001/* ThreadPolicyValue.java -- 002 Copyright (C) 2005, 2006 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package org.omg.PortableServer; 040 041import gnu.CORBA.Minor; 042 043import org.omg.CORBA.BAD_OPERATION; 044import org.omg.CORBA.BAD_PARAM; 045import org.omg.CORBA.portable.IDLEntity; 046 047import java.io.Serializable; 048 049/** 050 * Defines the possible values for the POA thread policy. 051 * 052 * This enumeration can obtain the following values: 053 * <ul> 054 * <li>ORB_CTRL_MODEL Each object in POA has a separate serving thread 055 * and a separate server socket, listening on the objects individual 056 * port. Additionally, when the request is accepted, it is also 057 * served in a separate thread, so several requests to the same 058 * object can be processed in parallel. The servant can always get 059 * the Id and POA of the object it is currently serving by 060 * invoking {@link Servant#_object_id()} and {@link Servant#_poa}. 061 * These two methods use thread to data map and must work correctly 062 * even then the servant code is executed in several parallel threads. 063 * </li> 064 * <li>SINGLE_THREAD_MODEL All objects in POA share the same server 065 * socket and are served in the same thread. This model is applicable 066 * when the number of objects is greater than the number of threads 067 * and (or) ports, supported by the system.</li> 068 * </ul> 069 * OMG also defines a MAIN_THREAD_MODEL, currently not supported by 070 * the java API. 071 * 072 * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org) 073 */ 074public class ThreadPolicyValue 075 implements Serializable, IDLEntity 076{ 077 /** 078 * Use serialVersionUID (v1.4) for interoperability. 079 */ 080 private static final long serialVersionUID = -8874988828297141512L; 081 082 /** 083 * The value field for the current instance. 084 */ 085 private final int _value; 086 087 /** 088 * The possible value of this enumeration (ORB_CTRL_MODEL). 089 */ 090 public static final int _ORB_CTRL_MODEL = 0; 091 092 /** 093 * An instance of ThreadPolicyValue, initialized to ORB_CTRL_MODEL. 094 */ 095 public static final ThreadPolicyValue ORB_CTRL_MODEL = 096 new ThreadPolicyValue(_ORB_CTRL_MODEL); 097 098 /** 099 * The possible value of this enumeration (SINGLE_THREAD_MODEL). 100 */ 101 public static final int _SINGLE_THREAD_MODEL = 1; 102 103 /** 104 * An instance of ThreadPolicyValue, initialized to SINGLE_THREAD_MODEL. 105 */ 106 public static final ThreadPolicyValue SINGLE_THREAD_MODEL = 107 new ThreadPolicyValue(_SINGLE_THREAD_MODEL); 108 109 /** 110 * The private array that maps integer codes to the enumeration 111 * values. 112 */ 113 private static final ThreadPolicyValue[] enume = 114 new ThreadPolicyValue[] { ORB_CTRL_MODEL, SINGLE_THREAD_MODEL }; 115 116 /** 117 * The private array of state names. 118 */ 119 private static final String[] state_names = 120 new String[] { "ORB_CTRL_MODEL", "SINGLE_THREAD_MODEL" }; 121 122 /** 123 * Normally, no new instances are required, so the constructor is protected. 124 */ 125 protected ThreadPolicyValue(int a_value) 126 { 127 _value = a_value; 128 } 129 130 /** 131 * Returns the ThreadPolicyValue, matching the given integer constant. 132 * 133 * @param code one of _ORB_CTRL_MODEL, _SINGLE_THREAD_MODEL. 134 * @return one of ORB_CTRL_MODEL, SINGLE_THREAD_MODEL. 135 * @throws BAD_PARAM if the parameter is not one of the valid values. 136 */ 137 public static ThreadPolicyValue from_int(int code) 138 { 139 try 140 { 141 return enume [ code ]; 142 } 143 catch (ArrayIndexOutOfBoundsException ex) 144 { 145 BAD_OPERATION bad = new BAD_OPERATION("Invalid policy code " + code); 146 bad.minor = Minor.PolicyType; 147 throw bad; 148 } 149 } 150 151 /** 152 * Returns a short string representation. 153 * @return the name of the current enumeration value. 154 */ 155 public String toString() 156 { 157 return state_names [ _value ]; 158 } 159 160 /** 161 * Returns the integer code of the enumeration value. 162 * @return one of ORB_CTRL_MODEL, SINGLE_THREAD_MODEL. 163 */ 164 public int value() 165 { 166 return _value; 167 } 168}