Lucee Caching Strategies

Gert FranzRasia GmbH

WHO AM I?

• Gert Franz– Involved with Lucee and Railo since day 1

– Into CFML for 17 years

– DBA, System architect

– CFML Passionate

• Rasia is founding Member of theLucee Association

MY EVOLUTION

Assembler Basic Clipper Pascal Delphi Java CFML Lucee

WHO AM I?

• Studied Astrophysics in Munich

• Basic, dBase, Clipper, Visual Basic, Delphi, Java

• Performance, DB & Code Tuning is my professional Hobby

• I live in Switzerland

• Lucee training, consulting, support etc.

WHY?

• Many server side operations are time consuming– Database, function calls, CFCs, CFHTTP, web services– "It works on my machine" effect– Tons of traffic make it necessary

So clearly

Caching makes sense

CACHING UPS AND DOWNS

• Pro’s– Well yes, can’t really get faster than that

– Mostly depends on the storage mechanism

– Obviously RAM is the best location

CACHING UPS AND DOWNS

• Con’s

– Well the only downside is the topicality / relevanceof the data.

OK GOT IT, CFML HOW, WHAT?

• Your server is the clerk

• It waits for requests

• It checks places to retreive information

• It takes time to do so

SO HOW DOES THIS LOOK LIKE

CACHES DRIVERS

• Cache in Lucee is an interface what andwhere can I cache

• Drivers are how you can store the data cached

AVAILABLE CACHES

• PagePool

• Object

• Template

• Function

• Include

• HTTP

• Query

• Webservice

• File

• Other

AVAILABLE DRIVERS

• RAM

• EHCache

• EHCache Remote

• Mongo DB

• Redis

• Couchbase *

• Memcached

• Database

• Infinispan

PAGEPOOL CACHE

• Used whenever Lucee is supposed to execute a .cfm file

• Choose between never, once and always

• Data in cache can be listed (pagePoolList())

• Data can be cleared (pagePoolClear())

• Can not be used with a driver

PAGEPOOL CACHE

OBJECT CACHE

• Cache used with cacheGet() cachePut() etc.

• Is also used with the tag cfcache actionget/put

• Can be used with any driver

TEMPLATE CACHE

• Cache used with tag cfcache actions

– Content

– Cache

– serverCache

• Can be used with any driver

FUNCTION CACHE

• You can use the attribute cachedwithin forfunctions

• Deterministic functions can be cached

• Function will NOT be executed,

• return value will be returned and content will be generated

• Can be stored with any driver

FUNCTION CACHE EXAMPLE

struct function calcEnvironment(required string sUserAgent)

cachedWithin="0.1" {

some regexp stuff

some db stuff

return stEnv;

}

INCLUDE CACHE

• I guess we were smoking pot when wedesigned this

• Includes can be cached. Prevents executionand cached content will be rendered(functionality is IMHO incomplete)

• Can be stored with any driver

FUNCTION CACHE EXAMPLE

include "myFile.cfm" cachedWithin="0.1";

HTTP CACHE

• The implementation is quite useful sinceCFHTTP calls are very time consuming

• Just add the cachedwithin attribute to it

• It will cache the CFHTTP.fileContent

• Can be stored with any driver

FUNCTION CACHE EXAMPLE

http url="http://www.google.com" cachedWithin="0.1";

WEBSERVICE CACHE

• Is a new type of cache which allows you tocache web services

• Just add cachedwithin to the cfinvoke call

• Can be stored with any driver

FILE CACHE

• Is a new type of cache which allows you tocache file actions

• Just add cachedwithin to the cffile call

• In addition the file functions allow theargument as well

• Can be stored with any driver

HONORABLE MENTIONS

QUERY CACHE

• For sure the most used caching feature

• Uses the sql, the params and the datasourceas keys

• Can be stored with any driver

QUERY CACHE EXAMPLE

qRet = queryExecute(

sql:"SELECT TOP 10 name, zip FROM customers",

options: {

cachedWithin:0.1

datasource:"test",

tags: ["Test1", "Test2"]

}

);

QUERY CACHE EXAMPLE

objectCache action="clear" tags="Test1";

QUERY CACHE UNDER THE HOOD

• Lucee stores the result of the query in thecache

• It creates a hash of the SQL, the params andthe other attributes

• When the time is up, the cached element will be removed from cache

QUERY CACHE UNDER THE HOOD

• When the query is reexecuted Lucee will return a pointer to the cached query

• It will always be a pointer to the query

UNLESS…?

CACHING UNDER LOAD

• Caching often helps solving performance problems

THE PROBLEM UNDER LOAD

• Do you really know how the application is used• Without tons of logging• Without DB profiler turned on• Without Application monitoring• Without accumulation of data

?

LEGACY APPLICATIONS

• Old, not perfectly maintained• Take a lot of time to investigate (Missing

knowledge)• Perhaps not worth rewriting• Old developer perhaps not available• Memory hog• Complex and large• Hard to tune Expensive to tune

HOW TO TUNE A LEGACY

APPLICATION

• Invest many resources

• Build up knowledge

• Have an expert look at the code

• Rewrite the whole app

• In short it is expensive

ARGUSCACHE

The best way to speed up your apps

• Designed for existing applications

• Analyzes the application behavior

• Analyzes the resources used

• Runs in the background

Here comes ARGUSCACHE

• Allows you to see what's going on

• Shows you whether you have potentioal for optimization

• Shows you the potential performance gain

ARGUSCACHE dashboard

The dashboard

• Running in the cloud

• Handling clusters

• Handling many web contexts

• Nice dashboard to manage everything

Current development

• 99.- US$ / month per context

• CFCamp Promo for early signups andtesters

• Site licence available

• Higher Discounts for support contractcustomers

Pricing

TALK TO ME / US

• Come see me or Micha at the Lucee booth

• Contact us gert@rasia.ch, michael@rasia.ch

• Challenge your application

• Get highly dicounted license of ArgusCache