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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef nsXULPrototypeCache_h__
#define nsXULPrototypeCache_h__
#include "nsCOMPtr.h"
#include "nsIObserver.h"
#include "nsJSThingHashtable.h"
#include "nsInterfaceHashtable.h"
#include "nsRefPtrHashtable.h"
#include "nsURIHashKey.h"
#include "nsXULPrototypeDocument.h"
#include "nsIStorageStream.h"
#include "mozilla/scache/StartupCache.h"
class nsIHandleReportCallback;
namespace mozilla {
class StyleSheet;
} // namespace mozilla
/**
* The XUL prototype cache can be used to store and retrieve shared data for
* XUL documents, style sheets, XBL, and scripts.
*
* The cache has two levels:
* 1. In-memory hashtables
* 2. The on-disk cache file.
*/
class nsXULPrototypeCache : public nsIObserver {
public:
// nsISupports
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIOBSERVER
bool IsCached(nsIURI* aURI) { return GetPrototype(aURI) != nullptr; }
void AbortCaching();
/**
* Whether the prototype cache is enabled.
*/
bool IsEnabled();
/**
* Flush the cache; remove all XUL prototype documents, style
* sheets, and scripts.
*/
void Flush();
// The following methods are used to put and retrive various items into and
// from the cache.
nsXULPrototypeDocument* GetPrototype(nsIURI* aURI);
nsresult PutPrototype(nsXULPrototypeDocument* aDocument);
JSScript* GetScript(nsIURI* aURI);
nsresult PutScript(nsIURI* aURI, JS::Handle<JSScript*> aScriptObject);
/**
* Get a style sheet by URI. If the style sheet is not in the cache,
* returns nullptr.
*/
mozilla::StyleSheet* GetStyleSheet(nsIURI* aURI);
/**
* Store a style sheet in the cache. The key, style sheet's URI is obtained
* from the style sheet itself.
*/
nsresult PutStyleSheet(RefPtr<mozilla::StyleSheet>&& aStyleSheet);
/**
* Write the XUL prototype document to a cache file. The proto must be
* fully loaded.
*/
nsresult WritePrototype(nsXULPrototypeDocument* aPrototypeDocument);
/**
* This interface allows partial reads and writes from the buffers in the
* startupCache.
*/
nsresult GetInputStream(nsIURI* aURI, nsIObjectInputStream** objectInput);
nsresult FinishInputStream(nsIURI* aURI);
nsresult GetOutputStream(nsIURI* aURI, nsIObjectOutputStream** objectOutput);
nsresult FinishOutputStream(nsIURI* aURI);
nsresult HasData(nsIURI* aURI, bool* exists);
static nsXULPrototypeCache* GetInstance();
static nsXULPrototypeCache* MaybeGetInstance() { return sInstance; }
static void ReleaseGlobals() { NS_IF_RELEASE(sInstance); }
void MarkInCCGeneration(uint32_t aGeneration);
void MarkInGC(JSTracer* aTrc);
void FlushScripts();
static void CollectMemoryReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData);
protected:
friend nsresult NS_NewXULPrototypeCache(nsISupports* aOuter, REFNSIID aIID,
void** aResult);
nsXULPrototypeCache();
virtual ~nsXULPrototypeCache();
static nsXULPrototypeCache* sInstance;
using StyleSheetTable = nsRefPtrHashtable<nsURIHashKey, mozilla::StyleSheet>;
nsRefPtrHashtable<nsURIHashKey, nsXULPrototypeDocument>
mPrototypeTable; // owns the prototypes
StyleSheetTable mStyleSheetTable;
nsJSThingHashtable<nsURIHashKey, JSScript*> mScriptTable;
// URIs already written to the startup cache, to prevent double-caching.
nsTHashtable<nsURIHashKey> mStartupCacheURITable;
nsInterfaceHashtable<nsURIHashKey, nsIStorageStream> mOutputStreamTable;
nsInterfaceHashtable<nsURIHashKey, nsIObjectInputStream> mInputStreamTable;
// Bootstrap caching service
nsresult BeginCaching(nsIURI* aDocumentURI);
};
#endif // nsXULPrototypeCache_h__