Goes to a set of synchronized collections (Map, HashMap, ...) to try and avoid

multithreaded issues ...

10 files changed, 168 insertions, 102 deletions

diff --git a/Changelog b/Changelog
index de1f100..a056b50 100644
--- a/Changelog
+++ b/Changelog
@@ -1,4 +1,13 @@
 --------------------------------------------------------------------
+1.2.16
+
+  New API:
+  	- IvyClient.getRegexps  no longer returns an Enumeration, but a
+	Collection
+  Internals:
+  	- switched to a lot of synchronized connections, in order to avoid
+	concurrent modifications Exceptions I was unable to prevent so far
+--------------------------------------------------------------------
 1.2.15
 
   Internals:
diff --git a/build.xml b/build.xml
index e0d1dad..0ec7c84 100644
--- a/build.xml
+++ b/build.xml
@@ -1,6 +1,6 @@
 <project name="ivy-java" basedir="." default="main">
 
-    <property name="version"     value="1.2.15"/>
+    <property name="version"     value="1.2.16"/>
     <property name="defaultbus"  value="-DIVYBUS=224.5.6.7:8910" />
 
     <property name="src.dir"     value="src"/>
diff --git a/debian/rules b/debian/rules
index d1282b7..c709168 100755
--- a/debian/rules
+++ b/debian/rules
@@ -24,7 +24,7 @@ install: build
 	dh_clean -k
 	dh_installdirs
 	$(MAKE) dist
-	$(MAKE) docs
+	#$(MAKE) docs
 	$(MAKE) install DESTDIR=$(CURDIR)/debian/tmp
 
 # Build architecture-independent files here.
diff --git a/java.mk b/java.mk
index 498d5c0..f5e3220 100644
--- a/java.mk
+++ b/java.mk
@@ -22,7 +22,8 @@ CLASSPATH = -classpath $(GNUPATH):.
 JAVA = java
 #JAVA = gij
 #JAVAC = gcj -C --encoding=8859_1 -Wall -g
-JAVAC = javac -target 1.5
+#JAVAC = javac -target 1.5
+JAVAC = javac
 #JAVAC =  /usr/local/j2sdk1.4.2/bin/javac
 #JAVACOPTS = 
 #JAVACOPTS = -target 1.2
diff --git a/src/Ivy.java b/src/Ivy.java
index 2196321..b727c2a 100755
--- a/src/Ivy.java
+++ b/src/Ivy.java
@@ -15,6 +15,8 @@
  *</pre>
  *
  *  CHANGELOG:
+ *  1.2.16
+ *    - now uses the synchronized wrappers of the Java API for all collections
  *  1.2.15
  *    - allows the fine tuning of the IvyClient socket buffersize using
  *    IVY_BUFFERSIZE property
@@ -125,9 +127,14 @@
 package fr.dgac.ivy;
 import java.net.*;
 import java.io.*;
-import java.util.*;
 import gnu.getopt.Getopt;
 import java.util.regex.*;
+import java.util.Vector;
+import java.util.Collections;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.Properties;
+import java.util.StringTokenizer;
 
 public class Ivy implements Runnable {
 
@@ -157,7 +164,7 @@ public class Ivy implements Runnable {
    * the library version, useful for development purposes only, when java is
    * invoked with -DIVY_DEBUG
    */
-  public static final String LIBVERSION ="1.2.15";
+  public static final String LIBVERSION ="1.2.16";
   public static final int TIMEOUTLENGTH = 1000;
 
