| /* |
| * Copyright (C) 2007-2008 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 com.android.server.am.ActivityManagerService; |
| import android.app.Notification; |
| import android.app.NotificationManager; |
| import android.app.PendingIntent; |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.IPackageDataObserver; |
| import android.content.pm.IPackageManager; |
| import android.os.Binder; |
| import android.os.Handler; |
| import android.os.Message; |
| import android.os.Process; |
| import android.os.RemoteException; |
| import android.os.ServiceManager; |
| import android.os.StatFs; |
| import android.os.SystemClock; |
| import android.os.SystemProperties; |
| import android.provider.Settings.Gservices; |
| import android.util.Config; |
| import android.util.EventLog; |
| import android.util.Log; |
| import android.provider.Settings; |
| |
| /** |
| * This class implements a service to monitor the amount of disk storage space |
| * on the device. If the free storage on device is less than a tunable threshold value |
| * (default is 10%. this value is a gservices parameter) a low memory notification is |
| * displayed to alert the user. If the user clicks on the low memory notification the |
| * Application Manager application gets launched to let the user free storage space. |
| * Event log events: |
| * A low memory event with the free storage on device in bytes is logged to the event log |
| * when the device goes low on storage space. |
| * The amount of free storage on the device is periodically logged to the event log. The log |
| * interval is a gservices parameter with a default value of 12 hours |
| * When the free storage differential goes below a threshold(again a gservices parameter with |
| * a default value of 2MB), the free memory is logged to the event log |
| */ |
| class DeviceStorageMonitorService extends Binder { |
| private static final String TAG = "DeviceStorageMonitorService"; |
| private static final boolean DEBUG = false; |
| private static final boolean localLOGV = DEBUG ? Config.LOGD : Config.LOGV; |
| private static final int DEVICE_MEMORY_WHAT = 1; |
| private static final int MONITOR_INTERVAL = 1; //in minutes |
| private static final int LOW_MEMORY_NOTIFICATION_ID = 1; |
| private static final int DEFAULT_THRESHOLD_PERCENTAGE = 10; |
| private static final int DEFAULT_FREE_STORAGE_LOG_INTERVAL_IN_MINUTES = 12*60; //in minutes |
| private static final int EVENT_LOG_STORAGE_BELOW_THRESHOLD = 2744; |
| private static final int EVENT_LOG_LOW_STORAGE_NOTIFICATION = 2745; |
| private static final int EVENT_LOG_FREE_STORAGE_LEFT = 2746; |
| private static final long DEFAULT_DISK_FREE_CHANGE_REPORTING_THRESHOLD = 2 * 1024 * 1024; // 2MB |
| private static final long DEFAULT_CHECK_INTERVAL = MONITOR_INTERVAL*60*1000; |
| private long mFreeMem; // on /data |
| private long mLastReportedFreeMem; |
| private long mLastReportedFreeMemTime; |
| private boolean mLowMemFlag=false; |
| private Context mContext; |
| private ContentResolver mContentResolver; |
| private long mTotalMemory; // on /data |
| private StatFs mDataFileStats; |
| private StatFs mSystemFileStats; |
| private StatFs mCacheFileStats; |
| private static final String DATA_PATH = "/data"; |
| private static final String SYSTEM_PATH = "/system"; |
| private static final String CACHE_PATH = "/cache"; |
| private long mThreadStartTime = -1; |
| private boolean mClearSucceeded = false; |
| private boolean mClearingCache; |
| private Intent mStorageLowIntent; |
| private Intent mStorageOkIntent; |
| private CachePackageDataObserver mClearCacheObserver; |
| private static final int _TRUE = 1; |
| private static final int _FALSE = 0; |
| |
| /** |
| * This string is used for ServiceManager access to this class. |
| */ |
| static final String SERVICE = "devicestoragemonitor"; |
| |
| /** |
| * Handler that checks the amount of disk space on the device and sends a |
| * notification if the device runs low on disk space |
| */ |
| Handler mHandler = new Handler() { |
| @Override |
| public void handleMessage(Message msg) { |
| //dont handle an invalid message |
| if (msg.what != DEVICE_MEMORY_WHAT) { |
| Log.e(TAG, "Will not process invalid message"); |
| return; |
| } |
| checkMemory(msg.arg1 == _TRUE); |
| } |
| }; |
| |
| class CachePackageDataObserver extends IPackageDataObserver.Stub { |
