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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* 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 _nsCacheRequest_h_
#define _nsCacheRequest_h_
#include "nspr.h"
#include "mozilla/CondVar.h"
#include "mozilla/Mutex.h"
#include "nsCOMPtr.h"
#include "nsICache.h"
#include "nsICacheListener.h"
#include "nsCacheSession.h"
#include "nsCacheService.h"
class nsCacheRequest : public PRCList
{
typedef mozilla::CondVar CondVar;
typedef mozilla::MutexAutoLock MutexAutoLock;
typedef mozilla::Mutex Mutex;
private:
friend class nsCacheService;
friend class nsCacheEntry;
friend class nsProcessRequestEvent;
nsCacheRequest( const nsACString & key,
nsICacheListener * listener,
nsCacheAccessMode accessRequested,
bool blockingMode,
nsCacheSession * session)
: mKey(key),
mInfo(0),
mListener(listener),
mLock("nsCacheRequest.mLock"),
mCondVar(mLock, "nsCacheRequest.mCondVar"),
mProfileDir(session->ProfileDir())
{
MOZ_COUNT_CTOR(nsCacheRequest);
PR_INIT_CLIST(this);
SetAccessRequested(accessRequested);
SetStoragePolicy(session->StoragePolicy());
if (session->IsStreamBased()) MarkStreamBased();
if (session->WillDoomEntriesIfExpired()) MarkDoomEntriesIfExpired();
if (session->IsPrivate()) MarkPrivate();
if (blockingMode == nsICache::BLOCKING) MarkBlockingMode();
MarkWaitingForValidation();
NS_IF_ADDREF(mListener);
}
~nsCacheRequest()
{
MOZ_COUNT_DTOR(nsCacheRequest);
NS_ASSERTION(PR_CLIST_IS_EMPTY(this), "request still on a list");
if (mListener)
nsCacheService::ReleaseObject_Locked(mListener, mThread);
}
/**
* Simple Accessors
*/
enum CacheRequestInfo {
eStoragePolicyMask = 0x000000FF,
eStreamBasedMask = 0x00000100,
ePrivateMask = 0x00000200,
eDoomEntriesIfExpiredMask = 0x00001000,
eBlockingModeMask = 0x00010000,
eWaitingForValidationMask = 0x00100000,
eAccessRequestedMask = 0xFF000000
};
void SetAccessRequested(nsCacheAccessMode mode)
{
NS_ASSERTION(mode <= 0xFF, "too many bits in nsCacheAccessMode");
mInfo &= ~eAccessRequestedMask;
mInfo |= mode << 24;
}
nsCacheAccessMode AccessRequested()
{
return (nsCacheAccessMode)((mInfo >> 24) & 0xFF);
}
void MarkStreamBased() { mInfo |= eStreamBasedMask; }
bool IsStreamBased() { return (mInfo & eStreamBasedMask) != 0; }
void MarkDoomEntriesIfExpired() { mInfo |= eDoomEntriesIfExpiredMask; }
bool WillDoomEntriesIfExpired() { return (0 != (mInfo & eDoomEntriesIfExpiredMask)); }
void MarkBlockingMode() { mInfo |= eBlockingModeMask; }
bool IsBlocking() { return (0 != (mInfo & eBlockingModeMask)); }
bool IsNonBlocking() { return !(mInfo & eBlockingModeMask); }
void SetStoragePolicy(nsCacheStoragePolicy policy)
{
NS_ASSERTION(policy <= 0xFF, "too many bits in nsCacheStoragePolicy");
mInfo &= ~eStoragePolicyMask; // clear storage policy bits
mInfo |= policy; // or in new bits
}
nsCacheStoragePolicy StoragePolicy()
{
return (nsCacheStoragePolicy)(mInfo & eStoragePolicyMask);
}
void MarkPrivate() { mInfo |= ePrivateMask; }
void MarkPublic() { mInfo &= ~ePrivateMask; }
bool IsPrivate() { return (mInfo & ePrivateMask) != 0; }
void MarkWaitingForValidation() { mInfo |= eWaitingForValidationMask; }
void DoneWaitingForValidation() { mInfo &= ~eWaitingForValidationMask; }
bool WaitingForValidation()
{
return (mInfo & eWaitingForValidationMask) != 0;
}
nsresult
WaitForValidation(void)
{
if (!WaitingForValidation()) { // flag already cleared
MarkWaitingForValidation(); // set up for next time
return NS_OK; // early exit;
}
{
MutexAutoLock lock(mLock);
while (WaitingForValidation()) {
mCondVar.Wait();
}
MarkWaitingForValidation(); // set up for next time
}
return NS_OK;
}
void WakeUp(void) {
DoneWaitingForValidation();
MutexAutoLock lock(mLock);
mCondVar.Notify();
}
/**
* Data members
*/
nsCString mKey;
uint32_t mInfo;
nsICacheListener * mListener; // strong ref
nsCOMPtr<nsIThread> mThread;
Mutex mLock;
CondVar mCondVar;
nsCOMPtr<nsIFile> mProfileDir;
};
#endif // _nsCacheRequest_h_
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