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decide to
write
extension
write
extension
share
extension
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decide to
write
extension
write
extension
share
extension
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why?
(in general)
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reminder:
what makes quarkus special
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@holly_cummins
Java dynamism
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@holly_cummins
Java dynamism
build time
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@holly_cummins
Java dynamism
build time runtime
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@holly_cummins
Java dynamism
build time runtime
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@holly_cummins
Java dynamism
packaging
(maven, gradle…)
build time runtime
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@holly_cummins
Java dynamism
build time runtime
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@holly_cummins
Java dynamism
build time runtime
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@holly_cummins
Java dynamism
>
build time runtime
load and parse
• config files
• properties
• yaml
• xml
• etc.
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@holly_cummins
Java dynamism
>
build time runtime
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@holly_cummins
Java dynamism
@
@
>
build time runtime
• classpath scanning and
annotation discovery
• attempt to load class to
enable/disable features
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@holly_cummins
Java dynamism
@
@
>
build time runtime
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@holly_cummins
Java dynamism
@
@
>
build time runtime
build a metamodel
of the world
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@holly_cummins
Java dynamism
@
@
>
build time runtime
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@holly_cummins
Java dynamism
@
@
>
build time runtime
start
• thread pools
• I/O
• etc.
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@holly_cummins
Java dynamism
@
@
>
build time runtime
ready to
do work!
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@holly_cummins
what if we start the application more than once?
@
@
>
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@holly_cummins
what if we start the application more than once?
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>
@
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>
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@holly_cummins
what if we start the application more than once?
@
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>
@
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>
@
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>
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@holly_cummins
what if we start the application more than once?
@
@
>
@
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>
@
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>
@
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>
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@holly_cummins
what if we start the application more than once?
@
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>
@
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@
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@holly_cummins
what if we start the application more than once?
@
@
>
@
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>
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so much work gets
redone every time
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@holly_cummins
how do we fix all this?
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@holly_cummins
@
@
>
build time runtime
what if we initialize at build time?
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@holly_cummins
@
@
>
build time runtime
what if we initialize at build time?
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@holly_cummins
@
@
>
build time runtime
start
• thread pools
• I/O
• etc.
what if we initialize at build time?
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@holly_cummins
@
@
>
build time runtime
ready to
do work!
start
• thread pools
• I/O
• etc.
what if we initialize at build time?
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@holly_cummins
@
@
>
repeated starts are now efficient
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@holly_cummins
@
@
>
repeated starts are now efficient
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@holly_cummins
@
@
>
repeated starts are now efficient
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@holly_cummins
@
@
>
repeated starts are now efficient
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@holly_cummins
@
@
>
repeated starts are now efficient
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@holly_cummins
@
@
>
repeated starts are now efficient
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@holly_cummins
@
@
>
repeated starts are now efficient
less wasted work
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@holly_cummins
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@holly_cummins
doing more up-front
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@holly_cummins
doing more up-front
- speeds up start
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@holly_cummins
doing more up-front
- speeds up start
- shrinks memory footprint
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@holly_cummins
doing more up-front
- speeds up start
- shrinks memory footprint
- improves throughput (!)
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@holly_cummins
but what about other libraries?
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@holly_cummins
but what about other libraries?
@
@
>
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@holly_cummins
but what about other libraries?
@
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>
@
@
>
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@holly_cummins
but what about other libraries?
@
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>
@
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>
@
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>
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@holly_cummins
but what about other libraries?
@
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>
@
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>
@
@
>
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@holly_cummins
the quarkus build process is extensible
what extensions do is participate in the build process
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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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No content
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dynamic-but-static
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dynamic-but-static
“wouldn’t it be nice if …
… but it’s too expensive to do it at runtime.”
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why?
(for you)
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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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how?
