The number of scenarios requiring a full recompute

Implement completeness of queries in java

A potential solution could be implementing similar annotations to groovy with aspectj.

Add example using rx-gorm-mongo

Migrate springboot-jpa to RxJava2

This allows for testing and documenting RxJava2 in addition to Reactor and RxJava1.

Dependency Dashboard

This issue lists Renovate updates and detected dependencies. Read the Dependency Dashboard docs to learn more.

Open

These updates have all been created already. Click a checkbox below to force a retry/rebase of any.

chore(deps): update dependency popper.js to v2.11.7
chore(deps): update plugin com.gradle.enterprise to v3.12.6
chore(deps): update plugin org.flywaydb.flyway to v9.16.1
chore(deps): update plugin org.springframework.boot to v3.0.5
fix(deps): update groovy monorepo to v4.0.10 (org.apache.groovy:groovy-xml, org.apache.groovy:groovy-json, org.apache.groovy:groovy-dateutil, org.apache.groovy:groovy-all, org.apache.groovy:groovy)
chore(deps): update dependency gradle to v8
chore(deps): update plugin com.sourcemuse.mongo to v2
chore(deps): update plugin io.freefair.aspectj.post-compile-weaving to v8
Click on this checkbox to rebase all open PRs at once

Ignored or Blocked

These are blocked by an existing closed PR and will not be recreated unless you click a checkbox below.

