Domain Stack Sample #4

domain_stack4.js

// domain stack sample #3
var domain = require('domain');
var d1 = domain.create();
var d2 = domain.create();
var d3 = domain.create();

d1.on('error', function(err) {
  console.log('d1:', err.message);
});
d2.on('error', function(err) {
  console.log('d2:', err.message);
});
d3.on('error', function(err) {
  console.log('d3:', err.message);
});

var arg = +process.argv[2];
var a = null;

d1.enter();
if(arg === 1) {
  a.hoge;
}

d2.enter();
if (arg == 2) {
  a.hoge;
}

d3.enter();
if (arg == 3) {
  a.hoge;
}

result.txt

> node domain_stack4.js 1
d1: Cannot read property 'hoge' of null
> node domain_stack4.js 2
d2: Cannot read property 'hoge' of null
> node domain_stack4.js 3
d3: Cannot read property 'hoge' of null