Page Comparison

User Stories

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• Pushtopic: should be optional. The plugin should attempt to create one if it is not specified. If there is an error creating it, a human readable error message should be displayed. At the end of the run, the pushtopic should be deleted, if the plugin created it. If a user overrides it, the plugin should not manage the pushTopic
• Should support the same requirements regarding Object and SOQL query as in the Salesforce Batch Source
• Login URL should be configurable
• Instance URL should be derived from the response of the login API

General Overview of Salesforce Streaming API

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{
        "name": "SalesforceRealtime",
        "plugin": {
        "name": "SalesforceRealtime",
        "type": "realtimesource",
        "label": "SalesforceRealtime",
        "properties": {
           "clientId": "XXXXXXX",
           "clientSecret": "XXXXXXXXX",
           "username": "XXXXX",
           "password": "XXXXX",
           "topic": "/events/InvoiceStatementUpdates", 
           "outputSchema": "Name:String",                 
           "loginUrl": "https://login.salesforce.com/services/oauth2/token"
         }
       }
 }

Implementation

Salesforce streaming API will be used for realtime plugin.

Cometd BayeuxClient is used to subscribe to events. When event is received the data is added to a blockingQueue.

Class SalesforceReceiver extends Receiver from Spark Streaming and is used as a receiver stream.

SalesforceReceiver#onStart:

• 1. Establish connection to instance_url/cometd/45.0
  
• 2. Start thread which moves data from blockingQueue to Spark Stream