;)

PluginHandler.java

package org.heater.core.plugin;

import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.Module;
import com.google.inject.multibindings.Multibinder;
import net.xeoh.plugins.base.PluginManager;
import net.xeoh.plugins.base.impl.PluginManagerFactory;
import net.xeoh.plugins.base.options.GetPluginOption;
import net.xeoh.plugins.base.options.addpluginsfrom.OptionReportAfter;
import net.xeoh.plugins.base.util.PluginManagerUtil;
import org.heater.api.HeaterActivator;

import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.*;

public class PluginHandler {
    private final List<HeaterActivator> instances;
    private Module module;

    @Inject Set<HeaterActivator> plugins;

    public PluginHandler() {
        this.instances = new ArrayList<>();
    }

    public PluginHandler initialize() {
        PluginManagerUtil manager = new PluginManagerUtil(PluginManagerFactory.createPluginManager());
        manager.addPluginsFrom(new File("plugins/").toURI());

        for(HeaterActivator plugin: manager.getPlugins(HeaterActivator.class))
            instances.add(plugin);
        return this;
    }

    public void terminate() {
        if(plugins == null) return;

        for(HeaterActivator plugin: plugins)
            plugin.stop();
    }

    public void installPlugins() {
        if(plugins == null) return;

        for(HeaterActivator plugin: plugins)
            plugin.start();
    }

    private Module buildModule() {
        return new AbstractModule() {
            @Override
            protected void configure() {
                bind(PluginHandler.class).toInstance(PluginHandler.this);

                Multibinder<HeaterActivator> binder = Multibinder.newSetBinder(binder(), HeaterActivator.class);
                for(HeaterActivator instance: instances) {
                    binder.addBinding().toInstance(instance);
                    install(instance.pluginModule());
                }
            }
        };
    }

    public Module getModule() {
        return module != null ? module : (module = buildModule());
    }
}