D-Net

package eu.dnetlib.msro.workflows.procs;

import java.util.concurrent.Executors;

import java.util.concurrent.TimeUnit;

import javax.annotation.PostConstruct;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Component;

import eu.dnetlib.enabling.common.Stoppable;

import eu.dnetlib.enabling.common.StoppableDetails;

import eu.dnetlib.msro.exceptions.MSROException;

import eu.dnetlib.msro.workflows.WorkflowsConstants;

@Component

public class ProcessExecutor implements Stoppable {

	@Autowired

	private ProcessEngine processEngine;

	@Autowired

	private ProcessRegistry processRegistry;

	private boolean paused = false;

	private static final Log log = LogFactory.getLog(ProcessExecutor.class);

	@PostConstruct

	public void init() {

		Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(() -> {

			if (isPaused() || (processRegistry.countRunningWfs() >= WorkflowsConstants.MAX_RUNNING_PROCS_SIZE)) { return; }

			final WorkflowProcess process = processRegistry.nextProcessToStart();

			if (process != null) {

				processEngine.startProcess(process);

			} else {

				log.debug("WorkflowProcess queue is empty");

			}

		}, 10, 10, TimeUnit.SECONDS);

	}

	public void execute(final WorkflowProcess proc) throws MSROException {

		processRegistry.registerProcess(proc);

	}

	@Override

	public void stop() {

		paused = true;

	}

	@Override

	public void resume() {

		paused = false;

	}

	@Override

	public StoppableDetails getStopDetails() {

		final int count = processRegistry.countRunningWfs();

		final StoppableDetails.StopStatus status =

				isPaused() ? (count == 0 ? StoppableDetails.StopStatus.STOPPED : StoppableDetails.StopStatus.STOPPING) : StoppableDetails.StopStatus.RUNNING;

		return new StoppableDetails("D-NET workflow manager", "Running workflows: " + count, status);

	}

	public boolean isPaused() {

		return paused;

	}

	public void setPaused(final boolean paused) {

		this.paused = paused;

	}

}