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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// ForceTLSState maintains an in memory database containing the list of hosts
// that currently have ForceTLS enabled. This singleton object deals with
// writing that data out to disk as needed and loading it at startup.
// At startup we need to load the ForceTLS state from the disk. For the moment,
// we don't want to delay startup for this load, so we let the ForceTLSState
// run for a while without being loaded. This means that it's possible for
// pages opened very quickly not to get the correct ForceTLS information.
//
// To load the state, we schedule a Task on the file thread which loads,
// deserialises and configures the ForceTLSState.
//
// The ForceTLSState object supports running a callback function when it
// changes. This object registers the callback, pointing at itself.
//
// ForceTLSState calls...
// ForceTLSPersister::StateIsDirty
// since the callback isn't allowed to block or reenter, we schedule a Task
// on |file_thread_| after some small amount of time
//
// ...
//
// ForceTLSPersister::SerialiseState
// copies the current state of the ForceTLSState, serialises and writes to
// disk.
#include "base/lock.h"
#include "base/ref_counted.h"
#include "net/base/force_tls_state.h"
namespace base {
class Thread;
}
class ForceTLSPersister : public base::RefCountedThreadSafe<ForceTLSPersister>,
public net::ForceTLSState::Delegate {
public:
ForceTLSPersister(net::ForceTLSState* state, base::Thread* file_thread);
// Called by the ForceTLSState when it changes its state.
virtual void StateIsDirty(net::ForceTLSState*);
private:
// a Task callback for when the state needs to be written out.
void SerialiseState();
// a Task callback for when the state needs to be loaded from disk at startup.
void LoadState();
Lock lock_; // protects all the members
// true when the state object has signaled that we're dirty and we haven't
// serialised the state yet.
bool state_is_dirty_;
scoped_refptr<net::ForceTLSState> force_tls_state_;
// This is a thread which can perform file access.
base::Thread* const file_thread_;
};
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