How to use the rhea.filter function in rhea

* Copyright 2015 Red Hat Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
var container = require('rhea');
var filters = require('rhea').filter;

var args = require('../options.js').options({
    's': { alias: 'selector', default: "colour = 'red'", describe: 'the selector string to use'},
    'm': { alias: 'messages', default: 100, describe: 'number of messages to expect'},
    'n': { alias: 'node', default: 'examples', describe: 'name of node (e.g. queue or topic) from which messages are received'},
    'h': { alias: 'host', default: 'localhost', describe: 'dns or ip name of server where you want to connect'},
    'p': { alias: 'port', default: 5672, describe: 'port to connect to'}
}).help('help').argv;

var received = 0;
var expected = args.messages;

container.on('message', function (context) {
    if (context.message.properties && context.message.properties.id && context.message.properties.id < received) {
        // ignore duplicate message
        return;