   private String appName;
@@ -171,8 +178,8 @@ public class Ivy implements Runnable {
   private ServerSocket app;
   private Vector<IvyWatcher> watchers = new Vector<IvyWatcher>();
   private volatile Thread serverThread; // to ensure quick communication of the end
-  private Hashtable<Integer,IvyClient> clients = new Hashtable<Integer,IvyClient>();
-  private Hashtable<Integer,IvyClient> half = new Hashtable<Integer,IvyClient>();
+  private Map<Integer,IvyClient> clients = Collections.synchronizedMap(new HashMap<Integer,IvyClient>());
+  private Map<Integer,IvyClient> half = Collections.synchronizedMap(new HashMap<Integer,IvyClient>());
   private Vector<IvyApplicationListener> ivyApplicationListenerList = new Vector<IvyApplicationListener>();
   private Vector<IvyBindListener> ivyBindListenerList = new Vector<IvyBindListener>();
   private Vector<Thread> sendThreads = new Vector<Thread>();
@@ -265,9 +272,11 @@ public class Ivy implements Runnable {
   /*
    * since 1.2.8
    */
-  protected static IvyClient alreadyThere(final Hashtable<Integer , IvyClient> c , final String name) {
-    for (IvyClient ic : c.values()) {
-      if ((ic != null)&&(name.compareTo(ic.getApplicationName()) == 0)) return ic;
+  protected static IvyClient alreadyThere(final Map<Integer , IvyClient> c , final String name) {
+    synchronized (c) {
+      for (IvyClient ic : c.values()) {
+	if ((ic != null)&&(name.compareTo(ic.getApplicationName()) == 0)) return ic;
+      }
     }
     return null;
   }
@@ -405,10 +414,12 @@ public class Ivy implements Runnable {
       for (IvyWatcher iw: watchers) iw.doStop();
       watchers.clear();
       // stopping the remaining IvyClients
-      for (IvyClient c : clients.values()) {
-	if (c != null) {
-	  c.close(true);
-	  removeClient(c);
+      synchronized (clients) {
+	for (IvyClient c : clients.values()) {
+	  if (c != null) {
+	    c.close(true);
+	    removeClient(c);
+	  }
 	}
       }
     } catch (IOException e) {
@@ -476,7 +487,9 @@ public class Ivy implements Runnable {
       if (doProtectNewlines) msg = IvyClient.encode(message);
       else if ( (msg.indexOf(IvyClient.newLineChar) != -1)||(msg.indexOf(IvyClient.endArgChar) != -1))
 	throw new IvyException("newline character not allowed in Ivy messages");
-      for ( IvyClient client : clients.values()) if (client != null) count += client.sendMsg(msg);
+      synchronized (clients)  {
+	for ( IvyClient client : clients.values()) if (client != null) count += client.sendMsg(msg);
+      }
       if (doSendToSelf) count+=selfIvyClient.sendSelfMsg(msg);
       traceDebug("end sending "+message+" to "+count+" clients");
     }
@@ -554,7 +567,9 @@ public class Ivy implements Runnable {
     // adds the regexp to our collection in selfIvyClient
     int key = selfIvyClient.bindMsg(sregexp , callback , type);
     // notifies the other clients this new regexp
-    for (IvyClient c : clients.values() ) if (c != null) c.sendRegexp(key , sregexp);
+    synchronized (clients) {
+      for (IvyClient c : clients.values() ) if (c != null) c.sendRegexp(key , sregexp);
+    }
     return key;
   }
 
@@ -586,7 +601,9 @@ public class Ivy implements Runnable {
    */
   public final void unBindMsg(final int id) throws IvyException {
     selfIvyClient.unBindMsg(id);
-    for (IvyClient ic : clients.values() ) if (ic != null) ic.delRegexp(id );
+    synchronized (clients) {
+      for (IvyClient ic : clients.values() ) if (ic != null) ic.delRegexp(id );
+    }
   }
 
   /**
@@ -751,7 +768,9 @@ public class Ivy implements Runnable {
    */
   public final Vector<IvyClient> getIvyClients() {
     Vector<IvyClient> v = new Vector<IvyClient>();
-    for (IvyClient ic : clients.values() ) if (ic != null) v.addElement(ic);
+    synchronized (clients) {
+      for (IvyClient ic : clients.values() ) if (ic != null) v.addElement(ic);
+    }
     return v;
   }
 
