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// Copyright (c) 2011 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 WEBKIT_APPCACHE_APPCACHE_DISK_CACHE_H_
#define WEBKIT_APPCACHE_APPCACHE_DISK_CACHE_H_
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "net/disk_cache/disk_cache.h"
namespace appcache {
// A thin wrapper around net::DiskCache that does a couple of things for us.
//
// 1. Translates int64 keys used by the appcache into std::string
// keys used by net::DiskCache.
// 2. Allows 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.
class AppCacheDiskCache {
public:
AppCacheDiskCache();
~AppCacheDiskCache();
// Initializes the object to use disk backed storage.
int InitWithDiskBackend(const FilePath& disk_cache_directory,
int disk_cache_size, bool force,
base::MessageLoopProxy* cache_thread,
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,
net::CompletionCallback* callback);
void Disable();
bool is_disabled() const { return is_disabled_; }
int CreateEntry(int64 key, disk_cache::Entry** entry,
net::CompletionCallback* callback);
int OpenEntry(int64 key, disk_cache::Entry** entry,
net::CompletionCallback* callback);
int DoomEntry(int64 key, net::CompletionCallback* callback);
private:
class CreateBackendCallback
: public net::CancelableCompletionCallback<AppCacheDiskCache> {
public:
typedef net::CancelableCompletionCallback<AppCacheDiskCache> BaseClass;
CreateBackendCallback(AppCacheDiskCache* object,
void (AppCacheDiskCache::* method)(int))
: BaseClass(object, method), backend_ptr_(NULL) {}
disk_cache::Backend* backend_ptr_; // Accessed directly.
private:
~CreateBackendCallback() {
delete backend_ptr_;
}
};
enum PendingCallType {
CREATE,
OPEN,
DOOM
};
struct PendingCall {
PendingCallType call_type;
int64 key;
disk_cache::Entry** entry;
net::CompletionCallback* callback;
PendingCall()
: call_type(CREATE), key(0), entry(NULL), callback(NULL) {}
PendingCall(PendingCallType call_type, int64 key,
disk_cache::Entry** entry, net::CompletionCallback* callback)
: call_type(call_type), key(key), entry(entry), callback(callback) {}
};
typedef std::vector<PendingCall> PendingCalls;
bool is_initializing() const {
return create_backend_callback_.get() != NULL;
}
int Init(net::CacheType cache_type, const FilePath& directory,
int cache_size, bool force, base::MessageLoopProxy* cache_thread,
net::CompletionCallback* callback);
void OnCreateBackendComplete(int rv);
bool is_disabled_;
net::CompletionCallback* init_callback_;
scoped_refptr<CreateBackendCallback> create_backend_callback_;
PendingCalls pending_calls_;
scoped_ptr<disk_cache::Backend> disk_cache_;
};
} // namespace appcache
#endif // WEBKIT_APPCACHE_APPCACHE_DISK_CACHE_H_
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