1.
Monitoring and
Feature Toggle Pattern
with JMX
Bruno Bonfils
Cyrille Le Clerc 15/06/2011
Thursday, June 16, 2011

2.
Speaker
@cyrilleleclerc
blog.xebia.fr
Cyrille Le Clerc
Large Scale
In Memory Data Grid
Open Source
(Apache CXF, ...)
“you build it, you run it”
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Thursday, June 16, 2011

3.
The use case
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Thursday, June 16, 2011

4.
The Use Case
Corporate Data Center
travel-ecommerce
anti-fraud
Tomcat
Tomcat
travel-ecommerce anti-fraud
Tomcat Tomcat
Credit Card Service
Travel e-commerce application
4
Thursday, June 16, 2011

5.
The Use Case
 xebia-spring-travel source code
▶ http://xebia-france.googlecode.com/svn/training/xebia-spring-travel/tags/xebia-spring-travel-1.0.0/
▶ Groovy JMX scripts
» http://xebia-france.googlecode.com/svn/training/xebia-spring-travel/tags/xebia-spring-travel-1.0.0/xebia-spring-travel-
ecommerce/src/main/scripts/
▶ JMXTrans Configuration
» http://xebia-france.googlecode.com/svn/training/xebia-spring-travel/tags/xebia-spring-travel-1.0.0/xebia-spring-travel-
ecommerce/src/main/jmxtrans/
▶ JMeter plan
» http://xebia-france.googlecode.com/svn/training/xebia-spring-travel/tags/xebia-spring-travel-1.0.0/xebia-spring-travel-
ecommerce/src/main/jmeter/
 xebia-management-extras JMX library
▶ http://code.google.com/p/xebia-france/wiki/XebiaManagementExtras
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6.
Part 1
Monitoring with JMX
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Thursday, June 16, 2011

7.
Simplified Use Case
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8.
Simplified Use Case
Corporate Data Center
travel-ecommerce
Tomcat
Credit Card Service
Mock
Monitoring Booking and Credit Card Service
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Thursday, June 16, 2011

9.
Simplified Use Case
Corporate Data Center
travel-ecommerce
Tomcat
Credit Card Service
Mock
Monitoring Booking and Credit Card Service
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Thursday, June 16, 2011

10.
Custom/business indicator monitoring
with JMX
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11.
Custom Indicator Monitoring with JMX
CreditCardService
#purchase()
CreditCardService MonitoringImpl CreditCardServiceImpl
#purchase() #purchase()
monitoring logic isolated with a delegate pattern
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12.
Custom Indicator Monitoring with JMX
@ManagedResource
public class CreditCardServiceMonitoringImpl implements CreditCardService {
// delegate
private CreditCardService creditCardService;
// counters
private final AtomicInteger purchaseInvocationCounter = new AtomicInteger();
private final AtomicLong purchaseInvocationDurationInNanosCounter = new AtomicLong();
private final AtomicInteger threeDSecureVerificationExceptionCounter = new AtomicInteger();
@Override
public PaymentTransaction purchase(MonetaryAmount total, Order order, String requestId) {
long nanosBefore = System.nanoTime();
try {
return creditCardService.purchase(total, order, requestId);
} catch (ThreeDSecureVerificationException e) {
threeDSecureVerificationExceptionCounter.incrementAndGet();
throw e;
} finally {
purchaseInvocationCounter.incrementAndGet();
purchaseInvocationDurationInNanosCounter.addAndGet(System.nanoTime() - nanosBefore);
}
}
http://code.google.com/p/xebia-france/source/browse/training/xebia-spring-travel/tags/xebia-spring-travel-1.0.0/xebia-spring-travel-ecommerce/src/main/java/fr/
xebia/monitoring/demo/payment/CreditCardServiceMonitoringImpl.java
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13.
Accessing JMX is not so difficult
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14.
JMX Monitoring with Visual VM
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15.
JMX Monitoring with JSP Pages
Powered by JMX !
 Human friendly or script friendly pages
 Beware of security
▶ BasicAuth
▶ Obfuscated URL : /my-app/seye5E7E/jmx/cxf.jsp
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16.
Graphite - JMXTrans Style Reporting Tools
{
"servers" : [ {
"port" : "6969",
"host" : "my-server-1",
"alias" : "travel-ecommerce-1",
"queries" : [
{
"outputWriters" : [ {
"@class" : "com.googlecode.jmxtrans.model.output.GraphiteWriter",
"settings" : { "port" : 2003, "host" : "graphite-server" }
}],
"obj": "travel-ecommerce:name=CreditCardServiceMonitoringImpl,...",
Graphite
"resultAlias" : "CreditCardService",
"attr":["PurchaseInvocationCount", "ThreeDSecureVerificationExceptionCount", ...]
}
],
"numQueryThreads" : 2
JMX Trans Configuration
} ]
}
http://code.google.com/p/xebia-france/source/browse/training/xebia-spring-travel/tags/xebia-spring-travel-1.0.0/xebia-spring-travel-
ecommerce/src/main/jmxtrans/xebia-spring-travel-ecommerce-jmxtrans.json 16
Thursday, June 16, 2011

