77 lines
2.5 KiB
Java
77 lines
2.5 KiB
Java
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.internal.os;
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import android.os.Handler;
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import android.os.HandlerExecutor;
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import android.os.HandlerThread;
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import android.os.Looper;
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import android.os.Trace;
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import java.util.concurrent.Executor;
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/**
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* Shared singleton background thread for each process.
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*/
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@android.ravenwood.annotation.RavenwoodKeepWholeClass
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public final class BackgroundThread extends HandlerThread {
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private static final long SLOW_DISPATCH_THRESHOLD_MS = 10_000;
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private static final long SLOW_DELIVERY_THRESHOLD_MS = 30_000;
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private static BackgroundThread sInstance;
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private static Handler sHandler;
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private static HandlerExecutor sHandlerExecutor;
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private BackgroundThread() {
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super("android.bg", android.os.Process.THREAD_PRIORITY_BACKGROUND);
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}
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private static void ensureThreadLocked() {
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if (sInstance == null) {
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sInstance = new BackgroundThread();
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sInstance.start();
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final Looper looper = sInstance.getLooper();
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looper.setTraceTag(Trace.TRACE_TAG_SYSTEM_SERVER);
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looper.setSlowLogThresholdMs(
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SLOW_DISPATCH_THRESHOLD_MS, SLOW_DELIVERY_THRESHOLD_MS);
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sHandler = new Handler(sInstance.getLooper(), /*callback=*/ null, /* async=*/ false,
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/* shared=*/ true);
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sHandlerExecutor = new HandlerExecutor(sHandler);
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}
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}
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public static BackgroundThread get() {
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synchronized (BackgroundThread.class) {
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ensureThreadLocked();
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return sInstance;
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}
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}
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public static Handler getHandler() {
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synchronized (BackgroundThread.class) {
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ensureThreadLocked();
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return sHandler;
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}
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}
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public static Executor getExecutor() {
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synchronized (BackgroundThread.class) {
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ensureThreadLocked();
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return sHandlerExecutor;
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}
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}
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}
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