Output logger Event Adapter

The output logger event adapter logs the output events emitted from the processing engine.

Configuring output logger event adapter

You can configure the output logger event adapter using the management console or using a configuration file.

Configure using the management console

Follow the steps below to configure output logger event adapter using the management console. This deploys the event adapter in the <PRODUCT_HOME>/repository/deployment/server/outputeventadaptors/ directory.

Log in to the product's management console, and click Configure.
Click Output Event Adaptors in the Event Processor Configs menu, and then click Add Output Event Adaptor.
Enter outputLogAdaptor for Event Adaptor Name, and select logger for Event Adaptor Type as shown in the below example.
Click Add Event Adaptor.

Configure using a configuration file

Follow the steps below to configure output logger event adapter using a configuration file.

Create an XML file with the following output logger event adapter configurations. Output event adapter implementation must start with <outputEventAdaptor> as the root element.
```
<outputEventAdaptor name="outputLogAdaptor" statistics="disable"
  trace="disable" type="logger" xmlns="http://wso2.org/carbon/eventadaptormanager"/>
```
Add the XML file to the <PRODUCT_HOME>/repository/deployment/server/outputeventadaptors/ directory. Since hot deployment is supported in the product, you can simply add/remove output event adapter configuration files to deploy/undeploy output event adapters to/from the server.

After an adapter is successfully added, it gets added to the list of adapters displayed under Event Processor Configs in the Configure menu of the product's management console. Click Edit to change its configuration and redeploy it. This opens an XML-based editor allowing you to edit the event adapter configurations from the UI. Do your modifications and click Update. You can also delete it, enable/disable statistics or enable/disable tracing on it using the provided options in the UI.

Configuring output logger event adapter message properties

The configured output event adapters are used in event formatters. With output event adapter message properties, event formatters are able to extract data from event streams and format the output events. Message properties specific to output event adapters of the logger type can be configured as follows.

Log into the CEP Management Console. For detailed instructions, see Running the Product.
Click the Configure tab and then click Event Formatters to open the Available Event Formatters page.

Click the name of the event formatter to which the relevant output event adapter is connected. This opens the Event Formatter Details page.
output logger event adapter message properties The message properties of a logger output event adapter are described below. Change the property values as required.

Property	Description
Unique Identification	Unique identification for the log, such as a topic.
Output Event Type	The outgoing event type to be mapped. The output logger event adapter supports text, XML, and JSON mappings.