/usr/include/thunderbird/CryptoTask.h is in thunderbird-dev 1:24.4.0+build1-0ubuntu1.
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/* vim: set ts=2 et sw=2 tw=80: */
/* 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 mozilla__CryptoTask_h
#define mozilla__CryptoTask_h
#include "mozilla/Attributes.h"
#include "nsThreadUtils.h"
#include "nsNSSShutDown.h"
namespace mozilla {
/**
* Frequently we need to run a task on a background thread without blocking
* the main thread, and then call a callback on the main thread with the
* result. This class provides the framework for that. Subclasses must:
*
* (1) Override CalculateResult for the off-the-main-thread computation.
* NSS functionality may only be accessed within CalculateResult.
* (2) Override ReleaseNSSResources to release references to all NSS
* resources (that do implement nsNSSShutDownObject themselves).
* (3) Override CallCallback() for the on-the-main-thread call of the
* callback.
*
* CalculateResult, ReleaseNSSResources, and CallCallback are called in order,
* except CalculateResult might be skipped if NSS is shut down before it can
* be called; in that case ReleaseNSSResources will be called and then
* CallCallback will be called with an error code.
*/
class CryptoTask : public nsRunnable,
public nsNSSShutDownObject
{
public:
template <size_t LEN>
nsresult Dispatch(const char (&taskThreadName)[LEN])
{
MOZ_STATIC_ASSERT(LEN <= 15,
"Thread name must be no more than 15 characters");
return Dispatch(nsDependentCString(taskThreadName));
}
protected:
CryptoTask()
: mRv(NS_ERROR_NOT_INITIALIZED),
mReleasedNSSResources(false)
{
}
virtual ~CryptoTask();
/**
* Called on a background thread (never the main thread). If CalculateResult
* is called, then its result will be passed to CallCallback on the main
* thread.
*/
virtual nsresult CalculateResult() = 0;
/**
* Called on the main thread during NSS shutdown or just before CallCallback
* has been called. All NSS resources must be released. Usually, this just
* means assigning nullptr to the ScopedNSSType-based memory variables.
*/
virtual void ReleaseNSSResources() = 0;
/**
* Called on the main thread with the result from CalculateResult() or
* with an error code if NSS was shut down before CalculateResult could
* be called.
*/
virtual void CallCallback(nsresult rv) = 0;
private:
NS_IMETHOD Run() MOZ_OVERRIDE MOZ_FINAL;
virtual void virtualDestroyNSSReference() MOZ_OVERRIDE MOZ_FINAL;
nsresult Dispatch(const nsACString & taskThreadName);
nsresult mRv;
bool mReleasedNSSResources;
};
} // namespace mozilla
#endif // mozilla__CryptoTask_h
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