Revert "Modify usagestats event processing thread"

This reverts commit 66c56a0c.

Reason for revert: boot time regression

Bug: 303555768
Change-Id: Id5b1c8be0575324f929b9d6f3b77606c1167caf1

services/usage/java/com/android/server/usage/UsageStatsHandlerThread.java

-/*
- * Copyright (C) 2023 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.usage;
-
-import android.os.Handler;
-import android.os.HandlerExecutor;
-import android.os.HandlerThread;
-import android.os.Looper;
-import android.os.Process;
-import android.os.Trace;
-
-import java.util.concurrent.Executor;
-
-/**
- * Shared singleton default priority thread for usage stats message handling.
- *
- * @see com.android.internal.os.BackgroundThread
- */
-public final class UsageStatsHandlerThread extends HandlerThread {
-    private static final long SLOW_DISPATCH_THRESHOLD_MS = 10_000;
-    private static final long SLOW_DELIVERY_THRESHOLD_MS = 30_000;
-    private static UsageStatsHandlerThread sInstance;
-    private static Handler sHandler;
-    private static Executor sHandlerExecutor;
-
-    private UsageStatsHandlerThread() {
-        super("usagestats.default", Process.THREAD_PRIORITY_DEFAULT);
-    }
-
-    private static void ensureThreadLocked() {
-        if (sInstance == null) {
-            sInstance = new UsageStatsHandlerThread();
-            sInstance.start();
-            final Looper looper = sInstance.getLooper();
-            looper.setTraceTag(Trace.TRACE_TAG_SYSTEM_SERVER);
-            looper.setSlowLogThresholdMs(
-                    SLOW_DISPATCH_THRESHOLD_MS, SLOW_DELIVERY_THRESHOLD_MS);
-            sHandler = new Handler(sInstance.getLooper());
-            sHandlerExecutor = new HandlerExecutor(sHandler);
-        }
-    }
-
-    /** Returns the UsageStatsHandlerThread singleton */
-    public static UsageStatsHandlerThread get() {
-        synchronized (UsageStatsHandlerThread.class) {
-            ensureThreadLocked();
-            return sInstance;
-        }
-    }
-
-    /** Returns the singleton handler for UsageStatsHandlerThread */
-    public static Handler getHandler() {
-        synchronized (UsageStatsHandlerThread.class) {
-            ensureThreadLocked();
-            return sHandler;
-        }
-    }
-
-    /** Returns the singleton handler executor for UsageStatsHandlerThread */
-    public static Executor getExecutor() {
-        synchronized (UsageStatsHandlerThread.class) {
-            ensureThreadLocked();
-            return sHandlerExecutor;
-        }
-    }
-}