Karaf konffausta

Apache Karaf on OSGi standardin täyttävä valmis paketti valikoituja OSGi bundleja. Näppärinä ominaisuuksina mainittakoon mm. Felix gogo shell ja feature filet.

Feature fileillä voidaan määritellä mitkä bundlet asennetaan missäkin järjestyksessä. Olemme määrittäneet itse muutamia eri konfiguraatioita omaa softaa varten. Myös osasta karafin omista bundleista olemme hankkiutuneet eroon.

Karafissa on myös hyödyllinen maven-plugin jolla voi tehdä kustomisoidun karaf paketin. Käytämme tätä ominaisuutta, jotta saamme rakennettua paketin joka sopii aina testiympäristöistä tuontantoon. Kaikki konfiguraatiot, bundlet ja itse ympäristö on yhdessä tar-paketissa jonka voi purkaa ja ajaa missä vaan Java 8 koneessa.

Feature tiedostot ovat hyödyllisiä, mutta aiheuttavat myös harmaita hiuksia. Karaf parsiessaan ja asentaessaan bundleja (featureita) ei välttämättä anna kovin informatiivisia viestejä mikä on pielessä. Tämä tuli erityisen selväksi päivitettäessä karafia kolmosversiosta neloseen.

Muutama vinkki miten saada toimiva Karaf ympäristö aikaiseksi:

Aloita ensin pelkällä valmiiksi paketoidulla Karafilla ilman featurefileitä ja kokeile asentaa pelkästään yksittäisiä bundleja
Kun bundlet toimivat, tee yksi feature file joka voi olla myös bootissa ladattava
Jos käytät maven-pluginia, aja diffi sen tuottaman paketin sekä valmiiksi ladatun paketin välillä
Tarkasta aina lokaali maven repository ja vertaa sitä karafin system hakemiston sisältöön

Comments

I'm not a passionate developer

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Extracting object properties from an IFC file with IfcOpenShell

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Hubristic developer

Almost half of any Finnish generation goes through a shared experience: the conscript army. An integral part of that experience is learning military slang, a set way people in the army talk. The stories told with said jargon often spread outside of the barracks. It is not uncommon to hear strangers bonding together over beers reminiscing and feeling nostalgic about freezing cold nights spent in tents. There is a similar phenomenon detectable among us coders. To be part of the coder tribe, there is at least one type of story that one must master. That is - of course - ranting about legacy codebases. "Can you believe how much of a mess the previous coders left? Hear, hear!" There is no better way to onboard a new team member than to blame some previous B-team for all the murky parts of the system at hand. This can be seen as harmless, a subject for a good meme . Rarely do we hold real grudges against "the legacy folk" and can be the best of friends in a social gather

Koodihommia

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