@@ -764,9 +783,11 @@ public class Ivy implements Runnable {
   public final Vector<IvyClient> getIvyClientsByName(final String name) {
     Vector<IvyClient> v = new Vector<IvyClient>();
     String icname;
-    for (IvyClient ic :  clients.values() ) {
-      if ( (ic == null)||((icname = ic.getApplicationName()) == null) ) break;
-      if (icname.compareTo(name) == 0) v.addElement(ic);
+    synchronized (clients) {
+      for (IvyClient ic :  clients.values() ) {
+	if ( (ic == null)||((icname = ic.getApplicationName()) == null) ) break;
+	if (icname.compareTo(name) == 0) v.addElement(ic);
+      }
     }
     return v;
   }
@@ -842,7 +863,9 @@ public class Ivy implements Runnable {
 
   protected synchronized void removeClient(IvyClient c) {
     synchronized(lock) {
-      clients.remove(c.getClientKey());
+      synchronized (clients) {
+	clients.remove(c.getClientKey());
+      }
       traceDebug("removed " + c + " from clients: " + getClientNames(clients));
     }
   }
@@ -854,7 +877,9 @@ public class Ivy implements Runnable {
       // TODO check if it's not already here !
       IvyClient peer = searchPeer(c);
       if ((peer == null) || peer.distanceTo(c)>0 ){
-	clients.put(c.getClientKey() , c);
+	synchronized (clients) {
+	  clients.put(c.getClientKey() , c);
+	}
 	setStarting(false);
 	traceDebug("added " + c + " in clients: " + getClientNames(clients));
       } else {
@@ -869,15 +894,19 @@ public class Ivy implements Runnable {
   }
 
   protected synchronized void addHalf(IvyClient c) {
-    synchronized(lock){ half.put(c.getClientKey() , c); }
+    //synchronized(lock){ 
+      synchronized (half) { half.put(c.getClientKey() , c); }
+    //}
     traceDebug("added " + c + " in half: " + getClientNames(half));
   }
 
   protected synchronized void removeHalf(IvyClient c) {
-    synchronized(lock) { 
+    //synchronized(lock) { 
       if (half == null||c == null) return;
-      half.remove(c.getClientKey());
-    }
+      synchronized (half) {
+	half.remove(c.getClientKey());
+      }
+    //}
     traceDebug("removed " + c + " from half: " + getClientNames(half));
   }
 
@@ -894,13 +923,11 @@ public class Ivy implements Runnable {
   */
 
   private synchronized IvyClient searchPeer(IvyClient ic) {
-    synchronized(lock) {
-      //for (Enumeration<IvyClient> e = half.elements(); e.hasMoreElements(); ) {
-//	peer = e.nextElement();
-//	if ((peer != null)&&(peer.equals(ic))) return peer;
- //     }
-      for (IvyClient peer : clients.values()) if ((peer != null)&&(peer.equals(ic))) return peer;
-    }
+    //synchronized(lock) {
+      synchronized (clients) {
+	for (IvyClient peer : clients.values()) if ((peer != null)&&(peer.equals(ic))) return peer;
+      }
+    //}
     return null;
   }
 
@@ -970,10 +997,12 @@ public class Ivy implements Runnable {
   }
 
   // a small private method for debbugging purposes
-  private String getClientNames(Hashtable<Integer , IvyClient> t) {
+  private String getClientNames(Map<Integer , IvyClient> t) {
     StringBuffer s = new StringBuffer();
     s.append("(");
-    for (IvyClient ic : t.values() ) if (ic != null) s.append(ic.getApplicationName() + ",");
+    synchronized (t) {
+      for (IvyClient ic : t.values() ) if (ic != null) s.append(ic.getApplicationName() + ",");
+    }
     s.append(")");
     return s.toString();
   }
diff --git a/src/IvyClient.java b/src/IvyClient.java
index 8ed25f7..17ce224 100755
--- a/src/IvyClient.java
+++ b/src/IvyClient.java
@@ -10,6 +10,8 @@
  * created for each remote client.
  *
  *  CHANGELOG:
+ *  1.2.16
+ *    - now uses the synchronized wrappers of the Java API for all collections
  *  1.2.14
  *  - use autoboxing for the creation of Integer (instead of
  *  new Integer(int). This alows caching, avoids object allocation, and the
@@ -89,8 +91,12 @@ package fr.dgac.ivy ;
 import java.lang.Thread;
 import java.net.*;
 import java.io.*;
-import java.util.*;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.Collections;
+import java.util.Vector;
 import java.util.regex.*;
+import java.util.Collection;
 
