gecko/dom/indexedDB/IndexedDatabaseManager.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
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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/. */
#ifndef mozilla_dom_indexeddb_indexeddatabasemanager_h__
#define mozilla_dom_indexeddb_indexeddatabasemanager_h__
#include "mozilla/dom/indexedDB/IndexedDatabase.h"
#include "mozilla/Mutex.h"
#include "nsIIndexedDatabaseManager.h"
#include "nsIObserver.h"
#include "nsIRunnable.h"
#include "nsIThread.h"
#include "nsIURI.h"
#include "nsClassHashtable.h"
#include "nsRefPtrHashtable.h"
#include "nsHashKeys.h"
#define INDEXEDDB_MANAGER_CONTRACTID "@mozilla.org/dom/indexeddb/manager;1"
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class mozIStorageQuotaCallback;
class nsIAtom;
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class nsIFile;
class nsITimer;
class nsPIDOMWindow;
BEGIN_INDEXEDDB_NAMESPACE
class AsyncConnectionHelper;
class CheckQuotaHelper;
class FileManager;
class IDBDatabase;
class IndexedDatabaseManager MOZ_FINAL : public nsIIndexedDatabaseManager,
public nsIObserver
{
friend class IDBDatabase;
public:
static already_AddRefed<IndexedDatabaseManager> GetOrCreate();
// Returns a non-owning reference.
static IndexedDatabaseManager* Get();
// Returns an owning reference! No one should call this but the factory.
static IndexedDatabaseManager* FactoryCreate();
NS_DECL_ISUPPORTS
NS_DECL_NSIINDEXEDDATABASEMANAGER
NS_DECL_NSIOBSERVER
// Waits for databases to be cleared and for version change transactions to
// complete before dispatching the given runnable.
nsresult WaitForOpenAllowed(const nsACString& aOrigin,
nsIAtom* aId,
nsIRunnable* aRunnable);
void AllowNextSynchronizedOp(const nsACString& aOrigin,
nsIAtom* aId);
nsIThread* IOThread()
{
NS_ASSERTION(mIOThread, "This should never be null!");
return mIOThread;
}
// Returns true if we've begun the shutdown process.
static bool IsShuttingDown();
static bool IsClosed();
typedef void
(*WaitingOnDatabasesCallback)(nsTArray<nsRefPtr<IDBDatabase> >&, void*);
// Acquire exclusive access to the database given (waits for all others to
// close). If databases need to close first, the callback will be invoked
// with an array of said databases.
nsresult AcquireExclusiveAccess(IDBDatabase* aDatabase,
const nsACString& aOrigin,
AsyncConnectionHelper* aHelper,
WaitingOnDatabasesCallback aCallback,
void* aClosure)
{
NS_ASSERTION(aDatabase, "Need a DB here!");
return AcquireExclusiveAccess(aOrigin, aDatabase, aHelper, nsnull,
aCallback, aClosure);
}
nsresult AcquireExclusiveAccess(const nsACString& aOrigin,
nsIRunnable* aRunnable,
WaitingOnDatabasesCallback aCallback,
void* aClosure)
{
return AcquireExclusiveAccess(aOrigin, nsnull, nsnull, aRunnable, aCallback,
aClosure);
}
// Called when a window is being purged from the bfcache or the user leaves
// a page which isn't going into the bfcache. Forces any live database
// objects to close themselves and aborts any running transactions.
void AbortCloseDatabasesForWindow(nsPIDOMWindow* aWindow);
// Used to check if there are running transactions in a given window.
bool HasOpenTransactions(nsPIDOMWindow* aWindow);
// Set the Window that the current thread is doing operations for.
