109 lines
3.6 KiB
C++
109 lines
3.6 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_ANDROID_H_
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#define BASE_MESSAGE_LOOP_MESSAGE_PUMP_ANDROID_H_
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#include <jni.h>
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#include <memory>
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#include "base/android/scoped_java_ref.h"
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#include "base/base_export.h"
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#include "base/callback.h"
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#include "base/compiler_specific.h"
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#include "base/macros.h"
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#include "base/message_loop/message_pump.h"
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#include "base/optional.h"
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#include "base/time/time.h"
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struct ALooper;
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namespace base {
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class RunLoop;
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// This class implements a MessagePump needed for TYPE_UI MessageLoops on
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// OS_ANDROID platform.
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class BASE_EXPORT MessagePumpForUI : public MessagePump {
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public:
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MessagePumpForUI();
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~MessagePumpForUI() override;
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void Run(Delegate* delegate) override;
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void Quit() override;
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void ScheduleWork() override;
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void ScheduleDelayedWork(const TimeTicks& delayed_work_time) override;
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// Attaches |delegate| to this native MessagePump. |delegate| will from then
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// on be invoked by the native loop to process application tasks.
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virtual void Attach(Delegate* delegate);
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// We call Abort when there is a pending JNI exception, meaning that the
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// current thread will crash when we return to Java.
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// We can't call any JNI-methods before returning to Java as we would then
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// cause a native crash (instead of the original Java crash).
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void Abort() { should_abort_ = true; }
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bool IsAborted() { return should_abort_; }
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bool ShouldQuit() const { return should_abort_ || quit_; }
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// Tells the RunLoop to quit when idle, calling the callback when it's safe
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// for the Thread to stop.
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void QuitWhenIdle(base::OnceClosure callback);
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// These functions are only public so that the looper callbacks can call them,
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// and should not be called from outside this class.
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void OnDelayedLooperCallback();
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void OnNonDelayedLooperCallback();
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protected:
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void SetDelegate(Delegate* delegate) { delegate_ = delegate; }
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virtual bool IsTestImplementation() const;
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private:
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void DoIdleWork();
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// Unlike other platforms, we don't control the message loop as it's
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// controlled by the Android Looper, so we can't run a RunLoop to keep the
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// Thread this pump belongs to alive. However, threads are expected to have an
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// active run loop, so we manage a RunLoop internally here, starting/stopping
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// it as necessary.
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std::unique_ptr<RunLoop> run_loop_;
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// See Abort().
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bool should_abort_ = false;
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// Whether this message pump is quitting, or has quit.
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bool quit_ = false;
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// The MessageLoop::Delegate for this pump.
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Delegate* delegate_ = nullptr;
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// The time at which we are currently scheduled to wake up and perform a
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// delayed task. This avoids redundantly scheduling |delayed_fd_| with the
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// same timeout when subsequent work phases all go idle on the same pending
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// delayed task; nullopt if no wakeup is currently scheduled.
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Optional<TimeTicks> delayed_scheduled_time_;
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// If set, a callback to fire when the message pump is quit.
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base::OnceClosure on_quit_callback_;
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// The file descriptor used to signal that non-delayed work is available.
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int non_delayed_fd_;
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// The file descriptor used to signal that delayed work is available.
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int delayed_fd_;
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// The Android Looper for this thread.
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ALooper* looper_ = nullptr;
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// The JNIEnv* for this thread, used to check for pending exceptions.
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JNIEnv* env_;
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DISALLOW_COPY_AND_ASSIGN(MessagePumpForUI);
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};
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} // namespace base
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#endif // BASE_MESSAGE_LOOP_MESSAGE_PUMP_ANDROID_H_
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