| public void onRemoveCompleted(String packageName, boolean succeeded) { |
| mClearSucceeded = succeeded; |
| mClearingCache = false; |
| if(localLOGV) Log.i(TAG, " Clear succeeded:"+mClearSucceeded |
| +", mClearingCache:"+mClearingCache+" Forcing memory check"); |
| postCheckMemoryMsg(false, 0); |
| } |
| } |
| |
| private final void restatDataDir() { |
| try { |
| mDataFileStats.restat(DATA_PATH); |
| mFreeMem = (long) mDataFileStats.getAvailableBlocks() * |
| mDataFileStats.getBlockSize(); |
| } catch (IllegalArgumentException e) { |
| // use the old value of mFreeMem |
| } |
| // Allow freemem to be overridden by debug.freemem for testing |
| String debugFreeMem = SystemProperties.get("debug.freemem"); |
| if (!"".equals(debugFreeMem)) { |
| mFreeMem = Long.parseLong(debugFreeMem); |
| } |
| // Read the log interval from Gservices |
| long freeMemLogInterval = Gservices.getLong(mContentResolver, |
| Gservices.SYS_FREE_STORAGE_LOG_INTERVAL, |
| DEFAULT_FREE_STORAGE_LOG_INTERVAL_IN_MINUTES)*60*1000; |
| //log the amount of free memory in event log |
| long currTime = SystemClock.elapsedRealtime(); |
| if((mLastReportedFreeMemTime == 0) || |
| (currTime-mLastReportedFreeMemTime) >= freeMemLogInterval) { |
| mLastReportedFreeMemTime = currTime; |
| long mFreeSystem = -1, mFreeCache = -1; |
| try { |
| mSystemFileStats.restat(SYSTEM_PATH); |
| mFreeSystem = (long) mSystemFileStats.getAvailableBlocks() * |
| mSystemFileStats.getBlockSize(); |
| } catch (IllegalArgumentException e) { |
| // ignore; report -1 |
| } |
| try { |
| mCacheFileStats.restat(CACHE_PATH); |
| mFreeCache = (long) mCacheFileStats.getAvailableBlocks() * |
| mCacheFileStats.getBlockSize(); |
| } catch (IllegalArgumentException e) { |
| // ignore; report -1 |
| } |
| mCacheFileStats.restat(CACHE_PATH); |
| EventLog.writeEvent(EVENT_LOG_FREE_STORAGE_LEFT, |
| mFreeMem, mFreeSystem, mFreeCache); |
| } |
| // Read the reporting threshold from Gservices |
| long threshold = Gservices.getLong(mContentResolver, |
| Gservices.DISK_FREE_CHANGE_REPORTING_THRESHOLD, |
| DEFAULT_DISK_FREE_CHANGE_REPORTING_THRESHOLD); |
| // If mFree changed significantly log the new value |
| long delta = mFreeMem - mLastReportedFreeMem; |
| if (delta > threshold || delta < -threshold) { |
| mLastReportedFreeMem = mFreeMem; |
| EventLog.writeEvent(EVENT_LOG_STORAGE_BELOW_THRESHOLD, mFreeMem); |
| } |
| } |
| |
| private final void clearCache() { |
| if (mClearCacheObserver == null) { |
| // Lazy instantiation |
| mClearCacheObserver = new CachePackageDataObserver(); |
| } |
| mClearingCache = true; |
| try { |
| if (localLOGV) Log.i(TAG, "Clearing cache"); |
| IPackageManager.Stub.asInterface(ServiceManager.getService("package")). |
| freeStorageAndNotify(getMemThreshold(), mClearCacheObserver); |
| } catch (RemoteException e) { |
| Log.w(TAG, "Failed to get handle for PackageManger Exception: "+e); |
| mClearingCache = false; |
| mClearSucceeded = false; |
| } |
| } |
| |
| private final void checkMemory(boolean checkCache) { |
| //if the thread that was started to clear cache is still running do nothing till its |
| //finished clearing cache. Ideally this flag could be modified by clearCache |
| // and should be accessed via a lock but even if it does this test will fail now and |
| //hopefully the next time this flag will be set to the correct value. |
| if(mClearingCache) { |
| if(localLOGV) Log.i(TAG, "Thread already running just skip"); |
| //make sure the thread is not hung for too long |
| long diffTime = System.currentTimeMillis() - mThreadStartTime; |
| if(diffTime > (10*60*1000)) { |
| Log.w(TAG, "Thread that clears cache file seems to run for ever"); |
| } |
| } else { |
| restatDataDir(); |
| if (localLOGV) Log.v(TAG, "freeMemory="+mFreeMem); |
| |
| //post intent to NotificationManager to display icon if necessary |
| long memThreshold = getMemThreshold(); |
| if (mFreeMem < memThreshold) { |
| if (!mLowMemFlag) { |
| if (checkCache) { |
| // See if clearing cache helps |
| // Note that clearing cache is asynchronous and so we do a |
| // memory check again once the cache has been cleared. |
| mThreadStartTime = System.currentTimeMillis(); |
| mClearSucceeded = false; |
| clearCache(); |
| } else { |
| Log.i(TAG, "Running low on memory. Sending notification"); |
| sendNotification(); |
| mLowMemFlag = true; |
| } |
