gecko-dev/xpcom/ds/nsISizeOfHandler.h

105 lines
3.6 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef nsISizeOfHandler_h___
#define nsISizeOfHandler_h___
#include "nscore.h"
#include "nsISupports.h"
/* c028d1f0-fc9e-11d1-89e4-006008911b81 */
#define NS_ISIZEOF_HANDLER_IID \
{ 0xc028d1f0, 0xfc9e, 0x11d1, {0x89, 0xe4, 0x00, 0x60, 0x08, 0x91, 0x1b, 0x81}}
class nsIAtom;
class nsISizeOfHandler;
/**
* Function used by the Report method to report data gathered during
* a collection of data.
*/
typedef void (*nsISizeofReportFunc)(nsISizeOfHandler* aHandler,
nsIAtom* aKey,
PRUint32 aCount,
PRUint32 aTotalSize,
PRUint32 aMinSize,
PRUint32 aMaxSize,
void* aArg);
/**
* An API to managing a sizeof computation of an arbitrary graph.
* The handler is responsible for remembering which objects have been
* seen before (using RecordObject). Note that the handler doesn't
* hold references to nsISupport's objects; the assumption is that the
* objects being sized are stationary and will not be modified during
* the sizing computation and therefore do not need an extra reference
* count.
*
* Users of this API are responsible for the actual graph/tree walking.
*/
class nsISizeOfHandler : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISIZEOF_HANDLER_IID)
/**
* Initialize the handler for a new collection of data. This empties
* out the object prescence table and the keyed size table.
*/
NS_IMETHOD Init() = 0;
/**
* Record the sizing status of a given object. The first time
* aObject is recorded, aResult will be PR_FALSE. Subsequent times,
* aResult will be PR_TRUE.
*/
NS_IMETHOD RecordObject(void* aObject, PRBool* aResult) = 0;
/**
* Add size information to the running size data. The atom is used
* as a key to keep type specific running totals of size
* information. This increments the total count and the total size
* as well as updates the minimum, maximum and total size for aKey's
* type.
*/
NS_IMETHOD AddSize(nsIAtom* aKey, PRUint32 aSize) = 0;
/**
* Enumerate data collected for each type and invoke the
* reporting function with the data gathered.
*/
NS_IMETHOD Report(nsISizeofReportFunc aFunc, void* aArg) = 0;
/**
* Get the current totals - the number of total objects sized (not
* necessarily anything to do with RecordObject's tracking of
* objects) and the total number of bytes that those object use. The
* counters are not reset by this call (use Init to reset
* everything).
*/
NS_IMETHOD GetTotals(PRUint32* aTotalCountResult,
PRUint32* aTotalSizeResult) = 0;
};
extern NS_COM nsresult
NS_NewSizeOfHandler(nsISizeOfHandler** aInstancePtrResult);
#endif /* nsISizeofHandler_h___ */