Tomcat interceptors

This is my attempt at a Tomcat JDBC interceptor. This interceptor will collect timing and number of calls metrics and publish them to a Statsd server.

The following parameters are required to configure the interceptor:

• hostname: the hostname of the Statsd server (for example: localhost)
• port: the port of the Statsd server (for example: 8125)
• sampleRate: to make sure we don't impact performances too badly, we only get statistics for a fraction of the requests (for example: 0.1)
• prefix: the prefix used to classify the metrics (for example: myapp.jdbc)

The interceptor can be configured as follow:

<Resource name="jdbc/TestDB"
          type="javax.sql.DataSource"
          factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
          jdbcInterceptors="ch.ledcom.tomcat.interceptors.StatsdInterceptor(hostname=localhost,port=8125,sampleRate=0.1,prefix=myapplication.jdbc)"
          username="myusername"
          password="password"
          [...]
          driverClassName="com.mysql.jdbc.Driver"
          url="jdbc:mysql://localhost:3306/mysql"/>

Of course, you will need to add the jar to the Tomcat lib directory. The jar containing this interceptor can be downloaded from Maven Repo1.

Maven generated site available as GitHub pages.