webmiddle-service-resume v0.3.0

webmiddle-service-resume

A service that makes its children resumable by caching the result.

Install

npm install --save webmiddle-service-resume

Usage

import { PropTypes, rootContext } from 'webmiddle';
import Resume from 'webmiddle-service-resume';

const MyService = () => (
  <Resume savePath="./cache/resource1">
    <SubService
      name="resource1"
    />
  </Resume>
);

rootContext.evaluate(<MyService />)
.then(resource => {
  console.log(resource.name); // "resource1"
});

How it works

The children are internally wrapped with a Pipe service and executed. The resulting resource is then saved to the filesystem.

On subsequent executions, the service checks if the result is already stored in the filesystem, and if so it just returns such result.

Since the result is stored in the filesystem, it will last even among different executions of the application. This makes possible to resume work in case the application terminated abruptly and in other similar scenarios.

The save path is specified via the savePath attribute, which is relative to the outputBasePath context option.

Properties