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PluginManager.java

package org.heater.core.plugin;

import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.multibindings.Multibinder;
import org.heater.api.HeaterActivator;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

public class PluginManager {
    private final List<HeaterActivator> instances;
    private AbstractModule module;

    @Inject Set<HeaterActivator> plugins;

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

    public PluginManager initialize() {
        //TODO: insert modules main class
        return this;
    }

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

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

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

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

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