What is a Resonate Application Node?

A Resonate Application Node can be described as a deployed bundle of code that has a top-level function registered with and run by resonate.run().

The call to resonate.run() creates a top-level promise in the call graph.

To handle throughput and availability, you can have many Application Nodes, each running the same bundle of code.

If we take the TypeScript SDK quickstart tutorial as an example, the "bundle of code" is the three functions downloadAndSummarize(), download() and summarize().

import { Context } from "@resonatehq/sdk";

// downloadAndSummarize is the top level function that awaits on the download and summarize functions.
export async function downloadAndSummarize(ctx: Context, url: string) {
  // Download the content from the provided URL
  let content = await ctx.run(download, url);
  // Summarize the downloaded content
  let summary = await ctx.run(summarize, content);
  // Return the summary of the content
  return summary;
}

async function download(ctx: Context, url: string): Promise<string> {
  // ...
  return new Promise((resolve, reject) => {
    resolve("download complete");
  });
}

async function summarize(ctx: Context, text: string): Promise<string> {
  // ...
  return new Promise((resolve, reject) => {
    resolve("summary of text");
  });
}

This code could be deployed to many hosts, each considered an Application Node.