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/*
* Copyright (C) 2017 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.job.controllers;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.SystemClock;
import android.os.UserHandle;
import android.util.ArraySet;
import android.util.Slog;
import com.android.internal.annotations.VisibleForTesting;
import com.android.server.job.JobSchedulerService;
import com.android.server.job.StateChangedListener;
import com.android.server.storage.DeviceStorageMonitorService;
import java.io.PrintWriter;
/**
* Simple controller that tracks the status of the device's storage.
*/
public final class StorageController extends StateController {
private static final String TAG = "JobScheduler.Stor";
private static final Object sCreationLock = new Object();
private static volatile StorageController sController;
private final ArraySet<JobStatus> mTrackedTasks = new ArraySet<JobStatus>();
private StorageTracker mStorageTracker;
public static StorageController get(JobSchedulerService taskManagerService) {
synchronized (sCreationLock) {
if (sController == null) {
sController = new StorageController(taskManagerService,
taskManagerService.getContext(), taskManagerService.getLock());
}
}
return sController;
}
@VisibleForTesting
public StorageTracker getTracker() {
return mStorageTracker;
}
@VisibleForTesting
public static StorageController getForTesting(StateChangedListener stateChangedListener,
Context context) {
return new StorageController(stateChangedListener, context, new Object());
}
private StorageController(StateChangedListener stateChangedListener, Context context,
Object lock) {
super(stateChangedListener, context, lock);
mStorageTracker = new StorageTracker();
mStorageTracker.startTracking();
}
@Override
public void maybeStartTrackingJobLocked(JobStatus taskStatus, JobStatus lastJob) {
if (taskStatus.hasStorageNotLowConstraint()) {
mTrackedTasks.add(taskStatus);
taskStatus.setTrackingController(JobStatus.TRACKING_STORAGE);
taskStatus.setStorageNotLowConstraintSatisfied(mStorageTracker.isStorageNotLow());
}
}
@Override
public void maybeStopTrackingJobLocked(JobStatus taskStatus, JobStatus incomingJob,
boolean forUpdate) {
if (taskStatus.clearTrackingController(JobStatus.TRACKING_STORAGE)) {
mTrackedTasks.remove(taskStatus);
}
}
private void maybeReportNewStorageState() {
final boolean storageNotLow = mStorageTracker.isStorageNotLow();
boolean reportChange = false;
synchronized (mLock) {
for (int i = mTrackedTasks.size() - 1; i >= 0; i--) {
final JobStatus ts = mTrackedTasks.valueAt(i);
boolean previous = ts.setStorageNotLowConstraintSatisfied(storageNotLow);
if (previous != storageNotLow) {
reportChange = true;
}
}
}
// Let the scheduler know that state has changed. This may or may not result in an
// execution.
if (reportChange) {
mStateChangedListener.onControllerStateChanged();
}
// Also tell the scheduler that any ready jobs should be flushed.
if (storageNotLow) {
mStateChangedListener.onRunJobNow(null);
}
}
public final class StorageTracker extends BroadcastReceiver {
/**
* Track whether storage is low.
*/
private boolean mStorageLow;
/** Sequence number of last broadcast. */
private int mLastBatterySeq = -1;
public StorageTracker() {
}
public void startTracking() {
IntentFilter filter = new IntentFilter();
// Storage status. Just need to register, since STORAGE_LOW is a sticky
// broadcast we will receive that if it is currently active.
filter.addAction(Intent.ACTION_DEVICE_STORAGE_LOW);
filter.addAction(Intent.ACTION_DEVICE_STORAGE_OK);
mContext.registerReceiver(this, filter);
}
public boolean isStorageNotLow() {
return !mStorageLow;
}
public int getSeq() {
return mLastBatterySeq;
}
@Override
public void onReceive(Context context, Intent intent) {
onReceiveInternal(intent);
}
@VisibleForTesting
public void onReceiveInternal(Intent intent) {
final String action = intent.getAction();
mLastBatterySeq = intent.getIntExtra(DeviceStorageMonitorService.EXTRA_SEQUENCE,
mLastBatterySeq);
if (Intent.ACTION_DEVICE_STORAGE_LOW.equals(action)) {
if (DEBUG) {
Slog.d(TAG, "Available storage too low to do work. @ "
+ SystemClock.elapsedRealtime());
}
mStorageLow = true;
} else if (Intent.ACTION_DEVICE_STORAGE_OK.equals(action)) {
if (DEBUG) {
Slog.d(TAG, "Available stoage high enough to do work. @ "
+ SystemClock.elapsedRealtime());
}
mStorageLow = false;
maybeReportNewStorageState();
}
}
}
@Override
public void dumpControllerStateLocked(PrintWriter pw, int filterUid) {
pw.print("Storage: not low = ");
pw.print(mStorageTracker.isStorageNotLow());
pw.print(", seq=");
pw.println(mStorageTracker.getSeq());
pw.print("Tracking ");
pw.print(mTrackedTasks.size());
pw.println(":");
for (int i = 0; i < mTrackedTasks.size(); i++) {
final JobStatus js = mTrackedTasks.valueAt(i);
if (!js.shouldDump(filterUid)) {
continue;
}
pw.print(" #");
js.printUniqueId(pw);
pw.print(" from ");
UserHandle.formatUid(pw, js.getSourceUid());
pw.println();
}
}
}
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