Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 217 insertions, 0 deletions

diff --git a/toolkit/components/places/Shutdown.cpp b/toolkit/components/places/Shutdown.cpp
new file mode 100644
index 0000000000..8327784b86
--- /dev/null
+++ b/toolkit/components/places/Shutdown.cpp
@@ -0,0 +1,217 @@
+/* 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 "Shutdown.h"
+#include "mozilla/Unused.h"
+#include "mozilla/Services.h"
+#include "mozilla/SimpleEnumerator.h"
+#include "nsComponentManagerUtils.h"
+#include "nsIProperty.h"
+#include "nsIObserverService.h"
+#include "nsIWritablePropertyBag.h"
+#include "nsVariant.h"
+#include "Database.h"
+
+namespace mozilla {
+namespace places {
+
+uint16_t PlacesShutdownBlocker::sCounter = 0;
+Atomic<bool> PlacesShutdownBlocker::sIsStarted(false);
+
+PlacesShutdownBlocker::PlacesShutdownBlocker(const nsString& aName)
+    : mName(aName), mState(NOT_STARTED), mCounter(sCounter++) {
+  MOZ_ASSERT(NS_IsMainThread());
+  // During tests, we can end up with the Database singleton being resurrected.
+  // Make sure that each instance of DatabaseShutdown has a unique name.
+  if (mCounter > 1) {
+    mName.AppendInt(mCounter);
+  }
+  // Create a barrier that will be exposed to clients through GetClient(), so
+  // they can block Places shutdown.
+  nsCOMPtr<nsIAsyncShutdownService> asyncShutdown =
+      services::GetAsyncShutdownService();
+  MOZ_ASSERT(asyncShutdown);
+  if (asyncShutdown) {
+    nsCOMPtr<nsIAsyncShutdownBarrier> barrier;
+    nsresult rv = asyncShutdown->MakeBarrier(mName, getter_AddRefs(barrier));
+    MOZ_ALWAYS_SUCCEEDS(rv);
+    if (NS_SUCCEEDED(rv) && barrier) {
+      mBarrier = new nsMainThreadPtrHolder<nsIAsyncShutdownBarrier>(
+          "PlacesShutdownBlocker::mBarrier", barrier);
+    }
+  }
+}
+
+// nsIAsyncShutdownBlocker
+NS_IMETHODIMP
+PlacesShutdownBlocker::GetName(nsAString& aName) {
+  aName = mName;
+  return NS_OK;
+}
+
+// nsIAsyncShutdownBlocker
+NS_IMETHODIMP
+PlacesShutdownBlocker::GetState(nsIPropertyBag** _state) {
+  NS_ENSURE_ARG_POINTER(_state);
+
+  nsCOMPtr<nsIWritablePropertyBag> bag =
+      do_CreateInstance("@mozilla.org/hash-property-bag;1");
+  NS_ENSURE_TRUE(bag, NS_ERROR_OUT_OF_MEMORY);
+
+  RefPtr<nsVariant> progress = new nsVariant();
+  Unused << NS_WARN_IF(NS_FAILED(progress->SetAsUint8(mState)));
+  Unused << NS_WARN_IF(
+      NS_FAILED(bag->SetProperty(u"PlacesShutdownProgress"_ns, progress)));
+
+  if (mBarrier) {
+    nsCOMPtr<nsIPropertyBag> barrierState;
+    if (NS_SUCCEEDED(mBarrier->GetState(getter_AddRefs(barrierState))) &&
+        barrierState) {
+      nsCOMPtr<nsISimpleEnumerator> enumerator;
+      if (NS_SUCCEEDED(
+              barrierState->GetEnumerator(getter_AddRefs(enumerator))) &&
+          enumerator) {
+        for (const auto& property : SimpleEnumerator<nsIProperty>(enumerator)) {
+          nsAutoString prefix(u"Barrier: "_ns);
+          nsAutoString name;
+          Unused << NS_WARN_IF(NS_FAILED(property->GetName(name)));
+          prefix.Append(name);
+          nsCOMPtr<nsIVariant> value;
+          Unused << NS_WARN_IF(
+              NS_FAILED(property->GetValue(getter_AddRefs(value))));
+          Unused << NS_WARN_IF(NS_FAILED(bag->SetProperty(prefix, value)));
+        }
+      }
+    }
+  }
+  bag.forget(_state);
+  return NS_OK;
+}
+
+already_AddRefed<nsIAsyncShutdownClient> PlacesShutdownBlocker::GetClient() {
+  nsCOMPtr<nsIAsyncShutdownClient> client;
+  if (mBarrier) {
+    MOZ_ALWAYS_SUCCEEDS(mBarrier->GetClient(getter_AddRefs(client)));
+  }
+  return client.forget();
+}
+
+// nsIAsyncShutdownBlocker
+NS_IMETHODIMP
+PlacesShutdownBlocker::BlockShutdown(nsIAsyncShutdownClient* aParentClient) {
+  MOZ_ASSERT(NS_IsMainThread());
+  mParentClient = new nsMainThreadPtrHolder<nsIAsyncShutdownClient>(
+      "ClientsShutdownBlocker::mParentClient", aParentClient);
+  mState = RECEIVED_BLOCK_SHUTDOWN;
+
+  if (NS_WARN_IF(!mBarrier)) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  // Wait until all the clients have removed their blockers.
