1 /* GiopNamingServiceFactory.java -- handles corbaname: urls 2 Copyright (C) 2006 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 39 package gnu.javax.naming.giop; 40 41 import gnu.CORBA.OrbFunctional; 42 43 import gnu.java.lang.CPStringBuilder; 44 45 import java.util.Enumeration; 46 import java.util.Hashtable; 47 import java.util.Iterator; 48 import java.util.Map; 49 import java.util.Properties; 50 import java.util.TreeMap; 51 52 import javax.naming.Context; 53 import javax.naming.Name; 54 55 import org.omg.CORBA.ORB; 56 57 /** 58 * The context factory to represent the corbaname: style urls. Such URL states 59 * that the CORBA naming service exists on the given host. This service can 60 * return the required object, finding it by the given name. The names are 61 * parsed using the specification of the corbaname urls. Being the naming 62 * service, the returned context supports creating the subcontexts, forwarding 63 * this task to the existing naming service. 64 * 65 * @author Audrius Meskauskas (audriusa@Bioinformatics.org) 66 */ 67 public class GiopNamingServiceFactory 68 { 69 /** 70 * The default naming service provider. It is assumed, that the naming service 71 * is running on the port 900 of the local host, using the GIOP version 1.2 72 */ 73 public static final String DEFAULT_PROVIDER = 74 "corbaloc:iiop:1.2@127.0.0.1:900/NameService"; 75 76 /** 77 * The table of all instantiated ORB's that are found by they ORB 78 * properties signatures. If all ORB related properties are the same, 79 * the ORB's are shared. 80 */ 81 public static Hashtable orbs = new Hashtable(); 82 83 84 /** 85 * Create a new instance of the corbaname URL context. 86 */ getObjectInstance(Object refObj, Name name, Context nameCtx, Hashtable environment)87 public Object getObjectInstance(Object refObj, Name name, Context nameCtx, 88 Hashtable environment) 89 { 90 String provider = (String) environment.get(Context.PROVIDER_URL); 91 if (provider == null) 92 provider = DEFAULT_PROVIDER; 93 94 String orbSignature = getOrbSignature(environment); 95 96 ORB orb; 97 synchronized (orbs) 98 { 99 orb = (ORB) orbs.get(orbSignature); 100 if (orb == null) 101 { 102 Properties props = new Properties(); 103 props.putAll(environment); 104 orb = ORB.init(new String[0], props); 105 orbs.put(orbSignature, orb); 106 final ORB runIt = orb; 107 new Thread() 108 { 109 public void run() 110 { 111 runIt.run(); 112 } 113 }.start(); 114 } 115 } 116 117 return new GiopNamingServiceURLContext(environment, this, orb); 118 } 119 120 /** 121 * Check if this ORB is still in use (maybe it is time to shutdown it). This 122 * method only works when the Classpath CORBA implementation is used 123 * (otherwise it return without action). The method is called from the close() 124 * method of the created context. 125 * 126 * @param orb 127 * the ORB that maybe is no longer referenced. 128 */ checkIfReferenced(ORB orb)129 public void checkIfReferenced(ORB orb) 130 { 131 synchronized (orbs) 132 { 133 // We can only do this with the Classpath implementation. 134 if (orb instanceof OrbFunctional) 135 { 136 OrbFunctional cOrb = (OrbFunctional) orb; 137 // If there are no connected objects, we can destroy the orb. 138 if (cOrb.countConnectedObjects() == 0) 139 { 140 cOrb.shutdown(false); 141 cOrb.destroy(); 142 143 Enumeration keys = orbs.keys(); 144 Object key; 145 Remove: while (keys.hasMoreElements()) 146 { 147 key = keys.nextElement(); 148 if (orbs.get(key) == orb) 149 { 150 orbs.remove(key); 151 break Remove; 152 } 153 } 154 } 155 } 156 } 157 } 158 159 /** 160 * Get all properties. 161 */ getOrbSignature(Map props)162 public String getOrbSignature(Map props) 163 { 164 TreeMap map = new TreeMap(); 165 map.putAll(props); 166 CPStringBuilder b = new CPStringBuilder(50*props.size()); 167 168 Iterator iter = map.entrySet().iterator(); 169 Map.Entry m; 170 while (iter.hasNext()) 171 { 172 m = (Map.Entry) iter.next(); 173 b.append(m.getKey()); 174 b.append('='); 175 b.append(m.getValue()); 176 } 177 return b.toString(); 178 } 179 } 180