deep-c-rsc/JCGO/classpath-0.93/org/omg/PortableServer/ThreadPolicyValue.java

/* ThreadPolicyValue.java --
   Copyright (C) 2005, 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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package org.omg.PortableServer;

import gnu.CORBA.Minor;

import org.omg.CORBA.BAD_OPERATION;
import org.omg.CORBA.BAD_PARAM;
import org.omg.CORBA.portable.IDLEntity;

import java.io.Serializable;

/**
 * Defines the possible values for the POA thread policy.
 *
 * This enumeration can obtain the following values:
 * <ul>
 * <li>ORB_CTRL_MODEL Each object in POA has a separate serving thread
 * and a separate server socket, listening on the objects individual
 * port. Additionally, when the request is accepted, it is also
 * served in a separate thread, so several requests to the same
 * object can be processed in parallel. The servant can always get
 * the Id and POA of the object it is currently serving by
 * invoking {@link Servant#_object_id()} and {@link Servant#_poa}.
 * These two methods use thread to data map and must work correctly
 * even then the servant code is executed in several parallel threads.
 * </li>
 * <li>SINGLE_THREAD_MODEL All objects in POA share the same server
 * socket and are served in the same thread. This model is applicable
 * when the number of objects is greater than the number of threads
 * and (or) ports, supported by the system.</li>
 * </ul>
 * OMG also defines a MAIN_THREAD_MODEL, currently not supported by
 * the java API.
 *
 * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
 */
public class ThreadPolicyValue
  implements Serializable, IDLEntity
{
  /**
   * Use serialVersionUID (v1.4) for interoperability.
   */
  private static final long serialVersionUID = -8874988828297141512L;

  /**
   * The value field for the current instance.
   */
  private final int _value;

  /**
  * The possible value of this enumeration (ORB_CTRL_MODEL).
  */
  public static final int _ORB_CTRL_MODEL = 0;

  /**
   * An instance of ThreadPolicyValue, initialized to ORB_CTRL_MODEL.
   */
  public static final ThreadPolicyValue ORB_CTRL_MODEL =
    new ThreadPolicyValue(_ORB_CTRL_MODEL);

  /**
  * The possible value of this enumeration (SINGLE_THREAD_MODEL).
  */
  public static final int _SINGLE_THREAD_MODEL = 1;

  /**
   * An instance of ThreadPolicyValue, initialized to SINGLE_THREAD_MODEL.
   */
  public static final ThreadPolicyValue SINGLE_THREAD_MODEL =
    new ThreadPolicyValue(_SINGLE_THREAD_MODEL);

  /**
   * The private array that maps integer codes to the enumeration
   * values.
   */
  private static final ThreadPolicyValue[] enume =
    new ThreadPolicyValue[] { ORB_CTRL_MODEL, SINGLE_THREAD_MODEL };

  /**
   * The private array of state names.
   */
  private static final String[] state_names =
    new String[] { "ORB_CTRL_MODEL", "SINGLE_THREAD_MODEL" };

  /**
   * Normally, no new instances are required, so the constructor is protected.
   */
  protected ThreadPolicyValue(int a_value)
  {
    _value = a_value;
  }

  /**
   * Returns the ThreadPolicyValue, matching the given integer constant.
   *
   * @param code one of _ORB_CTRL_MODEL, _SINGLE_THREAD_MODEL.
   * @return one of ORB_CTRL_MODEL, SINGLE_THREAD_MODEL.
   * @throws BAD_PARAM if the parameter is not one of the valid values.
   */
  public static ThreadPolicyValue from_int(int code)
  {
    try
      {
        return enume [ code ];
      }
    catch (ArrayIndexOutOfBoundsException ex)
      {
        BAD_OPERATION bad = new BAD_OPERATION("Invalid policy code " + code);
        bad.minor = Minor.PolicyType;
        throw bad;
      }
  }

  /**
   * Returns a short string representation.
   * @return the name of the current enumeration value.
   */
  public String toString()
  {
    return state_names [ _value ];
  }

  /**
   * Returns the integer code of the enumeration value.
   * @return one of ORB_CTRL_MODEL, SINGLE_THREAD_MODEL.
   */
  public int value()
  {
    return _value;
  }
}