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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server;
import android.content.ContentResolver;
import android.os.DropBoxManager;
import android.os.FileObserver;
import android.os.Binder;
import android.util.Slog;
import android.content.Context;
import android.database.ContentObserver;
import android.os.SystemProperties;
import android.provider.Settings;
import com.android.internal.os.SamplingProfilerIntegration;
import java.io.File;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.PrintWriter;
public class SamplingProfilerService extends Binder {
private static final String TAG = "SamplingProfilerService";
private static final boolean LOCAL_LOGV = false;
public static final String SNAPSHOT_DIR = SamplingProfilerIntegration.SNAPSHOT_DIR;
private FileObserver snapshotObserver;
public SamplingProfilerService(Context context) {
registerSettingObserver(context);
startWorking(context);
}
private void startWorking(Context context) {
if (LOCAL_LOGV) Slog.v(TAG, "starting SamplingProfilerService!");
final DropBoxManager dropbox =
(DropBoxManager) context.getSystemService(Context.DROPBOX_SERVICE);
// before FileObserver is ready, there could have already been some snapshots
// in the directory, we don't want to miss them
File[] snapshotFiles = new File(SNAPSHOT_DIR).listFiles();
for (int i = 0; snapshotFiles != null && i < snapshotFiles.length; i++) {
handleSnapshotFile(snapshotFiles[i], dropbox);
}
// detect new snapshot and put it in dropbox
// delete it afterwards no matter what happened before
// Note: needs listening at event ATTRIB rather than CLOSE_WRITE, because we set the
// readability of snapshot files after writing them!
snapshotObserver = new FileObserver(SNAPSHOT_DIR, FileObserver.ATTRIB) {
@Override
public void onEvent(int event, String path) {
handleSnapshotFile(new File(SNAPSHOT_DIR, path), dropbox);
}
};
snapshotObserver.startWatching();
if (LOCAL_LOGV) Slog.v(TAG, "SamplingProfilerService activated");
}
private void handleSnapshotFile(File file, DropBoxManager dropbox) {
try {
dropbox.addFile(TAG, file, 0);
if (LOCAL_LOGV) Slog.v(TAG, file.getPath() + " added to dropbox");
} catch (IOException e) {
Slog.e(TAG, "Can't add " + file.getPath() + " to dropbox", e);
} finally {
file.delete();
}
}
private void registerSettingObserver(Context context) {
ContentResolver contentResolver = context.getContentResolver();
contentResolver.registerContentObserver(
Settings.Secure.getUriFor(Settings.Secure.SAMPLING_PROFILER_MS),
false, new SamplingProfilerSettingsObserver(contentResolver));
}
@Override
protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
pw.println("SamplingProfilerService:");
pw.println("Watching directory: " + SNAPSHOT_DIR);
}
private class SamplingProfilerSettingsObserver extends ContentObserver {
private ContentResolver mContentResolver;
public SamplingProfilerSettingsObserver(ContentResolver contentResolver) {
super(null);
mContentResolver = contentResolver;
onChange(false);
}
@Override
public void onChange(boolean selfChange) {
Integer samplingProfilerMs = Settings.Secure.getInt(
mContentResolver, Settings.Secure.SAMPLING_PROFILER_MS, 0);
// setting this secure property will start or stop sampling profiler,
// as well as adjust the the time between taking snapshots.
SystemProperties.set("persist.sys.profiler_ms", samplingProfilerMs.toString());
}
}
}
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