From d47fc309e4e3c35acfd3959fd075cc060e9f803b Mon Sep 17 00:00:00 2001
From: Harshit Mahajan <harshitmahajan@google.com>
Date: Fri, 5 Apr 2024 20:42:17 +0000
Subject: [PATCH] Revert^2 "Update the BackgroundThread dependency"
1df0ae1849c990a0164ba56ead439a21fdc2a040
Change-Id: I64489e569ab77585ab02b01872f64673e574b3ff
Bug: 333092549
---
.../com/android/server/PackageWatchdog.java | 2 +-
.../com/android/util/BackgroundThread.java | 103 ++++++++++++++++++
.../com/android/util/HandlerExecutor.java | 46 ++++++++
3 files changed, 150 insertions(+), 1 deletion(-)
create mode 100644 packages/CrashRecovery/services/java/com/android/util/BackgroundThread.java
create mode 100644 packages/CrashRecovery/services/java/com/android/util/HandlerExecutor.java
diff --git a/packages/CrashRecovery/services/java/com/android/server/PackageWatchdog.java b/packages/CrashRecovery/services/java/com/android/server/PackageWatchdog.java
index ce8fb6568bd5..5d71b7d98fdc 100644
--- a/packages/CrashRecovery/services/java/com/android/server/PackageWatchdog.java
+++ b/packages/CrashRecovery/services/java/com/android/server/PackageWatchdog.java
@@ -38,13 +38,13 @@ import android.text.TextUtils;
import android.util.ArrayMap;
import android.util.ArraySet;
import android.util.AtomicFile;
+import android.util.BackgroundThread;
import android.util.LongArrayQueue;
import android.util.Slog;
import android.util.Xml;
import com.android.internal.annotations.GuardedBy;
import com.android.internal.annotations.VisibleForTesting;
-import com.android.internal.os.BackgroundThread;
import com.android.internal.util.IndentingPrintWriter;
import com.android.internal.util.XmlUtils;
import com.android.modules.utils.TypedXmlPullParser;
diff --git a/packages/CrashRecovery/services/java/com/android/util/BackgroundThread.java b/packages/CrashRecovery/services/java/com/android/util/BackgroundThread.java
new file mode 100644
index 000000000000..a6ae68f62f10
--- /dev/null
+++ b/packages/CrashRecovery/services/java/com/android/util/BackgroundThread.java
@@ -0,0 +1,103 @@
+/*
+ * * Copyright (C) 2024 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 android.util;
+
+import android.annotation.NonNull;
+import android.os.Handler;
+import android.os.HandlerThread;
+
+import com.android.internal.annotations.GuardedBy;
+
+import java.util.concurrent.Executor;
+
+/**
+ * Thread for asynchronous event processing. This thread is configured as
+ * {@link android.os.Process#THREAD_PRIORITY_BACKGROUND}, which means fewer CPU
+ * resources will be dedicated to it, and it will "have less chance of impacting
+ * the responsiveness of the user interface."
+ * <p>
+ * This thread is best suited for tasks that the user is not actively waiting
+ * for, or for tasks that the user expects to be executed eventually.
+ *
+ * @see com.android.internal.os.BackgroundThread
+ *
+ * TODO: b/326916057 depend on modules-utils-backgroundthread instead
+ * @hide
+ */
+public final class BackgroundThread extends HandlerThread {
+ private static final Object sLock = new Object();
+
+ @GuardedBy("sLock")
+ private static BackgroundThread sInstance;
+ @GuardedBy("sLock")
+ private static Handler sHandler;
+ @GuardedBy("sLock")
+ private static HandlerExecutor sHandlerExecutor;
+
+ private BackgroundThread() {
+ super(BackgroundThread.class.getName(), android.os.Process.THREAD_PRIORITY_BACKGROUND);
+ }
+
+ @GuardedBy("sLock")
+ private static void ensureThreadLocked() {
+ if (sInstance == null) {
+ sInstance = new BackgroundThread();
+ sInstance.start();
+ sHandler = new Handler(sInstance.getLooper());
+ sHandlerExecutor = new HandlerExecutor(sHandler);
+ }
+ }
+
+ /**
+ * Get the singleton instance of this class.
+ *
+ * @return the singleton instance of this class
+ */
+ @NonNull
+ public static BackgroundThread get() {
+ synchronized (sLock) {
+ ensureThreadLocked();
+ return sInstance;
+ }
+ }
+
+ /**
+ * Get the singleton {@link Handler} for this class.
+ *
+ * @return the singleton {@link Handler} for this class.
+ */
+ @NonNull
+ public static Handler getHandler() {
+ synchronized (sLock) {
+ ensureThreadLocked();
+ return sHandler;
+ }
+ }
+
+ /**
+ * Get the singleton {@link Executor} for this class.
+ *
+ * @return the singleton {@link Executor} for this class.
+ */
+ @NonNull
+ public static Executor getExecutor() {
+ synchronized (sLock) {
+ ensureThreadLocked();
+ return sHandlerExecutor;
+ }
+ }
+}
diff --git a/packages/CrashRecovery/services/java/com/android/util/HandlerExecutor.java b/packages/CrashRecovery/services/java/com/android/util/HandlerExecutor.java
new file mode 100644
index 000000000000..948ebcca0263
--- /dev/null
+++ b/packages/CrashRecovery/services/java/com/android/util/HandlerExecutor.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2024 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 android.util;
+
+import android.annotation.NonNull;
+import android.os.Handler;
+
+import java.util.Objects;
+import java.util.concurrent.Executor;
+import java.util.concurrent.RejectedExecutionException;
+
+/**
+ * An adapter {@link Executor} that posts all executed tasks onto the given
+ * {@link Handler}.
+ *
+ * TODO: b/326916057 depend on modules-utils-backgroundthread instead
+ * @hide
+ */
+public class HandlerExecutor implements Executor {
+ private final Handler mHandler;
+
+ public HandlerExecutor(@NonNull Handler handler) {
+ mHandler = Objects.requireNonNull(handler);
+ }
+
+ @Override
+ public void execute(Runnable command) {
+ if (!mHandler.post(command)) {
+ throw new RejectedExecutionException(mHandler + " is shutting down");
+ }
+ }
+}
--
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