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package ars.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 系统后台服务抽象实现
 *
 * @author wuyongqiang
 */
public abstract class AbstractServer implements Server, Runnable {
    private Thread thread;
    private boolean daemon;
    protected final Logger logger = LoggerFactory.getLogger(this.getClass());

    public boolean isDaemon() {
        return daemon;
    }

    public void setDaemon(boolean daemon) {
        this.daemon = daemon;
    }

    @Override
    public void start() {
        if (this.thread == null) {
            synchronized (this) {
                if (this.thread == null) {
                    this.logger.info("Start server {}", this);
                    this.thread = new Thread(this);
                    this.thread.setDaemon(this.daemon);
                    this.thread.start();
                    Servers.register(this);
                }
            }
        }
    }

    @Override
    public void stop() {
        if (this.thread != null) {
            synchronized (this) {
                if (this.thread != null) {
                    this.logger.info("Stop server {}", this);
                    this.thread.interrupt();
                    this.thread = null;
                    Servers.unregister(this);
                }
            }
        }
    }

    @Override
    public boolean isAlive() {
        return this.thread != null && this.thread.isAlive();
    }

}