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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "DiskSpaceWatcher.h"
#include "nsIObserverService.h"
#include "nsXULAppAPI.h"
#include "mozilla/Hal.h"
#include "mozilla/ModuleUtils.h"
#include "mozilla/Preferences.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Services.h"
#define NS_DISKSPACEWATCHER_CID \
{ 0xab218518, 0xf197, 0x4fb4, { 0x8b, 0x0f, 0x8b, 0xb3, 0x4d, 0xf2, 0x4b, 0xf4 } }
using namespace mozilla;
StaticRefPtr<DiskSpaceWatcher> gDiskSpaceWatcher;
NS_IMPL_ISUPPORTS(DiskSpaceWatcher, nsIDiskSpaceWatcher, nsIObserver)
uint64_t DiskSpaceWatcher::sFreeSpace = 0;
bool DiskSpaceWatcher::sIsDiskFull = false;
DiskSpaceWatcher::DiskSpaceWatcher()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!gDiskSpaceWatcher);
}
DiskSpaceWatcher::~DiskSpaceWatcher()
{
MOZ_ASSERT(!gDiskSpaceWatcher);
}
already_AddRefed<DiskSpaceWatcher>
DiskSpaceWatcher::FactoryCreate()
{
if (!XRE_IsParentProcess()) {
return nullptr;
}
MOZ_ASSERT(NS_IsMainThread());
if (!Preferences::GetBool("disk_space_watcher.enabled", false)) {
return nullptr;
}
if (!gDiskSpaceWatcher) {
gDiskSpaceWatcher = new DiskSpaceWatcher();
ClearOnShutdown(&gDiskSpaceWatcher);
}
RefPtr<DiskSpaceWatcher> service = gDiskSpaceWatcher.get();
return service.forget();
}
NS_IMETHODIMP
DiskSpaceWatcher::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData)
{
MOZ_ASSERT(NS_IsMainThread());
if (!strcmp(aTopic, "profile-after-change")) {
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
observerService->AddObserver(this, "profile-before-change", false);
mozilla::hal::StartDiskSpaceWatcher();
return NS_OK;
}
if (!strcmp(aTopic, "profile-before-change")) {
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
observerService->RemoveObserver(this, "profile-before-change");
mozilla::hal::StopDiskSpaceWatcher();
return NS_OK;
}
MOZ_ASSERT(false, "DiskSpaceWatcher got unexpected topic!");
return NS_ERROR_UNEXPECTED;
}
NS_IMETHODIMP DiskSpaceWatcher::GetIsDiskFull(bool* aIsDiskFull)
{
*aIsDiskFull = sIsDiskFull;
return NS_OK;
}
// GetFreeSpace is a macro on windows, and that messes up with the c++
// compiler.
#ifdef XP_WIN
#undef GetFreeSpace
#endif
NS_IMETHODIMP DiskSpaceWatcher::GetFreeSpace(uint64_t* aFreeSpace)
{
*aFreeSpace = sFreeSpace;
return NS_OK;
}
// static
void DiskSpaceWatcher::UpdateState(bool aIsDiskFull, uint64_t aFreeSpace)
{
MOZ_ASSERT(NS_IsMainThread());
if (!gDiskSpaceWatcher) {
return;
}
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
sIsDiskFull = aIsDiskFull;
sFreeSpace = aFreeSpace;
if (!observerService) {
return;
}
const char16_t stateFull[] = { 'f', 'u', 'l', 'l', 0 };
const char16_t stateFree[] = { 'f', 'r', 'e', 'e', 0 };
nsCOMPtr<nsISupports> subject;
CallQueryInterface(gDiskSpaceWatcher.get(), getter_AddRefs(subject));
MOZ_ASSERT(subject);
observerService->NotifyObservers(subject,
DISKSPACEWATCHER_OBSERVER_TOPIC,
sIsDiskFull ? stateFull : stateFree);
return;
}
NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(DiskSpaceWatcher,
DiskSpaceWatcher::FactoryCreate)
NS_DEFINE_NAMED_CID(NS_DISKSPACEWATCHER_CID);
static const mozilla::Module::CIDEntry kDiskSpaceWatcherCIDs[] = {
{ &kNS_DISKSPACEWATCHER_CID, false, nullptr, DiskSpaceWatcherConstructor },
{ nullptr }
};
static const mozilla::Module::ContractIDEntry kDiskSpaceWatcherContracts[] = {
{ "@mozilla.org/toolkit/disk-space-watcher;1", &kNS_DISKSPACEWATCHER_CID },
{ nullptr }
};
static const mozilla::Module::CategoryEntry kDiskSpaceWatcherCategories[] = {
#ifdef MOZ_WIDGET_GONK
{ "profile-after-change", "Disk Space Watcher Service", DISKSPACEWATCHER_CONTRACTID },
#endif
{ nullptr }
};
static const mozilla::Module kDiskSpaceWatcherModule = {
mozilla::Module::kVersion,
kDiskSpaceWatcherCIDs,
kDiskSpaceWatcherContracts,
kDiskSpaceWatcherCategories
};
NSMODULE_DEFN(DiskSpaceWatcherModule) = &kDiskSpaceWatcherModule;
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