LiveView Project Tutorial

< Previous		Next >

Introduction

This topic takes you through the steps to create a new TIBCO LiveView project, create and configure a LiveView data table, generate an EventFlow application module that feeds the LiveView table, and create a feed simulation to send data into the EventFlow module's table. The steps go on to run the LiveView project, and view the results in TIBCO LiveView™ Desktop.

This tutorial's project has the following characteristics:

Has a single, three-column LiveView data table configured to contain stock symbol, price, and quantity values.
Has a wizard-generated TIBCO StreamBase EventFlow™ module that uses a feed simulation adapter to accept input from a StreamBase feed simulation, then emits that data to an output stream.
Uses the LiveView Configuration Editor to create all required LiveView tables and features.

Creating a New Project

In Studio, make sure that you are in the SB Authoring perspective, which presents the views most commonly used for editing StreamBase modules. If you're in another perspective, click the SB Authoring button in the Perspective bar in the top right corner of the Studio window:

If this button is not visible, click the Open Perspective button () and select SB Authoring from the resulting dialog.
Click the New StreamBase Project button () in Studio's top-level toolbar, or invoke File>New>StreamBase Project.
In the StreamBase Project panel, enter my-first-liveview-project in the Project name field. Select LiveView Fragment as the project type. Click Next.
in the Configure Maven Artifact panel, enter com.example.deptname in the Group Id field. (If your site already has a standard Group ID for Maven projects, you can use that name instead.)

Notice that the Package Name field is automatically generated by combining the Group ID and the Artifact ID, which is the same as the Project Name you specified in step 3. Hyphens in the Artifact ID are changed to underlines, according to Java and Maven package name standards. Do not change the Package Name.
Click Next to view the following panel.

Leave these settings in place for now. Click Finish.
Click Finish. This triggers several actions:
- A folder for the my-first-liveview-project appears in the Project Explorer view.
- The LiveView Project Viewer opens in the Editor space in Studio's upper right, showing an empty canvas.
- On top of the empty Project Viewer, the New Data Table wizard opens, which is described in the next section.
- On top of the wizard, the New LiveView Project Created dialog may appear. Read the dialog and optionally select the Do not show this again check box.
The newly created project is organized in the standard Maven project structure:

Using the New LiveView Data Table Wizard

LiveView data tables are containers for streaming data. They can receive incoming streamed data from multiple sources, including EventFlow applications, external data sources, and other LiveView tables. This tutorial continues the New Project steps in the previous section to configure a LiveView data table with three fields.

The New Data Table wizard is still open from the last step in the previous section. (If not, open it with File>New>TIBCO LiveView Data Table, or right-click the empty Project Viewer canvas and select New Data Table.)
Enter Orders in the Table Name field.

In the Interface/Application field, define all fields locally is selected by default. In the Schema grid section, click the green plus sign to add the following fields to the grid:

Field Name	Type
Symbol	string
Price	double
Quantity	int

The Description column for each field is optional.

Click Next.
Make the Symbol field the primary key for this table in one of the following ways:
- In the Available Fields list, select Symbol, then click the right-pointing arrow next to the Index Fields label.
- In the Available Fields list, select Symbol then drag it to the Index Fields area with the mouse.
- Double-click Symbol.
Click Finish. This adds Orders.lvconf to the src/main/liveview folder for this project in the Project Explorer view, and places a green Data Table icon labeled Orders on the Project Viewer canvas.

The data table is now configured and ready to receive data.

Generate an EventFlow Module to Feed the Data Table

StreamBase Studio provides a Data Source wizard that can generate a StreamBase EventFlow module with output stream schemas preconfigured to match a particular LiveView data table's configuration. Follow these steps:

On the LiveView Project Viewer's canvas, right-click and select Data Source. The New LiveView Data Source wizard opens.
Select my-first-liveview-project as the parent folder.
In the EventFlow™ Application file name field, enter OrdersDataSource.
Leave the Create a sample feed simulation check box selected.
Use the drop-down menu selector in the Target Table field to select Orders.

Click Finish. This triggers several actions:

Three new files are added to the project in the Project Explorer view:

OrdersDataSource.sbapp

OrdersDataSource.sblayout

Which are located in src/main/eventflow.

Orders.sbfs

Which is located in src/main/resources.

A purple Data Source icon is added to the Project Viewer, with an arrow linking it to the Data Table icon.
The wizard creates two StreamBase interface files, places them in a new src/main/eventflow/lv-interfaces folder.

These interface files contain the schemas for the Orders data table's input and output streams. Using interface files allows the schemas to be used and reused efficiently throughout the project.
Studio opens the EventFlow Editor for the newly created module OrdersDataSource.sbapp.

In the EventFlow Editor:
1. Double-click the DataOut icon, select the General tab in Properties view, and make sure the check box for Always expose Stream for Dequeue is selected.
2. Study the Data Source EventFlow module generated for you. Notice that it uses a Feed Simulation Input adapter to send generated tuples with the correct schema to its DataOut stream, which feeds into the Orders Data Table's input stream.
3. Double-click the InputAdapter icon, select the Adapter Properties tab of the Properties view, and notice that the generated file Orders.sbfs is preselected in the Feed Simulation File field. Notice that the feed simulation is configured to start automatically when the containing EventFlow module is started.
  
  This feed simulation file uses the Default generation method, in which random string and numeric values are generated as input data. After you have tested the generated LiveView application, you can come back and specify more precise customized data for each input field.
Use File>Save or Ctrl+S on Windows or command+S on macOS to save the current project state.

