Configuration File : icCube-notification.xml

icCube allows for being notified about various internal activities. For example, administrators may be notified via eMail that a schema has been re-loaded or updated. This service is configured via the icCube-notification.xml file.

Configuration Overview

Notifications are configured via a list of notification listeners. Each listener is filtering notifications (e.g., errors vs warnings) to be dispatched to a given transport service (e.g., eMail).

Here is an example of configuration that is reporting all internal errors to the icCube support (hopefully none.) Note that up-to-date information is available in the configuration file delivered with icCube:


<icCubeNotificationConfiguration>

    <listener>

        <filter>
            <type>INTERNAL_ERROR</type>
        </filter>

        <transporter>

            <id>icCube Support</id>

            <service>eMail</service>

            <param>
                <name>from</name>
                <value>icCube@yourDomain.com</value>
            </param>

            <param>
                <name>to</name>
                <value>support@icCube.com</value>
            </param>

        </transporter>

    </listener>

</icCubeNotificationConfiguration>

Filter

Each listener can define a filter to decide which notification is going to be dispatched; no filter meaning all notifications are accepted by this listener. Three fields are available:

level : the severity level of the notification (INFO, WARNING, ERROR)
type : e.g., INTERNAL_ERROR, SCHEMA_FULL_LOAD, SCHEMA_UNLOAD, etc...
schema : the name of the schema the notification is attached to

Each field accepts JAVA regular expressions. For example, the following filter is accepting warning and error notifications:


<filter>
    <level>WARNING|ERROR</level>
</filter>

This filter is accepting all warnings about schema life cycle activity:


<filter>
    <level>WARNING.*</level>
    <type>SCHEMA.*</type>
</filter>

Message Types

The following types of notifications are available and can be used in the type field of the filters:


INTERNAL_ERROR
  An unexpected error within the system (typically reported to icCube support).

LICENSE_EXPIRY_WARNING
  The license is about to expire ( 30 - 15 - 1 day warnings ).

SERVER_READY
  The icCube server has been successfully started and is ready.

SCHEMA_FULL_LOAD
  A full schema load (vs. incremental load).

SCHEMA_INCREMENTAL_LOAD
  A schema has been successfully updated (vs. full load).

SCHEMA_INCREMENTAL_LOAD_DEACTIVATED
  A schema update (vs. full load) has done nothing due to incremental load being de-activated
  since a previous incremental load on error.

SCHEMA_INCREMENTAL_LOAD_ERROR
  A schema has been unsuccessfully incremental loaded (the schema is in an uncertain state).

SCHEMA_FULL_LOAD_ERROR
  A schema has been unsuccessfully fully loaded.

SCHEMA_LOAD_ERROR
  A schema has been unsuccessfully loaded (could not determine if incremental load or full load).

SCHEMA_LOAD_CANCELLED
  A schema load request has been cancelled.

SCHEMA_UNLOAD
  A schema has been successfully unloaded.

SCHEMA_PARTITIONS_UNLOADED
  Schema: unload partitions successful.

SCHEMA_PARTITIONS_LOADED
  Schema: load partitions successful.

SCHEMA_PARTITIONS_LOAD_FAILED
  Schema: load partitions on error: the schema state is still consistent
  (e.g., SELECT error, authorization error, etc...).

SCHEMA_PARTITIONS_LOAD_ERROR
  Schema: load partitions on error: the state of the schema is uncertain.

ALERT
  An alert has been triggered and is positive.

Transport Services

Along with its filter, a listener is deciding which transport service is going to deliver the notifications. icCube is currently providing an eMail service (via the configuration of an outgoing SMTP server); have a look to the next paragraph to see how to implement your own service. The following is demonstrating how to configure a GMail SMTP server via SSL. The icCube implementation is based on JavaMail and accept all the parameters as defined by this standard; the icCube.username and password are the (optional) credentials required to connect to your SMTP server:

<transportService>

    <id>eMail</id>

    <service-class>crazydev.iccube.notification.transporter.email.OlapNotificationEmailJavaMailService</service-class>

    <param>
        <name>icCube.username</name>
        <value>...</value>
    </param>

    <param>
        <name>icCube.password</name>
        <value>...</value>
    </param>


    <param>
        <name>mail.smtp.host</name>
        <value>smtp.gmail.com</value>
    </param>

    <param>
        <name>mail.smtp.socketFactory.port</name>
        <value>465</value>
    </param>

    <param>
        <name>mail.smtp.socketFactory.class</name>
        <value>javax.net.ssl.SSLSocketFactory</value>
    </param>

    <param>
        <name>mail.smtp.auth</name>
        <value>true</value>
    </param>

    <param>
        <name>mail.smtp.port</name>
        <value>465</value>
    </param>

</transportService>

User Defined Transport Service

The configuration of the notification service is fully generic and you can provide your own transport services. For that purpose you need to provide a JAVA class that implements the interface crazydev.iccube.notification.transporter.OlapNotificationTransportService and specify this class name in the service-class configuration field of the transportService. As an example, the following code is implementing a transport service that keeps notifications in memory:

public class InMemoryTransportService implements OlapNotificationTransportService
{
    private final List<OlapNotification> notifications = new ArrayList<OlapNotification>();

    private String id;

    public TransportService()
    {
    }

    @Override
    public String getId()
    {
        return this.id;
    }

    @Override
    public void configure(OlapNotificationTransportServiceDefinition configuration)
        throws OlapNotificationServiceException
    {
        this.id = configuration.getId();
    }

    @Override
    public OlapNotificationServiceTransporter transporter(OlapNotificationTransporterDefinition configuration)
        throws OlapNotificationServiceException
    {
        return new Transporter(this, configuration.getId());
    }

    public void handleNotification(OlapNotification notification)
    {
        notifications.add(notification);
    }
}

public class Transporter extends OlapNotificationServiceTransporter
{
    private final InMemoryTransportService service;

    private final String id;

    public Transporter(InMemoryTransportService service, String id)
    {
        this.service = service;
        this.id = id;
    }

    @Override
    public String getId()
    {
        return id;
    }

    @Override
    public String asLogInfo()
    {
        return id;
    }

    @Override
    public void handleNotification(OlapNotification notification)
    {
        service.handleNotification(notification);
    }

}

and the configuration of a listener dispatching all the notifications to this transport service is as follows:


<listener>

    <transporter>

        <id>Test</id>
        <service>In Memory</service>

    </transporter>

</listener>

<transportService>

    <id>In Memory</id>
    <service-class>InMemoryTransportService</service-class>

</transportService>

Next chapter : Environment Variables.