AsyncTask.java

/*
 * Public Domain @ CPMGN
 * Centre de Production Multimédia de la Gendarmerie Nationale
 */
package com.agroneo.grow.system.utils;

import android.os.Handler;
import android.os.Looper;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * The type Async task.
 *
 * @param <Result> the type parameter
 */
public abstract class AsyncTask<Result> {

    /**
     * The Executor.
     */
    private final ExecutorService executor = Executors.newSingleThreadExecutor();
    /**
     * The Handler.
     */
    private final Handler handler = new Handler(Looper.getMainLooper());
    /**
     * The Is cancelled.
     */
    private boolean isCancelled = false;

    /**
     * Is cancelled boolean.
     *
     * @return the boolean
     */
    public boolean isCancelled() {
        return isCancelled;
    }

    /**
     * Cancel.
     */
    public final void cancel() {
        isCancelled = true;
        executor.shutdownNow();
    }

    /**
     * Execute.
     *
     * @param params the params
     */
    public final void execute(Object... params) {
        executor.execute(() -> {
            Result rez = background(params);
            handler.post(() -> executed(rez));
        });
    }

    /**
     * Background result.
     *
     * @param params the params
     * @return the result
     */
    protected abstract Result background(Object... params);

    /**
     * Send progress.
     *
     * @param percent the percent
     */
    protected final void sendProgress(int percent) {

        handler.post(() -> progress(percent));
    }

    /**
     * Progress.
     *
     * @param percent the percent
     */
    protected void progress(int percent) {

    }

    /**
     * Executed.
     *
     * @param result the result
     */
    protected void executed(Result result) {

    }

}