GerritController.java

public static final class GerritController {
  
  private static PluginImpl getActivePlugin() {
    PluginImpl plugin = Jenkins.getInstance().getPlugin(PluginImpl.class);
    if (plugin != null && plugin.isActive()) {
      return plugin;
    }
    return null;
  }
  
  public static void postEvent(String event) {
    PluginImpl plugin = getActivePlugin();
    if (plugin != null) {
      plugin.getHandler().post(event);
    }
  }

GerritControlTask.java

public class GerritControlTask inplements Runnable {

  abstract void exec();
  
  @Override
  protected void run() {
    exec();
  }
}

GerritPostEventTask.java

public final class GerritPostEventTask extends GerritControlTask {
  
  private final String event;
  
  public GerritPostEventTask(String event) {
    this.event = event;
  }

  @Override
  public void exec() {
    GerritController.postEvent(event);
  }
}

PluginImpl.java

public class PluginImpl extends Plugin {
  private final ExecutorService controlService = Executors.newSingleThreadExecutor();
  
  public commitTask(ControlTask task) {
    controlServie.submit(task);
  }
}