// The caller is responsible for ensuring that aWindow is held alive.
static inline void
SetCurrentWindow(nsPIDOMWindow* aWindow)
{
IndexedDatabaseManager* mgr = Get();
NS_ASSERTION(mgr, "Must have a manager here!");
return mgr->SetCurrentWindowInternal(aWindow);
}
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static PRUint32
GetIndexedDBQuotaMB();
nsresult EnsureOriginIsInitialized(const nsACString& aOrigin,
nsIFile** aDirectory);
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// Determine if the quota is lifted for the Window the current thread is
// using.
static inline bool
QuotaIsLifted()
{
IndexedDatabaseManager* mgr = Get();
NS_ASSERTION(mgr, "Must have a manager here!");
return mgr->QuotaIsLiftedInternal();
}
static inline void
CancelPromptsForWindow(nsPIDOMWindow* aWindow)
{
IndexedDatabaseManager* mgr = Get();
NS_ASSERTION(mgr, "Must have a manager here!");
mgr->CancelPromptsForWindowInternal(aWindow);
}
static nsresult
GetASCIIOriginFromWindow(nsPIDOMWindow* aWindow, nsCString& aASCIIOrigin);
static bool
IsMainProcess()
#ifdef DEBUG
;
#else
{
return sIsMainProcess;
}
#endif
already_AddRefed<FileManager>
GetOrCreateFileManager(const nsACString& aOrigin,
const nsAString& aDatabaseName);
already_AddRefed<FileManager>
GetFileManager(const nsACString& aOrigin,
const nsAString& aDatabaseName);
void InvalidateFileManagersForOrigin(const nsACString& aOrigin);
void InvalidateFileManager(const nsACString& aOrigin,
const nsAString& aDatabaseName);
nsresult AsyncDeleteFile(FileManager* aFileManager,
PRInt64 aFileId);
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const nsString&
GetBaseDirectory() const
{
return mDatabaseBasePath;
}
nsresult
GetDirectoryForOrigin(const nsACString& aASCIIOrigin,
nsIFile** aDirectory) const;
static mozilla::Mutex& FileMutex()
{
IndexedDatabaseManager* mgr = Get();
NS_ASSERTION(mgr, "Must have a manager here!");
return mgr->mFileMutex;
}
static already_AddRefed<nsIAtom>
GetDatabaseId(const nsACString& aOrigin,
const nsAString& aName);
private:
IndexedDatabaseManager();
~IndexedDatabaseManager();
nsresult AcquireExclusiveAccess(const nsACString& aOrigin,
IDBDatabase* aDatabase,
AsyncConnectionHelper* aHelper,
nsIRunnable* aRunnable,
WaitingOnDatabasesCallback aCallback,
void* aClosure);
void SetCurrentWindowInternal(nsPIDOMWindow* aWindow);
bool QuotaIsLiftedInternal();
void CancelPromptsForWindowInternal(nsPIDOMWindow* aWindow);
// Called when a database is created.
bool RegisterDatabase(IDBDatabase* aDatabase);
// Called when a database is being unlinked or destroyed.
void UnregisterDatabase(IDBDatabase* aDatabase);
// Called when a database has been closed.
void OnDatabaseClosed(IDBDatabase* aDatabase);
// Responsible for clearing the database files for a particular origin on the
// IO thread. Created when nsIIDBIndexedDatabaseManager::ClearDatabasesForURI
// is called. Runs three times, first on the main thread, next on the IO
// thread, and then finally again on the main thread. While on the IO thread
// the runnable will actually remove the origin's database files and the
// directory that contains them before dispatching itself back to the main
// thread. When back on the main thread the runnable will notify the
// IndexedDatabaseManager that the job has been completed.
class OriginClearRunnable MOZ_FINAL : public nsIRunnable
{
enum CallbackState {
// Not yet run.
Pending = 0,
// Running on the main thread in the callback for OpenAllowed.
OpenAllowed,
// Running on the IO thread.
IO,
// Running on the main thread after all work is done.
