Why you're missing out if you're not making Quarkus extensions

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Holly Cummins @holly_cummins Georgios Andrianakis @geoand86 Red Hat Why you're missing out if you're not making Quarkus extensions

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@holly_cummins @geoand86 #Quarkus #RedHat Hi Georgios!

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@holly_cummins @geoand86 #Quarkus #RedHat extenwhats?

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core JAX-RS

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT Elasticsearch

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT Elasticsearch Apache Camel

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch Apache Camel

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch Apache Camel …

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch Apache Camel …

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch Netty extension Apache Camel …

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch Netty extension Apache Camel …

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch Netty extension JAX-RS extension Apache Camel …

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch Netty extension JAX-RS extension Apache Camel …

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch Netty extension JAX-RS extension Elasticsearch extension Apache Camel …

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch Netty extension JAX-RS extension Elasticsearch extension Apache Camel …

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch Netty extension JAX-RS extension Elasticsearch extension Hibernate extension Apache Camel …

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch Netty extension JAX-RS extension Elasticsearch extension Hibernate extension Apache Camel …

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch Netty extension JAX-RS extension Elasticsearch extension Hibernate extension Apache Camel Camel extension …

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch JWT extension Netty extension JAX-RS extension Elasticsearch extension Hibernate extension Apache Camel Camel extension …

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus core Hibernate JAX-RS Netty JWT gRPC Elasticsearch gRPC extension JWT extension Netty extension JAX-RS extension Elasticsearch extension Hibernate extension Apache Camel Camel extension …

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@holly_cummins @geoand86 #Quarkus #RedHat why?

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@holly_cummins @geoand86 #Quarkus #RedHat reminder: what makes quarkus special

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traditional way vs quarkus way @   @ > build time runtime

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@   @ > traditional way vs quarkus way @   @ > build time runtime build time

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@   @ > traditional way vs quarkus way @   @ > build time runtime runtime build time

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the quarkus way enables native compilation native @   @ > JVM build time

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9 but … for a normal framework …

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9 they load way too many classes but … for a normal framework …

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9 they load way too many classes they are way too dynamic but … for a normal framework …

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9 they load way too many classes they are way too dynamic (which means they use way too much reflection) but … for a normal framework …

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9 they load way too many classes they are way too dynamic (which means they use way too much reflection) they perform a lot of initialization at runtime but … for a normal framework …

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@   @ > Packaging   (maven, gradle…) build time runtime how does a framework start?

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@   @ > Load and parse config files, properties, yaml, xml, etc. build time runtime how does a framework start?

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@   @ > Classpath scanning and annotation discovery Attempt to load class to enable/disable features build time runtime how does a framework start?

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@   @ > Build its metamodel of the world. build time runtime how does a framework start?

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@   @ > Start thread pools, IO, etc. build time runtime how does a framework start?

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Do the work once, not at each start Get rid of all bootstrap classes Less time to start, less memory needed Less or no reflection nor dynamic proxies what if we initialize at build time?

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@   @ > build time Do the work once, not at each start Get rid of all bootstrap classes Less time to start, less memory needed Less or no reflection nor dynamic proxies what if we initialize at build time?

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@   @ > runtime build time Do the work once, not at each start Get rid of all bootstrap classes Less time to start, less memory needed Less or no reflection nor dynamic proxies what if we initialize at build time?

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and another thing

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and another thing

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and another thing developer experience

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and another thing developer experience developer joy

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“while we’re manipulating the bytecode to support native, why don’t we make coding … easier?” [warning: may not actually be Quarkus origin story]

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automagic dev instances (“dev services”) unified config opinionated shortcuts joy comes in several forms:

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@holly_cummins @geoand86 #Quarkus #RedHat persistence.xml hibernate extension

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@holly_cummins @geoand86 #Quarkus #RedHat persistence.xml hibernate extension the hibernate extension makes this go away

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@holly_cummins @geoand86 #Quarkus #RedHat

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@holly_cummins @geoand86 #Quarkus #RedHat dynamic-but-static

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@holly_cummins @geoand86 #Quarkus #RedHat dynamic-but-static “wouldn’t it be nice if …   … but it’s too expensive to do it at runtime.”

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@holly_cummins @geoand86 #Quarkus #RedHat public class CassandraConnector { private Cluster cluster; private Session session; public void connect(String node, Integer port) { Builder b = Cluster.builder().addContactPoint(node); if (port != null) { b.withPort(port); } cluster = b.build(); session = cluster.connect(); } public Session getSession() { return this.session; } public void close() { session.close(); cluster.close(); } }

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@holly_cummins @geoand86 #Quarkus #RedHat “opinionated choices and educated guesses.”