 public class IvyClient extends Thread {
     
@@ -119,7 +125,8 @@ public class IvyClient extends Thread {
   private static int pingSerial = 0;
   private static final Object lock = new Object();
   private static int clientSerial=0;	/* an unique ID for each IvyClient */
-  private Hashtable <Integer,PingCallbackHolder>PingCallbacksTable = new Hashtable<Integer,PingCallbackHolder>();
+  private Map <Integer,PingCallbackHolder>PingCallbacksTable =
+    Collections.synchronizedMap(new HashMap<Integer,PingCallbackHolder>());
   
   private Ivy bus;
   private Socket socket;
@@ -133,8 +140,8 @@ public class IvyClient extends Thread {
 
   // protected variables
   String appName="none";
-  Hashtable <Integer,Pattern>regexps = new Hashtable<Integer,Pattern>();
-  Hashtable <Integer,String>regexpsText = new Hashtable<Integer,String>();
+  Map <Integer,Pattern>regexps = Collections.synchronizedMap(new HashMap<Integer,Pattern>());
+  Map <Integer,String>regexpsText = Collections.synchronizedMap(new HashMap<Integer,String>());
   static boolean debug = (System.getProperty("IVY_DEBUG")!=null) ;
   // int protocol;
   private boolean incoming;
@@ -175,7 +182,7 @@ public class IvyClient extends Thread {
   // initiate the connexion
   private void sendSchizo() throws IOException {
     traceDebug("sending our service port "+bus.getAppPort());
-    Hashtable<Integer,String> tosend=bus.getSelfIvyClient().regexpsText;
+    Map<Integer,String> tosend=bus.getSelfIvyClient().regexpsText;
     sendString(SchizoToken,bus.getAppPort(),bus.getAppName());
     for (Integer ikey : tosend.keySet()) sendRegexp(ikey.intValue(),tosend.get(ikey));
     sendString( EndRegexp,0,"");
@@ -207,7 +214,7 @@ public class IvyClient extends Thread {
    *  The content is not modifyable because String are not mutable, and cannot
    *  be modified once they are create.
    */
-  public Enumeration<String> getRegexps() { return regexpsText.elements(); }
+  public Collection<String> getRegexps() { return regexpsText.values(); }
 
   /**
    *  allow an Ivy package class to access the list of regexps at a
@@ -217,8 +224,7 @@ public class IvyClient extends Thread {
   public String[] getRegexpsArray() {
     String[] s = new String[regexpsText.size()];
     int i=0;
-    for (Enumeration<String>e=getRegexps();e.hasMoreElements();)
-      s[i++]=e.nextElement();
+    for (String sr : getRegexps()) s[i++]=sr;
     return s;
   }
 
