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/*
* Copyright (C) 2012 The CyanogenMod 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.settings.cyanogenmod;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceScreen;
import com.android.settings.R;
import com.android.settings.SettingsPreferenceFragment;
import com.android.settings.Utils;
//
// I/O Scheduler Related Settings
//
public class IOScheduler extends SettingsPreferenceFragment implements
Preference.OnPreferenceChangeListener {
public static final String IOSCHED_PREF = "pref_io_sched";
public static final String IOSCHED_LIST_FILE = "/sys/block/mmcblk0/queue/scheduler";
public static final String SOB_PREF = "pref_io_sched_set_on_boot";
private static final String TAG = "IOScheduler";
private String mIOSchedulerFormat;
private ListPreference mIOSchedulerPref;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mIOSchedulerFormat = getString(R.string.io_sched_summary);
String[] availableIOSchedulers = new String[0];
String availableIOSchedulersLine;
int bropen, brclose;
String currentIOScheduler = null;
addPreferencesFromResource(R.xml.ioscheduler_settings);
PreferenceScreen prefScreen = getPreferenceScreen();
mIOSchedulerPref = (ListPreference) prefScreen.findPreference(IOSCHED_PREF);
/* I/O scheduler
Some systems might not use I/O schedulers */
if (!Utils.fileExists(IOSCHED_LIST_FILE) ||
(availableIOSchedulersLine = Utils.fileReadOneLine(IOSCHED_LIST_FILE)) == null) {
prefScreen.removePreference(mIOSchedulerPref);
} else {
availableIOSchedulers = availableIOSchedulersLine.replace("[", "").replace("]", "").split(" ");
bropen = availableIOSchedulersLine.indexOf("[");
brclose = availableIOSchedulersLine.lastIndexOf("]");
if (bropen >= 0 && brclose >= 0)
currentIOScheduler = availableIOSchedulersLine.substring(bropen + 1, brclose);
mIOSchedulerPref.setEntryValues(availableIOSchedulers);
mIOSchedulerPref.setEntries(availableIOSchedulers);
if (currentIOScheduler != null)
mIOSchedulerPref.setValue(currentIOScheduler);
mIOSchedulerPref.setSummary(String.format(mIOSchedulerFormat, currentIOScheduler));
mIOSchedulerPref.setOnPreferenceChangeListener(this);
}
}
@Override
public void onResume() {
String availableIOSchedulersLine;
int bropen, brclose;
String currentIOScheduler;
super.onResume();
if (Utils.fileExists(IOSCHED_LIST_FILE) &&
(availableIOSchedulersLine = Utils.fileReadOneLine(IOSCHED_LIST_FILE)) != null) {
bropen = availableIOSchedulersLine.indexOf("[");
brclose = availableIOSchedulersLine.lastIndexOf("]");
if (bropen >= 0 && brclose >= 0) {
currentIOScheduler = availableIOSchedulersLine.substring(bropen + 1, brclose);
mIOSchedulerPref.setSummary(String.format(mIOSchedulerFormat, currentIOScheduler));
}
}
}
public boolean onPreferenceChange(Preference preference, Object newValue) {
String fname = "";
if (newValue != null) {
if (preference == mIOSchedulerPref) {
fname = IOSCHED_LIST_FILE;
}
if (Utils.fileWriteOneLine(fname, (String) newValue)) {
if (preference == mIOSchedulerPref) {
mIOSchedulerPref.setSummary(String.format(mIOSchedulerFormat, (String) newValue));
}
return true;
} else {
return false;
}
}
return false;
}
}
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