+  MOZ_ALWAYS_SUCCEEDS(mBarrier->Wait(this));
+
+  mState = CALLED_WAIT_CLIENTS;
+  return NS_OK;
+}
+
+// nsIAsyncShutdownCompletionCallback
+NS_IMETHODIMP
+PlacesShutdownBlocker::Done() {
+  MOZ_ASSERT(false, "Should always be overridden");
+  return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(PlacesShutdownBlocker, nsIAsyncShutdownBlocker,
+                  nsIAsyncShutdownCompletionCallback)
+
+////////////////////////////////////////////////////////////////////////////////
+
+ClientsShutdownBlocker::ClientsShutdownBlocker()
+    : PlacesShutdownBlocker(u"Places Clients shutdown"_ns) {
+  // Do nothing.
+}
+
+// nsIAsyncShutdownCompletionCallback
+NS_IMETHODIMP
+ClientsShutdownBlocker::Done() {
+  // At this point all the clients are done, we can stop blocking the shutdown
+  // phase.
+  mState = RECEIVED_DONE;
+
+  // mParentClient is nullptr in tests.
+  if (mParentClient) {
+    nsresult rv = mParentClient->RemoveBlocker(this);
+    if (NS_WARN_IF(NS_FAILED(rv))) return rv;
+    mParentClient = nullptr;
+  }
+  mBarrier = nullptr;
+  return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+ConnectionShutdownBlocker::ConnectionShutdownBlocker(Database* aDatabase)
+    : PlacesShutdownBlocker(u"Places Connection shutdown"_ns),
+      mDatabase(aDatabase) {
+  // Do nothing.
+}
+
+// nsIAsyncShutdownCompletionCallback
+NS_IMETHODIMP
+ConnectionShutdownBlocker::Done() {
+  // At this point all the clients are done, we can stop blocking the shutdown
+  // phase.
+  mState = RECEIVED_DONE;
+
+  // Annotate that Database shutdown started.
+  sIsStarted = true;
+
+  // At this stage, any use of this database is forbidden. Get rid of
+  // `gDatabase`. Note, however, that the database could be
+  // resurrected.  This can happen in particular during tests.
+  MOZ_ASSERT(Database::gDatabase == nullptr ||
+             Database::gDatabase == mDatabase);
+  Database::gDatabase = nullptr;
+
+  // Database::Shutdown will invoke Complete once the connection is closed.
+  mDatabase->Shutdown();
+  mState = CALLED_STORAGESHUTDOWN;
+  mBarrier = nullptr;
+  return NS_OK;
+}
+
+// mozIStorageCompletionCallback
+NS_IMETHODIMP
+ConnectionShutdownBlocker::Complete(nsresult, nsISupports*) {
+  MOZ_ASSERT(NS_IsMainThread());
+  mState = RECEIVED_STORAGESHUTDOWN_COMPLETE;
+
+  // The connection is closed, the Database has no more use, so we can break
+  // possible cycles.
+  mDatabase = nullptr;
+
+  // Notify the connection has gone.
+  nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+  MOZ_ASSERT(os);
+  if (os) {
+    MOZ_ALWAYS_SUCCEEDS(
+        os->NotifyObservers(nullptr, TOPIC_PLACES_CONNECTION_CLOSED, nullptr));
+  }
+  mState = NOTIFIED_OBSERVERS_PLACES_CONNECTION_CLOSED;
+
+  // mParentClient is nullptr in tests
+  if (mParentClient) {
+    nsresult rv = mParentClient->RemoveBlocker(this);
+    if (NS_WARN_IF(NS_FAILED(rv))) return rv;
+    mParentClient = nullptr;
+  }
+  return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS_INHERITED(ConnectionShutdownBlocker, PlacesShutdownBlocker,
+                            mozIStorageCompletionCallback)
+
+}  // namespace places
+}  // namespace mozilla