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@holly_cummins @geoand86 #Quarkus #RedHat recap: why extensions? • good behaviour in native mode • fast behaviour in normal mode (pre-do all the things) • good dev experience

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@geoand86 @holly_cummins #Quarkus #RedHat

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@geoand86 @holly_cummins #Quarkus #RedHat

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@geoand86 @holly_cummins #Quarkus #RedHat

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@geoand86 @holly_cummins #Quarkus #RedHat

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@holly_cummins @geoand86 #Quarkus #RedHat why write a new extension? • the community hasn’t written one yet • it’s your library • support a use case particular to your environment

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@holly_cummins @geoand86 #Quarkus #RedHat “hook a build step?”

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@holly_cummins @geoand86 #Quarkus #RedHat “hook a build step?”

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@holly_cummins @geoand86 #Quarkus #RedHat “hook a build step?”

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@holly_cummins @geoand86 #Quarkus #RedHat how?

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@holly_cummins @geoand86 #Quarkus #RedHat extension concept deployment + runtime

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@holly_cummins @geoand86 #Quarkus #RedHat extension concept build phase + startup phase

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime bytecode

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime bytecode extension

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime bytecode extension deployment

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime bytecode extension deployment runtime

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime bytecode extension deployment runtime

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime bytecode extension deployment runtime

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime bytecode extension deployment runtime bytecode

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@holly_cummins @geoand86 #Quarkus #RedHat deployment

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@holly_cummins @geoand86 #Quarkus #RedHat understand app deployment

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@holly_cummins @geoand86 #Quarkus #RedHat understand app convert annotations to bytecode deployment

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@holly_cummins @geoand86 #Quarkus #RedHat understand app convert annotations to bytecode optimize deployment

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@holly_cummins @geoand86 #Quarkus #RedHat extension concept build steps + build items

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@holly_cummins @geoand86 #Quarkus #RedHat

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@holly_cummins @geoand86 #Quarkus #RedHat build steps

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@holly_cummins @geoand86 #Quarkus #RedHat

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@holly_cummins @geoand86 #Quarkus #RedHat build items

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@holly_cummins @geoand86 #Quarkus #RedHat

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@holly_cummins @geoand86 #Quarkus #RedHat framework automatically determines correct execution order and injects parameters

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@holly_cummins @geoand86 #Quarkus #RedHat build items are communication mechanism between build steps framework automatically determines correct execution order and injects parameters

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@holly_cummins @geoand86 #Quarkus #RedHat initial state build items intermediate state build items terminal state build items

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@holly_cummins @geoand86 #Quarkus #RedHat initial state build items JarResultBuildStep intermediate state build items terminal state build items

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@holly_cummins @geoand86 #Quarkus #RedHat initial state build items JarResultBuildStep GeneratedResourceBuildItem intermediate state build items terminal state build items

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@holly_cummins @geoand86 #Quarkus #RedHat initial state build items JarResultBuildStep GeneratedResourceBuildItem ConfigClassBuildItem intermediate state build items terminal state build items

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@holly_cummins @geoand86 #Quarkus #RedHat initial state build items JarResultBuildStep GeneratedResourceBuildItem ConfigClassBuildItem UnremovableBeanBuildItem intermediate state build items terminal state build items

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@holly_cummins @geoand86 #Quarkus #RedHat initial state build items JarResultBuildStep GeneratedResourceBuildItem ConfigClassBuildItem UnremovableBeanBuildItem BuildSystemTargetBuildItem intermediate state build items terminal state build items

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@holly_cummins @geoand86 #Quarkus #RedHat initial state build items JarResultBuildStep GeneratedResourceBuildItem ConfigClassBuildItem UnremovableBeanBuildItem BuildSystemTargetBuildItem LaunchModeBuildItem intermediate state build items terminal state build items

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@holly_cummins @geoand86 #Quarkus #RedHat initial state build items JarResultBuildStep GeneratedResourceBuildItem ConfigClassBuildItem UnremovableBeanBuildItem BuildSystemTargetBuildItem LaunchModeBuildItem most extensions do stuff here intermediate state build items terminal state build items

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@holly_cummins @geoand86 #Quarkus #RedHat what kind of things can build items do? Create a servlet Create a route Pull an external bean into the closed world Turn one annotation into another Add a log handler Read an extra application archive Flag a capability as present Interact with Kubernetes …

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@holly_cummins @geoand86 #Quarkus #RedHat existing build items cover almost all needs like a library for extension writers

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@holly_cummins @geoand86 #Quarkus #RedHat

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@holly_cummins @geoand86 #Quarkus #RedHat extension concept index

