Support expiration of preloaded file cache
When device is provisioned, we delete all files from /data/preloads
except file_cache. We should do best effort to keep file_cache during
the first config_keepPreloadsMinDays. After that,
persist.sys.preloads.file_cache_expired is set to 1, which indicates
that cache can be deleted when additional storage space is requested.
Bug: 34690396
Test: Manual + RetailDemoModeServiceTest
Change-Id: Ie584a9dd6689bcc5e6b3cb448e95dfe5f73d2eeb
diff --git a/services/core/java/com/android/server/PreloadsFileCacheExpirationJobService.java b/services/core/java/com/android/server/PreloadsFileCacheExpirationJobService.java
new file mode 100644
index 0000000..6fd0256
--- /dev/null
+++ b/services/core/java/com/android/server/PreloadsFileCacheExpirationJobService.java
@@ -0,0 +1,85 @@
+/*
+ * 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;
+
+import android.app.job.JobInfo;
+import android.app.job.JobParameters;
+import android.app.job.JobScheduler;
+import android.app.job.JobService;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.res.Resources;
+import android.os.Environment;
+import android.os.SystemProperties;
+import android.util.Slog;
+import android.util.TimeUtils;
+
+import com.android.internal.R;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * {@link JobService} that marks
+ * {@link Environment#getDataPreloadsFileCacheDirectory() preloaded file cache} as expired after a
+ * pre-configured timeout.
+ */
+public class PreloadsFileCacheExpirationJobService extends JobService {
+ private static final boolean DEBUG = false; // Do not submit with true
+ private static final String TAG = "PreloadsFileCacheExpirationJobService";
+
+ // TODO move all JOB_IDs into a single class to avoid collisions
+ private static final int JOB_ID = 100500;
+
+ private static final String PERSIST_SYS_PRELOADS_FILE_CACHE_EXPIRED
+ = "persist.sys.preloads.file_cache_expired";
+
+ public static void schedule(Context context) {
+ int keepPreloadsMinDays = Resources.getSystem().getInteger(
+ R.integer.config_keepPreloadsMinDays); // Default is 1 week
+ long keepPreloadsMinTimeoutMs = DEBUG ? TimeUnit.MINUTES.toMillis(2)
+ : TimeUnit.DAYS.toMillis(keepPreloadsMinDays);
+ long keepPreloadsMaxTimeoutMs = DEBUG ? TimeUnit.MINUTES.toMillis(3)
+ : TimeUnit.DAYS.toMillis(keepPreloadsMinDays + 1);
+
+ if (DEBUG) {
+ StringBuilder sb = new StringBuilder("Scheduling expiration job to run in ");
+ TimeUtils.formatDuration(keepPreloadsMinTimeoutMs, sb);
+ Slog.i(TAG, sb.toString());
+ }
+ JobInfo expirationJob = new JobInfo.Builder(JOB_ID,
+ new ComponentName(context, PreloadsFileCacheExpirationJobService.class))
+ .setPersisted(true)
+ .setMinimumLatency(keepPreloadsMinTimeoutMs)
+ .setOverrideDeadline(keepPreloadsMaxTimeoutMs)
+ .build();
+
+ JobScheduler jobScheduler = context.getSystemService(JobScheduler.class);
+ jobScheduler.schedule(expirationJob);
+ }
+
+ @Override
+ public boolean onStartJob(JobParameters params) {
+ SystemProperties.set(PERSIST_SYS_PRELOADS_FILE_CACHE_EXPIRED, "1");
+ Slog.i(TAG, "Set " + PERSIST_SYS_PRELOADS_FILE_CACHE_EXPIRED + "=1");
+ return false;
+ }
+
+ @Override
+ public boolean onStopJob(JobParameters params) {
+ return false;
+ }
+}