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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "webkit/browser/fileapi/recursive_operation_delegate.h"
#include "base/bind.h"
#include "webkit/browser/fileapi/file_system_context.h"
#include "webkit/browser/fileapi/file_system_operation_runner.h"
namespace fileapi {
namespace {
// Don't start too many inflight operations.
const int kMaxInflightOperations = 5;
}
RecursiveOperationDelegate::RecursiveOperationDelegate(
FileSystemContext* file_system_context)
: file_system_context_(file_system_context),
inflight_operations_(0),
canceled_(false) {
}
RecursiveOperationDelegate::~RecursiveOperationDelegate() {
}
void RecursiveOperationDelegate::Cancel() {
canceled_ = true;
OnCancel();
}
void RecursiveOperationDelegate::StartRecursiveOperation(
const FileSystemURL& root,
const StatusCallback& callback) {
DCHECK(pending_directory_stack_.empty());
DCHECK(pending_files_.empty());
DCHECK_EQ(0, inflight_operations_);
callback_ = callback;
++inflight_operations_;
ProcessFile(
root,
base::Bind(&RecursiveOperationDelegate::DidTryProcessFile,
AsWeakPtr(), root));
}
FileSystemOperationRunner* RecursiveOperationDelegate::operation_runner() {
return file_system_context_->operation_runner();
}
void RecursiveOperationDelegate::OnCancel() {
}
void RecursiveOperationDelegate::DidTryProcessFile(
const FileSystemURL& root,
base::File::Error error) {
DCHECK(pending_directory_stack_.empty());
DCHECK(pending_files_.empty());
DCHECK_EQ(1, inflight_operations_);
--inflight_operations_;
if (canceled_ || error != base::File::FILE_ERROR_NOT_A_FILE) {
Done(error);
return;
}
pending_directory_stack_.push(std::queue<FileSystemURL>());
pending_directory_stack_.top().push(root);
ProcessNextDirectory();
}
void RecursiveOperationDelegate::ProcessNextDirectory() {
DCHECK(pending_files_.empty());
DCHECK(!pending_directory_stack_.empty());
DCHECK(!pending_directory_stack_.top().empty());
DCHECK_EQ(0, inflight_operations_);
const FileSystemURL& url = pending_directory_stack_.top().front();
++inflight_operations_;
ProcessDirectory(
url,
base::Bind(
&RecursiveOperationDelegate::DidProcessDirectory, AsWeakPtr()));
}
void RecursiveOperationDelegate::DidProcessDirectory(
base::File::Error error) {
DCHECK(pending_files_.empty());
DCHECK(!pending_directory_stack_.empty());
DCHECK(!pending_directory_stack_.top().empty());
DCHECK_EQ(1, inflight_operations_);
--inflight_operations_;
if (canceled_ || error != base::File::FILE_OK) {
Done(error);
return;
}
const FileSystemURL& parent = pending_directory_stack_.top().front();
pending_directory_stack_.push(std::queue<FileSystemURL>());
operation_runner()->ReadDirectory(
parent,
base::Bind(&RecursiveOperationDelegate::DidReadDirectory,
AsWeakPtr(), parent));
}
void RecursiveOperationDelegate::DidReadDirectory(
const FileSystemURL& parent,
base::File::Error error,
const FileEntryList& entries,
bool has_more) {
DCHECK(pending_files_.empty());
DCHECK(!pending_directory_stack_.empty());
DCHECK_EQ(0, inflight_operations_);
if (canceled_ || error != base::File::FILE_OK) {
Done(error);
return;
}
for (size_t i = 0; i < entries.size(); i++) {
FileSystemURL url = file_system_context_->CreateCrackedFileSystemURL(
parent.origin(),
parent.mount_type(),
parent.virtual_path().Append(entries[i].name));
if (entries[i].is_directory)
pending_directory_stack_.top().push(url);
else
pending_files_.push(url);
}
// Wait for next entries.
if (has_more)
return;
ProcessPendingFiles();
}
void RecursiveOperationDelegate::ProcessPendingFiles() {
DCHECK(!pending_directory_stack_.empty());
if ((pending_files_.empty() || canceled_) && inflight_operations_ == 0) {
ProcessSubDirectory();
return;
}
// Do not post any new tasks.
if (canceled_)
return;
// Run ProcessFile in parallel (upto kMaxInflightOperations).
scoped_refptr<base::MessageLoopProxy> current_message_loop =
base::MessageLoopProxy::current();
while (!pending_files_.empty() &&
inflight_operations_ < kMaxInflightOperations) {
++inflight_operations_;
current_message_loop->PostTask(
FROM_HERE,
base::Bind(&RecursiveOperationDelegate::ProcessFile,
AsWeakPtr(), pending_files_.front(),
base::Bind(&RecursiveOperationDelegate::DidProcessFile,
AsWeakPtr())));
pending_files_.pop();
}
}
void RecursiveOperationDelegate::DidProcessFile(
base::File::Error error) {
--inflight_operations_;
if (error != base::File::FILE_OK) {
// If an error occurs, invoke Done immediately (even if there remain
// running operations). It is because in the callback, this instance is
// deleted.
Done(error);
return;
}
ProcessPendingFiles();
}
void RecursiveOperationDelegate::ProcessSubDirectory() {
DCHECK(pending_files_.empty());
DCHECK(!pending_directory_stack_.empty());
DCHECK_EQ(0, inflight_operations_);
if (canceled_) {
Done(base::File::FILE_ERROR_ABORT);
return;
}
if (!pending_directory_stack_.top().empty()) {
// There remain some sub directories. Process them first.
ProcessNextDirectory();
return;
}
// All subdirectories are processed.
pending_directory_stack_.pop();
if (pending_directory_stack_.empty()) {
// All files/directories are processed.
Done(base::File::FILE_OK);
return;
}
DCHECK(!pending_directory_stack_.top().empty());
++inflight_operations_;
PostProcessDirectory(
pending_directory_stack_.top().front(),
base::Bind(&RecursiveOperationDelegate::DidPostProcessDirectory,
AsWeakPtr()));
}
void RecursiveOperationDelegate::DidPostProcessDirectory(
base::File::Error error) {
DCHECK(pending_files_.empty());
DCHECK(!pending_directory_stack_.empty());
DCHECK(!pending_directory_stack_.top().empty());
DCHECK_EQ(1, inflight_operations_);
--inflight_operations_;
pending_directory_stack_.top().pop();
if (canceled_ || error != base::File::FILE_OK) {
Done(error);
return;
}
ProcessSubDirectory();
}
void RecursiveOperationDelegate::Done(base::File::Error error) {
if (canceled_ && error == base::File::FILE_OK) {
callback_.Run(base::File::FILE_ERROR_ABORT);
} else {
callback_.Run(error);
}
}
} // namespace fileapi
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