/*
 * Copyright 2013-2016 consulo.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package consulo.web.servlet.ui;

import consulo.ui.RequiredUIAccess;

import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

/**
 * @author VISTALL
 * @since 11-Jun-16
 */
public class UIAccessHelper {
  public static final UIAccessHelper ourInstance = new UIAccessHelper();

  private Executor myUIExecutor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

  private static ThreadLocal<GwtUIAccess> ourLocal = new ThreadLocal<GwtUIAccess>();

  public void run(final GwtUIAccess context, @RequiredUIAccess final Runnable runnable) {
    if (!context.getSession().isOpen()) {
      return;
    }
    myUIExecutor.execute(new Runnable() {
      @Override
      public void run() {
        ourLocal.set(context);

        runnable.run();

        context.repaint();

        ourLocal.set(null);
      }
    });
  }

  public boolean isUIThread() {
    return ourLocal.get() != null;
  }

  public GwtUIAccess get() {
    return ourLocal.get();
  }
}