Alfresco Devcon 2019 - Lightning Talk - The Alfresco fat JAR experiment
- 1. The Alfresco fat JAR experiment Axel Faust @ReluctantBird83
- 2. Learn. Connect. Collaborate. Fat JAR Executable Repo JAR Content Services ROOT / _vti_bin Share Services Addons Office Services
- 3. Learn. Connect. Collaborate. Fat JAR Executable Repo JAR Content Services ROOT / _vti_bin Share Services Addons Office Services Share Addons Executable Share JAR
- 4. Learn. Connect. Collaborate. Fat JAR – But why? A universal, polyglot VM Module: Substrate VM Ahead-of-Time (AOT) compilation Compilation
- 5. Learn. Connect. Collaborate. Fat JAR – But why? Seriously, why?!? + 146 MiB 12 MiB 202 MiB ACS CE 6.1.1 60s – 3m (YMMV)
- 6. Learn. Connect. Collaborate. Fat JAR – But why? Seriously, why?!? + 146 MiB 12 MiB 202 MiB ACS CE 6.1.1 60s – 3m (YMMV) Compilation ?? < 180 MiB ?? < 10s <Immutable>
- 7. Learn. Connect. Collaborate. Step 1: Deal with Maven mess Alfresco != good at Maven • 5.2.f: antlr 2.7.7 + 3.5.2 • Distribution BOM is dead Task #1: Create BOM from GA WAR Task #2: Find + eliminate duplicates
- 8. Learn. Connect. Collaborate. Step 1: Deal with Maven mess Task #1: Create BOM from GA WAR • Tool: artifact-lookup-maven-plugin • Output: <dependencies> block mvn com.codspire.plugins:artifact-lookup-maven-plugin:lookup Results • 291 <dependency> • 1 failure (slf4j-api) • +2 failures w/ proprietary AOS
- 9. Learn. Connect. Collaborate. Step 1: Deal with Maven mess Task #2: Find + eliminate duplicates • Tool: maven-shade-plugin • Reveals conflicts – filters for cleanup • Bonus: “simple” fat JAR for next steps
- 10. Learn. Connect. Collaborate. Step 1: Deal with Maven mess Task #2: Find + eliminate duplicates • Tool: maven-shade-plugin • Reveals conflicts – filters for cleanup • Bonus: “simple” fat JAR for next steps Results • 11 JAR + 372 class conflicts • 1 redundant JAR • Share: 38 class conflicts • ALF-22021 – 22029, ALF-22053
- 11. Learn. Connect. Collaborate. Step 2: Jetty launcher Task #3: Integrate / merge webapps • Tool: maven-dependency-plugin:unpack • Filter unwanted WEB-INF content • Target: /webapps/<name>/
- 12. Learn. Connect. Collaborate. Step 2: Jetty launcher Task #3: Integrate / merge webapps • Tool: maven-dependency-plugin:unpack • Filter unwanted WEB-INF content • Target: /webapps/<name>/ Challenge: unpack “simple” fat JAR • ACS: ~89k files = ~12 min • Shade unsuitable: path relocation => rewrite
- 13. Learn. Connect. Collaborate. Step 2: Jetty launcher Task #4: Integrate / start Jetty • Shade in Jetty JARs • Simple CLI main class (init + config) • Custom classloader per webapp
- 14. Learn. Connect. Collaborate. Step 2: Jetty launcher Task #4: Integrate / start Jetty • Shade in Jetty JARs • Simple CLI main class (init + config) • Custom classloader per webapp Challenge: initial ACS startup ~10 min • TLD + annotation scan (~89k files) • Custom JAR listing => 56 sec
- 15. Learn. Connect. Collaborate. Step 3: Install addons Task #5: Unpack JAR / AMP • Target 1: /webapps/alfresco/… • Target 2: /webapps/share/... Challenge: AMP-nested JARs 1) Filter + separate resolution/shade 2) Unzip via antrun
- 16. Learn. Connect. Collaborate. Step 3: Install addons Task #6: Unpack AOS WAR + AMP • Target 1: /webapps/_vti_bin/… • Target 2: /webapps/alfresco/... Challenge: JARs unavailable via Maven ● Unzip bundled JARs via antrun
- 17. Learn. Connect. Collaborate. Step 4: Fix bugs / issues Task #7: Fix resource loading • Incorrect classpath: handling (web scripts) • Incorrect webapp: handling (URL config source) • JVM / Jetty JAR handling (open/close)
- 18. Learn. Connect. Collaborate. Review: Current state https://github.com/AFaust/simple-alfresco-executables Working executable JARs • ACS 179 MiB, Share: 84 MiB • “Typical” startup time Effort ~5 person days
- 19. Learn. Connect. Collaborate. Outlook: Optimisations Pre-built TLD / annotation inventory • Avoid JAR listing • Potential: ACS ~50-60 sec, Share ~15 sec Maven: build without unpack • Shade in sub-path + AMP support • Potential: ~15-20 min
- 20. Learn. Connect. Collaborate. Outlook: Substrate VM / AOT Investigation • Rhino JS pre-compilation • AOP proxy pre-generation • Built-time AspectJ binary weaving Test new GraalVM release candidates
- 21. Learn. Connect. Collaborate. Outlook: Substrate VM / AOT Task #8: Build time inventory Task #9: Generate AOT helper • Code substitution • Feature config (reflection etc.) Task #10: Build, test, adapt, repeat...
- 22. The Alfresco fat JAR experiment Thank you!