Complete
};
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
OriginClearRunnable(const nsACString& aOrigin)
: mOrigin(aOrigin),
mCallbackState(Pending)
{ }
void AdvanceState()
{
switch (mCallbackState) {
case Pending:
mCallbackState = OpenAllowed;
return;
case OpenAllowed:
mCallbackState = IO;
return;
case IO:
mCallbackState = Complete;
return;
default:
NS_NOTREACHED("Can't advance past Complete!");
}
}
static void InvalidateOpenedDatabases(
nsTArray<nsRefPtr<IDBDatabase> >& aDatabases,
void* aClosure);
private:
nsCString mOrigin;
CallbackState mCallbackState;
};
// Responsible for calculating the amount of space taken up by databases of a
// certain origin. Created when nsIIDBIndexedDatabaseManager::GetUsageForURI
// is called. May be canceled with
// nsIIDBIndexedDatabaseManager::CancelGetUsageForURI. Runs twice, first on
// the IO thread, then again on the main thread. While on the IO thread the
// runnable will calculate the size of all files in the origin's directory
// before dispatching itself back to the main thread. When on the main thread
// the runnable will call the callback and then notify the
// IndexedDatabaseManager that the job has been completed.
class AsyncUsageRunnable MOZ_FINAL : public nsIRunnable
{
enum CallbackState {
// Not yet run.
Pending = 0,
// Running on the main thread in the callback for OpenAllowed.
OpenAllowed,
// Running on the IO thread.
IO,
// Running on the main thread after all work is done.
Complete,
// Running on the main thread after skipping the work
Shortcut
};
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
AsyncUsageRunnable(nsIURI* aURI,
const nsACString& aOrigin,
nsIIndexedDatabaseUsageCallback* aCallback);
// Sets the canceled flag so that the callback is never called.
void Cancel();
void AdvanceState()
{
switch (mCallbackState) {
case Pending:
mCallbackState = OpenAllowed;
return;
case OpenAllowed:
mCallbackState = IO;
return;
case IO:
mCallbackState = Complete;
return;
default:
NS_NOTREACHED("Can't advance past Complete!");
}
}
nsresult TakeShortcut();
// Run calls the RunInternal method and makes sure that we always dispatch
// to the main thread in case of an error.
inline nsresult RunInternal();
nsresult GetUsageForDirectory(nsIFile* aDirectory,
PRUint64* aUsage);
nsCOMPtr<nsIURI> mURI;
nsCString mOrigin;
nsCOMPtr<nsIIndexedDatabaseUsageCallback> mCallback;
PRUint64 mUsage;
PRUint64 mFileUsage;
PRInt32 mCanceled;
CallbackState mCallbackState;
};
// Called when AsyncUsageRunnable has finished its Run() method.
inline void OnUsageCheckComplete(AsyncUsageRunnable* aRunnable);
// A struct that contains the information corresponding to a pending or
// running operation that requires synchronization (e.g. opening a db,
// clearing dbs for an origin, etc).
struct SynchronizedOp
{
SynchronizedOp(const nsACString& aOrigin, nsIAtom* aId);
~SynchronizedOp();
// Test whether the second SynchronizedOp needs to get behind this one.
bool MustWaitFor(const SynchronizedOp& aRhs) const;
void DelayRunnable(nsIRunnable* aRunnable);
void DispatchDelayedRunnables();
const nsCString mOrigin;
nsCOMPtr<nsIAtom> mId;
nsRefPtr<AsyncConnectionHelper> mHelper;
nsCOMPtr<nsIRunnable> mRunnable;
nsTArray<nsCOMPtr<nsIRunnable> > mDelayedRunnables;
nsTArray<nsRefPtr<IDBDatabase> > mDatabases;
};
// A callback runnable used by the TransactionPool when it's safe to proceed
// with a SetVersion/DeleteDatabase/etc.
class WaitForTransactionsToFinishRunnable MOZ_FINAL : public nsIRunnable
{
public:
WaitForTransactionsToFinishRunnable(SynchronizedOp* aOp,
PRUint32 aCountdown)
: mOp(aOp), mCountdown(aCountdown)
{
NS_ASSERTION(mOp, "Why don't we have a runnable?");
NS_ASSERTION(mOp->mDatabases.IsEmpty(), "We're here too early!");
NS_ASSERTION(mOp->mHelper || mOp->mRunnable,
"What are we supposed to do when we're done?");
NS_ASSERTION(mCountdown, "Wrong countdown!");
}
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
private:
// The IndexedDatabaseManager holds this alive.