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@holly_cummins @geoand86 #Quarkus #RedHat extension concept index

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@holly_cummins @geoand86 #Quarkus #RedHat extension concept index eliminates need for runtime classpath scanning

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@holly_cummins @geoand86 #Quarkus #RedHat extension concept index “jandex” eliminates need for runtime classpath scanning

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@holly_cummins @geoand86 #Quarkus #RedHat open world closed world

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@holly_cummins @geoand86 #Quarkus #RedHat open world closed world hard to build-time optimise

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@holly_cummins @geoand86 #Quarkus #RedHat open world closed world hard to build-time optimise easy to build-time optimise

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@holly_cummins @geoand86 #Quarkus #RedHat open world closed world hard to build-time optimise easy to build-time optimise runtime class surprise!

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@holly_cummins @geoand86 #Quarkus #RedHat open world closed world hard to build-time optimise easy to build-time optimise runtime class surprise!

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@holly_cummins @geoand86 #Quarkus #RedHat open world closed world hard to build-time optimise easy to build-time optimise no worries runtime class surprise!

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@holly_cummins @geoand86 #Quarkus #RedHat open world closed world hard to build-time optimise easy to build-time optimise no worries runtime class surprise!

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@holly_cummins @geoand86 #Quarkus #RedHat open world closed world hard to build-time optimise easy to build-time optimise uh oh, this is outside our closed world no worries runtime class surprise!

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@holly_cummins @geoand86 #Quarkus #RedHat AdditionalBeanBuildItem

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@holly_cummins @geoand86 #Quarkus #RedHat AdditionalBeanBuildItem

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@holly_cummins @geoand86 #Quarkus #RedHat extension concept bytecode recording easier than writing ASM (if recording isn’t optimised enough, use Gizmo to hand-craft bytecode)

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Example @Recorder public class CaffeineCacheBuildRecorder { // a proxy of this is invoked at build time // the “real” invocation happens at runtime with the CaffeineCacheInfo obtained at build time public Supplier getCacheManagerSupplier(Set cacheInfos) { return new Supplier() { @Override public CacheManager get() { if (cacheInfos.isEmpty()) { return new CacheManagerImpl(Collections.emptyMap()); } else { Map caches = new HashMap<>(cacheInfos.size() + 1, 1.0F); for (CaffeineCacheInfo cacheInfo : cacheInfos) { CaffeineCache cache = new CaffeineCache(cacheInfo); caches.put(cacheInfo.name, cache); } return new CacheManagerImpl(caches); } } }; } }

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@holly_cummins @geoand86 #Quarkus #RedHat extension concept configuration

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime extension

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime extension deployment

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime extension deployment runtime

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime extension deployment runtime config config

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime extension deployment runtime config config config config

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@holly_cummins @geoand86 #Quarkus #RedHat Quarkus deployment runtime extension deployment runtime config config config config

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@holly_cummins @geoand86 #Quarkus #RedHat demo

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@holly_cummins @geoand86 #Quarkus #RedHat demo: recap

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@holly_cummins @geoand86 #Quarkus #RedHat https://github.com/holly-cummins/quarkus-minecraft-observability-extension

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@holly_cummins @geoand86 #Quarkus #RedHat

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@holly_cummins @geoand86 #Quarkus #RedHat

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@holly_cummins @geoand86 #Quarkus #RedHat

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@holly_cummins @geoand86 #Quarkus #RedHat https://github.com/holly-cummins/ quarkus-minecraft-observability-extension

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@holly_cummins @geoand86 #Quarkus #RedHat extension concept GraalVM ● Contribute GraalVM configuration ○ Reflection registration ○ Dynamic proxy registration ○ Resource files ○ Message bundles ○ Etc.   ● Provide substitutions ○ Pieces of code that are used in place of regular library code when in native mode

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Substitutions @TargetClass(org.infinispan.client.hotrod.impl.RemoteCacheImpl.class) public final class SubstituteRemoteCacheImpl { @Delete private ObjectName mbeanObjectName; @Substitute private void registerMBean(ObjectName jmxParent) { } @Substitute private void unregisterMBean() { } @Delete public void init(OperationsFactory operationsFactory, Configuration configuration, ObjectName jmxParent) { } }

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Real world examples ● Jackson extension   ● Hibernate Validator extension   ● Spring DI extension     Resources ● http:/ /quarkus.io ● https:/ /quarkus.io/guides/all-builditems ● https:/ /quarkus.io/blog/quarkus-aws-cloudwatch_extension/ ● https:/ /quarkus.io/blog/solving-problems-with-custom-extensions/

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® thank you @holly_cummins @geoand86 https://github.com/holly- cummins/quarkus-minecraft- observability-extension code