Jaewan Kim | 6346155 | 2014-03-10 17:10:51 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server.net; |
| 18 | |
| 19 | import android.os.Handler; |
| 20 | import android.os.HandlerThread; |
| 21 | import android.text.TextUtils; |
| 22 | import android.util.Log; |
| 23 | |
| 24 | import java.io.BufferedOutputStream; |
| 25 | import java.io.DataOutputStream; |
| 26 | import java.io.FileOutputStream; |
| 27 | import java.io.IOException; |
| 28 | |
| 29 | public class DelayedDiskWrite { |
| 30 | private HandlerThread mDiskWriteHandlerThread; |
| 31 | private Handler mDiskWriteHandler; |
| 32 | /* Tracks multiple writes on the same thread */ |
| 33 | private int mWriteSequence = 0; |
| 34 | private final String TAG = "DelayedDiskWrite"; |
| 35 | |
| 36 | public interface Writer { |
| 37 | public void onWriteCalled(DataOutputStream out) throws IOException; |
| 38 | } |
| 39 | |
| 40 | public void write(final String filePath, final Writer w) { |
Jan Nordqvist | e5779d7 | 2015-04-23 15:42:55 -0700 | [diff] [blame] | 41 | write(filePath, w, true); |
| 42 | } |
| 43 | |
| 44 | public void write(final String filePath, final Writer w, final boolean open) { |
Jaewan Kim | 6346155 | 2014-03-10 17:10:51 +0900 | [diff] [blame] | 45 | if (TextUtils.isEmpty(filePath)) { |
| 46 | throw new IllegalArgumentException("empty file path"); |
| 47 | } |
| 48 | |
| 49 | /* Do a delayed write to disk on a separate handler thread */ |
| 50 | synchronized (this) { |
| 51 | if (++mWriteSequence == 1) { |
| 52 | mDiskWriteHandlerThread = new HandlerThread("DelayedDiskWriteThread"); |
| 53 | mDiskWriteHandlerThread.start(); |
| 54 | mDiskWriteHandler = new Handler(mDiskWriteHandlerThread.getLooper()); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | mDiskWriteHandler.post(new Runnable() { |
| 59 | @Override |
| 60 | public void run() { |
Jan Nordqvist | e5779d7 | 2015-04-23 15:42:55 -0700 | [diff] [blame] | 61 | doWrite(filePath, w, open); |
Jaewan Kim | 6346155 | 2014-03-10 17:10:51 +0900 | [diff] [blame] | 62 | } |
| 63 | }); |
| 64 | } |
| 65 | |
Jan Nordqvist | e5779d7 | 2015-04-23 15:42:55 -0700 | [diff] [blame] | 66 | private void doWrite(String filePath, Writer w, boolean open) { |
Jaewan Kim | 6346155 | 2014-03-10 17:10:51 +0900 | [diff] [blame] | 67 | DataOutputStream out = null; |
| 68 | try { |
Jan Nordqvist | e5779d7 | 2015-04-23 15:42:55 -0700 | [diff] [blame] | 69 | if (open) { |
| 70 | out = new DataOutputStream(new BufferedOutputStream( |
Jaewan Kim | 6346155 | 2014-03-10 17:10:51 +0900 | [diff] [blame] | 71 | new FileOutputStream(filePath))); |
Jan Nordqvist | e5779d7 | 2015-04-23 15:42:55 -0700 | [diff] [blame] | 72 | } |
Jaewan Kim | 6346155 | 2014-03-10 17:10:51 +0900 | [diff] [blame] | 73 | w.onWriteCalled(out); |
| 74 | } catch (IOException e) { |
| 75 | loge("Error writing data file " + filePath); |
| 76 | } finally { |
| 77 | if (out != null) { |
| 78 | try { |
| 79 | out.close(); |
| 80 | } catch (Exception e) {} |
| 81 | } |
| 82 | |
| 83 | // Quit if no more writes sent |
| 84 | synchronized (this) { |
| 85 | if (--mWriteSequence == 0) { |
| 86 | mDiskWriteHandler.getLooper().quit(); |
| 87 | mDiskWriteHandler = null; |
| 88 | mDiskWriteHandlerThread = null; |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | private void loge(String s) { |
| 95 | Log.e(TAG, s); |
| 96 | } |
| 97 | } |
| 98 | |