gecko-dev/netwerk/wifi/nsWifiMonitor.cpp

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Geolocation.
*
* The Initial Developer of the Original Code is Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* This is a derivative of work done by Google under a BSD style License.
* See: http://gears.googlecode.com/svn/trunk/gears/geolocation/
*
* Contributor(s):
* Doug Turner <dougt@meer.net> (Original Author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsCOMPtr.h"
#include "nsComponentManagerUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsThreadUtils.h"
#include "nsXPCOM.h"
#include "nsXPCOMCID.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsWifiMonitor.h"
#include "nsWifiAccessPoint.h"
#include "nsServiceManagerUtils.h"
#include "nsComponentManagerUtils.h"
#include "mozilla/Services.h"
using namespace mozilla;
#if defined(PR_LOGGING)
PRLogModuleInfo *gWifiMonitorLog;
#endif
NS_IMPL_THREADSAFE_ISUPPORTS3(nsWifiMonitor,
nsIRunnable,
nsIObserver,
nsIWifiMonitor)
nsWifiMonitor::nsWifiMonitor()
: mKeepGoing(true)
, mReentrantMonitor("nsWifiMonitor.mReentrantMonitor")
{
#if defined(PR_LOGGING)
gWifiMonitorLog = PR_NewLogModule("WifiMonitor");
#endif
nsCOMPtr<nsIObserverService> obsSvc = mozilla::services::GetObserverService();
if (obsSvc)
obsSvc->AddObserver(this, "xpcom-shutdown", false);
LOG(("@@@@@ wifimonitor created\n"));
}
nsWifiMonitor::~nsWifiMonitor()
{
}
NS_IMETHODIMP
nsWifiMonitor::Observe(nsISupports *subject, const char *topic,
const PRUnichar *data)
{
if (!strcmp(topic, "xpcom-shutdown")) {
LOG(("Shutting down\n"));
mKeepGoing = false;
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
mon.Notify();
}
return NS_OK;
}
NS_IMETHODIMP nsWifiMonitor::StartWatching(nsIWifiListener *aListener)
{
if (!aListener)
return NS_ERROR_NULL_POINTER;
nsresult rv = NS_OK;
if (!mThread) {
rv = NS_NewThread(getter_AddRefs(mThread), this);
if (NS_FAILED(rv))
return rv;
}
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
mKeepGoing = true;
mListeners.AppendElement(nsWifiListener(aListener));
// tell ourselves that we have a new watcher.
mon.Notify();
return NS_OK;
}
NS_IMETHODIMP nsWifiMonitor::StopWatching(nsIWifiListener *aListener)
{
if (!aListener)
return NS_ERROR_NULL_POINTER;
LOG(("removing listener\n"));
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
for (PRUint32 i = 0; i < mListeners.Length(); i++) {
if (mListeners[i].mListener == aListener) {
mListeners.RemoveElementAt(i);
break;
}
}
if (mListeners.Length() == 0) {
mKeepGoing = false;
mon.Notify();
mThread = nsnull;
}
return NS_OK;
}
class nsPassErrorToWifiListeners : public nsIRunnable
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
nsPassErrorToWifiListeners(nsAutoPtr<nsCOMArray<nsIWifiListener> > aListeners,
nsresult aResult)
: mListeners(aListeners),
mResult(aResult)
{}
private:
nsAutoPtr<nsCOMArray<nsIWifiListener> > mListeners;
nsresult mResult;
};
NS_IMPL_THREADSAFE_ISUPPORTS1(nsPassErrorToWifiListeners,
nsIRunnable)
NS_IMETHODIMP nsPassErrorToWifiListeners::Run()
{
LOG(("About to send error to the wifi listeners\n"));
for (PRInt32 i = 0; i < mListeners->Count(); i++) {
(*mListeners)[i]->OnError(mResult);
}
return NS_OK;
}
NS_IMETHODIMP nsWifiMonitor::Run()
{
LOG(("@@@@@ wifi monitor run called\n"));
nsresult rv = DoScan();
if (mKeepGoing && NS_FAILED(rv)) {
nsAutoPtr<nsCOMArray<nsIWifiListener> > currentListeners(
new nsCOMArray<nsIWifiListener>(mListeners.Length()));
if (!currentListeners)
return NS_ERROR_OUT_OF_MEMORY;
for (PRUint32 i = 0; i < mListeners.Length(); i++)
currentListeners->AppendObject(mListeners[i].mListener);
nsCOMPtr<nsIThread> thread = do_GetMainThread();
if (!thread)
return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIRunnable> runnable(new nsPassErrorToWifiListeners(currentListeners, rv));
if (!runnable)
return NS_ERROR_OUT_OF_MEMORY;
thread->Dispatch(runnable, NS_DISPATCH_SYNC);
}
return NS_OK;
}
class nsCallWifiListeners : public nsIRunnable
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
nsCallWifiListeners(nsAutoPtr<nsCOMArray<nsIWifiListener> > aListeners,
nsAutoPtr<nsTArray<nsIWifiAccessPoint*> > aAccessPoints)
: mListeners(aListeners),
mAccessPoints(aAccessPoints)
{}
private:
nsAutoPtr<nsCOMArray<nsIWifiListener> > mListeners;
nsAutoPtr<nsTArray<nsIWifiAccessPoint*> > mAccessPoints;
};
NS_IMPL_THREADSAFE_ISUPPORTS1(nsCallWifiListeners,
nsIRunnable)
NS_IMETHODIMP nsCallWifiListeners::Run()
{
LOG(("About to send data to the wifi listeners\n"));
for (PRInt32 i = 0; i < mListeners->Count(); i++) {
(*mListeners)[i]->OnChange(mAccessPoints->Elements(), mAccessPoints->Length());
}
return NS_OK;
}
nsresult
nsWifiMonitor::CallWifiListeners(const nsCOMArray<nsWifiAccessPoint> &aAccessPoints,
bool aAccessPointsChanged)
{
nsAutoPtr<nsCOMArray<nsIWifiListener> > currentListeners(
new nsCOMArray<nsIWifiListener>(mListeners.Length()));
if (!currentListeners)
return NS_ERROR_OUT_OF_MEMORY;
{
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
for (PRUint32 i = 0; i < mListeners.Length(); i++) {
if (!mListeners[i].mHasSentData || aAccessPointsChanged) {
mListeners[i].mHasSentData = true;
currentListeners->AppendObject(mListeners[i].mListener);
}
}
}
if (currentListeners->Count() > 0)
{
PRUint32 resultCount = aAccessPoints.Count();
nsAutoPtr<nsTArray<nsIWifiAccessPoint*> > accessPoints(
new nsTArray<nsIWifiAccessPoint *>(resultCount));
if (!accessPoints)
return NS_ERROR_OUT_OF_MEMORY;
for (PRUint32 i = 0; i < resultCount; i++)
accessPoints->AppendElement(aAccessPoints[i]);
nsCOMPtr<nsIThread> thread = do_GetMainThread();
if (!thread)
return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIRunnable> runnable(
new nsCallWifiListeners(currentListeners, accessPoints));
if (!runnable)
return NS_ERROR_OUT_OF_MEMORY;
thread->Dispatch(runnable, NS_DISPATCH_SYNC);
}
return NS_OK;
}