/*
 * Copyright 2012-2017 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat 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 2, or (at your
 * option) any later version.
 *
 * Thermostat 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 Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.common.internal;

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

import com.redhat.thermostat.common.ApplicationCache;
import com.redhat.thermostat.common.ApplicationService;
import com.redhat.thermostat.common.ThreadPoolTimerFactory;
import com.redhat.thermostat.common.TimerFactory;

public class ApplicationServiceImpl implements ApplicationService {

    private ApplicationCache cache = new ApplicationCache();

    // NOTE: When merging with ApplicationContext, this could be provided by the same
    // thread pool that does the timer scheduling. Not sure we want this though,
    // as scheduled thread pools are always limited in number of threads (could lead to deadlocks
    // when used carelessly).
    private ExecutorService executor = Executors.newCachedThreadPool();

    private TimerFactory timers;

    public ApplicationServiceImpl() {
        // TODO merge with QueuedStorage's determine-number-of-threads implementation
        int poolSize = Runtime.getRuntime().availableProcessors() * 2;
        timers = new ThreadPoolTimerFactory(poolSize);
    }

    @Override
    public ApplicationCache getApplicationCache() {
        return cache;
    }

    @Override
    public ExecutorService getApplicationExecutor() {
        return executor;
    }

    @Override
    public TimerFactory getTimerFactory() {
        return timers;
    }
}