Detected dependencies

github-actions

.github/workflows/build.yml

gradle

gradle.properties

settings.gradle.kts

com.gradle.enterprise 3.12.4

build.gradle.kts

com.github.rahulsom.waena.root 0.6.1

org.jetbrains.kotlin.jvm 1.8.10

org.jetbrains.kotlin.plugin.allopen 1.8.10

org.jlleitschuh.gradle.ktlint 11.3.1

org.springframework.boot 3.0.4

io.spring.dependency-management 1.1.0

org.sonarqube 4.0.0.2929

me.champeau.buildscan-recipes 0.2.3

com.sourcemuse.mongo 1.0.7

gradle/jacoco.gradle

jacoco 0.8.8

gradle/libs.versions.toml

javax.activation:activation 1.1.1

org.asciidoctor:asciidoctorj 2.5.7

org.aspectj:aspectjrt 1.9.19

org.assertj:assertj-core 3.24.2

org.awaitility:awaitility 4.2.0

commons-beanutils:commons-beanutils 1.9.4

com.google.auto.service:auto-service 1.0.1

com.google.testing.compile:compile-testing 0.21.0

com.google.inject:guice 5.1.0

com.google.guava:guava 31.1-jre

org.apache.groovy:groovy 4.0.9

org.apache.groovy:groovy-all 4.0.9

org.apache.groovy:groovy-dateutil 4.0.9

org.apache.groovy:groovy-json 4.0.9

org.apache.groovy:groovy-xml 4.0.9

com.h2database:h2 2.1.214

javax:javaee-api 8.0.1

javax.xml.bind:jaxb-api 2.3.1

io.openliberty.features:jaxrs-2.1 23.0.0.2

javax.annotation:javax.annotation-api 1.3.2

org.junit.jupiter:junit-jupiter-api 5.9.2

org.junit.jupiter:junit-jupiter-engine 5.9.2

org.junit.jupiter:junit-jupiter-params 5.9.2

org.apache.commons:commons-lang3 3.12.0

org.apache.logging.log4j:log4j-core 2.20.0

org.apache.logging.log4j:log4j-slf4j-impl 2.20.0

ch.qos.logback:logback-classic 1.4.6

org.projectlombok:lombok 1.18.26

com.squareup.okhttp3:okhttp 4.10.0

org.reactivestreams:reactive-streams 1.0.4

io.reactivex:rxjava 1.2.1

io.reactivex:rxjava-reactive-streams 1.2.1

io.reactivex.rxjava2:rxjava 2.2.21

org.slf4j:slf4j-api 2.0.7

org.slf4j:slf4j-simple 2.0.7

org.spockframework:spock-core 2.3-groovy-4.0

org.spockframework:spock-spring 2.3-groovy-4.0

org.jetbrains:annotations 24.0.1

io.spring.asciidoctor:spring-asciidoctor-extensions-block-switch 0.6.1

com.sun.xml.bind:jaxb-core 4.0.2

com.sun.xml.bind:jaxb-impl 4.0.2

com.github.rahulsom:svg-builder 0.5.0

gradle/codenarc/codenarc.gradle

codenarc 3.2.0

grooves-api/build.gradle.kts

grooves-core/build.gradle.kts

dev.jacomet.logging-capabilities 0.+

io.freefair.aspectj.post-compile-weaving 6.6.3

grooves-diagrams/build.gradle.kts

io.miret.etienne.sass 1.4.2

grooves-docs/build.gradle.kts

org.ajoberstar.git-publish 2.1.3

org.asciidoctor.jvm.convert 3.3.2

grooves-example-javaee/build.gradle

io.openliberty.tools.gradle.Liberty 3.5.2

grooves-example-pushstyle/build.gradle

nu.studer.jooq 8.1

org.flywaydb.flyway 9.16.0

grooves-example-springboot-jpa/build.gradle.kts

grooves-example-springboot-kotlin/build.gradle.kts

io.projectreactor.addons:reactor-test 3.0.7.RELEASE

grooves-example-test/build.gradle.kts

xerces:xercesImpl 2.12.2

org.apache.httpcomponents:httpclient 4.5.14

grooves-groovy/build.gradle.kts

grooves-java/build.gradle.kts

grooves-types/build.gradle.kts

gradle-wrapper

gradle/wrapper/gradle-wrapper.properties

gradle 7.6.1

html

grooves-docs/src/docs/asciidoc/docinfo-footer.html

jquery 3.6.4@sha512-pumBsjNRGGqkPzKHndZMaAG+bir374sORyzM3uulLV14lN5LyykqNk8eEeUlUkB3U0M4FApyaHraT65ihJhDpQ==

grooves-site/index.html

jquery 3.6.4@sha512-6DC1eE3AWg1bgitkoaRM1lhY98PxbMIbhgYCGV107aZlyzzvaWCW1nJW2vDuYQm06hXrW0As6OGKcIaAVWnHJw==

popper.js 2.11.6@sha512-6UofPqm0QupIL0kzS/UIzekR73/luZdC6i/kXDbWnLOJoqwklBK6519iUnShaYceJ0y4FaiPtX/hRnV/X/xlUQ==

Check this box to trigger a request for Renovate to run again on this repository

Create FRP Style Queries

The current ones are very object oriented. Here's my plan for it.

def query = Grooves.temporal().
    snapshotsFrom {Date maxTimestamp, AggregateT aggregate -> 
      ? as Publisher<SnapshotT>
    }.
    eventsFrom {AggregateT aggregate, SnapshotT lastSnapshot, Date snapshotTime -> 
      ? as Publisher<EventT>
    }.
    onException {Exception e, SnapshotT snapshot, EventT event ->
      ? as Publisher<EventApplyOutcome>
    }.
    on(MyFirstEvent.class) {MyFirstEvent event, SnapshotT snapshot ->
      ? as Publisher<EventApplyOutcome>
    }.
    on(MySecondEvent.class) {MySecondEvent event, SnapshotT snapshot ->
      ? as Publisher<EventApplyOutcome>
    }.
    build()

query.computeSnapshot(aggregate, new Date()).subscribe(...)

Open questions:

How do we verify completeness of queries across all languages?
Can we get 1 at compile time?
Does this make Grooves any better?

Add Homepage

Current manual is at https://rahulsom.github.io/grooves/manual/current

https://rahulsom.github.io/grooves needs a landing page.

Action Required: Fix Renovate Configuration

There is an error with this repository's Renovate configuration that needs to be fixed. As a precaution, Renovate will stop PRs until it is resolved.

Error type: undefined. Note: this is a nested preset so please contact the preset author if you are unable to fix it yourself.

Add examples in docs for joins

Joins are currently only performed in one example project.
It might be a good idea to perform joins in all projects so they can be documented in all styles.

Add example for push style event sourcing

Currently, we query the events when computing snapshots. A lot of event sourcing frameworks are built around push, i.e. a kafka stream with the event causes snapshots to be computed. There is no turning around and querying the source of truth for the event.

In our case, it would mean, we always precompute snapshots. This reduces the cost of computation at read time. The downside of such a system would be, it won't support reverts.

For some applications, that is not a big problem.

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