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// Copyright (c) 2012 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 "base/files/file_path.h"
#include "base/metrics/field_trial.h"
#include "base/strings/stringprintf.h"
#include "net/base/cache_type.h"
#include "net/base/net_errors.h"
#include "net/disk_cache/backend_impl.h"
#include "net/disk_cache/cache_util.h"
#include "net/disk_cache/disk_cache.h"
#include "net/disk_cache/mem_backend_impl.h"
#include "net/disk_cache/simple/simple_backend_impl.h"
#ifdef USE_TRACING_CACHE_BACKEND
#include "net/disk_cache/tracing_cache_backend.h"
#endif
namespace {
// Builds an instance of the backend depending on platform, type, experiments
// etc. Takes care of the retry state. This object will self-destroy when
// finished.
class CacheCreator {
public:
CacheCreator(const base::FilePath& path, bool force, int max_bytes,
net::CacheType type, net::BackendType backend_type, uint32 flags,
base::MessageLoopProxy* thread, net::NetLog* net_log,
scoped_ptr<disk_cache::Backend>* backend,
const net::CompletionCallback& callback);
// Creates the backend.
int Run();
private:
~CacheCreator();
void DoCallback(int result);
void OnIOComplete(int result);
const base::FilePath path_;
bool force_;
bool retry_;
int max_bytes_;
net::CacheType type_;
net::BackendType backend_type_;
uint32 flags_;
scoped_refptr<base::MessageLoopProxy> thread_;
scoped_ptr<disk_cache::Backend>* backend_;
net::CompletionCallback callback_;
scoped_ptr<disk_cache::Backend> created_cache_;
net::NetLog* net_log_;
DISALLOW_COPY_AND_ASSIGN(CacheCreator);
};
CacheCreator::CacheCreator(
const base::FilePath& path, bool force, int max_bytes,
net::CacheType type, net::BackendType backend_type, uint32 flags,
base::MessageLoopProxy* thread, net::NetLog* net_log,
scoped_ptr<disk_cache::Backend>* backend,
const net::CompletionCallback& callback)
: path_(path),
force_(force),
retry_(false),
max_bytes_(max_bytes),
type_(type),
backend_type_(backend_type),
flags_(flags),
thread_(thread),
backend_(backend),
callback_(callback),
net_log_(net_log) {
}
CacheCreator::~CacheCreator() {
}
int CacheCreator::Run() {
// TODO(gavinp,pasko): While simple backend development proceeds, we're only
// testing it against net::DISK_CACHE. Turn it on for more cache types as
// appropriate.
if (backend_type_ == net::CACHE_BACKEND_SIMPLE && type_ == net::DISK_CACHE) {
disk_cache::SimpleBackendImpl* simple_cache =
new disk_cache::SimpleBackendImpl(path_, max_bytes_, type_,
thread_.get(), net_log_);
created_cache_.reset(simple_cache);
return simple_cache->Init(
base::Bind(&CacheCreator::OnIOComplete, base::Unretained(this)));
}
disk_cache::BackendImpl* new_cache =
new disk_cache::BackendImpl(path_, thread_.get(), net_log_);
created_cache_.reset(new_cache);
new_cache->SetMaxSize(max_bytes_);
new_cache->SetType(type_);
new_cache->SetFlags(flags_);
int rv = new_cache->Init(
base::Bind(&CacheCreator::OnIOComplete, base::Unretained(this)));
DCHECK_EQ(net::ERR_IO_PENDING, rv);
return rv;
}
void CacheCreator::DoCallback(int result) {
DCHECK_NE(net::ERR_IO_PENDING, result);
if (result == net::OK) {
#ifndef USE_TRACING_CACHE_BACKEND
*backend_ = created_cache_.Pass();
#else
*backend_.reset(
new disk_cache::TracingCacheBackend(created_cache_.Pass()));
#endif
} else {
LOG(ERROR) << "Unable to create cache";
}
callback_.Run(result);
delete this;
}
// If the initialization of the cache fails, and |force| is true, we will
// discard the whole cache and create a new one.
void CacheCreator::OnIOComplete(int result) {
if (result == net::OK || !force_ || retry_)
return DoCallback(result);
// This is a failure and we are supposed to try again, so delete the object,
// delete all the files, and try again.
retry_ = true;
created_cache_.reset();
if (!disk_cache::DelayedCacheCleanup(path_))
return DoCallback(result);
// The worker thread will start deleting files soon, but the original folder
// is not there anymore... let's create a new set of files.
int rv = Run();
DCHECK_EQ(net::ERR_IO_PENDING, rv);
}
} // namespace
namespace disk_cache {
int CreateCacheBackend(net::CacheType type,
net::BackendType backend_type,
const base::FilePath& path,
int max_bytes,
bool force, base::MessageLoopProxy* thread,
net::NetLog* net_log, scoped_ptr<Backend>* backend,
const net::CompletionCallback& callback) {
DCHECK(!callback.is_null());
if (type == net::MEMORY_CACHE) {
*backend = disk_cache::MemBackendImpl::CreateBackend(max_bytes, net_log);
return *backend ? net::OK : net::ERR_FAILED;
}
DCHECK(thread);
CacheCreator* creator = new CacheCreator(path, force, max_bytes, type,
backend_type, kNone,
thread, net_log, backend, callback);
return creator->Run();
}
} // namespace disk_cache
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