Daichi Hirono | fda7474 | 2016-02-01 13:00:31 +0900 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2016 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 | |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 17 | package com.android.mtp; |
| 18 | |
| 19 | import android.content.ContentResolver; |
Daichi Hirono | dc47344 | 2015-11-13 15:42:28 +0900 | [diff] [blame] | 20 | import android.content.res.Resources; |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 21 | import android.net.Uri; |
| 22 | import android.os.Process; |
| 23 | import android.provider.DocumentsContract; |
| 24 | import android.util.Log; |
| 25 | |
Daichi Hirono | fda7474 | 2016-02-01 13:00:31 +0900 | [diff] [blame^] | 26 | import java.util.concurrent.CountDownLatch; |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 27 | import java.util.concurrent.ExecutorService; |
| 28 | import java.util.concurrent.Executors; |
| 29 | import java.util.concurrent.FutureTask; |
| 30 | import java.util.concurrent.TimeUnit; |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 31 | |
| 32 | final class RootScanner { |
| 33 | /** |
| 34 | * Polling interval in milliseconds used for first SHORT_POLLING_TIMES because it is more |
| 35 | * likely to add new root just after the device is added. |
| 36 | */ |
| 37 | private final static long SHORT_POLLING_INTERVAL = 2000; |
| 38 | |
| 39 | /** |
| 40 | * Polling interval in milliseconds for low priority polling, when changes are not expected. |
| 41 | */ |
| 42 | private final static long LONG_POLLING_INTERVAL = 30 * 1000; |
| 43 | |
| 44 | /** |
| 45 | * @see #SHORT_POLLING_INTERVAL |
| 46 | */ |
| 47 | private final static long SHORT_POLLING_TIMES = 10; |
| 48 | |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 49 | /** |
| 50 | * Milliseconds we wait for background thread when pausing. |
| 51 | */ |
| 52 | private final static long AWAIT_TERMINATION_TIMEOUT = 2000; |
| 53 | |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 54 | final ContentResolver mResolver; |
Daichi Hirono | dc47344 | 2015-11-13 15:42:28 +0900 | [diff] [blame] | 55 | final Resources mResources; |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 56 | final MtpManager mManager; |
Daichi Hirono | dc47344 | 2015-11-13 15:42:28 +0900 | [diff] [blame] | 57 | final MtpDatabase mDatabase; |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 58 | |
| 59 | ExecutorService mExecutor; |
| 60 | FutureTask<Void> mCurrentTask; |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 61 | |
Daichi Hirono | dc47344 | 2015-11-13 15:42:28 +0900 | [diff] [blame] | 62 | RootScanner( |
| 63 | ContentResolver resolver, |
| 64 | Resources resources, |
| 65 | MtpManager manager, |
| 66 | MtpDatabase database) { |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 67 | mResolver = resolver; |
Daichi Hirono | dc47344 | 2015-11-13 15:42:28 +0900 | [diff] [blame] | 68 | mResources = resources; |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 69 | mManager = manager; |
Daichi Hirono | dc47344 | 2015-11-13 15:42:28 +0900 | [diff] [blame] | 70 | mDatabase = database; |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 71 | } |
| 72 | |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 73 | /** |
| 74 | * Notifies a change of the roots list via ContentResolver. |
| 75 | */ |
Daichi Hirono | dc47344 | 2015-11-13 15:42:28 +0900 | [diff] [blame] | 76 | void notifyChange() { |
| 77 | final Uri uri = |
| 78 | DocumentsContract.buildRootsUri(MtpDocumentsProvider.AUTHORITY); |
| 79 | mResolver.notifyChange(uri, null, false); |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Starts to check new changes right away. |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 84 | */ |
Daichi Hirono | fda7474 | 2016-02-01 13:00:31 +0900 | [diff] [blame^] | 85 | synchronized CountDownLatch resume() { |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 86 | if (mExecutor == null) { |
| 87 | // Only single thread updates the database. |
| 88 | mExecutor = Executors.newSingleThreadExecutor(); |
| 89 | } |
| 90 | if (mCurrentTask != null) { |
| 91 | // Cancel previous task. |
| 92 | mCurrentTask.cancel(true); |
| 93 | } |
Daichi Hirono | fda7474 | 2016-02-01 13:00:31 +0900 | [diff] [blame^] | 94 | final UpdateRootsRunnable runnable = new UpdateRootsRunnable(); |
| 95 | mCurrentTask = new FutureTask<Void>(runnable, null); |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 96 | mExecutor.submit(mCurrentTask); |
Daichi Hirono | fda7474 | 2016-02-01 13:00:31 +0900 | [diff] [blame^] | 97 | return runnable.mFirstScanCompleted; |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Stops background thread and wait for its termination. |
