// Copyright (c) 2014, StrongLoop Inc.

//

// Permission to use, copy, modify, and/or distribute this software for any

// purpose with or without fee is hereby granted, provided that the above

// copyright notice and this permission notice appear in all copies.

//

// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

'use strict';

var EventEmitter = require('events');

var v8binding = process.binding('v8');

var v8 = module.exports = new EventEmitter();

v8.getHeapStatistics = v8binding.getHeapStatistics;

v8.setFlagsFromString = v8binding.setFlagsFromString;

function emitGC(before, after) {

v8.emit('gc', before, after);

}

v8.on('newListener', function(name) {

if (name === 'gc' && EventEmitter.listenerCount(this, name) === 0) {

v8binding.startGarbageCollectionTracking(emitGC);

}

});

v8.on('removeListener', function(name) {

if (name === 'gc' && EventEmitter.listenerCount(this, name) === 0) {

v8binding.stopGarbageCollectionTracking();

}

});