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Receiving Email Alerts

Purpose:

This application demonstrates how to send a single event via Single Simulation, and to generate alerts using filters when the threshold value is exceeded. Furthermore, it shows how to configure ESB Streaming Integrator Tooling to publish an alerts via e-mail. An alert is generated as an email when a high value transaction (i.e., where the value is over 5000) takes place.

Before you begin:

• Enable access to less secure apps in the gmail account you are using for this example via the Less SecureApps link.
  
• In the sample application, change the values for the following parameters in the @sink annotation as follows.
  
  • username -> business.rules.manager (This is the sender's username.)
    
  • password -> business-rules (This is the sender's password.)
    
  • address-> business.rules.manager@wso2.com (This is the sender's address.)
    
  • to -> template-manager@wso2.com (This is the receiver's address.)
    
  • subject -> Alert for large value transaction: cardNo: (This is the subject of the email.)
    Once you update the values for the above parameters, save the sample Siddhib application.
    

Executing the Sample

To execute the sample open the saved Siddhi application in Streaming Integrator Tooling, and start it by clicking the Start button (shown below) or by clicking Run => Run.

If the Siddhi application starts successfully, the following message appears in the console.

AlertsAndThresholds.siddhi - Started Successfully!.

Testing the Sample

To test the sample Siddhi application, simulate a single event for it via the Streaming Integrator Tooling as follows:

1. To open the Event Simulator, click the Event Simulator icon.

   

   This opens the event simulation panel.

2. To simulate events for the TransactionStream stream of the AlertsAndThresholds Siddhi application, enter information in the Single Simulation tab of the event simulation panel as follows.

   

   Field	Value
   Siddhi App Name	AlertsAndThresholds
   StreamName	TransactionStream

   As a result, the attributes of the Transactiontream stream appear as marked in the image above.

3. Enter values for the attributes as follows:

   

   Attribute	Value
   creditCardNo	1234567898765432
   country	SL
   item	mobile
   quantity	100
   price	5000

   Info

   To generate an email alert, you need to simulate an event where the transaction value (i.e., quantity * price) exceeds 5000. This is indicated by the [quantity * price > 5000] filter connected to the TransactionStream input stream.

4. Click Send.

Viewing the Results

To view the results, check the receiver Gmail inbox (i.e., Gmail specified via the to parameter in the sink configuration). The following is displayed.

Subject: Alert for large value transaction: cardNo:1234567898765432
Content:
creditCardNo:"1234567898765432",
country:"SL",
item:"mobile",
quantity:100,
price:5000

Click here to view the sample Siddhi application.

@App:name("AlertsAndThresholds")
@App:description('Simulate a single event and receive alerts as e-mail when a predefined threshold value is exceeded')

define stream TransactionStream(creditCardNo string, country string, item string, quantity int, price double);

@sink(type='email',
      username ='business.rules.manager',
      address ='business.rules.manager@wso2.com',
      password= 'business-rules',
      subject='Alert for large value transaction: cardNo:',
      to='receive.alert.account1@gmail.com, receive.alert.account2@gmail.com',
      port = '465',
      host = 'smtp.gmail.com',
      ssl.enable = 'true',
      auth = 'true',
      @map(type='text'))
define stream AlertStream(creditCardNo string, country string, item string, quantity int, price double);

--Filter events when quantity * price > 5000 condition is satisfied
@info(name='query1')
from TransactionStream[quantity * price  > 5000]
select *
insert into AlertStream;

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