@@ -628,24 +634,28 @@ public class IvyClient extends Thread {
   }
 
   void PCHadd(int serial,PingCallback pc) {
-    PingCallbacksTable.put(serial,new PingCallbackHolder(pc));
-    if (PingCallbacksTable.size()>MAXPONGCALLBACKS) {
-      // more than MAXPONGCALLBACKS callbacks, we ought to limit to prevent a
-      // memory leak
-      // TODO remove the first
-      Integer smallest=(Integer)new TreeSet<Integer>(PingCallbacksTable.keySet()).first();
-      PingCallbackHolder pch = (PingCallbackHolder)PingCallbacksTable.remove(smallest);
-      System.err.println("no response from "+getApplicationName()+" to ping "+smallest+" after "+pch.age()+" ms, discarding");
+    synchronized (PingCallbacksTable) {
+      PingCallbacksTable.put(serial,new PingCallbackHolder(pc));
+      if (PingCallbacksTable.size()>MAXPONGCALLBACKS) {
+	// more than MAXPONGCALLBACKS callbacks, we ought to limit to prevent a
+	// memory leak
+	// TODO remove the first
+	Integer smallest=(Integer)new java.util.TreeSet<Integer>(PingCallbacksTable.keySet()).first();
+	PingCallbackHolder pch = (PingCallbackHolder)PingCallbacksTable.remove(smallest);
+	System.err.println("no response from "+getApplicationName()+" to ping "+smallest+" after "+pch.age()+" ms, discarding");
+      }
     }
   }
 
   void PCHget(Integer serial) {
-    PingCallbackHolder pc = (PingCallbackHolder)PingCallbacksTable.remove(serial);
-    if (pc==null) {
-      System.err.println("warning: pong received for a long lost callback");
-      return;
+    synchronized (PingCallbacksTable) {
+      PingCallbackHolder pc = (PingCallbackHolder)PingCallbacksTable.remove(serial);
+      if (pc==null) {
+	System.err.println("warning: pong received for a long lost callback");
+	return;
+      }
+      pc.run();
     }
-    pc.run();
   }
 
   private class PingCallbackHolder {
diff --git a/src/IvyWatcher.java b/src/IvyWatcher.java
index 1e33302..54eca11 100755
--- a/src/IvyWatcher.java
+++ b/src/IvyWatcher.java
@@ -14,6 +14,8 @@
  * thing.
  *
  * CHANGELOG:
+ *  1.2.16
+ *    - now uses the synchronized wrappers of the Java API for all collections
  *  1.2.15
  *    - allows the fine tuning of the IvyClient socket buffersize using
  *    IVY_BUFFERSIZE property
@@ -83,7 +85,9 @@ package fr.dgac.ivy ;
 import java.lang.Thread;
 import java.net.*;
 import java.io.*;
-import java.util.Hashtable;
+import java.util.Collections;
+import java.util.Map;
+import java.util.HashMap;
 import java.util.regex.*;
 
 class IvyWatcher extends Thread {
@@ -295,17 +299,17 @@ class IvyWatcher extends Thread {
    * checks if there is already a broadcast received from the same address
    * on the same port
    *
-   * regoes static ...
    */
-  //private static Hashtable alreadySocks=new Hashtable();
-  private Hashtable<String,Integer> alreadySocks=new Hashtable<String,Integer>();
-  private synchronized boolean alreadyBroadcasted(String s,int port) {
+  private Map<String,Integer> alreadySocks=Collections.synchronizedMap(new HashMap<String,Integer>());
+  private boolean alreadyBroadcasted(String s,int port) {
     // System.out.println("DEBUUUUUUUG " + s+ ":" + port);
     if (s==null) return false;
-    Integer i = alreadySocks.get(s);
-    if (((i!=null)&&(i.compareTo(port))==0)) return true;
-    alreadySocks.put(s,port);
-    return false;
+    synchronized (alreadySocks) {
+      Integer i = alreadySocks.get(s);
+      if (((i!=null)&&(i.compareTo(port))==0)) return true;
+      alreadySocks.put(s,port);
+      return false;
+    }
   }
 