17.
Monotoring systems
AppDynamics
Hyperic
All others ...
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18.
JVM Based Scripting Language
http://code.google.com/p/xebia-france/source/browse/training/xebia-spring-travel/tags/xebia-spring-
travel-1.0.0/xebia-spring-travel-ecommerce/src/main/scripts/getAntiFraudVerificationStatus.groovy
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19.
Part 2
Feature Toggle Pattern with JMX
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20.
Simplified Use Case
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21.
Simplified Use Case
Corporate Data Center
travel-ecommerce
anti-fraud
Tomcat
Tomcat
Credit Card Service
Enable anti-fraud
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22.
What ? Why ?
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23.
What is it ?
 Technique to enable/disable a feature without
redeploying
 Can be simple : on/off
 Can be sophisticated : f(user), f(server), etc
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24.
Benefits of the Feature Toggle Pattern
 Dissociate deployment & feature activation
 Progressive activation of a feature
Canary Testing
 Measure impacts of a new version
A/B Testing
 Differ feature activation on production
 Trunk based development
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25.
Coding Patterns
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26.
Coding Patterns
Dispatcher
AntiFraudService
<<Interface>>
AntiFraudServiceV1Impl
AntiFraudService
DispatchingImpl
AntiFraudServiceV2Impl
JMX
transient persistent
The dispatcher holds the feature toggle
http://code.google.com/p/xebia-france/source/browse/training/xebia-spring-travel/tags/xebia-spring-
travel-1.0.0/xebia-spring-travel-ecommerce/src/main/java/fr/xebia/ws/travel/antifraud/v1_0/
AntiFraudServiceDispatchingImpl.java 26
Thursday, June 16, 2011

27.
Coding Patterns
To duplicate or not to duplicate ?
Dispatching
Smart reuse and mutualization
Dispatching
Brutal duplication
Version 1
Version 2
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Thursday, June 16, 2011

28.
Coding Patterns
To duplicate or not to duplicate ?
Dispatching
Smart reuse and mutualization
Dispatching
Brutal duplication
Version 1
Version 2
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Thursday, June 16, 2011

29.
Coding Patterns
To duplicate or not to duplicate ?
Dispatching
Smart reuse and mutualization
Dispatching
Brutal duplication
Version 1
Version 2
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Thursday, June 16, 2011

30.
Coding Patterns
To duplicate or not to duplicate ?
Old version removal requires cleanup
Smart reuse and mutualization
Old version removal is clean
Brutal duplication
Version 1
Version 2
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Thursday, June 16, 2011

31.
Coding Patterns
To duplicate or not to duplicate ?
Old code removal is simpler with brutal duplication
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32.
Demo
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33.
Questions / Answers
?
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