A Groovy Kind of Java (San Francisco Java User Group)

A Groovy Kind of Java
The Groovy Way to Manage Apps in the Cloud

@natishalom

THE GOOD OLD APPLICATION PACKAGE

GOOD AS LONG AS…

 You assume the other components
are managed (DB, LB, …)
 Everything in your app is Java-based
 Servers are statically deployed

THINGS HAVE CHANGED

• The world is heterogeneous
• Cloud - The new data center
• Tons of OSS projects
• Speed of change ->
continuous delivery
• Reduced Boundaries
between Dev and Ops

THE NEW APPLICATION STACK

Distributed
Dependencies
Application

Pod DB
Tomcat, Node.js, Ruby,
NoSQL

Web
LB
Server

Packaging is just not enough...

What about the operational aspect?

Deployment Post Deployment

Installation Fail-over

Dependency Configuration Update /
Maintenance

Monitoring
Startup

…AND ALL THAT
NEEDS TO REMAIN
CONSISTENT ACROSS
THE STACK

We need a new way to describe and
deploy these apps...

A DSL TO THE RESCUE

11 ® Copyright 2012 GigaSpaces Ltd. All Rights Reserved

RECIPES – THE NEW APPLICATION DEPLOYMENT DSL
Recipes define all the details needed to run an app:
 What middleware services to run
 Dependencies between services
 How to install services
 Where application and service binaries are
 When to spawn or terminate instances
 How to monitor each of the services.


THE RUBY WAY...


HOW CAN I DO THE SAME THING IN JAVA?


GROOVY – GREAT FOR JAVA BASED DSL

Removes
Syntactical
Noise



Extendable



Readable


CREATING A GROOVY-BASED APPLICATION
RECIPE DSL – THE CLOUDIFY WAY


CLOUDIFY RECIPE DOMAIN MODEL
Application:
Describes the
application tiers and
their dependencies Application

Pod DB
Service:
Describe an individual tier
e.g. Tomcat, Node.js, Ruby, NoSQL

Web
LB
Server

APPLICATION RECIPE

application {
name="petclinic"
service {
name = "mongod"
}
service {
name = "mongoConfig"
}
service {
name = "apacheLB"
}
service {
name = "mongos"
dependsOn = ["mongoConfig", "mongod"]
}
}

® Copyright 2012 GigaSpaces Ltd. All Rights Reserved

SERVICE RECIPE: MACHINE TEMPLATES
service {
name "mysql"
icon "mysql.png"
type "DATABASE"
...
}

lifecycle{
install "mysql_install.groovy"
start "mysql_start.groovy"
startDetectionTimeoutSecs 900
startDetection "mysql_startDetection.groovy"
stopDetection {
!ServiceUtils.isPortOccupied(jdbcPort)
}
preStop ([
"Win.*":"killAllMysql.bat",
"Linux.*":"mysql_stop.groovy"
21])
shutdown ([
"Linux.*":"mysql_uninstall.groovy"
])


SERVICE RECIPE: SCALING RULES

scalingRules ([
scalingRule {
serviceStatistics {
metric "Total Requests Count"
statistics
Statistics.maximumThroughput
movingTimeRangeInSeconds 20
}
highThreshold {
value 1
instancesIncrease 1
}
lowThreshold {
value 0.2
instancesDecrease 1
}
}
22])


SERVICE RECIPE: CUSTOM METRICS
monitors {

def ctxPath = ("default" ==
context.applicationName)?"":"${context.applicationName}“

def metricNamesToMBeansNames = [
"Current Http Threads Busy": ["Catalina:type=ThreadPool,name="http-bio-
${currHttpPort}"", "currentThreadsBusy"],
"Current Http Thread Count": ["Catalina:type=ThreadPool,name="http-bio-
${currHttpPort}"", "currentThreadCount"],

return getJmxMetrics("127.0.0.1",currJmxPort,metricNamesToMBeansNames)
}


SERVICE RECIPE: MACHINE TEMPLATES

compute {
template "SMALL_LINUX"
}

SMALL_LINUX : template{ SMALL_LINUX : template
imageId "1234" imageId "us-east-1/ami-76f0061f“
machineMemoryMB 3200 remoteDirectory "/home/ec2-user/gs-files“
hardwareId "103" machineMemoryMB 1600
remoteDirectory "/root/gs-files" hardwareId "m1.small"
localDirectory "upload" locationId "us-east-1"
keyFile "gigaPGHP.pem" localDirectory "upload"
options ([ keyFile "myKeyFile.pem"
"openstack.securityGroup" : "default",
"openstack.keyPair" : "gigaPGHP" options ([
]) "securityGroups" : ["default"]as
privileged true String[],
} "keyPair" : "myKeyFile"
])
overrides (["jclouds.ec2.ami-query":"",
"jclouds.ec2.cc-ami-query":""])
privileged true
}


INTEGRATING WITH CHEF
service {
extend "../../../services/chef"
name "your service name"
Extending the Chef Recipe
type "DATABASE"
numInstances 1

compute { Custom Service Name
template "SMALL_UBUNTU"
}
lifecycle {
startDetectionTimeoutSecs 240 Add Custom Start Detector
startDetection {

ServiceUtils.isPortOccupied(System.getenv()["CLOUDIFY_AGENT_ENV_PRIVATE
_IP"], 3306)
}
}

}
runParams = [
“param1": “value1”,
“param2": [“key1”:”subvalue1”,…]
Runtime parameters
…
"run_list": ["recipe[cookbook_name::recipe_name]"]
]

Run list
(Recipes or Roles)

UNDER THE HOOD...


LET’S START WITH A BASIC GROOVY FILE


USE CONSTRUCTOR WITH NAMED PARAMETERS


ADD IMPORT CUSTOMIZER TO GROOVY SHELL


BETTER, BUT NEEDS A BIT MORE


OVERRIDE SCRIPT BASE CLASS

 A Groovy script is compiled into a Java class.
 The Groovy commands runs in the run() method.
 The created Groovy class extends the groovy.lang.Script class.
 Default implementations of:
 get/setProperty
 invokeMethod
 println
 Use GroovyShell to replace default base script class with our
own implementation.


OVERRIDE SCRIPT BASE CLASS

 Tweak a few small things, like redirecting println() to Logger


AND TWEAK SOME MORE

 Override invokeMethod() and setProperty()
 Map method names to domain objects
 If not a domain object, map to field name of current object


LOAD AN OPTIONAL PROPERTIES FILE AND BIND TO SHELL

 Bind to Groovy Shell


EASY TO READ, BUT STILL POWERFUL


EXTENSIVE PLATFORM SUPPORT


Get it today
http://www.cloudifysource.org
http://github.com/CloudifySource/cloudify

A Groovy Kind of Java (San Francisco Java User Group)

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