| 102 | * @throws InterruptedException |
| 103 | */ |
| 104 | synchronized void pause() throws InterruptedException { |
| 105 | if (mExecutor == null) { |
Daichi Hirono | dc47344 | 2015-11-13 15:42:28 +0900 | [diff] [blame] | 106 | return; |
| 107 | } |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 108 | mExecutor.shutdownNow(); |
| 109 | if (!mExecutor.awaitTermination(AWAIT_TERMINATION_TIMEOUT, TimeUnit.MILLISECONDS)) { |
| 110 | Log.e(MtpDocumentsProvider.TAG, "Failed to terminate RootScanner's background thread."); |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 111 | } |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 112 | mExecutor = null; |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 113 | } |
| 114 | |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 115 | /** |
| 116 | * Runnable to scan roots and update the database information. |
| 117 | */ |
| 118 | private final class UpdateRootsRunnable implements Runnable { |
Daichi Hirono | fda7474 | 2016-02-01 13:00:31 +0900 | [diff] [blame^] | 119 | final CountDownLatch mFirstScanCompleted = new CountDownLatch(1); |
| 120 | |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 121 | @Override |
| 122 | public void run() { |
| 123 | Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND); |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 124 | int pollingCount = 0; |
Daichi Hirono | 2bdb388 | 2015-12-22 12:57:47 +0900 | [diff] [blame] | 125 | while (true) { |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 126 | boolean changed = false; |
Daichi Hirono | b3fe72b | 2015-12-15 07:45:06 +0000 | [diff] [blame] | 127 | |
| 128 | // Update devices. |
Daichi Hirono | 20754c5 | 2015-12-15 18:52:26 +0900 | [diff] [blame] | 129 | final MtpDeviceRecord[] devices = mManager.getDevices(); |
Daichi Hirono | 7a375c4 | 2015-12-14 17:14:29 +0900 | [diff] [blame] | 130 | mDatabase.getMapper().startAddingDocuments(null /* parentDocumentId */); |
Daichi Hirono | 20754c5 | 2015-12-15 18:52:26 +0900 | [diff] [blame] | 131 | for (final MtpDeviceRecord device : devices) { |
| 132 | if (mDatabase.getMapper().putDeviceDocument(device)) { |
| 133 | changed = true; |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 134 | } |
| 135 | } |
Daichi Hirono | 20754c5 | 2015-12-15 18:52:26 +0900 | [diff] [blame] | 136 | if (mDatabase.getMapper().stopAddingDocuments(null /* parentDocumentId */)) { |
| 137 | changed = true; |
| 138 | } |
Daichi Hirono | b3fe72b | 2015-12-15 07:45:06 +0000 | [diff] [blame] | 139 | |
| 140 | // Update roots. |
Daichi Hirono | 20754c5 | 2015-12-15 18:52:26 +0900 | [diff] [blame] | 141 | for (final MtpDeviceRecord device : devices) { |
| 142 | final String documentId = mDatabase.getDocumentIdForDevice(device.deviceId); |
| 143 | if (documentId == null) { |
| 144 | continue; |
| 145 | } |
Daichi Hirono | b3fe72b | 2015-12-15 07:45:06 +0000 | [diff] [blame] | 146 | mDatabase.getMapper().startAddingDocuments(documentId); |
Daichi Hirono | 81d4853 | 2015-12-16 15:03:19 +0900 | [diff] [blame] | 147 | if (mDatabase.getMapper().putStorageDocuments( |
Daichi Hirono | 20754c5 | 2015-12-15 18:52:26 +0900 | [diff] [blame] | 148 | documentId, mResources, device.roots)) { |
Daichi Hirono | b3fe72b | 2015-12-15 07:45:06 +0000 | [diff] [blame] | 149 | changed = true; |
| 150 | } |
| 151 | if (mDatabase.getMapper().stopAddingDocuments(documentId)) { |
| 152 | changed = true; |
| 153 | } |
Daichi Hirono | 7a375c4 | 2015-12-14 17:14:29 +0900 | [diff] [blame] | 154 | } |
Daichi Hirono | b3fe72b | 2015-12-15 07:45:06 +0000 | [diff] [blame] | 155 | |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 156 | if (changed) { |
| 157 | notifyChange(); |
| 158 | } |
Daichi Hirono | fda7474 | 2016-02-01 13:00:31 +0900 | [diff] [blame^] | 159 | mFirstScanCompleted.countDown(); |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 160 | pollingCount++; |
| 161 | try { |
| 162 | // Use SHORT_POLLING_PERIOD for the first SHORT_POLLING_TIMES because it is |
| 163 | // more likely to add new root just after the device is added. |
| 164 | // TODO: Use short interval only for a device that is just added. |
| 165 | Thread.sleep(pollingCount > SHORT_POLLING_TIMES ? |
| 166 | LONG_POLLING_INTERVAL : SHORT_POLLING_INTERVAL); |
| 167 | } catch (InterruptedException exp) { |
Daichi Hirono | 2bdb388 | 2015-12-22 12:57:47 +0900 | [diff] [blame] | 168 | break; |
Daichi Hirono | e1d5771 | 2015-11-17 10:55:45 +0900 | [diff] [blame] | 169 | } |
Daichi Hirono | 8b9024f | 2015-08-12 12:59:09 +0900 | [diff] [blame] | 170 | } |
| 171 | } |
| 172 | } |
| 173 | } |