/*
 * Copyright (c) 1998-2015 Caucho Technology -- all rights reserved
 *
 * This file is part of Baratine(TM)
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Baratine is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Baratine is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Baratine; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.v5.amp.util;

import io.baratine.service.Result;

import java.util.ArrayList;
import java.util.Objects;


/**
 * List of results, used when multiple callers are waiting for a result.
 */
public class ResultList<X> implements Result<X>
{
  private ArrayList<Result<X>> _results = new ArrayList<>();
  
  public void add(Result<X> result)
  {
    Objects.requireNonNull(result);
    
    _results.add(result);
  }

  @Override
  public void ok(X value)
  {
    for (Result<X> result : _results) {
      result.ok(value);
    }
    
    _results.clear();
  }
  
  @Override
  public void fail(Throwable exn)
  {
    for (Result<X> result : _results) {
      result.fail(exn);
    }
    
    _results.clear();
  }
  
  @Override
  public void handle(X value, Throwable exn)
  {
    if (exn != null) {
      fail(exn);
    }
    else {
      ok(value);
    }
  }
}
