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/*
 * JPPF.
 * Copyright (C) 2005-2015 JPPF Team.
 * http://www.jppf.org
 *
 * 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 org.jppf.nio;

import org.jppf.utils.JPPFConfiguration;
import org.jppf.utils.configuration.ConfigurationHelper;
import org.slf4j.*;

/**
 * 
 * @author Laurent Cohen
 * @exclude
 */
public class NioConstants {
  /**
   * Logger for this class.
   */
  static Logger log = LoggerFactory.getLogger(NioConstants.class);
  /**
   * Size of the pool of threads for the state transition executor.
   * It is defined as the value of the configuration property
   * "jppf.transition.thread.pool.size", with a default value of 1.
   */
  public static final int THREAD_POOL_SIZE = computeNIOPoolSize();
  /**
   * Name of the class server.
   */
  public static final String CLASS_SERVER = "ClassServer";
  /**
   * Name of the client class server.
   */
  public static final String CLIENT_CLASS_SERVER = "ClientClassServer";
  /**
   * Name of the node class server.
   */
  public static final String NODE_CLASS_SERVER = "NodeClassServer";
  /**
   * Name of the class server.
   */
  public static final String NODE_SERVER = "NodeJobServer";
  /**
   * Name of the client task server.
   */
  public static final String CLIENT_SERVER = "ClientJobServer";
  /**
   * Name of the acceptor server server.
   */
  public static final String ACCEPTOR = "Acceptor";
  /**
   * Default timeout for Selector.select(long) operations.
   */
  public static final long DEFAULT_SELECT_TIMEOUT = JPPFConfiguration.getProperties().getLong("jppf.nio.select.timeout", 1000L);
  /**
   * Workaround for the issue described in this forum thread.
   */
  public static final boolean CHECK_CONNECTION = getCheckConnection();

  /**
   * Determine whether nio checks are enabled, and log accordingly.
   * @return true if NIO checks are enabled, false otherwise.
   */
  private static boolean getCheckConnection() {
    boolean b = JPPFConfiguration.getProperties().getBoolean("jppf.nio.check.connection", true);
    log.info("NIO checks are " + (b ? "enabled" : "disabled"));
    return b;
  }

  /**
   * Compute the size of the transition manager's thread pool size.
   * @return the pool size as an int.
   */
  private static int computeNIOPoolSize() {
    int n = new ConfigurationHelper(JPPFConfiguration.getProperties()).getInt("jppf.transition.thread.pool.size", "transition.thread.pool.size", Runtime.getRuntime().availableProcessors(), 1,
        32 * 1024);
    if (n < 2) n = 2;
    return n;
  }
}