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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
+ * 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/. */
+
+#ifndef MOZSTORAGESERVICE_H
+#define MOZSTORAGESERVICE_H
+
+#include "nsCOMPtr.h"
+#include "nsIFile.h"
+#include "nsIMemoryReporter.h"
+#include "nsIObserver.h"
+#include "nsTArray.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/intl/Collator.h"
+
+#include "mozIStorageService.h"
+
+class nsIMemoryReporter;
+struct sqlite3_vfs;
+namespace mozilla::intl {
+class Collator;
+}
+
+namespace mozilla {
+namespace storage {
+
+class Connection;
+class Service : public mozIStorageService,
+ public nsIObserver,
+ public nsIMemoryReporter {
+ public:
+ /**
+ * Initializes the service. This must be called before any other function!
+ */
+ nsresult initialize();
+
+ /**
+ * Compares two strings using the Service's locale-aware collation.
+ *
+ * @param aStr1
+ * The string to be compared against aStr2.
+ * @param aStr2
+ * The string to be compared against aStr1.
+ * @param aSensitivity
+ * The sorting sensitivity.
+ * @return aStr1 - aStr2. That is, if aStr1 < aStr2, returns a negative
+ * number. If aStr1 > aStr2, returns a positive number. If
+ * aStr1 == aStr2, returns 0.
+ */
+ int localeCompareStrings(const nsAString& aStr1, const nsAString& aStr2,
+ mozilla::intl::Collator::Sensitivity aSensitivity);
+
+ static already_AddRefed<Service> getSingleton();
+
+ NS_DECL_THREADSAFE_ISUPPORTS
+ NS_DECL_MOZISTORAGESERVICE
+ NS_DECL_NSIOBSERVER
+ NS_DECL_NSIMEMORYREPORTER
+
+ /**
+ * Returns a boolean value indicating whether or not the given page size is
+ * valid (currently understood as a power of 2 between 512 and 65536).
+ */
+ static bool pageSizeIsValid(int32_t aPageSize) {
+ return aPageSize == 512 || aPageSize == 1024 || aPageSize == 2048 ||
+ aPageSize == 4096 || aPageSize == 8192 || aPageSize == 16384 ||
+ aPageSize == 32768 || aPageSize == 65536;
+ }
+
+ static const int32_t kDefaultPageSize = 32768;
+
+ /**
+ * Registers the connection with the storage service. Connections are
+ * registered so they can be iterated over.
+ *
+ * @pre mRegistrationMutex is not held
+ *
+ * @param aConnection
+ * The connection to register.
+ */
+ void registerConnection(Connection* aConnection);
+
+ /**
+ * Unregisters the connection with the storage service.
+ *
+ * @pre mRegistrationMutex is not held
+ *
+ * @param aConnection
+ * The connection to unregister.
+ */
+ void unregisterConnection(Connection* aConnection);
+
+ /**
+ * Gets the list of open connections. Note that you must test each
+ * connection with mozIStorageConnection::connectionReady before doing
+ * anything with it, and skip it if it's not ready.
+ *
+ * @pre mRegistrationMutex is not held
+ *
+ * @param aConnections
+ * An inout param; it is cleared and the connections are appended to
+ * it.
+ * @return The open connections.
+ */
+ void getConnections(nsTArray<RefPtr<Connection> >& aConnections);
+
+ private:
+ Service();
+ virtual ~Service();
+
+ /**
+ * Used for 1) locking around calls when initializing connections so that we
+ * can ensure that the state of sqlite3_enable_shared_cache is sane and 2)
+ * synchronizing access to mLocaleCollation.
+ */
+ Mutex mMutex MOZ_UNANNOTATED;
+
+ struct AutoVFSRegistration {
+ int Init(UniquePtr<sqlite3_vfs> aVFS);
+ ~AutoVFSRegistration();
+
+ private:
+ UniquePtr<sqlite3_vfs> mVFS;
+ };
+
+ // The order of these members should match the order of Init calls in
+ // initialize(), to ensure that the unregistration takes place in the reverse
+ // order.
+ AutoVFSRegistration mBaseSqliteVFS;
+ AutoVFSRegistration mBaseExclSqliteVFS;
+ AutoVFSRegistration mQuotaSqliteVFS;
+ AutoVFSRegistration mObfuscatingSqliteVFS;
+ AutoVFSRegistration mReadOnlyNoLockSqliteVFS;
+
+ /**
+ * Protects mConnections.
+ */
+ Mutex mRegistrationMutex MOZ_UNANNOTATED;
+
+ /**
+ * The list of connections we have created. Modifications to it are
+ * protected by |mRegistrationMutex|.
+ */
+ nsTArray<RefPtr<Connection> > mConnections;
+
+ /**
+ * Frees as much heap memory as possible from all of the known open
+ * connections.
+ */
+ void minimizeMemory();
+
+ /**
+ * Lazily creates and returns a collator created from the application's
+ * locale that all statements of all Connections of this Service may use.
+ * Since the collator's lifetime is that of the Service and no statement may
+ * execute outside the lifetime of the Service, this method returns a raw
+ * pointer.
+ */
+ mozilla::intl::Collator* getCollator();
+
+ /**
+ * Lazily created collator that all statements of all Connections of this
+ * Service may use. The collator is created from the application's locale.
+ *
+ * @note The collator is not thread-safe since the options can be changed
+ * between calls. Access should be synchronized.
+ */
+ mozilla::UniquePtr<mozilla::intl::Collator> mCollator = nullptr;
+
+ nsCOMPtr<nsIFile> mProfileStorageFile;
+
+ nsCOMPtr<nsIMemoryReporter> mStorageSQLiteReporter;
+
+ static Service* gService;
+
+ mozilla::intl::Collator::Sensitivity mLastSensitivity;
+};
+
+} // namespace storage
+} // namespace mozilla
+
+#endif /* MOZSTORAGESERVICE_H */