mirror of
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125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsAsyncRedirectVerifyHelper_h
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#define nsAsyncRedirectVerifyHelper_h
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#include "nsIRunnable.h"
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#include "nsIThread.h"
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#include "nsIChannelEventSink.h"
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#include "nsIInterfaceRequestor.h"
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#include "nsIAsyncVerifyRedirectCallback.h"
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#include "nsCOMPtr.h"
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#include "nsAutoPtr.h"
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#include "nsCycleCollectionParticipant.h"
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#include "mozilla/Attributes.h"
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class nsIChannel;
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/**
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* This class simplifies call of OnChannelRedirect of IOService and
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* the sink bound with the channel being redirected while the result of
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* redirect decision is returned through the callback.
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*/
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class nsAsyncRedirectVerifyHelper final : public nsIRunnable,
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public nsIAsyncVerifyRedirectCallback
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{
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIRUNNABLE
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NS_DECL_NSIASYNCVERIFYREDIRECTCALLBACK
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public:
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nsAsyncRedirectVerifyHelper();
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/*
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* Calls AsyncOnChannelRedirect() on the given sink with the given
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* channels and flags. Keeps track of number of async callbacks to expect.
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*/
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nsresult DelegateOnChannelRedirect(nsIChannelEventSink *sink,
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nsIChannel *oldChannel,
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nsIChannel *newChannel,
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uint32_t flags);
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/**
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* Initialize and run the chain of AsyncOnChannelRedirect calls. OldChannel
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* is QI'ed for nsIAsyncVerifyRedirectCallback. The result of the redirect
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* decision is passed through this interface back to the oldChannel.
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*
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* @param oldChan
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* channel being redirected, MUST implement
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* nsIAsyncVerifyRedirectCallback
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* @param newChan
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* target of the redirect channel
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* @param flags
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* redirect flags
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* @param synchronize
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* set to TRUE if you want the Init method wait synchronously for
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* all redirect callbacks
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*/
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nsresult Init(nsIChannel* oldChan,
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nsIChannel* newChan,
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uint32_t flags,
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bool synchronize = false);
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protected:
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nsCOMPtr<nsIChannel> mOldChan;
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nsCOMPtr<nsIChannel> mNewChan;
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uint32_t mFlags;
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bool mWaitingForRedirectCallback;
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nsCOMPtr<nsIThread> mCallbackThread;
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bool mCallbackInitiated;
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int32_t mExpectedCallbacks;
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nsresult mResult; // value passed to callback
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void InitCallback();
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/**
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* Calls back to |oldChan| as described in Init()
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*/
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void ExplicitCallback(nsresult result);
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private:
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~nsAsyncRedirectVerifyHelper();
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bool IsOldChannelCanceled();
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};
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/*
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* Helper to make the call-stack handle some control-flow for us
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*/
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class nsAsyncRedirectAutoCallback
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{
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public:
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explicit nsAsyncRedirectAutoCallback(nsIAsyncVerifyRedirectCallback* aCallback)
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: mCallback(aCallback)
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{
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mResult = NS_OK;
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}
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~nsAsyncRedirectAutoCallback()
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{
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if (mCallback)
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mCallback->OnRedirectVerifyCallback(mResult);
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}
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/*
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* Call this is you want it to call back with a different result-code
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*/
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void SetResult(nsresult aRes)
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{
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mResult = aRes;
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}
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/*
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* Call this is you want to avoid the callback
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*/
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void DontCallback()
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{
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mCallback = nullptr;
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}
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private:
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nsIAsyncVerifyRedirectCallback* mCallback;
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nsresult mResult;
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};
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#endif
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