SynchronizedOp* mOp;
PRUint32 mCountdown;
};
class WaitForLockedFilesToFinishRunnable MOZ_FINAL : public nsIRunnable
{
public:
WaitForLockedFilesToFinishRunnable()
: mBusy(true)
{ }
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
bool IsBusy() const
{
return mBusy;
}
private:
bool mBusy;
};
class AsyncDeleteFileRunnable MOZ_FINAL : public nsIRunnable
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
AsyncDeleteFileRunnable(const nsAString& aFilePath)
: mFilePath(aFilePath)
{ }
private:
nsString mFilePath;
};
static nsresult RunSynchronizedOp(IDBDatabase* aDatabase,
SynchronizedOp* aOp);
SynchronizedOp* FindSynchronizedOp(const nsACString& aOrigin,
nsIAtom* aId)
{
for (PRUint32 index = 0; index < mSynchronizedOps.Length(); index++) {
const nsAutoPtr<SynchronizedOp>& currentOp = mSynchronizedOps[index];
if (currentOp->mOrigin == aOrigin &&
(!currentOp->mId || currentOp->mId == aId)) {
return currentOp;
}
}
return nsnull;
}
bool IsClearOriginPending(const nsACString& aOrigin)
{
return !!FindSynchronizedOp(aOrigin, nsnull);
}
// Maintains a list of live databases per origin.
nsClassHashtable<nsCStringHashKey, nsTArray<IDBDatabase*> > mLiveDatabases;
// TLS storage index for the current thread's window
PRUintn mCurrentWindowIndex;
// Lock protecting mQuotaHelperHash
mozilla::Mutex mQuotaHelperMutex;
// A map of Windows to the corresponding quota helper.
nsRefPtrHashtable<nsPtrHashKey<nsPIDOMWindow>, CheckQuotaHelper> mQuotaHelperHash;
// Maintains a list of all file managers per origin. The list is actually also
// a list of all origins that were successfully initialized. This list
// isn't protected by any mutex but it is only ever touched on the IO thread.
nsClassHashtable<nsCStringHashKey,
nsTArray<nsRefPtr<FileManager> > > mFileManagers;
// Maintains a list of origins that we're currently enumerating to gather
// usage statistics.
nsAutoTArray<nsRefPtr<AsyncUsageRunnable>, 1> mUsageRunnables;
// Maintains a list of synchronized operatons that are in progress or queued.
nsAutoTArray<nsAutoPtr<SynchronizedOp>, 5> mSynchronizedOps;
// Thread on which IO is performed.
nsCOMPtr<nsIThread> mIOThread;
// A timer that gets activated at shutdown to ensure we close all databases.
nsCOMPtr<nsITimer> mShutdownTimer;
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// A single threadsafe instance of our quota callback. Created on the main
// thread during GetOrCreate().
nsCOMPtr<mozIStorageQuotaCallback> mQuotaCallbackSingleton;
// Lock protecting FileManager.mFileInfos and nsDOMFileBase.mFileInfos
// It's s also used to atomically update FileInfo.mRefCnt, FileInfo.mDBRefCnt
// and FileInfo.mSliceRefCnt
mozilla::Mutex mFileMutex;
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nsString mDatabaseBasePath;
static bool sIsMainProcess;
};
class AutoEnterWindow
{
public:
AutoEnterWindow(nsPIDOMWindow* aWindow)
{
IndexedDatabaseManager::SetCurrentWindow(aWindow);
}
~AutoEnterWindow()
{
IndexedDatabaseManager::SetCurrentWindow(nsnull);
}
};
END_INDEXEDDB_NAMESPACE
#endif /* mozilla_dom_indexeddb_indexeddatabasemanager_h__ */