Using Z2 with a Transaction Manager¶

(Work in progress)

This sample demonstrates how to use Z2 with the Atomikos transaction manager. There is another sample that shows how to use Z2 with a Spring configured transaction manager. See sample-jta-spring. In contrast to that, this sample is less sophisticated but probably better suited to understand the underlying mechanics.

The Wiki page How_to_TransactionManager explains the general principles behind transaction handling in Z2.

This sample is stored in z2-samples.jta-plain.

Pre-Requisites¶

This sample assumes the presence of a MySQL database system on localhost with a database called "z_tx_tests" for which a user "tx" with password "tx" has full permissions. If you have a running MySQL server these SQL commands do the trick:

create database z_tx_tests;
grant all on z_tx_tests.* to tx@localhost identified by 'tx';

Running the sample¶

This sample is run as explained in How to run a sample. The 5 minutes version:

mkdir install
cd install 
git clone -b master http://git.z2-environment.net/z2-base.core
git clone -b master http://git.z2-environment.net/z2-samples.jta-plain

# on Linux / Mac OS:
cd z2-base.core/run/bin
./gui.sh

# on Windows:
cd z2-base.core\run\bin
gui.bat

Verifying¶

When everything is up, go to http://localhost:8080/tx.plain. You see something like this:

And indeed, the implemented function is rather obvious: Manage a table of strings.

Now to the point...¶

The idea behind this sample is to provide a template for transaction manager integration. Note that before you integrate with a complete transaction management system, you should be sure that you need it. Distributed transactions come at a price in terms of complexity and overhead of local transaction logs. If you do not have multiple data sources, or if those have no strong inherent consistency requirement you may well be better off without a full-blown, XA capable transaction manager. Please also see How to transaction management.