gecko/dom/file/FileService.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: */
/* 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_file_fileservice_h__
#define mozilla_dom_file_fileservice_h__
#include "FileCommon.h"
#include "nsIObserver.h"
#include "nsClassHashtable.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/file/FileHelper.h"
#include "mozilla/dom/file/LockedFile.h"
BEGIN_FILE_NAMESPACE
class FileService MOZ_FINAL : public nsIObserver
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
// Returns a non-owning reference!
static FileService*
GetOrCreate();
// Returns a non-owning reference!
static FileService*
Get();
static void
Shutdown();
// Returns true if we've begun the shutdown process.
static bool
IsShuttingDown();
nsresult
Enqueue(LockedFile* aLockedFile, FileHelper* aFileHelper);
void
NotifyLockedFileCompleted(LockedFile* aLockedFile);
void
WaitForStoragesToComplete(nsTArray<nsCOMPtr<nsIFileStorage> >& aStorages,
nsIRunnable* aCallback);
void
AbortLockedFilesForStorage(nsIFileStorage* aFileStorage);
bool
HasLockedFilesForStorage(nsIFileStorage* aFileStorage);
nsIEventTarget*
StreamTransportTarget()
{
NS_ASSERTION(mStreamTransportTarget, "This should never be null!");
return mStreamTransportTarget;
}
private:
class LockedFileQueue MOZ_FINAL : public FileHelperListener
{
friend class FileService;
public:
NS_IMETHOD_(nsrefcnt)
AddRef() MOZ_OVERRIDE;
NS_IMETHOD_(nsrefcnt)
Release() MOZ_OVERRIDE;
inline nsresult
Enqueue(FileHelper* aFileHelper);
virtual void
OnFileHelperComplete(FileHelper* aFileHelper) MOZ_OVERRIDE;
private:
inline
LockedFileQueue(LockedFile* aLockedFile);
nsresult
ProcessQueue();
nsAutoRefCnt mRefCnt;
NS_DECL_OWNINGTHREAD
nsRefPtr<LockedFile> mLockedFile;
nsTArray<nsRefPtr<FileHelper> > mQueue;
nsRefPtr<FileHelper> mCurrentHelper;
};
struct DelayedEnqueueInfo
{
nsRefPtr<LockedFile> mLockedFile;
nsRefPtr<FileHelper> mFileHelper;
};
class FileStorageInfo
{
friend class FileService;
public:
inline LockedFileQueue*
CreateLockedFileQueue(LockedFile* aLockedFile);
inline LockedFileQueue*
GetLockedFileQueue(LockedFile* aLockedFile);
void
RemoveLockedFileQueue(LockedFile* aLockedFile);
bool
HasRunningLockedFiles()
{
return !mLockedFileQueues.IsEmpty();
}
inline bool
HasRunningLockedFiles(nsIFileStorage* aFileStorage);
inline DelayedEnqueueInfo*
CreateDelayedEnqueueInfo(LockedFile* aLockedFile, FileHelper* aFileHelper);
inline void
CollectRunningAndDelayedLockedFiles(
nsIFileStorage* aFileStorage,
nsTArray<nsRefPtr<LockedFile> >& aLockedFiles);
void
LockFileForReading(const nsAString& aFileName)
{
mFilesReading.PutEntry(aFileName);
}
void
LockFileForWriting(const nsAString& aFileName)
{
mFilesWriting.PutEntry(aFileName);
}
bool
IsFileLockedForReading(const nsAString& aFileName)
{
return mFilesReading.Contains(aFileName);
}
bool
IsFileLockedForWriting(const nsAString& aFileName)
{
return mFilesWriting.Contains(aFileName);
}
private:
FileStorageInfo()
{
mFilesReading.Init();
mFilesWriting.Init();
}
nsTArray<nsRefPtr<LockedFileQueue> > mLockedFileQueues;
nsTArray<DelayedEnqueueInfo> mDelayedEnqueueInfos;
nsTHashtable<nsStringHashKey> mFilesReading;
nsTHashtable<nsStringHashKey> mFilesWriting;
};
struct StoragesCompleteCallback
{
nsTArray<nsCOMPtr<nsIFileStorage> > mStorages;
nsCOMPtr<nsIRunnable> mCallback;
};
FileService();
~FileService();
nsresult
Init();
nsresult
Cleanup();
bool
MaybeFireCallback(StoragesCompleteCallback& aCallback);
nsCOMPtr<nsIEventTarget> mStreamTransportTarget;
nsClassHashtable<nsISupportsHashKey, FileStorageInfo> mFileStorageInfos;
nsTArray<StoragesCompleteCallback> mCompleteCallbacks;
};
END_FILE_NAMESPACE
#endif /* mozilla_dom_file_fileservice_h__ */