How can I piggyback request arguments from a web socket message without manually constructing array?

I've got an application scoped bean pushing json objects to a channel like this:

        <o:socket channel="controllerEventChannel" onmessage="function(message) {

                var controllerId = message.controllerId;
                var deviceId = message.deviceId;
                var companyKey = message.companyKey;

                onMessage([
                    { name: 'controllerId', value: controllerId },
                    { name: 'deviceId', value: deviceId },
                    { name: 'companyKey', value: companyKey }
                    ]);
        }"
        />

<p:remoteCommand name="onMessage" actionListener="#{controllerGroupDashboardBean.refreshListener()}"
                         update="MainForm:showList MainForm:equipmentView MainForm:mapEquipmentView"/>

But I'm tired of repeating myself and would much rather pass a json array to the channel which could be passed directly to the remote command like this:

        <o:socket channel="controllerEventChannel" onmessage="function(message) {
                onMessage(message);
        }"
        />

<p:remoteCommand name="onMessage" actionListener="#{controllerGroupDashboardBean.refreshListener()}"
                         update="MainForm:showList MainForm:equipmentView MainForm:mapEquipmentView"/>

However, this does not seem to work. I extract the parameters like this:

Map<String, String> params = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap();
        
String companyKey = params.get("companyKey");
String controllerId = params.get("controllerId");
String deviceId = params.get("deviceId");

Every parameter resolves to null and, weirdly, the map seems to contain the parameter "undefined" mapped to "" (i.e. blank string).

Anyone?

Solution

I'm using OmniFaces commandScript for that, without any problems.

Edit:

To get request parameters, use OmniFaces for neater code:

String myParam = Faces.getRequestParameter("myJsonField", String.class);

Edit2:

<!-- When browser receive notification, this commandScript will be called -->
    <h:form id="myCommandScriptForm">
        <o:commandScript name="onNotification" actionListener="#{myBean.onNotification}" render="@none" />
    </h:form>

And in socket something like this:

<o:socket channel="my-channel" onmessage="function(notificationEvent) {onNotification(notificationEvent);}" />

In MyBean something like:

Long entityId = Faces.getRequestParameter("entityId", Long.class);

If you wanna be fancy you can update from MyBean (notice i have render="@none" in XHTML, this is because i can conditionaly determine what to update in bean):

public void onNotification() {
    if (myList.contains(myEntity)) {
        PrimeFaces.current().ajax().update(":myWrapperJsfElement");
    }
}

OP ADDENDUM: o:commandScript was removed from OmniFaces after it was added in JSF 2.3.