log4j2 JDBC appender with Spring - spring

Question

Log4j2 JDBC appender can be setup using a pooled connection factory that is defined using calls and method (see log4j2 Appenders):
<ConnectionFactory class="net.example.db.ConnectionFactory" method="getDatabaseConnection" />
Using Spring I have already a defined datasource that is providing a pooled connection :
<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${db_driver_class}" />
<property name="url" value="${db_jdbc_url}" />
<property name="username" value="${db_username}" />
<property name="password" value="${db_password}" />
<property name="initialSize" value="10" />
<property name="maxActive" value="100" />
<property name="maxIdle" value="50" />
<property name="minIdle" value="10" />
<property name="validationQuery" value="select 1" />
<property name="testOnBorrow" value="true" />
I would like to use the the Spring connection pool for the JDBC appender. Any idea how can this be done ?
thanks
Raz

Answer 1

I mange to create a 3-steps solution :
Define a bean in spring context that provide access to a data
source
Build an implementation of the bean that provide the
desired connection.
Build a static wrapper that can be accessed by the log4j JDBC appender.
1st step - bean declaration :
<bean id="springConnection" class="com.dal.entities.SpringConnection" scope="singleton">
<property name="dataSource" ref="myDataSource" />
the 2nd step - bean implementation - is also simple :
class SpringConnection {
private DataSource dataSource;
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
Connection getConnection() throws Exception {
return dataSource.getConnection();
}
}
the 3rd part - wrapper with static method - is a bit more complex:
public class SpringAccessFactory {
private final SpringConnection springCon;
private static ApplicationContext context;
private interface Singleton {
final SpringAccessFactory INSTANCE = new SpringAccessFactory();
}
private SpringAccessFactory() {
this.springCon = context.getBean(SpringConnection.class);
}
public static Connection getConnection() throws Exception {
return Singleton.INSTANCE.springCon.getConnection();
}
public static void setContext( ApplicationContext context) {
SpringAccessFactory.context = context;
}
}
There are - however - 2 issues I found so far:
You need to initialize the spring context and send it into the wrapper (SpringAccessFactory.setConetxt) before you start using the logger
initializing spring context early in program may trigger #PostConstruct methods (if any exists), before you plan to do so.....