package eu.faircode.email;
/*
This file is part of FairEmail.
FairEmail is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
FairEmail is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FairEmail. If not, see .
Copyright 2018 by Marcel Bokhorst (M66B)
*/
import android.os.Handler;
import android.util.Log;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import androidx.lifecycle.GenericLifecycleObserver;
import androidx.lifecycle.Lifecycle;
import androidx.lifecycle.LifecycleOwner;
import androidx.paging.PagedList;
public class BoundaryCallbackMessages extends PagedList.BoundaryCallback {
private ViewModelBrowse model;
private Handler handler;
private IBoundaryCallbackMessages intf;
private boolean searching = false;
private static ExecutorService executor = Executors.newSingleThreadExecutor(Helper.backgroundThreadFactory);
interface IBoundaryCallbackMessages {
void onLoading();
void onLoaded();
void onError(Throwable ex);
}
BoundaryCallbackMessages(LifecycleOwner owner, ViewModelBrowse _model, IBoundaryCallbackMessages intf) {
this.model = _model;
this.handler = new Handler();
this.intf = intf;
owner.getLifecycle().addObserver(new GenericLifecycleObserver() {
@Override
public void onStateChanged(LifecycleOwner source, Lifecycle.Event event) {
if (event == Lifecycle.Event.ON_DESTROY)
executor.submit(new Runnable() {
@Override
public void run() {
model.clear();
model = null;
}
});
}
});
}
boolean isSearching() {
return searching;
}
@Override
public void onZeroItemsLoaded() {
Log.i(Helper.TAG, "onZeroItemsLoaded");
load();
}
@Override
public void onItemAtEndLoaded(final TupleMessageEx itemAtEnd) {
Log.i(Helper.TAG, "onItemAtEndLoaded");
load();
}
private void load() {
if (model != null)
executor.submit(new Runnable() {
@Override
public void run() {
try {
searching = true;
handler.post(new Runnable() {
@Override
public void run() {
intf.onLoading();
}
});
model.load();
} catch (final Throwable ex) {
Log.e(Helper.TAG, "Boundary " + ex + "\n" + Log.getStackTraceString(ex));
handler.post(new Runnable() {
@Override
public void run() {
intf.onError(ex);
}
});
} finally {
searching = false;
handler.post(new Runnable() {
@Override
public void run() {
intf.onLoaded();
}
});
}
}
});
}
}