Since I use HikariCP (which I can recommend) I use a DataSourceFactory to
configure my connections, something similar to the following pseudocode.
In this case you can read any available environment variables/properties to
provide configuration.
public static ServerRuntime createServerRuntime() {
return ServerRuntime
.builder()
.addConfig( "cayenne-project.xml" )
.addModule( b -> b.bind( DataSourceFactory.class ).to(
AppDataSourceFactory.class ) )
.build();
}
private static class AppDataSourceFactory implements DataSourceFactory {
@Override
public DataSource getDataSource( DataNodeDescriptor dataNodeDescriptor
) throws Exception {
final String dataNodeName = dataNodeDescriptor.getName();
if( dataNodeName.equals( "somenode" ) ) {
final HikariConfig config = new HikariConfig();
config.setUsername( "someuser" );
config.setPassword( "somepass" );
config.setJdbcUrl( "someurl" );
config.setMaximumPoolSize( 4 );
return new HikariDataSource( config );
}
if( dataNodeName.equals( "othernode" ) ) {
final HikariConfig config = new HikariConfig();
config.setUsername( "otheruser" );
config.setPassword( "otherpass" );
config.setJdbcUrl( "otherurl" );
config.setOtherStuff( ... );
return new HikariDataSource( config );
}
throw new IllegalArgumentException( "Unknown dataNode: " +
dataNodeName );
}
}
Cheers,
- hugi
> On 23 Apr 2021, at 14:32, Tony Giaccone <t...@giaccone.org> wrote:
>
> I have a datadomain with two datamaps, and two datasource each talking to a
> different database.
>
> Right now, I have had the datasource configured in the config file, but I
> need to remove that and set it programmatically, from an environment
> variable. Simple enough to do with a defauldata source, unclear how to do
> when you have multiple data sources and data nodes.
>
> After browsing through the code and the app as it's running, it's unclear
> to me how to do this.
>
> Does anyone know the secret sauce?
>
>
>
> Tony
