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A reactive Java web server.

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/*
 * 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.stub;

import java.util.function.Supplier;

import com.caucho.v5.amp.service.StubFactoryAmp;
import com.caucho.v5.amp.service.ServiceConfig;

/**
 * Basic method for creating actors.
 */
public class StubFactoryImpl implements StubFactoryAmp
{
  private final StubAmp _stubMain;
  private final ServiceConfig _config;
  private Supplier _stubSupplier;
  
  private StubAmp _actorFirst;

  public StubFactoryImpl(Supplier stubSupplier,
                          ServiceConfig config)
  {
    _stubSupplier = stubSupplier;
    _config = config;
    
    _stubMain = stubSupplier.get();
    _actorFirst = _stubMain;
  }
  
  @Override
  public String actorName()
  {
    return _stubMain.toString();
  }
  
  @Override
  public ServiceConfig config()
  {
    return _config;
  }

  @Override
  public StubAmp get()
  {
    if (config().workers() <= 1) {
      return _actorFirst;
    }
    else {
      StubAmp actor = _actorFirst;
      
      if (actor != null) {
        _actorFirst = null;
        return actor;
      }
      else {
        return _stubSupplier.get();
      }
    }
  }
  
  @Override
  public StubAmp stubMain()
  {
    return _stubMain;
  }
  
  @Override
  public String toString()
  {
    return getClass().getSimpleName() + "[" + _stubMain + "]";
  }
}