package org.gcube.data.publishing.gCatFeeder.service.engine.impl;

import java.util.concurrent.ThreadPoolExecutor;

import javax.inject.Singleton;

import org.gcube.data.publishing.gCatFeeder.service.engine.ExecutionManager;
import org.gcube.data.publishing.gCatFeeder.service.model.ExecutionDescriptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Singleton
public class ExecutionManagerImpl implements ExecutionManager {

	private ThreadPoolExecutor executor=null; 
	private static final Logger log= LoggerFactory.getLogger(ExecutionManagerImpl.class);
	

	@Override
	public synchronized void submit(ExecutionDescriptor desc) {
		log.debug("Checking if {} is already in queue");
		ExecutionTask toSubmit=new ExecutionTask(desc);
		if(!executor.getQueue().contains(toSubmit)) {
			log.trace("Inserting execution in queue {} ");
			executor.execute(toSubmit);
		}
	}

	@Override
	public void stop() {
		// Clear queue
		// Stop all 
	}

	@Override
	public void load() {
		// connect to persistence
		// load all pending
		throw new RuntimeException("NOT YET IMPLEMENTED");
	}

	@Override
	public synchronized void init(ExecutionManagerConfiguration config) {
		// NEED TO BE IDEMPOTENT
		if(executor==null) {
			throw new RuntimeException("NOT YET IMPLEMENTED");
//			executor=new ThreadPoolExecutor(corePoolSize, maximumPoolSize, keepAliveTime, unit, new ConcurrentLinkedQueue<ExecutionTask>());
		}
	}

}