What is buncha?

• IoC Container - Buncha is essential package to build a powerful, large application
• Invoke Function and Construct Object - Find the correct arguments automatically to invoke functions or construct an object from class.
• Dependency Manager - Manage dependencies of services in container. Auto detect dependency cycle.
• Annotation Scanner - Buncha uses @Service annotation to detect services in projects.
• Watch File Changes and Auto Reload - Hate restarting application to apply the changes every time modify a file? Buncha detects changes and reload it and all dependents for you automatically.
• Fast Execution - Buncha usually spends less than 0.02 milliseconds to parse and start invoking a function or constructing an object. See benchmark test

Install

$ npm install --save buncha

Register services manually

//Declare services
var userService = function () {
    //...
}
var ReportService = function (userService) {
    //...
}
//Register services. The registration order is NOT important
var container = new (require("buncha").Container)();
container.registerByConstructor("reportService", ReportService);
container.register("userService", userService);

//Get service by name
var reportService = container.resolve("reportService");
var services = container.resolve(["reportService", "userService"])

Invoke function and construct object

function generateReport (userService, reportService) {
    //...
}

function Report (reportService, userService, type){
    //...
}

//Buncha finds correct arguments to invoke the function
var report1 = container.invoke(generateReport);

//Add missingResolver {type:"pdf"}
//Missingresolver can be a function(parameterName){}
var report2 = container.construct(Report, {type:"pdf"});

Using service annotation to declare a service

Create file service/order-service.js with annotation @Service in multi-line comment block

/**
 * @Service(name="orderService")
 *
 */
module.exports = OrderService;
function OrderService (userService, reportService) {
    //...
}

Scan and watch

Use buncha to scan all services in service directory

var container = new (require("buncha").Container)();
var promise = container.scan( ["service"] );// .scan("service") is also OK.

We can also use .watch() to scan and watch all changes of services to auto reload them:

var container = new (require("buncha").Container)();
var promise = container.watch(["service"]);

Default services in IoC container:

• $construct
• $invoke
• $register
• $registerByConstructor
• $resolve
• $resolveByAnnotation

Function utility

function hello(name, age){
    //...
}
var User = function(name, age){
    this.getName = function(){
        return name;
    }
    this.getAge = function(){
        return age;
    }
}
var user = new User("Tom", 10);

var Fx = require("buncha").Fx;
var parameters = Fx.extractParameters( hello ); //return ["name", "age"]
var methods = Fx.getMethodNames( user ); //return ["getName", "getAge"]
var annotations = Fx.extractAnnotations( fileContentInString ); //return all annotations

Benchmark

On my machine, Buncha usually spends only more 0.00122 ms to 0.009347 ms to parse and invoke a function and 0.001195 ms to 0.020473 ms to construct an object.

Following is the result of my test:

Benchmark result of $invoke:
Wo Container: It takes 34ms to invoke 1000000 times.
W/ Container, Wo Caching: It takes 9381ms to invoke 1000000 times. Average time spent by Buncha: 0.009347ms
W/ Container, With Caching: It takes 1254ms to invoke 1000000 times. Average time spent by Buncha: 0.00122ms

Benchmark result of $construct:
Wo Container: It takes 38ms to construct 1000000 times.
W/ Container, Wo Caching: It takes 20511ms to construct 1000000 times. Average time spent by Buncha: 0.020473ms
W/ Container, With Caching: It takes 1233ms to construct 1000000 times. Average time spent by Buncha: 0.001195ms

Run the benchmark test:

$ mocha --grep "Benchmark"

Author

Tho Q Luong thoqbk.github.io

License

MIT