PushEvent class abstract

Pub/Sub push event.

This class can be used in a HTTP server for decoding messages pushed to an endpoint.

When a message is received on a push endpoint use the PushEvent.fromJson constructor with the HTTP body to decode the received message.

E.g. with a dart:io HTTP handler:

void pushHandler(HttpRequest request) {
  // Decode the JSON body.
  request.transform(UTF8.decoder).join('').then((body) {
    // Decode the JSON into a push message.
    var message = new PushMessage.fromJson(body)

    // Process the message...

    // Respond with status code 20X to acknowledge the message.
    response.statusCode = statusCode;
    response.close();
  });
}

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