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// Copyright 2013 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_BROWSER_CHROME_PROCESS_SINGLETON_H_
#define CHROME_BROWSER_CHROME_PROCESS_SINGLETON_H_
#include "base/files/file_path.h"
#include "base/functional/callback.h"
#include "chrome/browser/process_singleton.h"
#include "chrome/browser/process_singleton_startup_lock.h"
// Composes a `ProcessSingleton` with a `ProcessSingletonStartupLock`.
//
// Notifications from `ProcessSingleton` will be queued up until `Unlock()` is
// called. Once unlocked, notifications will be passed to the
// `NotificationCallback` passed to `Unlock()`.
class ChromeProcessSingleton {
public:
explicit ChromeProcessSingleton(const base::FilePath& user_data_dir);
ChromeProcessSingleton(const ChromeProcessSingleton&) = delete;
ChromeProcessSingleton& operator=(const ChromeProcessSingleton&) = delete;
~ChromeProcessSingleton();
// Notify another process, if available. Otherwise sets ourselves as the
// singleton instance. Returns PROCESS_NONE if we became the singleton
// instance. Callers are guaranteed to either have notified an existing
// process or have grabbed the singleton (unless the profile is locked by an
// unreachable process).
ProcessSingleton::NotifyResult NotifyOtherProcessOrCreate();
// Start watching for notifications from other processes. After this call,
// the notifications sent by other process can be processed. This call
// requires the browser threads (UI / IO) to be created. Requests that occur
// before calling StartWatching(...) will be blocked and may timeout.
void StartWatching();
// Clear any lock state during shutdown.
void Cleanup();
// Executes previously queued command-line invocations and allows future
// invocations to be executed immediately.
// This only has an effect the first time it is called.
void Unlock(
const ProcessSingleton::NotificationCallback& notification_callback);
bool IsSingletonInstanceForTesting() const { return is_singleton_instance_; }
#if BUILDFLAG(IS_WIN)
// Must only be called both after initialization of FeatureList and
// NotifyOtherProcessOrCreate().
void InitializeFeatures();
#endif
// Create the chrome process singleton instance for the current process.
static void CreateInstance(const base::FilePath& user_data_dir);
// Delete the chrome process singleton instance.
static void DeleteInstance();
// Retrieve the chrome process singleton instance for the current process.
static ChromeProcessSingleton* GetInstance();
// Returns true if this process is the singleton instance (i.e., a
// ProcessSingleton has been created and NotifyOtherProcessOrCreate() has
// returned PROCESS_NONE).
static bool IsSingletonInstance();
private:
bool NotificationCallback(base::CommandLine command_line,
const base::FilePath& current_directory);
// Whether or not this instance is the running single instance.
bool is_singleton_instance_ = false;
// We compose these two locks with the client-supplied notification callback.
// First |modal_dialog_lock_| will discard any notifications that arrive while
// a modal dialog is active. Otherwise, it will pass the notification to
// |startup_lock_|, which will queue notifications until |Unlock()| is called.
// Notifications passing through both locks are finally delivered to our
// client.
ProcessSingletonStartupLock startup_lock_;
// The basic ProcessSingleton
ProcessSingleton process_singleton_;
ProcessSingleton::NotificationCallback notification_callback_;
};
#endif // CHROME_BROWSER_CHROME_PROCESS_SINGLETON_H_
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