package io.dropwizard.lifecycle.setup;

import com.codahale.metrics.MetricRegistry;
import io.dropwizard.lifecycle.JettyManaged;
import io.dropwizard.lifecycle.Managed;
import io.dropwizard.lifecycle.ServerLifecycleListener;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.util.component.AbstractLifeCycle;
import org.eclipse.jetty.util.component.ContainerLifeCycle;
import org.eclipse.jetty.util.component.LifeCycle;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ThreadFactory;

import static java.util.Objects.requireNonNull;

public class LifecycleEnvironment {
    private static final Logger LOGGER = LoggerFactory.getLogger(LifecycleEnvironment.class);

    private final List<LifeCycle> managedObjects;
    private final List<LifeCycle.Listener> lifecycleListeners;
    private final MetricRegistry metricRegistry;

    public LifecycleEnvironment(MetricRegistry metricRegistry) {
        this.managedObjects = new ArrayList<>();
        this.lifecycleListeners = new ArrayList<>();
        this.metricRegistry = metricRegistry;
    }

    public List<LifeCycle> getManagedObjects() {
        return managedObjects;
    }

    
Adds the given Managed instance to the set of objects managed by the server's lifecycle. When the server starts, managed will be started. When the server stops, managed will be stopped. 
Params:
managed – a managed object/**
     * Adds the given {@link Managed} instance to the set of objects managed by the server's
     * lifecycle. When the server starts, {@code managed} will be started. When the server stops,
     * {@code managed} will be stopped.
     *
     * @param managed a managed object
     */
    public void manage(Managed managed) {
        managedObjects.add(new JettyManaged(requireNonNull(managed)));
    }

    
Adds the given Jetty LifeCycle instances to the server's lifecycle. 
Params:
managed – a Jetty-managed object/**
     * Adds the given Jetty {@link LifeCycle} instances to the server's lifecycle.
     *
     * @param managed a Jetty-managed object
     */
    public void manage(LifeCycle managed) {
        managedObjects.add(requireNonNull(managed));
    }

    public ExecutorServiceBuilder executorService(String nameFormat) {
        return new ExecutorServiceBuilder(this, nameFormat);
    }

    public ExecutorServiceBuilder executorService(String nameFormat, ThreadFactory factory) {
        return new ExecutorServiceBuilder(this, nameFormat, factory);
    }

    public ScheduledExecutorServiceBuilder scheduledExecutorService(String nameFormat) {
        return scheduledExecutorService(nameFormat, false);
    }

    public ScheduledExecutorServiceBuilder scheduledExecutorService(String nameFormat, ThreadFactory factory) {
        return new ScheduledExecutorServiceBuilder(this, nameFormat, factory);
    }

    public ScheduledExecutorServiceBuilder scheduledExecutorService(String nameFormat, boolean useDaemonThreads) {
        return new ScheduledExecutorServiceBuilder(this, nameFormat, useDaemonThreads);
    }

    public void addServerLifecycleListener(ServerLifecycleListener listener) {
        lifecycleListeners.add(new ServerListener(listener));
    }

    public void addLifeCycleListener(LifeCycle.Listener listener) {
        lifecycleListeners.add(listener);
    }

    public void attach(ContainerLifeCycle container) {
        for (LifeCycle object : managedObjects) {
            container.addBean(object);
        }
        container.addLifeCycleListener(new AbstractLifeCycle.AbstractLifeCycleListener() {
            @Override
            public void lifeCycleStarting(LifeCycle event) {
                LOGGER.debug("managed objects = {}", managedObjects);
            }
        });
        for (LifeCycle.Listener listener : lifecycleListeners) {
            container.addLifeCycleListener(listener);
        }
    }

    
Since:
2.0/**
     * @since 2.0
     */
    public MetricRegistry getMetricRegistry() {
        return metricRegistry;
    }

    private static class ServerListener extends AbstractLifeCycle.AbstractLifeCycleListener {
        private final ServerLifecycleListener listener;

        private ServerListener(ServerLifecycleListener listener) {
            this.listener = listener;
        }

        @Override
        public void lifeCycleStarted(LifeCycle event) {
            if (event instanceof Server) {
                listener.serverStarted((Server) event);
            }
        }
    }
}