Requirements

• Wirecloud 0.6.0
• A PubSub server (https://github.com/conwetlab/silbops)

Installation

You can get wirecloud-pubsub from PyPI with...

# pip install wirecloud-pubsub

Since wirecloud_pubsub uses django.contrib.static functionalities, you should add it to your INSTALLED_APPS in settings.py:

INSTALLED_APPS = (
    ...
    'wirecloud_pubsub',
    ...
)

As last step, add a DEFAULT_SILBOPS_BROKER setting with the URL of the broker to use:

DEFAULT_SILBOPS_BROKER = 'http://pubsub.server.com:8080/silbops/CometAPI'

Don't forget to run the collectstatic and compress commands on your Wirecloud installation:

$ ./manage.py collectstatic
$ ./manage.py compress

Usage

Once wirecloud-pubsub is installed and activated, widgets and operators can take advantage the PubSub functionallities through the MashupPlatform.SilboPS object. Currently, the MashupPlatform.SilboPS object only exports the PubEndPoint, SubEndPoint and Filter classes defined by the original javascript bindings provided by SilboPS. Full documentation of SilboPS is available at https://github.com/conwetlab/silbops.

Examples

Publishing

var endpoint;

function publish() {
    var notification = new MashupPlatform.SilboPS.Notification()
        .attribute("value", SilboPS.Type.LONG, Math.floor((Math.random() * 100) + 1))
        .attribute("fqn", SilboPS.Type.STRING, "es.upm.fi.machine1")
        .attribute("eventType", SilboPS.Type.STRING, "monitoring.cpu");
}

function start_publishing() {
    var advertise = new MashupPlatform.SilboPS.Advertise()
        .attribute("value", SilboPS.Type.LONG)
        .attribute("fqn", SilboPS.Type.STRING)
        .attribute("eventType", SilboPS.Type.STRING);

    endpoint.advertise(advertise);
    setInterval(publish, 2000);
}

endpoint = new MashupPlatform.SilboPS.PubEndPoint({
    open: function(endpoint) {
        alert('Endpoint ready');
        start_publishing();
    },
    close: function(endpoint) {
        alert('Endpoint closed');
    }
});

Subscribing

var endpoint, filter;

function create_subscription() {
    var cxtFunc = new SilboPS.ContextFunction();
    var subscription = new SilboPS.Subscription()
        .constrain("fqn", SilboPS.Type.STRING).startsWith("es.upm.fi.")
        .constrain("eventType", SilboPS.Type.STRING).eq("es.upm.fi.")
        .subscription();

        endpoint.subscribe(subscription, cxtFunc);
};

endpoint = new MashupPlatform.SilboPS.SubEndPoint({
    open: function (endpoint) {
        endpoint.subscribe(filter);
        alert('Endpoint ready');
    },
    close: function (endpoint) {
        alert('Endpoint closed');
    },
    notify: function (endpoint, data) {
        var notification = data.notification;
        alert(notification.value);
    }
});