eddff07eb8
Follow up on acb48752c.
Just have the subclass call that method to guarantee that everything is
initialized.
93 lines
2.7 KiB
Java
93 lines
2.7 KiB
Java
package org.thoughtcrime.securesms.service;
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import android.app.AlarmManager;
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import android.app.Application;
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import android.app.PendingIntent;
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import android.content.Context;
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import android.content.Intent;
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import android.os.Handler;
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import android.os.HandlerThread;
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import androidx.annotation.AnyThread;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.annotation.WorkerThread;
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import org.thoughtcrime.securesms.util.ServiceUtil;
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/**
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* Class to help manage scheduling events to happen in the future, whether the app is open or not.
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*/
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public abstract class TimedEventManager<E> {
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private final Application application;
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private final Handler handler;
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public TimedEventManager(@NonNull Application application, @NonNull String threadName) {
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HandlerThread handlerThread = new HandlerThread(threadName);
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handlerThread.start();
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this.application = application;
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this.handler = new Handler(handlerThread.getLooper());
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}
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/**
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* Should be called whenever the underlying data of events has changed. Will appropriately
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* schedule new event executions.
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*/
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public void scheduleIfNecessary() {
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handler.removeCallbacksAndMessages(null);
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handler.post(() -> {
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E event = getNextClosestEvent();
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if (event != null) {
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long delay = getDelayForEvent(event);
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handler.postDelayed(() -> {
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executeEvent(event);
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scheduleIfNecessary();
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}, delay);
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scheduleAlarm(application, delay);
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}
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});
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}
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/**
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* @return The next event that should be executed, or {@code null} if there are no events to execute.
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*/
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@WorkerThread
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protected @Nullable abstract E getNextClosestEvent();
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/**
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* Execute the provided event.
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*/
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@WorkerThread
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protected abstract void executeEvent(@NonNull E event);
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/**
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* @return How long before the provided event should be executed.
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*/
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@WorkerThread
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protected abstract long getDelayForEvent(@NonNull E event);
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/**
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* Schedules an alarm to call {@link #scheduleIfNecessary()} after the specified delay. You can
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* use {@link #setAlarm(Context, long, Class)} as a helper method.
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*/
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@AnyThread
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protected abstract void scheduleAlarm(@NonNull Application application, long delay);
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/**
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* Helper method to set an alarm.
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*/
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protected static void setAlarm(@NonNull Context context, long delay, @NonNull Class alarmClass) {
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Intent intent = new Intent(context, alarmClass);
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PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
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AlarmManager alarmManager = ServiceUtil.getAlarmManager(context);
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alarmManager.cancel(pendingIntent);
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alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + delay, pendingIntent);
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}
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}
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