Downloaded 36 times
![JeAy
Launcher
public class Launcher {
public static void main(String[] args) {
Server server = new Server();
SelectChannelConnector connector
= new SelectChannelConnector();
connector.setPort(8080);
server.addConnector(connector);
WebAppContext context = new WebAppContext("war", "/");
server.setHandler(context);
server.start();
}
}
Saturday, April 21, 12](https://image.slidesharecdn.com/javaonemoscow2012-noredeploys-120421115246-phpapp01/75/NoRedeploys-instant-updates-for-dev-and-prod-8-2048.jpg)
Uploaded byAnton Arhipov
NoRedeploys: instant updates for dev and prod
The document discusses techniques for improving the development workflow by enabling instant updates to code in development and production environments without redeploys. It compares traditional redeploys that require building, deploying, and waiting to reload changes versus using tools like JRebel that can hotswap code changes instantly. JRebel works by keeping the original and modified class files and swapping between them to instantly apply changes to running applications.
NoRedeploys: instant updates for dev and prod
- 1. NoRedeploys Instant updates for dev and prod Anton Arhipov Product Lead, JRebel @antonarhipov @javarebel Saturday, April 21, 12
- 2.
- 3. Turnaround cycle Make a change Check Build, the deploy, result wait Saturday, April 21, 12
- 4. Build Resolve dependencies Copy staGc resources Compile classes Package modules into JARs Package everything into WAR/EAR Saturday, April 21, 12
- 5. Build Resolve dependencies Copy staGc resources Compile classes Package modules into JARs Package everything into WAR/EAR Saturday, April 21, 12
- 6. Exploded Directory Deployment Saturday,April 21, 12
- 7. Exploded Directory Deployment Saturday,April 21, 12
- 8. JeAy Launcher public class Launcher { public static void main(String[] args) { Server server = new Server(); SelectChannelConnector connector = new SelectChannelConnector(); connector.setPort(8080); server.addConnector(connector); WebAppContext context = new WebAppContext("war", "/"); server.setHandler(context); server.start(); } } Saturday, April 21, 12
- 9. Deployment 1–60s 30s – 15min ~1min applicaBon deployment container boot Bme navigaBon Saturday, April 21, 12
- 10. Deployment 1–60s 30s – 15min ~1min OOM applicaBon deployment container boot Bme navigaBon Saturday, April 21, 12
- 11. OutOfMemoryError DEMO Saturday, April 21, 12
- 12. Externalized, Temporary, State% Serializable, Deriva6ve, Saturday, April 21, 12
- 13. Reloading Classes OldClassLoader MyObject.class MyObject Saturday, April 21, 12
- 14. Reloading Classes OldClassLoader NewClassLoader MyObject.class MyObject Saturday, April 21, 12
- 15. Reloading Classes OldClassLoader NewClassLoader MyObject.class MyObject.class Recreate object MyObject MyObject Saturday, April 21, 12
- 16. Web ApplicaBon Redeployment Process Session Classes Servlet State Libraries OldClassLoader Saturday, April 21, 12
- 17. Web ApplicaBon Redeployment Process Session Classes Servlet State Libraries OldClassLoader NewClassLoader Saturday, April 21, 12
- 18. Web ApplicaBon Redeployment Process Session Classes Servlet Classes State Libraries Libraries OldClassLoader NewClassLoader Saturday, April 21, 12
- 19. Web ApplicaBon Redeployment Process Session Classes Servlet Classes Servlet State Libraries Libraries OldClassLoader NewClassLoader Saturday, April 21, 12
- 20. Web ApplicaBon Redeployment Process init() Session Classes Servlet Classes Servlet State State Libraries Libraries OldClassLoader NewClassLoader Saturday, April 21, 12
- 21. Web ApplicaBon Redeployment Process Serialize/deserialize Session Session Classes Servlet Classes Servlet State State Libraries Libraries OldClassLoader NewClassLoader Saturday, April 21, 12
- 22. Web ApplicaBon Redeployment Process Session Session Classes Servlet Classes Servlet State State Libraries Libraries OldClassLoader NewClassLoader Saturday, April 21, 12
- 23. Web ApplicaBon Redeployment Process Session Classes Servlet State Libraries NewClassLoader Saturday, April 21, 12
- 24. Web ApplicaBon Redeployment Process Session Session Classes Servlet Classes Servlet State State Libraries Libraries OldClassLoader NewClassLoader Saturday, April 21, 12
- 25. OutOfMemoryError Simulation Saturday, April 21, 12
- 26.
- 27. HotSwap Make changes in IDE ClassLoader MyObject.class Code 101000101 HotSwap 100010010 New code 111000100 101010010 MyObject Saturday, April 21, 12
- 28. JRebel Make changes in IDE ClassLoader MyObject.class Code 101000101 New code JRebel 100010010 111000100 101010010 MyObject Saturday, April 21, 12
- 29. Hotswap vs JRebel JRebel&vs&HotSwap& Hotswap HotSwap( JRebel JRebel( Changing&method&bodies& +( +( Adding/removing&methods& ;& +& Adding/removing&constructors& ;& +& Adding/removing&fields& ;& +& Adding/removing&classes& ;& +& Adding/removing&annota?ons& ;& +& Replacing&superclass& ;& ;& Adding/removing&implemented& ;& ;& interfaces& Saturday, April 21, 12
- 30. JRebel Make changes in IDE ClassLoader MyObject.class Code 101000101 New code JRebel 100010010 111000100 101010010 MyObject Saturday, April 21, 12
- 31. JRebel Make changes in IDE ClassLoader Framework MyObject.class Code 101000101 New code JRebel 100010010 111000100 101010010 MyObject Saturday, April 21, 12
- 32. JRebel Make changes in IDE ClassLoader Framework MyObject.class Code 101000101 New code JRebel 100010010 111000100 101010010 MyObject ConfiguraGon (XML, annotaGons,..) Saturday, April 21, 12
- 33. getResource(“hello.html”) read(“src/main/.../hello.html”) virtual mapping MyApp.war Saturday, April 21, 12
- 34. in acBon Saturday, April21, 12
- 35. JRebel IntegraBon hAp://zeroturnaround.com/jrebel/features/frameworks/ Saturday, April 21, 12
- 36. What About Live Environments? Saturday, April 21, 12
- 37.
- 38.
- 39. • LiveRebel updates are – Online – Automated – TransacBonal – 100% Reversible – Instant Saturday, April 21, 12
- 40. ? 32 Saturday, April 21, 12