metadata-manager.js
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metadata-manager.js
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	var Promise = require("bluebird");

	var MetadataManager = new function(){

	var that = this;

	this.get_value = function(key, dispatcher){
	return new Promise(function(resolve, reject){
	dispatcher.datastore.find("meta", { "key": key }, {}).then(function(response){
	if(response.length==0){
	resolve(undefined);
	}else{
	resolve(response[0].value);
	}
	});
	})
	}

	this.has_key = function(key, dispatcher){
	return new Promise(function(resolve, reject){
	dispatcher.datastore.find("meta", { key: key }, {}).then(function(response){
	if(response.length===0){
	resolve(false);
	}else{
	resolve(true);
	}
	});
	});
	}

	this.set_value = function(key, value, dispatcher){
	return new Promise(function(resolve, reject){
	that.has_key(key, dispatcher).then(function(has){
	function actual_set(){
	dispatcher.datastore.update("meta", { key: key }, {key:key, value: value}).then(function(response){
	if(response.length==0){
	resolve(false);
	}else{
	resolve(true);
	}
	});
	}
	if(!has){
	dispatcher.datastore.insert("meta", {key: key, value: value}, {}).then(function(data){
	actual_set();
	})
	}else{
	actual_set();
	}
	})
	})
	}

	this.increment_variable = function(key, dispatcher){
	return new Promise(function(resolve, reject){
	that.get_value(key, dispatcher).then(function(data){
	if(isNaN(data)){
	var new_id=0;
	}else{
	var new_id = data+1;
	}
	that.set_value(key, new_id, dispatcher).then(function(dataL){
	resolve(new_id);
	});
	});
	})
	}
	}

	module.exports = MetadataManager;