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decide to
write
extension
write
extension
share
extension
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extension concept
deployment
+
runtime
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extension concept
build phase
+
startup phase
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Quarkus
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Quarkus
deployment
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Quarkus
deployment runtime
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Quarkus
deployment runtime
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Quarkus
deployment runtime
bytecode
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Quarkus
deployment runtime
bytecode
extension
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Quarkus
deployment runtime
bytecode
extension
deployment
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Quarkus
deployment runtime
bytecode
extension
deployment runtime
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Quarkus
deployment runtime
bytecode
extension
deployment runtime
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Quarkus
deployment runtime
bytecode
extension
deployment runtime
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Quarkus
deployment runtime
bytecode
extension
deployment runtime
bytecode
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extension concept
build steps
+
build items
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build steps
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build items
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framework automatically
determines correct execution
order and injects parameters
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build items are communication
mechanism between build steps
framework automatically
determines correct execution
order and injects parameters
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initial state build items intermediate state build items terminal state build items
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initial state build items
JarResultBuildStep
intermediate state build items terminal state build items
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initial state build items
JarResultBuildStep
GeneratedResourceBuildItem
intermediate state build items terminal state build items
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initial state build items
JarResultBuildStep
GeneratedResourceBuildItem
ConfigClassBuildItem
intermediate state build items terminal state build items
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initial state build items
JarResultBuildStep
GeneratedResourceBuildItem
ConfigClassBuildItem
UnremovableBeanBuildItem
intermediate state build items terminal state build items
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initial state build items
JarResultBuildStep
GeneratedResourceBuildItem
ConfigClassBuildItem
UnremovableBeanBuildItem
BuildSystemTargetBuildItem
intermediate state build items terminal state build items
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initial state build items
JarResultBuildStep
GeneratedResourceBuildItem
ConfigClassBuildItem
UnremovableBeanBuildItem
BuildSystemTargetBuildItem
LaunchModeBuildItem
intermediate state build items terminal state build items
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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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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
Communicate between extensions!
…
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existing build items
cover almost all needs
like a library for extension writers
but you can write your own too
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No content
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works in dev mode
works in JVM
works in native mode
con
fi
guration
provides a dev service
supersonic performance
joyful programming model
dev UI
codestart template
maturity
model for
quarkus
extensions
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works in dev mode
works in JVM
works in native mode
con
fi
guration
provides a dev service
supersonic performance
joyful programming model
dev UI
codestart template
maturity
model for
quarkus
extensions
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@holly_cummins
the Quarkus way enables native compilation
native
(graalvm)
@
@
>
jvm
build time
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@holly_cummins
the Quarkus way enables native compilation
native
(graalvm)
@
@
>
jvm
build time
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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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works in dev mode
works in JVM
works in native mode
con
fi
guration
provides a dev service
supersonic performance
joyful programming model
dev UI
codestart template
maturity
model for
quarkus
extensions
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works in dev mode
works in JVM
works in native mode
con
fi
guration
provides a dev service
supersonic performance
joyful programming model
dev UI
codestart template
examples:
configuration
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Quarkus
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Quarkus
deployment
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Quarkus
deployment runtime
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Quarkus
deployment runtime
extension
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Quarkus
deployment runtime
extension
deployment
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Quarkus
deployment runtime
extension
deployment runtime
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Quarkus
deployment runtime
extension
deployment runtime
config
config
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Quarkus
deployment runtime
extension
deployment runtime
config
config
config
config
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Quarkus
deployment runtime
extension
deployment runtime
config
config
config
config
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demo
https://github.com/holly-cummins/quarkus-minecraft-observability-extension
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works in dev mode
works in JVM
works in native mode
con
fi
guration
provides a dev service
supersonic performance
joyful programming model
dev UI
codestart template
examples:
dev service
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demo
https://github.com/holly-cummins/quarkus-minecraft-observability-extension
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works in dev mode
works in JVM
works in native mode
con
fi
guration
provides a dev service
supersonic performance
joyful programming model
dev UI
codestart template
examples:
dev ui
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Uses JBoss log consumer which pipes output from dev container to a tab in the dev service
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works in dev mode
works in JVM
works in native mode
con
fi
guration
provides a dev service
supersonic performance
joyful programming model
dev UI
codestart template
examples:
joyful
programming
model
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extension concept
index
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extension concept
index
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extension concept
index
“offline-reflection”
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extension concept
index
jandex
“offline-reflection”
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extension concept
index
jandex
“offline-reflection”
eliminates need for runtime classpath scanning
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open world closed world
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open world closed world
hard to build-time optimise
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open world closed world
hard to build-time optimise easy to build-time optimise
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open world closed world
hard to build-time optimise easy to build-time optimise
runtime class surprise!
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open world closed world
hard to build-time optimise easy to build-time optimise
runtime class surprise!
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open world closed world
hard to build-time optimise easy to build-time optimise
no worries
runtime class surprise!
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open world closed world
hard to build-time optimise easy to build-time optimise
no worries
runtime class surprise!
