1 /* 2 * Copyright (C) 2010 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; 18 19 import android.content.ContentResolver; 20 import android.os.DropBoxManager; 21 import android.os.FileObserver; 22 import android.os.Binder; 23 24 import android.util.Slog; 25 import android.content.Context; 26 import android.database.ContentObserver; 27 import android.os.SystemProperties; 28 import android.provider.Settings; 29 import com.android.internal.os.SamplingProfilerIntegration; 30 31 import java.io.File; 32 import java.io.FileDescriptor; 33 import java.io.IOException; 34 import java.io.PrintWriter; 35 36 public class SamplingProfilerService extends Binder { 37 38 private static final String TAG = "SamplingProfilerService"; 39 private static final boolean LOCAL_LOGV = false; 40 public static final String SNAPSHOT_DIR = SamplingProfilerIntegration.SNAPSHOT_DIR; 41 42 private FileObserver snapshotObserver; 43 SamplingProfilerService(Context context)44 public SamplingProfilerService(Context context) { 45 registerSettingObserver(context); 46 startWorking(context); 47 } 48 startWorking(Context context)49 private void startWorking(Context context) { 50 if (LOCAL_LOGV) Slog.v(TAG, "starting SamplingProfilerService!"); 51 52 final DropBoxManager dropbox = 53 (DropBoxManager) context.getSystemService(Context.DROPBOX_SERVICE); 54 55 // before FileObserver is ready, there could have already been some snapshots 56 // in the directory, we don't want to miss them 57 File[] snapshotFiles = new File(SNAPSHOT_DIR).listFiles(); 58 for (int i = 0; snapshotFiles != null && i < snapshotFiles.length; i++) { 59 handleSnapshotFile(snapshotFiles[i], dropbox); 60 } 61 62 // detect new snapshot and put it in dropbox 63 // delete it afterwards no matter what happened before 64 // Note: needs listening at event ATTRIB rather than CLOSE_WRITE, because we set the 65 // readability of snapshot files after writing them! 66 snapshotObserver = new FileObserver(SNAPSHOT_DIR, FileObserver.ATTRIB) { 67 @Override 68 public void onEvent(int event, String path) { 69 handleSnapshotFile(new File(SNAPSHOT_DIR, path), dropbox); 70 } 71 }; 72 snapshotObserver.startWatching(); 73 74 if (LOCAL_LOGV) Slog.v(TAG, "SamplingProfilerService activated"); 75 } 76 handleSnapshotFile(File file, DropBoxManager dropbox)77 private void handleSnapshotFile(File file, DropBoxManager dropbox) { 78 try { 79 dropbox.addFile(TAG, file, 0); 80 if (LOCAL_LOGV) Slog.v(TAG, file.getPath() + " added to dropbox"); 81 } catch (IOException e) { 82 Slog.e(TAG, "Can't add " + file.getPath() + " to dropbox", e); 83 } finally { 84 file.delete(); 85 } 86 } 87 registerSettingObserver(Context context)88 private void registerSettingObserver(Context context) { 89 ContentResolver contentResolver = context.getContentResolver(); 90 contentResolver.registerContentObserver( 91 Settings.Secure.getUriFor(Settings.Secure.SAMPLING_PROFILER_MS), 92 false, new SamplingProfilerSettingsObserver(contentResolver)); 93 } 94 95 @Override dump(FileDescriptor fd, PrintWriter pw, String[] args)96 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 97 pw.println("SamplingProfilerService:"); 98 pw.println("Watching directory: " + SNAPSHOT_DIR); 99 } 100 101 private class SamplingProfilerSettingsObserver extends ContentObserver { 102 private ContentResolver mContentResolver; SamplingProfilerSettingsObserver(ContentResolver contentResolver)103 public SamplingProfilerSettingsObserver(ContentResolver contentResolver) { 104 super(null); 105 mContentResolver = contentResolver; 106 onChange(false); 107 } 108 @Override onChange(boolean selfChange)109 public void onChange(boolean selfChange) { 110 Integer samplingProfilerMs = Settings.Secure.getInt( 111 mContentResolver, Settings.Secure.SAMPLING_PROFILER_MS, 0); 112 // setting this secure property will start or stop sampling profiler, 113 // as well as adjust the the time between taking snapshots. 114 SystemProperties.set("persist.sys.profiler_ms", samplingProfilerMs.toString()); 115 } 116 } 117 } 118