Merge "Add background executor fow WmShell" into tm-dev am: a73a4428ff

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17693175

Change-Id: I1fb60ad0fb91405af6f2d57a44ef9885ebd658a9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

libs/WindowManager/Shell/src/com/android/wm/shell/common/annotations/ShellBackgroundThread.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2021 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.wm.shell.common.annotations;
+
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.Inherited;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+import javax.inject.Qualifier;
+
+/** Annotates a method or qualifies a provider that runs on the shared background thread */
+@Documented
+@Inherited
+@Qualifier
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ShellBackgroundThread {
+}

libs/WindowManager/Shell/src/com/android/wm/shell/dagger/WMShellConcurrencyModule.java

@@ -16,6 +16,7 @@
 
 package com.android.wm.shell.dagger;
 
+import static android.os.Process.THREAD_PRIORITY_BACKGROUND;
 import static android.os.Process.THREAD_PRIORITY_DISPLAY;
 import static android.os.Process.THREAD_PRIORITY_TOP_APP_BOOST;
 
@@ -36,6 +37,7 @@ import com.android.wm.shell.common.ShellExecutor;
 import com.android.wm.shell.common.annotations.ChoreographerSfVsync;
 import com.android.wm.shell.common.annotations.ExternalMainThread;
 import com.android.wm.shell.common.annotations.ShellAnimationThread;
+import com.android.wm.shell.common.annotations.ShellBackgroundThread;
 import com.android.wm.shell.common.annotations.ShellMainThread;
 import com.android.wm.shell.common.annotations.ShellSplashscreenThread;
 
@@ -195,4 +197,28 @@ public abstract class WMShellConcurrencyModule {
             throw new RuntimeException("Failed to initialize SfVsync animation handler in 1s", e);
         }
     }
+
+    /**
+     * Provides a Shell background thread Handler for low priority background tasks.
+     */
+    @WMSingleton
+    @Provides
+    @ShellBackgroundThread
+    public static Handler provideSharedBackgroundHandler() {
+        HandlerThread shellBackgroundThread = new HandlerThread("wmshell.background",
+                THREAD_PRIORITY_BACKGROUND);
+        shellBackgroundThread.start();
+        return shellBackgroundThread.getThreadHandler();
+    }
+
+    /**
+     * Provides a Shell background thread Executor for low priority background tasks.
+     */
+    @WMSingleton
+    @Provides
+    @ShellBackgroundThread
+    public static ShellExecutor provideSharedBackgroundExecutor(
+            @ShellBackgroundThread Handler handler) {
+        return new HandlerExecutor(handler);
+    }
 }