1 files changed, 103 insertions, 0 deletions
diff --git a/packages/CrashRecovery/services/java/com/android/utils/BackgroundThread.java b/packages/CrashRecovery/services/java/com/android/utils/BackgroundThread.java
new file mode 100644
index 000000000000..afcf6895fd0d
--- /dev/null
+++ b/packages/CrashRecovery/services/java/com/android/utils/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.utils;
+
+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;
+        }
+    }
+}