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// Copyright 2013 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.
#ifndef CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_OBSERVER_H_
#define CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_OBSERVER_H_
#include "base/process/kill.h"
#include "base/process/process_handle.h"
#include "content/common/content_export.h"
namespace content {
class RenderProcessHost;
// An observer API implemented by classes which are interested
// in RenderProcessHost lifecycle events.
class CONTENT_EXPORT RenderProcessHostObserver {
public:
// This method is invoked when the process is going to exit and should not be
// used for further navigations. Note that this is a COURTESY callback, not
// guaranteed to be called for any particular process. Because this is the
// first step in an orderly shutdown of a render process, do not expect that
// a new render process will be hosted with this RenderProcessHost.
virtual void RenderProcessWillExit(RenderProcessHost* host) {}
// This method is invoked when the process of the observed RenderProcessHost
// exits (either normally or with a crash). To determine if the process closed
// normally or crashed, examine the |status| parameter.
//
// A new render process may be spawned for this RenderProcessHost, but there
// are no guarantees (e.g. if shutdown is occurring, the HostDestroyed
// callback will happen soon and that will be it, but if the renderer crashed
// and the user clicks 'reload', a new render process will be spawned).
//
// This will cause a call to WebContentsObserver::RenderProcessGone() for the
// active renderer process for the top-level frame; for code that needs to be
// a WebContentsObserver anyway, consider whether that API might be a better
// choice.
virtual void RenderProcessExited(RenderProcessHost* host,
base::TerminationStatus status,
int exit_code) {}
// This method is invoked when the observed RenderProcessHost itself is
// destroyed. This is guaranteed to be the last call made to the observer, so
// if the observer is tied to the observed RenderProcessHost, it is safe to
// delete it.
virtual void RenderProcessHostDestroyed(RenderProcessHost* host) {}
protected:
virtual ~RenderProcessHostObserver() {}
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_OBSERVER_H_
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