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// Copyright (c) 2012 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.
//
// A thin wrapper around buzz::XmppClient that exposes weak pointers
// so that users know when the buzz::XmppClient becomes invalid to use
// (not necessarily only at destruction time).
#ifndef JINGLE_NOTIFIER_BASE_WEAK_XMPP_CLIENT_H_
#define JINGLE_NOTIFIER_BASE_WEAK_XMPP_CLIENT_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "talk/xmpp/xmppclient.h"
namespace talk_base {
class TaskParent;
} // namespace
namespace notifier {
// buzz::XmppClient's destructor isn't marked virtual, but it inherits
// from talk_base::Task, whose destructor *is* marked virtual, so we
// can safely inherit from it.
class WeakXmppClient : public buzz::XmppClient, public base::NonThreadSafe {
public:
explicit WeakXmppClient(talk_base::TaskParent* parent);
virtual ~WeakXmppClient();
// Returns a weak pointer that is invalidated when the XmppClient
// becomes invalid to use.
base::WeakPtr<WeakXmppClient> AsWeakPtr();
// Invalidates all weak pointers to this object. (This method is
// necessary as calling Abort() does not always lead to Stop() being
// called, so it's not a reliable way to cause an invalidation.)
void Invalidate();
protected:
virtual void Stop() OVERRIDE;
private:
// We use our own WeakPtrFactory instead of inheriting from
// SupportsWeakPtr since we want to invalidate in other places
// besides the destructor.
base::WeakPtrFactory<WeakXmppClient> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(WeakXmppClient);
};
} // namespace notifier
#endif // JINGLE_NOTIFIER_BASE_WEAK_XMPP_CLIENT_H_
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