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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_WINDOWS_SERVICES_ELEVATED_TRACING_SERVICE_SESSION_REGISTRY_H_
#define CHROME_WINDOWS_SERVICES_ELEVATED_TRACING_SERVICE_SESSION_REGISTRY_H_
#include <unknwn.h>
#include <atomic>
#include <memory>
#include "base/functional/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_refptr.h"
#include "base/process/process.h"
#include "chrome/windows_services/elevated_tracing_service/process_watcher.h"
namespace elevated_tracing_service {
// A registry of active tracing sessions that allows only a single instance to
// be active at a time and monitors that session's client for termination.
class SessionRegistry : public base::RefCountedThreadSafe<SessionRegistry> {
public:
class ScopedSession {
public:
ScopedSession(const ScopedSession&) = delete;
ScopedSession& operator=(const ScopedSession&) = delete;
~ScopedSession();
private:
friend class SessionRegistry;
ScopedSession(base::Process client_process,
base::OnceClosure on_session_destroyed,
base::OnceClosure on_client_terminated);
ProcessWatcher client_process_watcher_;
base::OnceClosure on_session_destroyed_;
};
// Constructs the process-global registry.
SessionRegistry();
SessionRegistry(const SessionRegistry&) = delete;
SessionRegistry& operator=(const SessionRegistry&) = delete;
// Registers `session`, being used by `client_process`, as the single active
// session. Returns a scoper to be destroyed along with the session, or null
// if there already is an active session. This is called on an arbitrary RPC
// thread.
static std::unique_ptr<ScopedSession> RegisterActiveSession(
IUnknown* session,
base::Process client_process);
// Sets a closure to be run (on an arbitrary thread) when the active session
// is cleared.
void SetSessionClearedClosureForTesting(base::OnceClosure on_session_cleared);
private:
class SessionCore;
friend class ScopedSession;
friend class base::RefCountedThreadSafe<SessionRegistry>;
~SessionRegistry();
// Called upon destruction of a session (on an arbitrary RPC thread).
void OnSessionDestroyed(scoped_refptr<SessionCore> core);
// Called after termination of the client process associated with a session
// (on an arbitrary thread pool thread).
void OnClientTerminated(scoped_refptr<SessionCore> core);
// Clears the active session following either its destruction or termination
// of the client.
void ClearActiveSession(SessionCore* core);
std::atomic<SessionCore*> active_session_ = nullptr;
// An optional closure to be run (on an arbitrary thread) when the active
// session is cleared.
base::OnceClosure on_session_cleared_;
};
} // namespace elevated_tracing_service
#endif // CHROME_WINDOWS_SERVICES_ELEVATED_TRACING_SERVICE_SESSION_REGISTRY_H_
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