Domain Stack Sample #5

domain_stack5.js

// domain stack sample
var fs = require('fs'), domain = require('domain');

// >> ClassA
function ClassA() {

}
ClassA.prototype.fnA = function(cb) {
  setTimeout(cb, 300);
  throw new Error('fnA');
};

// >> ClassB
function ClassB() {

}
ClassB.prototype.fnB = function(cb) {
  var dB = domain.create();
  dB.on('error', function(e) {
    console.log('This is DOMAIN 2.' + e.message);
  });
  dB.run(function() {
    setTimeout(cb, 500);
    throw new Error('fnB');
    dB.dispose();
  });
};

var d = domain.create();

d.on('error', function(e) {
  console.log('This is DOMAIN 1.' + e.message);
});

d.run(function() {
  var a = new ClassA();
  var b = new ClassB();
  a.fnA = d.bind(a.fnA);
  a.fnA(function() {
    // domain 1
    b.fnB(function() {
      // to be domain 2 but I won't.
      a.fnA(function() {

      });
    });
  });

});

result.txt

> node domain_stack5.js
This is DOMAIN 1.fnA
This is DOMAIN 2.fnB
This is DOMAIN 1.fnA