Overview of Visualizer

Oracle Complex Event Processing Visualizer, henceforth called Visualizer for simplicity, is a Web 2.0 application that consumes data from Oracle Complex Event Processing (or Oracle CEP for short), displays it in a useful and intuitive way to system administrators and operators, and, for specificied tasks, accepts data that is then passed back to Oracle CEP so as to change it configuration.

Navigational Overview of Visualizer

Left Pane: Displays a domain tree for the domain called WLEventServerDomain that includes all the objects contained in the domain, such as the server instances, the deployed applications and services within each server instance, and domain-level security configuration. The lower half of the right pane lists the items that are currently open, making it easy to return to or close the windows after you have navigated away from them.
Right Pane: Displays information about objects that you have clicked on in the left pane. The format of the information depends on the object; for example, if you click on a deployed application, the right pane shows general information about the application (General tab) as well as variuos visual representations of the event processing network of the application (Event Processing Network tab). If you click on a particular stage of the network, such as a stream or processor, the right pane shows general information about it as well as stage-specific information, such as the rules for a processor.

Figure 2-1 shows a domain that contains a single server instance called WLEventServer. The server contains two deployed applications: dataservices and fx; the fx application is currently opened. The right pane contains the configuration of the rules of the preprocessorAmer stage; in particular, preprocessorAmer has been configured with a single rule called UsdToEurRule.

Using Visualizer to Update Configuration Data

Although you can update much of the configuration of an Oracle CEP instance and its deployed applications, not all fields can be updated. The following bullets describe the rules that determine what fields can be updated.

Information in the EPN assembly file is static and thus read-only. Examples of this type of information include the stages of the EPN and how they are wired together.
Information in the stage configuration files can be modified, although not typically added to or deleted from; the next bullet lists the two exceptions. Examples of this type of information include the maximum size and threads of a stream.

When you are allowed to update fields on a Visualizer window, you will see three buttons: Modify, Commit, and Cancel. Click the Modify button to update the fields, then click Commit to commit the changes to the server or Cancel to cancel.

The EPL rules associated with a processor and the channels associated with an HTTP pub/sub server cannot be modified, but you can add or delete to the existing list of rules or channels.

For these two scenarios you will see buttons for adding and deleting rules or channels; the Modify button will not be provided.

Information in the server’s configuration file (config.xml) can be modified. An example of this type of information includes the configuration of work managers.

Server configuration updates also use the three buttons: Modify, Commit, and Cancel.

How to Invoke and Start Using Visualizer

Visualizer is itself an Oracle CEP application that is automatically deployed each time you start a server. To start using it, follow these steps:

Invoke the following URL in your browser:

  http://host:port/wlevs

where host refers to the name of the computer on which Oracle CEP is running and port refers to the Jetty NetIO port configured in for the server (default value 9002).

The port number is configured in the DOMAIN_DIR/config/config.xml file, where DOMAIN_DIR refers to the domain directory such as /beahome/wlevs30/user_projects/domains/wlevs30_domain. The port number is the value of the <port> child element of the <netio> object configured for the Jetty server, as shown in the following example (only relevant parts shown):

   <netio>
      <name>NetIO</name>
      <port>9002</port>
   </netio>

...

   <jetty>
      <name>JettyServer</name>
      <network-io-name>NetIO</network-io-name>
      ...
   </jetty>

For example, if your browser is running on the same computer as Oracle CEP and you are using the default port, invoke the following URL:

   http://localhost:9002/wlevs

In the Logon screen, enter the name and password of the administrator user you configured when you created the domain.

You are now ready to begin using Visualizer to manage, configure, and monitor Oracle CEP instances and the applications deployed to the server instances. For information on typical tasks, see:

Visualizer Help

Overview of Visualizer

Description of Visualizer

Navigational Overview of Visualizer

Using Visualizer to Update Configuration Data

How to Invoke and Start Using Visualizer