Demo hapi's caching of method results

hapi_cache.js

var Hapi = require('hapi');
var server = new Hapi.Server('localhost', 8000);

var add = function (a, b, next) {
  console.log("Calculating...");
  next(null, a + b);
};

server.method('sum', add, { cache: { expiresIn: 2000 } });

server.start(function() {
  server.methods.sum(4, 5, function (err, result) {
    console.log(result);

    // Force serial execution
    server.methods.sum(4, 5, function (err, result) {
      // Doesn't log "Calculating"
      console.log(result);
    });
  });

  // Run later
  setTimeout(function() {
    // Does not log "Calculating"
    server.methods.sum(4, 5, function (err, result) {
      console.log(result);
    });
  }, 1000);

  // Run after cache expires
  setTimeout(function() {
    // Logs "Calculating"
    server.methods.sum(4, 5, function (err, result) {
      console.log(result);
    });
  }, 3000);
});