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package net.lacolaco.smileessence.util;
import android.os.AsyncTask;
import net.lacolaco.smileessence.logging.Logger;
public abstract class BackgroundTask<Result, Progress> {
private Consumer<Result> then;
private Consumer<Progress> progress;
private Consumer<Exception> fail;
private Exception exception;
private final InnerAsyncTask task;
public BackgroundTask() {
this.task = new InnerAsyncTask();
}
public BackgroundTask<Result, Progress> onDone(Consumer<Result> cb) {
this.then = cb;
return this;
}
public BackgroundTask<Result, Progress> onProgress(Consumer<Progress> cb) {
this.progress = cb;
return this;
}
public BackgroundTask<Result, Progress> onFail(Consumer<Exception> cb) {
this.fail = cb;
return this;
}
public BackgroundTask<Result, Progress> onDoneUI(Consumer<Result> cb) {
return onDone(r -> new UIHandler().post(() -> cb.accept(r)));
}
public BackgroundTask<Result, Progress> onProgressUI(Consumer<Progress> cb) {
return onProgress(p -> new UIHandler().post(() -> cb.accept(p)));
}
public BackgroundTask<Result, Progress> onFailUI(Consumer<Exception> cb) {
return onFail(e -> new UIHandler().post(() -> cb.accept(e)));
}
public boolean cancel() {
return task.cancel(true);
}
public final BackgroundTask<Result, Progress> execute() {
task.execute();
return this;
}
public final Result getImmediately() throws Exception {
Result result = task.get();
if (exception == null) {
return result;
} else {
throw exception;
}
}
protected void fail(Exception ex) {
exception = ex;
ex.printStackTrace();
Logger.error(ex);
if (!task.isCancelled() && fail != null) {
fail.accept(ex);
}
}
protected void progress(Progress value) {
if (!task.isCancelled() && exception == null && progress != null) {
progress.accept(value);
}
}
protected abstract Result doInBackground() throws Exception;
private class InnerAsyncTask extends AsyncTask<Void, Progress, Result> {
@Override
protected final void onPostExecute(Result result) {
if (!isCancelled() && exception == null && then != null) {
then.accept(result);
}
}
@Override
protected Result doInBackground(Void... params) {
try {
return BackgroundTask.this.doInBackground();
} catch (Exception ex) {
fail(ex);
return null;
}
}
}
}
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