| } else { |
| if (localLOGV) Log.v(TAG, "Running low on memory " + |
| "notification already sent. do nothing"); |
| } |
| } else { |
| if (mLowMemFlag) { |
| Log.i(TAG, "Memory available. Cancelling notification"); |
| cancelNotification(); |
| mLowMemFlag = false; |
| } |
| } |
| } |
| if(localLOGV) Log.i(TAG, "Posting Message again"); |
| //keep posting messages to itself periodically |
| postCheckMemoryMsg(true, DEFAULT_CHECK_INTERVAL); |
| } |
| |
| private void postCheckMemoryMsg(boolean clearCache, long delay) { |
| // Remove queued messages |
| mHandler.removeMessages(DEVICE_MEMORY_WHAT); |
| mHandler.sendMessageDelayed(mHandler.obtainMessage(DEVICE_MEMORY_WHAT, |
| clearCache ?_TRUE : _FALSE, 0), |
| delay); |
| } |
| |
| /* |
| * just query settings to retrieve the memory threshold. |
| * Preferred this over using a ContentObserver since Settings.Gservices caches the value |
| * any way |
| */ |
| private long getMemThreshold() { |
| int value = Settings.Gservices.getInt( |
| mContentResolver, |
| Settings.Gservices.SYS_STORAGE_THRESHOLD_PERCENTAGE, |
| DEFAULT_THRESHOLD_PERCENTAGE); |
| if(localLOGV) Log.v(TAG, "Threshold Percentage="+value); |
| //evaluate threshold value |
| return mTotalMemory*value; |
| } |
| |
| /** |
| * Constructor to run service. initializes the disk space threshold value |
| * and posts an empty message to kickstart the process. |
| */ |
| public DeviceStorageMonitorService(Context context) { |
| mLastReportedFreeMemTime = 0; |
| mContext = context; |
| mContentResolver = mContext.getContentResolver(); |
| //create StatFs object |
| mDataFileStats = new StatFs(DATA_PATH); |
| mSystemFileStats = new StatFs(SYSTEM_PATH); |
| mCacheFileStats = new StatFs(CACHE_PATH); |
| //initialize total storage on device |
| mTotalMemory = ((long)mDataFileStats.getBlockCount() * |
| mDataFileStats.getBlockSize())/100L; |
| mStorageLowIntent = new Intent(Intent.ACTION_DEVICE_STORAGE_LOW); |
| mStorageOkIntent = new Intent(Intent.ACTION_DEVICE_STORAGE_OK); |
| checkMemory(true); |
| } |
| |
| |
| /** |
| * This method sends a notification to NotificationManager to display |
| * an error dialog indicating low disk space and launch the Installer |
| * application |
| */ |
| private final void sendNotification() { |
| if(localLOGV) Log.i(TAG, "Sending low memory notification"); |
| //log the event to event log with the amount of free storage(in bytes) left on the device |
| EventLog.writeEvent(EVENT_LOG_LOW_STORAGE_NOTIFICATION, mFreeMem); |
| // Pack up the values and broadcast them to everyone |
| Intent lowMemIntent = new Intent(Intent.ACTION_MANAGE_PACKAGE_STORAGE); |
| lowMemIntent.putExtra("memory", mFreeMem); |
| lowMemIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); |
| NotificationManager mNotificationMgr = |
| (NotificationManager)mContext.getSystemService( |
| Context.NOTIFICATION_SERVICE); |
| CharSequence title = mContext.getText( |
| com.android.internal.R.string.low_internal_storage_view_title); |
| CharSequence details = mContext.getText( |
| com.android.internal.R.string.low_internal_storage_view_text); |
| PendingIntent intent = PendingIntent.getActivity(mContext, 0, lowMemIntent, 0); |
| Notification notification = new Notification(); |
| notification.icon = com.android.internal.R.drawable.stat_notify_disk_full; |
| notification.tickerText = title; |
| notification.flags |= Notification.FLAG_NO_CLEAR; |
| notification.setLatestEventInfo(mContext, title, details, intent); |
| mNotificationMgr.notify(LOW_MEMORY_NOTIFICATION_ID, notification); |
| mContext.sendStickyBroadcast(mStorageLowIntent); |
| } |
| |
| /** |
| * Cancels low storage notification and sends OK intent. |
| */ |
| private final void cancelNotification() { |
| if(localLOGV) Log.i(TAG, "Canceling low memory notification"); |
| NotificationManager mNotificationMgr = |
| (NotificationManager)mContext.getSystemService( |
| Context.NOTIFICATION_SERVICE); |
| //cancel notification since memory has been freed |
| mNotificationMgr.cancel(LOW_MEMORY_NOTIFICATION_ID); |
| |
| mContext.removeStickyBroadcast(mStorageLowIntent); |
| mContext.sendBroadcast(mStorageOkIntent); |
| } |
| |
| public void updateMemory() { |
| int callingUid = getCallingUid(); |
| if(callingUid != Process.SYSTEM_UID) { |
| return; |
| } |
| // force an early check |
| postCheckMemoryMsg(true, 0); |
| } |
| } |