Migrating to Openshift - Reyhan Fabianto
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This document discusses migrating applications to Openshift. It recommends deploying up to 3 instances of routers and describes how sessions are handled between routers and browsers. It also discusses performance, scalability and availability considerations when migrating 128 applications. It provides code examples for using a SessionFilter and Java agent to integrate Redis session storage. The Java agent uses bytecode manipulation to add Redis functionality to applications at runtime.
![public class Hello {
public void run(String message) {
System.out.println("Hello " + message);
}
public class Hello {
public void run(String message) {
System.out.println("Hello " + message);
}
}
public static void main(String[] args) {
Hello hello = new Hello();
hello.run(args[0]);
}](https://image.slidesharecdn.com/cicd-180504074618/85/Migrating-to-Openshift-Reyhan-Fabianto-17-320.jpg)
![ClassPool cp = ClassPool.getDefault();
cp.importPackage(“redis.clients.jedis.Jedis");
CtClass cc = cp.get("other.Hello");
cc.addField(CtField.make("Jedis jedis = new Jedis();", cc));
CtMethod cm = cc.getDeclaredMethod("run");
cm.insertAfter("jedis.set(message, message + ” saved in Redis”);");
byte[] byteCode = cc.toBytecode();
cc.detach();
ClassPool cp = ClassPool.getDefault();
cp.importPackage(“redis.clients.jedis.Jedis");
CtClass cc = cp.get("other.Hello");
cc.addField(CtField.make("Jedis jedis = new Jedis();", cc));
CtMethod cm = cc.getDeclaredMethod("run");
cm.insertAfter("jedis.set(message, message + ” saved in Redis”);");
byte[] byteCode = cc.toBytecode();
cc.detach();
return byteCode;](https://image.slidesharecdn.com/cicd-180504074618/85/Migrating-to-Openshift-Reyhan-Fabianto-18-320.jpg)
Migrating to Openshift - Reyhan Fabianto
- 1. Migrating to Openshift Our Challenge
- 5. recommends only up to 3 instances
- 10. Filters public void doFilter(ServletRequest originalRequest, ServletResponse originalResponse, FilterChain chain) throws IOException, ServletException { // Insert code here }
- 13. Javaagent
- 17. public class Hello { public void run(String message) { System.out.println("Hello " + message); } public class Hello { public void run(String message) { System.out.println("Hello " + message); } } public static void main(String[] args) { Hello hello = new Hello(); hello.run(args[0]); }
- 18. ClassPool cp = ClassPool.getDefault(); cp.importPackage(“redis.clients.jedis.Jedis"); CtClass cc = cp.get("other.Hello"); cc.addField(CtField.make("Jedis jedis = new Jedis();", cc)); CtMethod cm = cc.getDeclaredMethod("run"); cm.insertAfter("jedis.set(message, message + ” saved in Redis”);"); byte[] byteCode = cc.toBytecode(); cc.detach(); ClassPool cp = ClassPool.getDefault(); cp.importPackage(“redis.clients.jedis.Jedis"); CtClass cc = cp.get("other.Hello"); cc.addField(CtField.make("Jedis jedis = new Jedis();", cc)); CtMethod cm = cc.getDeclaredMethod("run"); cm.insertAfter("jedis.set(message, message + ” saved in Redis”);"); byte[] byteCode = cc.toBytecode(); cc.detach(); return byteCode;
- 20. Thank you