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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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AdditionalBeanBuildItem
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AdditionalBeanBuildItem
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extension concept
bytecode recording
easier than writing ASM
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extension concept
gizmo
when you don’t want to ASM…
… but bytecode recording isn’t enough
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persistence.xml
hibernate extension
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persistence.xml
hibernate extension
the hibernate extension makes this go away
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works in dev mode
works in JVM
works in native mode
con
fi
guration
provides a dev service
supersonic performance
joyful programming model
dev UI
codestart template
examples:
supersonic
subatomic
performance
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deployment
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understand app
deployment
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understand app
eliminate reflection
deployment
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understand app
eliminate reflection
convert annotations to bytecode
deployment
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understand app
eliminate reflection
convert annotations to bytecode
optimize
deployment
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@holly_cummins
Hibernate
speed example: JTA auto-wiring
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@holly_cummins
Hibernate
speed example: JTA auto-wiring
Class.forName(“LikelyJTAImplementation”);
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@holly_cummins
Hibernate
speed example: JTA auto-wiring
Class.forName(“LikelyJTAImplementation”);
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@holly_cummins
Hibernate
speed example: JTA auto-wiring
Class.forName(“LikelyJTAImplementation”);
Class.forName(“APossibleJTAImplementation”);
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@holly_cummins
Hibernate
speed example: JTA auto-wiring
Class.forName(“LikelyJTAImplementation”);
Class.forName(“APossibleJTAImplementation”);
Class.forName(“AnotherJTAImplementation”);
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@holly_cummins
Hibernate
speed example: JTA auto-wiring
Class.forName(“LikelyJTAImplementation”);
Class.forName(“APossibleJTAImplementation”);
Class.forName(“AnotherJTAImplementation”);
…
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@holly_cummins
Hibernate
speed example: JTA auto-wiring
Class.forName(“LikelyJTAImplementation”);
Class.forName(“APossibleJTAImplementation”);
Class.forName(“AnotherJTAImplementation”);
Class.forName(“NicheJTAImplementation”);
…
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@holly_cummins
Hibernate
speed example: JTA auto-wiring
Class.forName(“LikelyJTAImplementation”);
Class.forName(“APossibleJTAImplementation”);
Class.forName(“AnotherJTAImplementation”);
Class.forName(“NicheJTAImplementation”);
Class.forName(“VeryNicheJTAImplementation”);
…
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@holly_cummins
Hibernate
speed example: JTA auto-wiring
Class.forName(“LikelyJTAImplementation”);
Class.forName(“APossibleJTAImplementation”);
Class.forName(“AnotherJTAImplementation”);
Class.forName(“NicheJTAImplementation”);
Class.forName(“VeryNicheJTAImplementation”);
…
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@holly_cummins
Hibernate
speed example: JTA auto-wiring
Class.forName(“LikelyJTAImplementation”);
Class.forName(“APossibleJTAImplementation”);
Class.forName(“AnotherJTAImplementation”);
Class.forName(“NicheJTAImplementation”);
Class.forName(“VeryNicheJTAImplementation”);
…
~129
auto-wiring attempts
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@holly_cummins
Hibernate
speed example: JTA auto-wiring
Class.forName(“LikelyJTAImplementation”);
Class.forName(“APossibleJTAImplementation”);
Class.forName(“AnotherJTAImplementation”);
Class.forName(“NicheJTAImplementation”);
Class.forName(“VeryNicheJTAImplementation”);
…
~129
auto-wiring attempts
every single start.
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@holly_cummins
it’s not just JTA
this happens for lots of internal service bindings
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@holly_cummins
JVM
footprint example: Hibernate
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@holly_cummins
JVM spends time
loading classes for
specific databases
JVM
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
footprint example: Hibernate
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@holly_cummins
JVM spends time
loading classes for
specific databases
JVM
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
class for
unused
database
turns out they’re
never used
footprint example: Hibernate
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@holly_cummins
JVM spends time
loading classes for
specific databases
JVM
turns out they’re
never used
JIT spends time
unloading classes
footprint example: Hibernate
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@holly_cummins
Hibernate
example:
~500 classes
which are only useful if you're running an Oracle database
loaded and then unloaded
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@holly_cummins
Hibernate
example:
~500 classes
which are only useful if you're running an Oracle database
loaded and then unloaded
every single start.
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@holly_cummins
the true cost of loaded classes isn’t just memory + start time
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@holly_cummins
the true cost of loaded classes isn’t just memory + start time
method dispatching:
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@holly_cummins
interface
the true cost of loaded classes isn’t just memory + start time
method dispatching:
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@holly_cummins
unused
implementation
the one we
want
interface
unused
implementation
unused
implementation
the true cost of loaded classes isn’t just memory + start time
method dispatching:
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@holly_cummins
unused
implementation
the one we
want
interface
unused
implementation
unused
implementation
the true cost of loaded classes isn’t just memory + start time
method dispatching:
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@holly_cummins
unused
implementation
the one we
want
interface
megamorphic call
slow dispatching
unused
implementation
unused
implementation
the true cost of loaded classes isn’t just memory + start time
method dispatching:
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@holly_cummins
the true cost of loaded classes isn’t just memory + start time
the one we
want
interface
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@holly_cummins
the true cost of loaded classes isn’t just memory + start time
the one we
want
monomorphic call
fast dispatching
interface
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decide to
write
extension
write
extension
share
extension
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No content
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No content
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No content