   /*
diff --git a/src/Probe.java b/src/Probe.java
index 4425dd4..c8021c5 100644
--- a/src/Probe.java
+++ b/src/Probe.java
@@ -7,6 +7,8 @@
  * (c) CENA
  *
  * Changelog:
+ * 1.2.16
+ *    - now uses the synchronized wrappers of the Java API for all collections
  * 1.2.14
  *   - uses the "new" for: loop construct of Java5
  *   - throws RuntimeException instead of System.exit(), allows code reuse
@@ -247,9 +249,8 @@ public class Probe implements IvyApplicationListener, IvyMessageListener, IvyBin
       int total=0;
       int boundedtotal=0;
       for (IvyClient ic: v) {
-	for (Enumeration<String> e = ic.getRegexps();e.hasMoreElements();) {
+	for (String r : ic.getRegexps()) {
 	  total++;
-	  String r = e.nextElement();
 	  if (r.startsWith("^")) boundedtotal++;
 	  println(ic.getApplicationName()+" has subscribed to: "+r); 
 	}
@@ -262,19 +263,16 @@ public class Probe implements IvyApplicationListener, IvyMessageListener, IvyBin
       Vector<IvyClient>v=bus.getIvyClientsByName(target);
       if (v.size()==0) println("no Ivy client with  the name \""+target+"\"");
       for (IvyClient ic:v) {
-	for (Enumeration<String> e = ic.getRegexps();e.hasMoreElements();) {
+	for (String r : ic.getRegexps()) {
 	  total++;
-	  String r = e.nextElement();
 	  if (r.startsWith("^")) boundedtotal++;
-	  println(target+" has subscribed to: "+(String)e.nextElement());
+	  println(target+" has subscribed to: "+r);
 	}
 	System.out.println("total: "+total+", unbounded:"+(total-boundedtotal));
       }
     } else if (s.lastIndexOf(".bound")>=0){
       println("you have subscribed to:"); 
-      for (Enumeration<String> e = bus.getSelfIvyClient().getRegexps();e.hasMoreElements();) {
-	println("\t"+e.nextElement());
-      }
+      for (String re : bus.getSelfIvyClient().getRegexps()) println("\t"+re);
     } else if (s.lastIndexOf(".bind ")>=0){
       String regexp=s.substring(6);
       try {
@@ -348,8 +346,6 @@ public class Probe implements IvyApplicationListener, IvyMessageListener, IvyBin
 
   public void connect(IvyClient client) {
     println(client.getApplicationName() + " connected " );
-    // for (java.util.Enumeration e=client.getRegexps();e.hasMoreElements();)
-    //   println(client.getApplicationName() + " subscribes to " +e.nextElement() );
   }
 
   public void disconnect(IvyClient client) {
diff --git a/src/SelfIvyClient.java b/src/SelfIvyClient.java
index a87c859..3e9ba6a 100644
--- a/src/SelfIvyClient.java
+++ b/src/SelfIvyClient.java
@@ -6,6 +6,8 @@
  * @since 1.2.4
  *
  *  CHANGELOG:
+ *  1.2.16
+ *    - now uses the synchronized wrappers of the Java API for all collections
  *  1.2.14
  *    - uses autoboxing for Boolean
  *    - switch from gnu regexp (deprecated) to the built in java regexp
@@ -22,15 +24,19 @@
  */
 
 package fr.dgac.ivy ;
-import java.util.*;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.Collections;
 import java.util.regex.*;
 
 public class SelfIvyClient extends IvyClient {
     
   private Ivy bus;
   private static int serial=0;		/* an unique ID for each regexp */
-  private Hashtable<Integer,IvyMessageListener> callbacks=new Hashtable<Integer,IvyMessageListener>();
-  private Hashtable<Integer,BindType> threadedFlag=new Hashtable<Integer,BindType>();
+  private Map<Integer,IvyMessageListener> callbacks=
+    Collections.synchronizedMap(new HashMap<Integer,IvyMessageListener>());
+  private Map<Integer,BindType> threadedFlag=
+    Collections.synchronizedMap(new HashMap<Integer,BindType>());
 
   public void sendDirectMsg(int id,String message) {
     bus.directMessage(this,id,message);
@@ -43,42 +49,50 @@ public class SelfIvyClient extends IvyClient {
     this.appName=appName;
   }
 
