ExternalMessaging

ExternalMessaging allows a flow to communicate with an external system via a predefined named channel.

The platform will provide an instance of ExternalMessaging to flows via property injection.

A Flow can send use this API to send messages to any external channel that has been defined as part of the CorDapp ({@see Defining External Messaging Channels}).

Example usage:

• Kotlin:

  
  class MyFlow : ClientStartableFlow {
     
     lateinit var externalMessaging: ExternalMessaging
  
     override fun call(requestBody: RestRequestBody): String {
         val myChannelName = "my channel"
  
         // Send a simple message to my channel
         externalMessaging.send(myChannelName, "hello")
  
         // Send a simple message with an ID to my channel
         externalMessaging.send(myChannelName,"id-1", "hello")
  
         return ""
     }
   }
  

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• Java:

  
  class MyFlow implements ClientStartableFlow {
  
     
     public ExternalMessaging externalMessaging;
  
     
     public String call(RestRequestBody requestBody) {
         String myChannelName = "my channel";
  
         // Send a simple message to my channel
         externalMessaging.send(myChannelName, "hello");
  
         // Send a simple message with an ID to my channel
         externalMessaging.send(myChannelName,"id-1", "hello");
  
         return "";
     }
  }
  

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