This document discusses Firefox OS and its use of e10s (electrolysis) architecture. It covers the process model used in Firefox OS including the b2g process, plugin container process, and hardware access. It also summarizes the Inter-Process Communication (IPC) mechanisms like IPDL, network APIs like XMLHttpRequest and WebSockets, as well as inter-app communication capabilities in Firefox OS like Web Activities and direct app connections.

1. e10s
@makoto_kato

2. about:me
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3. •Rust Samurai #4-https://atnd.org/events/54657

4. Agenda
•Electrolysis (e10s) ?
•Firefox OS

5. •Firefox / Gecko

6. e10s
•FirefoxOut-Of-Process Plugin
•Firefox 3.6
•FirefoxDRM/CDM(Content Decryption Module)
•Firefox 3x?
•FirefoxChromeContent
•(Nightly)
•Firefox OS

7. Firefox OS
•b2g
•plugin-container
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•APIb2g

8. Kernel / Gonk
b2g process
Plugin- container
process
(Apps)
Plugin- container process
(Apps)
Hardware Access
IPC
IPC

9. (IPC)
•ChromiumIPC
•IPCIPDL
•IDL

10. IPDL
•IDL
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•IPDL
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11. ipdl
hal/sandbox/PHal.idl
sync protocol PHal{
…
child:
NotifyBatteryChange(
BatteryInformationaBatteryInfo);
…
parent:
Vibrate(uint32_t[] pattern, uint64_t[] id,
PBrowserbrowser);
}

12. ()
@OBJDIR@/ipc/ipdl/_ipdlheaders/mozilla/hal_sandbox/PHal.h
class Msg_NotifyBatteryChange:
public IPC::Message
…
}

13. ()
@OBJDIR@/ipc/ipdl/_ipdlheaders/mozilla/hal_sandbox/PHalChild.h
class /*NS_ABSTRACT_CLASS*/ PHalParent:
public mozilla::ipc::IProtocol,
protected mozilla::ipc::IProtocolManager<mozilla::ipc::IProtocol>
{
…
virtual bool
RecvVibrate(
constnsTArray<uint32_t>& pattern,
constnsTArray<uint64_t>& id,
PBrowserParent* browser) = 0;
…
bool
SendNotifyBatteryChange(constBatteryInformation& aBatteryInfo) NS_WARN_UNUSED_RESULT;

14. ()
@OBJDIR@/ipc/ipdl/_ipdlheaders/mozilla/hal_sandbox/PHalChild.h
class /*NS_ABSTRACT_CLASS*/ PHalChild:
public mozilla::ipc::IProtocol,
protected mozilla::ipc::IProtocolManager<mozilla::ipc::IProtocol>
{
…
virtual bool
RecvNotifyBatteryChange(constBatteryInformation& aBatteryInfo) = 0;
…
bool
SendVibrate(
constnsTArray<uint32_t>& pattern,
constnsTArray<uint64_t>& id,
PBrowserChild* browser);

15. template<>
structParamTraits<mozilla::WidgetGUIEvent>
{
typedefmozilla::WidgetGUIEventparamType;
static void Write(Message* aMsg, constparamType& aParam)
{
WriteParam(aMsg, static_cast<mozilla::WidgetEvent>(aParam));
WriteParam(aMsg, aParam.mPluginEvent.mBuffer);
}
static boolRead(constMessage* aMsg, void** aIter,
paramType* aResult)
{
return ReadParam(aMsg, aIter,
static_cast<mozilla::WidgetEvent*>(aResult)) &&
ReadParam(aMsg, aIter, &aResult->mPluginEvent.mBuffer);
}

16. IPC
•B2g(Chrome) (Content)
•b2g

17. •XMLHttpRequsest
•WebSocket
•Socket (TCP/UDP)
•Web Activity
•Inter App Communication

18. XMLHttpRequest/ WebSocket
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19. XMLHttpRequest/ WebSocket
•
•HTTP
•Firefox OSDaemon ProcessDaemon Process
•DRM
•LocalhostNetwork Activity

20. Socket API
•TCP or UDP Socket
•
•

21. TCPSocket ()
varsocket = new navigator.mozTCPSocket.open(
‘127.0.0.1’, 8888, { binaryType: ‘string’ } );
socket.onopen= function() {
};
socket.ondata= function(msg) {
//
};
…
socket.send(‘hello’);

22. TCP Server Socket
varsocket = navigator.mozTCPSocket.listen(8888, { binaryType: ‘string’ });
Socket.onconnect= function() {
//
}
…

23. UDP Socket
varsocket = new UDPSocket();
socket.addEventListener(‘message’, function() {
//
})
socket.send(‘hello’, ‘127.0.0.1’, 8888);

24. Web Activity
•Web IntentAPI (Google Chrome) Firefox OSCounter Proposal

25. “Web Activities' intent is not to be a clone of Google's Web Intents with some naming and API details changed. Web Activities aim to be a simple API trying to solve a very clear set of use cases.” http://lists.w3.org/Archives/Public/public-web- intents/2012Jun/0061.html

26. •MozActivity

27. varactivity = new MozActivity( {
name: “pick”,
data: {
type: “image/jpeg”
}
});
activity.onsuccess= function() {
// this.result
}

28. •
•
•

29. {
“name”: ‘<Application Name>’,
“description”: ‘<Application’s description>’,
“activities”: {
“view” : {
“filters”: {
“type” : “image/tiff”
}
}
}
}

30. varregister = navigator.mozRegisterActivityHandler({
name: “view”,
disposition: “inline”,
filters: {
type: “image/tiff”;
}
}

31. navigator.mozSetMessageHandler(‘activity’, function(request) {
//
request.postRequest(…);
}

32. Web Activity
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•1:n
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33. Inter-App Communication (IAC)
•Firefox OS 1.2+
•Certified App only
•Web Activity
•
•–Publisher
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•-Subscriber

34. “connections” {
“<keyword>” : {
“handler_path”: “/index.html”,
“description”: “description”,
“rules” : {
“manifestURLs”: “<url>”,
…
}
}
}

35. navigator.mozApps.getSelf().onsuccess= function(ev) {
varapp = ev.target.result;
app.connet(‘<keyword>’, rules).then(function(ports) {
// connected
ports.forEach(function(port) {
port.onmessage= function(evt) {
// received data
});
port.postMessage({ value: ‘hello’ });
}
}, function(reason) {
// reject
});
};

36. navigator.mozSetMessageHandler(‘connection’,
function(request) {
varkeyword = request.keyword;
varport = request.port;
port.onmessage= function(evt) {
varmessage = evt.data;
port.postMessage({ value: “Hello” });
}
});

37. Inter App Communication
•Certified App
•Certified
•1:1

38. •e10sGecko
•Gecko
•Firefox OS(Web Activity / Inter- App Communication) e10s
•APINetwork Activity
•Gecko
•XMLHttpRequest/ WebSocket/ Socket API

39. References
•mozTCPSocket
•https://developer.mozilla.org/en- US/docs/Web/API/Navigator.mozTCPSocket
•WebActivities
•https://developer.mozilla.org/en- US/docs/Web/API/Web_Activities
•Inter App Communication
•https://wiki.mozilla.org/WebAPI/Inter_App_Communication
•https://bugzilla.mozilla.org/show_bug.cgi?id=907068