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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.
#ifndef CONTENT_BROWSER_APPCACHE_APPCACHE_DISK_CACHE_H_
#define CONTENT_BROWSER_APPCACHE_APPCACHE_DISK_CACHE_H_
#include <set>
#include <vector>
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "content/browser/appcache/appcache_response.h"
#include "content/common/content_export.h"
#include "net/disk_cache/disk_cache.h"
namespace base {
class SingleThreadTaskRunner;
} // namespace base
namespace content {
// An implementation of AppCacheDiskCacheInterface that
// uses net::DiskCache as the backing store.
class CONTENT_EXPORT AppCacheDiskCache
: public AppCacheDiskCacheInterface {
public:
AppCacheDiskCache();
~AppCacheDiskCache() override;
// Initializes the object to use disk backed storage.
int InitWithDiskBackend(
const base::FilePath& disk_cache_directory,
int disk_cache_size,
bool force,
const scoped_refptr<base::SingleThreadTaskRunner>& cache_thread,
const net::CompletionCallback& callback);
// Initializes the object to use memory only storage.
// This is used for Chrome's incognito browsing.
int InitWithMemBackend(int disk_cache_size,
const net::CompletionCallback& callback);
void Disable();
bool is_disabled() const { return is_disabled_; }
int CreateEntry(int64 key,
Entry** entry,
const net::CompletionCallback& callback) override;
int OpenEntry(int64 key,
Entry** entry,
const net::CompletionCallback& callback) override;
int DoomEntry(int64 key, const net::CompletionCallback& callback) override;
private:
class CreateBackendCallbackShim;
class EntryImpl;
// PendingCalls allow CreateEntry, OpenEntry, and DoomEntry to be called
// immediately after construction, without waiting for the
// underlying disk_cache::Backend to be fully constructed. Early
// calls are queued up and serviced once the disk_cache::Backend is
// really ready to go.
enum PendingCallType {
CREATE,
OPEN,
DOOM
};
struct PendingCall {
PendingCallType call_type;
int64 key;
Entry** entry;
net::CompletionCallback callback;
PendingCall();
PendingCall(PendingCallType call_type, int64 key,
Entry** entry, const net::CompletionCallback& callback);
~PendingCall();
};
typedef std::vector<PendingCall> PendingCalls;
class ActiveCall;
typedef std::set<ActiveCall*> ActiveCalls;
typedef std::set<EntryImpl*> OpenEntries;
bool is_initializing() const {
return create_backend_callback_.get() != NULL;
}
disk_cache::Backend* disk_cache() { return disk_cache_.get(); }
int Init(net::CacheType cache_type,
const base::FilePath& directory,
int cache_size,
bool force,
const scoped_refptr<base::SingleThreadTaskRunner>& cache_thread,
const net::CompletionCallback& callback);
void OnCreateBackendComplete(int rv);
void AddActiveCall(ActiveCall* call) { active_calls_.insert(call); }
void RemoveActiveCall(ActiveCall* call) { active_calls_.erase(call); }
void AddOpenEntry(EntryImpl* entry) { open_entries_.insert(entry); }
void RemoveOpenEntry(EntryImpl* entry) { open_entries_.erase(entry); }
bool is_disabled_;
net::CompletionCallback init_callback_;
scoped_refptr<CreateBackendCallbackShim> create_backend_callback_;
PendingCalls pending_calls_;
ActiveCalls active_calls_;
OpenEntries open_entries_;
scoped_ptr<disk_cache::Backend> disk_cache_;
};
} // namespace content
#endif // CONTENT_BROWSER_APPCACHE_APPCACHE_DISK_CACHE_H_
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