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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "mozilla/glean/bindings/GleanMetric.h"
#include "nsThreadUtils.h"
#include "nsWrapperCache.h"
#include "mozilla/AppShutdown.h"
#include "mozilla/ClearOnShutdown.h"
namespace mozilla::glean {
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(GleanMetric, mParent)
NS_IMPL_CYCLE_COLLECTING_ADDREF(GleanMetric)
NS_IMPL_CYCLE_COLLECTING_RELEASE(GleanMetric)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(GleanMetric)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
Maybe<SubmetricToMirrorMutex::AutoLock> GetLabeledMirrorLock() {
static SubmetricToMirrorMutex sLabeledMirrors("sLabeledMirrors");
auto lock = sLabeledMirrors.Lock();
// GIFFT will work up to the end of AppShutdownTelemetry.
if (AppShutdown::IsInOrBeyond(ShutdownPhase::XPCOMWillShutdown)) {
return Nothing();
}
if (!*lock) {
*lock = MakeUnique<SubmetricToLabeledMirrorMapType>();
RefPtr<nsIRunnable> cleanupFn = NS_NewRunnableFunction(__func__, [&] {
if (AppShutdown::IsInOrBeyond(ShutdownPhase::XPCOMWillShutdown)) {
auto lock = sLabeledMirrors.Lock();
*lock = nullptr; // deletes, see UniquePtr.h
return;
}
RunOnShutdown(
[&] {
auto lock = sLabeledMirrors.Lock();
*lock = nullptr; // deletes, see UniquePtr.h
},
ShutdownPhase::XPCOMWillShutdown);
});
// Both getting the main thread and dispatching to it can fail.
// In that event we leak. Grab a pointer so we have something to NS_RELEASE
// in that case.
nsIRunnable* temp = cleanupFn.get();
nsCOMPtr<nsIThread> mainThread;
if (NS_FAILED(NS_GetMainThread(getter_AddRefs(mainThread))) ||
NS_FAILED(mainThread->Dispatch(cleanupFn.forget(),
nsIThread::DISPATCH_NORMAL))) {
// Failed to dispatch cleanup routine.
// First, un-leak the runnable (but only if we actually attempted
// dispatch)
if (!cleanupFn) {
NS_RELEASE(temp);
}
// Next, cleanup immediately, and allow metrics to try again later.
*lock = nullptr;
return Nothing();
}
}
return Some(std::move(lock));
}
} // namespace mozilla::glean
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