4 mins tutor / Installing
Download
Download distribution from Sourceforge. Unpack.Software requirements
To run the example you need:- Java SDK >=1.4. 1.5 seems to work also.
- Ant
Run Ant
Run ant from command line or your favourite IDE:apollo-13:59:56$~/tmp/pat> ant
Buildfile: build.xml
help:
[echo]
[echo] You may run several ant targets:
[echo]
[echo] > ant skeleton-app
[echo] >
[echo] > ant tests
[echo] > ant tests2
[echo] >
[echo] > ant run-demo-withSnapshot
[echo] > ant run-demo-withoutSnapshot
[echo] > ant run-performance-demo
[echo]
BUILD SUCCESSFUL
Total time: 0 seconds
We'll work with skeleton-app target..
Change directory to your new base directory for first application:
> cd src/skeleton/
> dir
> Main.java Transfer.java World.java
View those three files. One of them is Java application: Main. The other two are PAT classes. One of them is root class and the other is business object.
Root
The requirement of PAT is to have a root class, that will have indirect references to all other business objects. It is not so scary as it sounds :)
In our first app we have one business object: Transfer. As we see the root class: World - it simply consists of list of Transfer objects.
Transactions
The only transaction in our example is transfer() method of World class. It simply adds empty object to a list, every time it's executed.Application
Main class simply creates root object and executes transaction on it.Running
Just run on command line or through your favourite IDE:Run it several times, so you'll see it really works. The amount of transfers
is increasing every time the application is run.
Database files (Prevayler's files) are held in
P-databases/skeleton-app/ directory by default.
Editing
Feel free to change those classes. For more examples see another demo app.Problems?
If there are any, try to look in Common problems. If it fails, go and ask.
Docs:
About
Framework
For Prevayler users
Success story: Ilybra
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