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/*
* A simple example showing piping event traces to a 'events.log' file.
*
* Usage:
* $ node event-log.js
* hi
* bye
* $ cat events.log
* [{"ts":213699797444,"pid":42628,"tid":42628,"ph":"b","cat":"default","args":{},"name":"doSomething","id":"abc"},
* {"ts":213700798563,"pid":42628,"tid":42628,"ph":"e","cat":"default","args":{},"name":"doSomething","id":"abc"},
*/
var fs = require("fs");
var evt = new (require("../dist/trace-event")).Tracer();
evt.pipe(fs.createWriteStream("events.log"));
console.log('Streaming events to "events.log"');
// Instrument code with evt.{begin|instant|end} calls.
function doSomething(cb) {
evt.begin({ name: "doSomething", id: "abc" });
// Takes 1s to do all this processing for "something".
setTimeout(function() {
evt.end({ name: "doSomething", id: "abc" });
cb();
}, 1000);
}
console.log("hi");
doSomething(function() {
console.log("bye");
});