hapijs/hapi

  function sleep(ms) {
    return new Promise((resolve) => {
      setTimeout(resolve, ms);
    });
  }

  const querySchemaMetadata = async () => {
    console.log(`regenerating cache ${(new Date()).toLocaleTimeString()}`);
    await sleep(9000);
    return Promise.resolve([{id: `${(new Date()).getMilliseconds()}`}]);
  };
  server.method('querySchemaMetadata', querySchemaMetadata, {
    cache: {
      expiresIn: 60 * 60 * 1000,  // 1hr
      /**
       * provides a 15 second timeout querySchemaMetadata to return. Otherwise, returns a timeout error
       */
      generateTimeout: false,
      //generateTimeout: 15 * 1000,
      /**
       * returns a wrapped object of the value that includes additional stats metadata
       */
      getDecoratedValue: true,
      /**
       * allow multiple simultaneous access requests to this cache item to be queued for up to a duration of
       * 10 seconds before a separate access request is allowed.
       */
      pendingGenerateTimeout: 2000,
    }
  });

  server.route({
    path: '/route1',
    method: 'GET',
    handler: async function (request, h) {
      await server.methods.querySchemaMetadata()
    }
  });

  server.route({
    path: '/route2',
    method: 'GET',
    handler: async function (request, h) {
      await server.methods.querySchemaMetadata();
    }
  });