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package eu.faircode.email;
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/*
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This file is part of FairEmail.
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FairEmail is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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NetGuard is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with NetGuard. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2018 by Marcel Bokhorst (M66B)
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*/
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import android.content.Context;
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import android.os.Bundle;
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import android.os.Handler;
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import android.util.Log;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import androidx.appcompat.app.AppCompatActivity;
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import androidx.fragment.app.Fragment;
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import androidx.lifecycle.Lifecycle;
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import androidx.lifecycle.LifecycleObserver;
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import androidx.lifecycle.LifecycleOwner;
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import androidx.lifecycle.LifecycleService;
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import androidx.lifecycle.OnLifecycleEvent;
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//
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// This simple task is simple to use, but it is also simple to cause bugs that can easily lead to crashes
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// Make sure to not access any member in any outer scope from onLoad
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// Results will not be delivered to destroyed fragments
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//
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public abstract class SimpleTask<T> implements LifecycleObserver {
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private LifecycleOwner owner;
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private boolean paused;
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private Bundle args;
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private Result stored;
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private ExecutorService executor = Executors.newCachedThreadPool(Helper.backgroundThreadFactory);
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public void load(Context context, LifecycleOwner owner, Bundle args) {
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run(context, owner, args);
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}
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public void load(LifecycleService service, Bundle args) {
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run(service, service, args);
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}
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public void load(AppCompatActivity activity, Bundle args) {
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run(activity, activity, args);
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}
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public void load(final Fragment fragment, Bundle args) {
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try {
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run(fragment.getContext(), fragment.getViewLifecycleOwner(), args);
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} catch (IllegalStateException ex) {
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Log.w(Helper.TAG, ex + "\n" + Log.getStackTraceString(ex));
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}
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}
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@OnLifecycleEvent(Lifecycle.Event.ON_START)
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public void onStart() {
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Log.i(Helper.TAG, "Start task " + this);
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}
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@OnLifecycleEvent(Lifecycle.Event.ON_STOP)
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public void onStop() {
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Log.i(Helper.TAG, "Stop task " + this);
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}
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@OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
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public void onResume() {
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Log.i(Helper.TAG, "Resume task " + this);
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paused = false;
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if (stored != null) {
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Log.i(Helper.TAG, "Deferred delivery task " + this);
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deliver(args, stored);
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stored = null;
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}
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}
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@OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
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public void onPause() {
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Log.i(Helper.TAG, "Pause task " + this);
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paused = true;
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}
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@OnLifecycleEvent(Lifecycle.Event.ON_CREATE)
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public void onCreated() {
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Log.i(Helper.TAG, "Created task " + this);
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}
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@OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
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public void onDestroyed() {
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Log.i(Helper.TAG, "Destroy task " + this);
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owner.getLifecycle().removeObserver(this);
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owner = null;
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paused = true;
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args = null;
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stored = null;
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}
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private void run(final Context context, LifecycleOwner owner, final Bundle args) {
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this.owner = owner;
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this.paused = false;
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this.args = null;
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this.stored = null;
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owner.getLifecycle().addObserver(this);
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// Run in background thread
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executor.submit(new Runnable() {
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@Override
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public void run() {
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final Result result = new Result();
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try {
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result.data = onLoad(context, args);
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} catch (Throwable ex) {
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Log.e(Helper.TAG, ex + "\n" + Log.getStackTraceString(ex));
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result.ex = ex;
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}
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// Run on main thread
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new Handler(context.getMainLooper()).post(new Runnable() {
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@Override
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public void run() {
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deliver(args, result);
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}
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});
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}
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});
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}
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private void deliver(Bundle args, Result result) {
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if (paused) {
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Log.i(Helper.TAG, "Deferring delivery task " + this);
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this.args = args;
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this.stored = result;
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} else {
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Log.i(Helper.TAG, "Delivery task " + this);
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try {
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if (result.ex == null)
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onLoaded(args, (T) result.data);
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else
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onException(args, result.ex);
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} catch (Throwable ex) {
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Log.e(Helper.TAG, ex + "\n" + Log.getStackTraceString(ex));
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} finally {
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onDestroyed();
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}
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}
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}
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protected T onLoad(Context context, Bundle args) throws Throwable {
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// Be careful not to access members in outer scopes
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return null;
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}
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protected void onLoaded(Bundle args, T data) {
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}
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protected void onException(Bundle args, Throwable ex) {
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}
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private static class Result {
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Throwable ex;
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Object data;
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}
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}
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