Hands on Lab Manual Coherence Introduction

Transcription

1 Hands on Lab Manual Coherence Inroducion hp://

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4 Exercise: Your firs Coherence-based Java Applicaion Objecive: Develop a simple Java console-based applicaion o access, updae and removing simple ypes of informaion from a Coherence clusered cache. Duraion: 30 minues. Knowledge: Unlike Clien-Server applicaions, where clien applicaions ypically connec and disconnec from a server applicaion, Coherence-based Clusered applicaions simply ensure hey are in a Cluser, afer which hey may use he services of he Cluser. More specially, Coherence-based applicaions ypically do no connec o a Cluser of applicaions; hey become par of he Cluser. UsefulTip: To change he level of logging produced by Coherence, use he following JVM parameer: -Dangosol.coherence.log.level=level where level is a number beween 0 and 9. The defaul is 5. A value of 0 means no logging. A value of 9 means exremely verbose. A value of 3 is ofen useful enough for mos applicaion developmen. SoluionFiles home/oracle/labs/coh_labs/yourfirscoherenceapplicaion.java Seps 1. Sar he defaul coherence cache server. cd /labs/wls1211/coherence_3.7 bin/cache-server.sh 2. Sar he Coherence Console in a separae erminal window /labs/wls1211/coherence_3.7/bin coherence.sh cache mycache ge message pu message This is a message in mycache 3. In he Coherence Java Documenaion (javadoc), shipped in he $COHERENCE_HOME$/lib folder, invesigae he mehods available on he CacheFacory class.

5 4. Develop a simple Java console applicaion ha uses he CacheFacory class o join a cluser (using he ensurecluser mehod) and hen leave he cluser (using he shudown mehod). 5. Exend your applicaion o display (using he Sysem.ou.prinln) he Cluser objec reurned from he ensurecluser mehod. 6. Using javadoc, invesigae he mehods available on he NamedCache inerface. 7. Exend your applicaion o use he CacheFacory mehod gecache o acquire a NamedCache for he cache called mycache 8. Wih he NamedCache insance, use he ge mehod o rerieve he value for he key message (he same key used in he Exercise: Tesing a Coherence Insallaion) 9. Oupu he value o he sandard ou using he Sysem.ou.prinln( ); mehod. 10. Using he running Coherence Shell, change he value of he key message. Re run your applicaion o see he changed values. 11. Rerun your applicaion wih he JVM parameer -Dangosol.coherence.disribued.localsorage=false. Is he oupu of he applicaion differen from previous execuions? 12. Shudown all of your Cache Server and Coherence Shell insances hen rerun your applicaion (wih he above JVM parameer se). Is he oupu differen? Quesions: 1. If you change he value of he message key in your applicaion (using he pu ) mehod, is he new value available via he Coherence Shell? 2. Wha does he JVM parameer -Dangosol.coherence.disribued.localsorage=false do o a Coherence Java process?

6 Exercise 2: Caching an Objec (using Java Serializaion) Objecive: Creae a simple domain objec ha can be placed ino a Coherence Cache. Duraion: 30 minues. Prerequisies: A solid undersanding of he rules for Java Serializaion. hp://java.sun.com/developer/echnicalaricles/programming/serializaion/ has an overview. Knowledge: Placing any non-primiive Objec ino a Coherence Cache requires he said class o be Java Serializable, he reason being, such insances may need o be ranspored across process boundaries ie: beween Java Virual Machines, across neworks or processes on he same physical machine. The sandard way o achieve such ranspor is o Serialize, ransmi and Deserialize he objec. Coherence requires Objecs placed in a Cache o be Serializable. SoluionFiles home/oracle/labs/coh_labs/endofdaysocksummary.java home/oracle/labs/coh_labs/cacheanobjec.java Seps 1. Creae a Java class called EndOfDaySockSummary ha implemens he java.io.serializable inerface o capure he open, high, low, close and adjused close prices (in dollars) of a Sock (called a symbol) for a specific dae ogeher wih he rading volume. Example aribue definiions for he class could be as follows; privae Sring symbol; privae long dae; privae double openprice; privae double highprice; privae double lowprice; privae double closeprice; privae double adjusedcloseprice; privae long volume; 2. Define a mehod called gekey() o reurn a Sring ha is a combinaion of he symbol and dae aribues.

7 3. Declare a serialversionuid. 4. Define a public defaul consrucor EndOfDaySockSummary() 5. Define a public consrucor ha acceps values for all of he aribues specified above. 6. Creae a console applicaion called CacheAnObjec (which conains a main mehod) ha creaes an insance of an EndOfDaySockSummary class and places (using he NamedCache pu mehod) he said insance ino a Coherence cache called dis-eodsocksummaries and hen rerieves i o display on he console. Quesions 1. Wha happens if you forge o implemen a defaul no argumens consrucor for he EndOfDaySockSummary class? If you don know, commen i ou and aemp o run your applicaion again.