-  synchronized protected int bindMsg(String sregexp, IvyMessageListener callback, BindType type ) throws IvyException  {
+  protected int bindMsg(String sregexp, IvyMessageListener callback, BindType type ) throws IvyException  {
     // creates a new binding (regexp,callback)
     try {
       Pattern re=Pattern.compile(sregexp,Pattern.DOTALL);
       Integer key = serial++;
       regexps.put(key,re);
       regexpsText.put(key,sregexp);
-      callbacks.put(key,callback);
-      threadedFlag.put(key,type); // use autoboxing of boolean
+      synchronized (callbacks) {
+	callbacks.put(key,callback);
+      }
+      synchronized (threadedFlag) {
+	threadedFlag.put(key,type); // use autoboxing of boolean
+      }
       return key.intValue();
     } catch (PatternSyntaxException ree) {
       throw new IvyException("Invalid regexp " + sregexp);
     }
   }
 
-  synchronized protected void unBindMsg(int id) throws IvyException {
+  protected synchronized void unBindMsg(int id) throws IvyException {
     Integer key = id;
-    if ( ( regexps.remove(key) == null )
-         || (regexpsText.remove(key) == null )
-         || (callbacks.remove(key) == null )
-         || (threadedFlag.remove(key) == null )
-       )
-    throw new IvyException("client wants to remove an unexistant regexp "+id);
+    synchronized (regexps) { synchronized (callbacks) { synchronized (threadedFlag) {
+      if ( ( regexps.remove(key) == null )
+	  || (regexpsText.remove(key) == null )
+	  || (callbacks.remove(key) == null )
+	  || (threadedFlag.remove(key) == null )
+	 )
+	throw new IvyException("client wants to remove an unexistant regexp "+id);
+    } } }
   }
 
   // unbinds to the first regexp
-  synchronized protected boolean unBindMsg(String re) {
-    if (!regexpsText.contains(re)) return false;
-    for (Integer k :  regexpsText.keySet()) {
-      if ( (regexpsText.get(k)).compareTo(re) == 0) {
-	try {
-	  bus.unBindMsg(k.intValue());
-	} catch (IvyException ie) {
-	  return false;
+  protected synchronized boolean unBindMsg(String re) {
+    synchronized (regexpsText) {
+      if (regexpsText.get(re) == null) return false;
+      for (Integer k :  regexpsText.keySet()) {
+	if ( (regexpsText.get(k)).compareTo(re) == 0) {
+	  try {
+	    bus.unBindMsg(k.intValue());
+	  } catch (IvyException ie) {
+	    return false;
+	  }
+	  return true;
 	}
-	return true;
       }
     }
     return false;
@@ -106,7 +120,10 @@ public class SelfIvyClient extends IvyClient {
   }
 
   protected void callCallback(IvyClient client, Integer key, String[] tab) {
-    IvyMessageListener callback=callbacks.get(key);
+    IvyMessageListener callback;
+    synchronized (callbacks) {
+      callback=callbacks.get(key);
+    }
     if (callback==null) {
       traceDebug("Not regexp matching id "+key.intValue()+", it must have been unsubscribed concurrently");
       return; 
diff --git a/src/WaiterClient.java b/src/WaiterClient.java
index 33196f2..70c3f81 100644
--- a/src/WaiterClient.java
+++ b/src/WaiterClient.java
@@ -8,7 +8,7 @@
  */
 
 package fr.dgac.ivy ;
-import java.util.Hashtable;
+import java.util.Map;
 
 class WaiterClient extends IvyApplicationAdapter implements Runnable {
     private static final int INCREMENT = 100;
@@ -17,9 +17,9 @@ class WaiterClient extends IvyApplicationAdapter implements Runnable {
     private boolean forever=false;
     private Thread t;
     String name;
-    private Hashtable <Integer,IvyClient>clients ;
+    private Map <Integer,IvyClient>clients ;
 
-    WaiterClient(String n,int timeout,Hashtable <Integer,IvyClient>clients) {
+    WaiterClient(String n,int timeout,Map <Integer,IvyClient>clients) {
       this.timeout=timeout;
       this.clients=clients;
       name=n;