| // 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. |
| |
| package org.chromium.base; |
| |
| import android.os.Handler; |
| import android.os.Message; |
| import android.os.SystemClock; |
| |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| class SystemMessageHandler extends Handler { |
| |
| private static final int TIMER_MESSAGE = 1; |
| private static final int DELAYED_TIMER_MESSAGE = 2; |
| |
| // Native class pointer set by the constructor of the SharedClient native class. |
| private int mMessagePumpDelegateNative = 0; |
| |
| // Used to ensure we have at most one TIMER_MESSAGE pending at once. |
| private AtomicBoolean mTimerFired = new AtomicBoolean(true); |
| |
| // Used to insert TIMER_MESSAGE on the front of the system message queue during startup only. |
| // This is a wee hack, to give a priority boost to native tasks during startup as they tend to |
| // be on the critical path. (After startup, handling the UI with minimum latency is more |
| // important). |
| private boolean mStartupComplete = false; |
| private final long mStartupCompleteTime = System.currentTimeMillis() + 2000; |
| private final boolean startupComplete() { |
| if (!mStartupComplete && System.currentTimeMillis() > mStartupCompleteTime) { |
| mStartupComplete = true; |
| } |
| return mStartupComplete; |
| } |
| |
| private SystemMessageHandler(int messagePumpDelegateNative) { |
| mMessagePumpDelegateNative = messagePumpDelegateNative; |
| } |
| |
| @Override |
| public void handleMessage(Message msg) { |
| if (msg.what == TIMER_MESSAGE) { |
| mTimerFired.set(true); |
| } |
| while (nativeDoRunLoopOnce(mMessagePumpDelegateNative)) { |
| if (startupComplete()) { |
| setTimer(); |
| break; |
| } |
| } |
| } |
| |
| @CalledByNative |
| private void setTimer() { |
| if (!mTimerFired.getAndSet(false)) { |
| // mTimerFired was already false. |
| return; |
| } |
| if (startupComplete()) { |
| sendEmptyMessage(TIMER_MESSAGE); |
| } else { |
| sendMessageAtFrontOfQueue(obtainMessage(TIMER_MESSAGE)); |
| } |
| } |
| |
| // If millis <=0, it'll send a TIMER_MESSAGE instead of |
| // a DELAYED_TIMER_MESSAGE. |
| @SuppressWarnings("unused") |
| @CalledByNative |
| private void setDelayedTimer(long millis) { |
| if (millis <= 0) { |
| setTimer(); |
| } else { |
| removeMessages(DELAYED_TIMER_MESSAGE); |
| sendEmptyMessageDelayed(DELAYED_TIMER_MESSAGE, millis); |
| } |
| } |
| |
| @SuppressWarnings("unused") |
| @CalledByNative |
| private void removeTimer() { |
| removeMessages(TIMER_MESSAGE); |
| removeMessages(DELAYED_TIMER_MESSAGE); |
| } |
| |
| @CalledByNative |
| private static SystemMessageHandler create(int messagePumpDelegateNative) { |
| return new SystemMessageHandler(messagePumpDelegateNative); |
| } |
| |
| private native boolean nativeDoRunLoopOnce(int messagePumpDelegateNative); |
| } |