--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/dancres/blitz/remote/ConstrainableTxnParticipantProxy.java	Sat Mar 21 11:00:06 2009 +0000
@@ -0,0 +1,70 @@
+package org.dancres.blitz.remote;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.InvalidObjectException;
+
+import net.jini.id.Uuid;
+
+import net.jini.core.transaction.server.TransactionParticipant;
+
+import net.jini.core.constraint.RemoteMethodControl;
+import net.jini.core.constraint.MethodConstraints;
+
+import net.jini.security.proxytrust.ProxyTrustIterator;
+import net.jini.security.proxytrust.SingletonProxyTrustIterator;
+
+/**
+   When the remote stub generated by the exporter implements
+   RemoteMethodControl, Blitz exports this proxy for participant duties to
+   support appropriate constraints etc.
+ */
+public final class ConstrainableTxnParticipantProxy extends
+    TxnParticipantProxy implements RemoteMethodControl {
+
+    private static TransactionParticipant constrainStub(TransactionParticipant aServer, MethodConstraints aConstraints) {
+        RemoteMethodControl myServer = (RemoteMethodControl) aServer;
+
+        myServer.setConstraints(aConstraints);
+        return (TransactionParticipant) myServer;
+    }
+
+    private final MethodConstraints theConstraints;
+
+    ConstrainableTxnParticipantProxy(TransactionParticipant aPart,
+                                     Uuid aUuid) {
+        super(aPart, aUuid);
+        theConstraints = null;
+    }
+
+    private ConstrainableTxnParticipantProxy(TransactionParticipant aPart,
+                                             Uuid aUuid,
+                                             MethodConstraints aConstraints) {
+        super(constrainStub(aPart, aConstraints), aUuid);
+        theConstraints = aConstraints;
+    }
+
+    private ProxyTrustIterator getProxyTrustIterator() {
+        return new SingletonProxyTrustIterator(theStub);
+    }
+
+    public RemoteMethodControl setConstraints(MethodConstraints aConstraints) {
+        return new ConstrainableTxnParticipantProxy(theStub, theUuid,
+                                                    aConstraints);
+        
+    }
+
+    public MethodConstraints getConstraints() {
+        return theConstraints;
+    }
+
+    private void readObject(ObjectInputStream anOIS)
+        throws IOException, ClassNotFoundException {
+
+        anOIS.defaultReadObject();
+
+        if(! (theStub instanceof RemoteMethodControl) ) {
+            throw new InvalidObjectException("space does not implement RemoteMethodControl");
+        }
+    }
+}