Datameer X Event Bus is available with Datameer's Advanced Governance module.

Datameer's event bus pushes events that take place within workbooks and for permissions. Developers can create a plug-in to subscribe and listen to all or specific events that are being sent on the bus. These events can then be used to record or automate other processes. For example, sending an email out after a workbook has successfully completed.

Accessing Datameer's Event Bus

Build a plug-in that subscribes to workbook events following the directions on Using the Plug-in SDK with the DatameerEventBus extension.

This example is of a logging subscriber that listens to a specific event. The following is subscribed to all events that are published.

SimpleLoggingEventSubscriber.java

package datameer.das.plugin.prototypes.eventbus.extension;

import org.apache.log4j.Logger;
import datameer.com.google.common.eventbus.Subscribe;
import datameer.dap.sdk.event.DatameerEventBusSubscriber;

public final class SimpleLoggingEventSubscriber extends DatameerEventBusSubscriber {

    private final Logger _logger = Logger.getLogger(SimpleLoggingEventSubscriber.class);

    @Override
    public String getName() {
        return "Records every published event via Log4j";
    }

    @Subscribe
    public void handle(final Object input) {
        _logger.info(input);
    }
}

The plug-in can listen to multiple events simultaneously by adding in additional subscriptions as seen below:

@Subscribe
public void handle(final FileEvent input) {
    _logger.info(input);
}

Default property

Name	Default	Description
`event.bus.async.threads`	4	Determines if the Datameer X Event Bus should dispatch events asynchronously by specifying the number of background threads to be used. When an event begins, all registered subscribers for an event are run in sequence, so subscribers run quickly. If subscribers are in use that trigger an extended process (such as a database load) we recommend running the bus asynchronously.

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