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The following sections describe how to replace the default H2 databases database with PostgreSQL.

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Once you have setup the physical database as explained in the previous step, the next step is to enable the connectivity between your MB server and the database. This can be done by simply copying the relevant database drivers to your server, and then configuring the datasources in MB to link to the new database. See the instructions given below.

Copying the database drivers

Download the PostgreSQL JDBC4 driver and copy it to the <MB_HOME>/repository/components/lib/ directory.

Setting up datasource configurations

The connection between physical databases and the server is established through datasources. The master-datasources.xml file (stored in the <MB_HOME>/repository/conf/datasources directory) is the default datasource configuration file that is shipped with WSO2 products. In the case of WSO2 MB, since we use two databases (Carbon database for registry/user management data and the MB-specific database for storing MB data), the master-datasources.xml file should contain two separate datasource configurations corresponding to the two databases.

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Open the <MB_HOME>/repository/conf/datasources/master-datasources.xml file. This is where datasources are configured to point to the databases used by the Message Broker. This file consists of commented out configurations for datasources. The datasource configuration for PostgreSQL is among these. The changes made to this file must be done in both broker nodes.

Uncomment or add the following configuration into the master-datasources.xml file. Update the JDBC URL to correctly point to your database and enter the username and password for the PostgreSQL database user with the proper permissionsYou simply have to update the url pointing to your PostgreSQL database, the username and password required to access the database and the PostgreSQL driver details as shown below. Further, be sure to set the <defaultAutoCommit> element to false for the MB database.

Code Block

<datasource>
          <name>WSO2_MB_STORE_DB</name>
          <jndiConfig>
              <name>WSO2MBStoreDB</name>
          </jndiConfig>
          <definition type="RDBMS">
          <configuration>
                  <url>jdbc:postgresql://localhost/wso2_mb</url>
                  <username>postgres</username>
                  <password>postgres</password>
                  <driverClassName>org.postgresql.Driver</driverClassName>
                  <validationQuery>SELECT 1</validationQuery>
                  <validationInterval>30000</validationInterval>
                  <defaultAutoCommit>false</defaultAutoCommit>
              </configuration>
          </definition>
</datasource>

The elements in the above configuration are described below:

Element Description

url The URL of the database. The default port for a DB2 instance is 50000.

username and password The name and password of the database user.

driverClassName The class name of the database driver.

validationQuery The SQL query that will be used to validate connections from this pool before returning them to the caller.

validationInterval The indication to avoid excess validation, and only run validation at the most, at this frequency (time in milliseconds). If a connection is due for validation, but has been validated previously within this interval, it will not be validated again. defaultAutoCommit Specifies whether each SQL statement should be automatically committed when it is completed. By default, this element is set to false

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defaultAutoCommit

It is required to disable auto committing by setting this property to false for the MB database. This means that multiple SQL statements will be committed to the database as one transaction, as opposed to committing each SQL statement as an individual transaction.

For more information on other parameters that can be defined in the <MB_HOME>/repository/conf/datasources/master-datasources.xml file, see Tomcat JDBC Connection Pool.
Open the <MB_HOME>/repository/conf/broker.xml file. This is the root configuration file of WSO2 MB. The changes made to this file must be done in all the MB nodes.

In the broker.xml file we need to use the PostgreSQL message store and Andes context store. To do this, uncomment or add the following configuration.

Code Block

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<persistence>
  <messageStore class="org.wso2.andes.store.rdbms.RDBMSMessageStoreImpl">
        <property name="dataSource">WSO2MBStoreDB</property>
  </messageStore>

  <andesContextStore    class="org.wso2.andes.store.rdbms.RDBMSAndesContextStoreImpl">
        <property name="dataSource">WSO2MBStoreDB</property>
  </andesContextStore>
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</persistence>

The elements in the above configuration are described below.

The fully qualified name of the respective implementation class should be defined under the class attributes of messageStore and andesContextStore elements. This implementation class will be used by MB to persist relevant information.
The <property> elements are used to define different properties for each store. The minimal property for starting each store is the dataSource property. Depending on the implementation, the required properties may differ.

Step 3: Creating database tables

To create the database tables, connect to the database that you created earlier and run the following scripts:

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Copying the database drivers

Setting up datasource configurations

Step 3: Creating database tables