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/*
* Copyright (C) 2020 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;
import android.os.Handler;
import android.os.HandlerExecutor;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Trace;
import java.util.concurrent.Executor;
/**
* Shared singleton background thread.
*
* @see com.android.internal.os.BackgroundThread
*/
public final class JobSchedulerBackgroundThread extends HandlerThread {
private static final long SLOW_DISPATCH_THRESHOLD_MS = 10_000;
private static final long SLOW_DELIVERY_THRESHOLD_MS = 30_000;
private static JobSchedulerBackgroundThread sInstance;
private static Handler sHandler;
private static Executor sHandlerExecutor;
private JobSchedulerBackgroundThread() {
super("jobscheduler.bg", android.os.Process.THREAD_PRIORITY_BACKGROUND);
}
private static void ensureThreadLocked() {
if (sInstance == null) {
sInstance = new JobSchedulerBackgroundThread();
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 JobSchedulerBackgroundThread singleton */
public static JobSchedulerBackgroundThread get() {
synchronized (JobSchedulerBackgroundThread.class) {
ensureThreadLocked();
return sInstance;
}
}
/** Returns the singleton handler for JobSchedulerBackgroundThread */
public static Handler getHandler() {
synchronized (JobSchedulerBackgroundThread.class) {
ensureThreadLocked();
return sHandler;
}
}
/** Returns the singleton handler executor for JobSchedulerBackgroundThread */
public static Executor getExecutor() {
synchronized (JobSchedulerBackgroundThread.class) {
ensureThreadLocked();
return sHandlerExecutor;
}
}
}
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