gecko-dev/dom/file/FileHelper.cpp
2013-04-02 16:14:00 -07:00

212 lines
4.6 KiB
C++

/* -*- 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/. */
#include "FileHelper.h"
#include "nsIFileStorage.h"
#include "nsError.h"
#include "nsProxyRelease.h"
#include "FileHandle.h"
#include "FileRequest.h"
#include "FileService.h"
#include "nsIRequest.h"
USING_FILE_NAMESPACE
namespace {
LockedFile* gCurrentLockedFile = nullptr;
} // anonymous namespace
FileHelper::FileHelper(LockedFile* aLockedFile,
FileRequest* aFileRequest)
: mFileStorage(aLockedFile->mFileHandle->mFileStorage),
mLockedFile(aLockedFile),
mFileRequest(aFileRequest),
mResultCode(NS_OK),
mFinished(false)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
}
FileHelper::~FileHelper()
{
NS_ASSERTION(!mFileStorage && !mLockedFile && !mFileRequest && !mListener &&
!mRequest, "Should have cleared this!");
}
NS_IMPL_THREADSAFE_ISUPPORTS1(FileHelper, nsIRequestObserver)
nsresult
FileHelper::Enqueue()
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
FileService* service = FileService::GetOrCreate();
NS_ENSURE_TRUE(service, NS_ERROR_FAILURE);
nsresult rv = service->Enqueue(mLockedFile, this);
NS_ENSURE_SUCCESS(rv, rv);
if (mLockedFile) {
mLockedFile->OnNewRequest();
}
return NS_OK;
}
nsresult
FileHelper::AsyncRun(FileHelperListener* aListener)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
// Assign the listener early, so we can use it synchronously if the code
// below fails.
mListener = aListener;
nsresult rv;
nsCOMPtr<nsISupports> stream;
if (mLockedFile->mRequestMode == LockedFile::PARALLEL) {
rv = mLockedFile->CreateParallelStream(getter_AddRefs(stream));
}
else {
rv = mLockedFile->GetOrCreateStream(getter_AddRefs(stream));
}
if (NS_SUCCEEDED(rv)) {
NS_ASSERTION(stream, "This should never be null!");
rv = DoAsyncRun(stream);
}
if (NS_FAILED(rv)) {
mResultCode = NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR;
Finish();
}
return NS_OK;
}
NS_IMETHODIMP
FileHelper::OnStartRequest(nsIRequest* aRequest, nsISupports* aCtxt)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
return NS_OK;
}
NS_IMETHODIMP
FileHelper::OnStopRequest(nsIRequest* aRequest, nsISupports* aCtxt,
nsresult aStatus)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
if (NS_FAILED(aStatus)) {
mResultCode = NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR;
}
Finish();
return NS_OK;
}
void
FileHelper::OnStreamProgress(uint64_t aProgress, uint64_t aProgressMax)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
if (mLockedFile->IsAborted()) {
NS_ASSERTION(mRequest, "Should have a request!\n");
nsresult rv = mRequest->Cancel(NS_BINDING_ABORTED);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to cancel the request!");
}
return;
}
if (mFileRequest) {
mFileRequest->OnProgress(aProgress, aProgressMax);
}
}
// static
LockedFile*
FileHelper::GetCurrentLockedFile()
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
return gCurrentLockedFile;
}
nsresult
FileHelper::GetSuccessResult(JSContext* aCx,
JS::Value* aVal)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
*aVal = JSVAL_VOID;
return NS_OK;
}
void
FileHelper::ReleaseObjects()
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
mFileStorage = nullptr;
mLockedFile = nullptr;
mFileRequest = nullptr;
mListener = nullptr;
mRequest = nullptr;
}
void
FileHelper::Finish()
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
if (mFinished) {
return;
}
mFinished = true;
if (mLockedFile->IsAborted()) {
// Always fire a "error" event with ABORT_ERR if the transaction was
// aborted, even if the request succeeded or failed with another error.
mResultCode = NS_ERROR_DOM_FILEHANDLE_ABORT_ERR;
}
LockedFile* oldLockedFile = gCurrentLockedFile;
gCurrentLockedFile = mLockedFile;
if (mFileRequest) {
nsresult rv = mFileRequest->NotifyHelperCompleted(this);
if (NS_SUCCEEDED(mResultCode) && NS_FAILED(rv)) {
mResultCode = rv;
}
}
NS_ASSERTION(gCurrentLockedFile == mLockedFile, "Should be unchanged!");
gCurrentLockedFile = oldLockedFile;
mLockedFile->OnRequestFinished();
mListener->OnFileHelperComplete(this);
ReleaseObjects();
NS_ASSERTION(!(mFileStorage || mLockedFile || mFileRequest || mListener ||
mRequest), "Subclass didn't call FileHelper::ReleaseObjects!");
}