Test the EventFlow Module

This optional step is only to provide visual confirmation that the data source EventFlow module receives correctly formatted data from its connected feed simulation adapter.

Run the OrdersDataSource.sbapp application. Right-click in the editor canvas or on the orders.sbapp file in the Project Explorer view and select Run As>EventFlow Fragment.
In the SB Test/Debug perspective, observe the Output Streams view. Look for the outgoing data stream to be automatically populated by the associated feed simulation.
Click on a row in the Output Streams view and examine the tuple contents. Each tuple shows a generated value for Symbol, Price, and Quantity fields. Click several more rows as the stream flows past.

Notice that the DataOut stream shows five LiveView-internal fields with null values for now, in addition to the Symbol, Price, and Quantity fields you configured. These last three fields receive randomly generated data.
When done, press F9 or click the Terminate EventFlow Fragment () button in Studio's top-level toolbar.

Run the LiveView Application

Now you are ready to compile and run the LiveView project on an instance of LiveView Server.

For clarity, close the EventFlow Editor session that is editing the OrdersDataSource.sbapp module.
Run the LiveView project in one of several ways:
1. In the LiveView Project Viewer, click the green Run button in the upper right (), next to the Help button.
2. Select the my-first-liveview-project project in the Project Explorer view. Right-click and select Run As>LiveView Fragment.
3. Select the my-first-liveview-project project in the Project Explorer view. From Studio's top-level menu, select Run>Run As>LiveView Fragment.
The Console view shows several messages as LiveView Server compiles the project and starts. This startup process can take several minutes, depending on the configuration of your computer.
When you see the message All tables have been loaded in the Console view, you are ready to connect a client application to this server instance to view the stream of data flowing through this project's data table.

Connect a LiveView Client

To see the data flowing through your running LiveView data table, you must connect a LiveView client to the server and use it to run a query using the LiveQL query language. The simplest query for this application is:

select * from Orders;

or perhaps

select * from Orders limit 50;

The following LiveView Client applications are provided with LiveView or as related downloads:

lv-client, a command line utility, is included with LiveView.
TIBCO LiveView™ Web is a web browser based client interface licensed and downloaded as a related product.
TIBCO LiveView™ Desktop is a Windows or macOS desktop client application licensed and downloaded as a related product.

In addition, you can write LiveView clients of your own using the provided Java or JavaScript Client APIs.

The following subsections give brief instructions to connect each of these client types. The LiveView server is presumed to be running and using the default port 10080 for these sections.

Connect and Run lv-client

Follow these steps:

Open a StreamBase Command Prompt on Windows or a StreamBase-configured Terminal session on macOS.
With the LiveView application running as described above, enter the following command at the prompt:
```
lv-client "select * from Orders limit 30;"
```
You may need to specify a LiveView URL for the running server:
```
lv-client -u lv://localhost:10080 "select * from Orders limit 30;"
```

Connect and Run LiveView Web

The lvweb.war file that provides the server underpinnings of LiveView Web is installed by default with each new LiveView project. Look for this file in the src/main/liveview/lv-user-webapps folder of your project.

With LiveView Web installed as part of your project, use any modern browser to connect to your running server. Use the following steps:

With LiveView Server running, connect a web browser to:
```
http://localhost:10080/lvweb
```
Click New Page to create a new query page, perhaps named Orders Table.
Click New Card to create a query card.
In the dark blue section on the right, provide a title for your query card to replace the Untitled 1 label, such as Orders Table - All. Click at the end of the current label and use the backspace key to erase it, or hold down the Shift key and use the left arrow key to highlight the current label.
Still in the dark blue section, open the Query Builder section.
From the Choose a table control, select Orders.
The default query select * from Orders is entered for you in the Query field.
Click Save. This populates the Orders Table - All card on the left.
Click the X in the upper right of the dark blue configuration area to close it.
Grab the bottom right corner of the Orders Table -- All card to resize it.
Experiment with creating other pages with different queries or with a different visualization.
When done, close the browser tab. LiveView Web preserves your configured table in the LiveView server metadata.

Connect and Run LiveView Desktop

To use the LiveView Desktop client, you must download and install it. Once installed, run LiveView Desktop with the following steps:

Start LiveView Desktop with one of the following methods:
- On Windows, invoke Start>All Programs>TIBCO>LiveView n.m>LiveView Desktop n.m.
- On macOS, use Spotlight or Launchpad to locate and invoke the app named liveview.
- On Linux, run the following command:
```
/opt/tibco/sb-cep/n.m/liveview/desktop/liveview &
```
Any of these methods opens the Connect to LiveView dialog.
In the dialog:
1. Type any username and no password.
2. In the Server field, enter localhost.
3. Specify a Local workspace folder with any name.
4. Click OK.
When LiveView Desktop connects to the server, you see a list of the tables on the left. Most LiveView tables are system management tables that begin with LV.
Locate the Orders table in the list of tables and double-click its name.
This opens the Orders table in a data grid view on the right side, running with the default query select * from Orders.
Experiment with different queries and different visualizations of the data.
When done, exit LiveView Desktop.

Close and Shut Down

When done:

Close and exit any LiveView Web or LiveView Desktop client connections.
Stop LiveView Server with Ctrl+F9 on Windows or command+F9 on macOS, or by clicking the Terminate LiveView Fragment icon () in StreamBase Studio's top-level toolbar.