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Made QI try the current object delegating to outer. Removed QI for kISupportsIID (which returned Internal). Added nsIOuter interfacewhich allows for notification of child release.

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This commit is contained in:
warren%netscape.com 1998-09-01 00:17:28 +00:00
parent 3631ffe2b5
commit 8a20456a35
1 changed files with 54 additions and 11 deletions
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65
xpcom/src/nsAgg.h
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@ -1,4 +1,4 @@
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
@ -21,6 +21,37 @@
#include "nsISupports.h"
/**
* Outer objects can implement nsIOuter if they choose, allowing them to
* get notification if their inner objects (children) are effectively freed.
* This allows them to reset any state associated with the inner object and
* potentially unload it.
*/
class nsIOuter : public nsISupports {
public:
/**
* This method is called whenever an inner object's refcount is about to
* become zero and the inner object should be released by the outer. This
* allows the outer to clean up any state associated with the inner and
* potentially unload the inner object. This method should call
* inner->Release().
*/
NS_IMETHOD
ReleaseInner(nsISupports* inner) = 0;
};
#define NS_IOUTER_IID \
{ /* ea0bf9f0-3d67-11d2-8163-006008119d7a */ \
0xea0bf9f0, \
0x3d67, \
0x11d2, \
{0x81, 0x63, 0x00, 0x60, 0x08, 0x11, 0x9d, 0x7a} \
}
////////////////////////////////////////////////////////////////////////////////
// Put this in your class's declaration:
#define NS_DECL_AGGREGATED \
NS_DECL_ISUPPORTS \
@ -49,6 +80,8 @@ protected: \
nsISupports* fOuter; \
Internal fAggregated; \
\
nsISupports* GetInner(void) { return &fAggregated; } \
\
public: \
@ -63,31 +96,41 @@ public: \
NS_IMETHODIMP \
_class::QueryInterface(const nsIID& aIID, void** aInstancePtr) \
{ \
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID); \
if (aIID.Equals(kISupportsIID)) { \
*aInstancePtr = &fAggregated; \
return NS_OK; \
} \
else if (fOuter) \
/* try our own interfaces first before delegating to outer */ \
nsresult rslt = AggregatedQueryInterface(aIID, aInstancePtr); \
if (rslt != NS_OK && fOuter) \
return fOuter->QueryInterface(aIID, aInstancePtr); \
else \
return AggregatedQueryInterface(aIID, aInstancePtr); \
return rslt; \
} \
\
NS_IMETHODIMP_(nsrefcnt) \
_class::AddRef(void) \
{ \
++mRefCnt; /* keep track of our refcount as well as outer's */ \
if (fOuter) \
return fOuter->AddRef(); \
else \
return ++mRefCnt; \
return mRefCnt; \
} \
\
NS_IMETHODIMP_(nsrefcnt) \
_class::Release(void) \
{ \
if (fOuter) \
return fOuter->Release(); \
if (fOuter) { \
nsISupports* outer = fOuter; /* in case we release ourself */ \
nsIOuter* outerIntf; \
static NS_DEFINE_IID(kIOuterIID, NS_IOUTER_IID); \
if (mRefCnt == 1 && \
outer->QueryInterface(kIOuterIID, \
(void**)&outerIntf) == NS_OK) { \
outerIntf->ReleaseInner(GetInner()); \
outerIntf->Release(); \
} \
else \
--mRefCnt; /* keep track of our refcount as well as outer's */ \
return outer->Release(); \
} \
else { \
if (--mRefCnt == 0) { \
delete this; \