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diff --git a/sca-cpp/branches/lightweight-sca/components/chat/chat-sendreceiver.cpp b/sca-cpp/branches/lightweight-sca/components/chat/chat-sendreceiver.cpp
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/* $Rev$ $Date$ */
+
+/**
+ * XMPP chat sender/receiver component implementation.
+ */
+
+#define WANT_HTTPD_LOG 1
+#include "string.hpp"
+#include "function.hpp"
+#include "list.hpp"
+#include "value.hpp"
+#include "monad.hpp"
+#include "parallel.hpp"
+#include "xmpp.hpp"
+
+namespace tuscany {
+namespace chat {
+namespace sendreceiver {
+
+/**
+ * Post an item to an XMPP JID.
+ */
+const failable<value> post(const list<value>& params, XMPPClient& xc) {
+    const value to = car<value>(car(params));
+    const value val = cadr(params);
+    debug(to, "chat::post::jid");
+    debug(val, "chat::post::value");
+    const failable<bool> r = post(to, val, xc);
+    if (!hasContent(r))
+        return mkfailure<value>(r);
+    return value(mklist<value>(to));
+}
+
+/**
+ * A relay function that posts the XMPP messages it receives to a relay component reference.
+ */
+class relay {
+public:
+    relay(const lambda<value(const list<value>&)>& rel) : rel(rel) {
+    }
+
+    const failable<bool> operator()(const value& jid, const value& val, unused XMPPClient& xc) const {
+        if (isNil(rel))
+            return true;
+        debug(jid, "chat::relay::jid");
+        debug(val, "chat::relay::value");
+        const value res = rel(mklist<value>("post", mklist<value>(jid), val));
+        return true;
+    }
+
+private:
+    const lambda<value(const list<value>&)> rel;
+};
+
+/**
+ * Subscribe and listen to an XMPP session.
+ */
+class subscribe {
+public:
+    subscribe(const lambda<failable<bool>(const value&, const value&, XMPPClient&)>& l, XMPPClient& xc) : l(l), xc(xc) {
+    }
+
+    const failable<bool> operator()() const {
+        gc_pool pool;
+        debug("chat::subscribe::listen");
+        const failable<bool> r = listen(l, const_cast<XMPPClient&>(xc));
+        debug("chat::subscribe::stopped");
+        return r;
+    }
+
+private:
+    const lambda<failable<bool>(const value&, const value&, XMPPClient&)> l;
+    XMPPClient xc;
+};
+
+/**
+ * Chat sender/receiver component lambda function
+ */
+class chatSenderReceiver {
+public:
+    chatSenderReceiver(XMPPClient& xc, worker& w) : xc(xc), w(w) {
+    }
+
+    const value operator()(const list<value>& params) const {
+        const tuscany::value func(car(params));
+        if (func == "post")
+            return post(cdr(params), const_cast<XMPPClient&>(xc));
+
+        // Stop the chat sender/receiver component
+        if (func != "stop")
+            return mkfailure<value>();
+        debug("chat::sendreceiver::stop");
+
+        // Disconnect and shutdown the worker thread
+        disconnect(const_cast<XMPPClient&>(xc));
+        cancel(const_cast<worker&>(w));
+        debug("chat::sendreceiver::stopped");
+
+        return failable<value>(value(lambda<value(const list<value>&)>()));
+    }
+
+private:
+    const XMPPClient xc;
+    worker w;
+};
+
+/**
+ * Start the component.
+ */
+const failable<value> start(const list<value>& params) {
+    // Extract the relay reference and the XMPP JID and password
+    const bool hasRelay = !isNil(cddr(params));
+    const value rel = hasRelay? car(params) : value(lambda<value(const list<value>&)>());
+    const list<value> props = hasRelay? cdr(params) : params;
+    const value jid = ((lambda<value(const list<value>&)>)car(props))(list<value>());
+    const value pass = ((lambda<value(const list<value>&)>)cadr(props))(list<value>());
+
+    // Create an XMPP client session
+    XMPPClient xc(jid, pass, false);
+    const failable<bool> r = connect(xc);
+    if (!hasContent(r))
+        return mkfailure<value>(r);
+
+    // Listen and relay messages in a worker thread
+    worker w(3);
+    const lambda<failable<bool>(const value&, const value&, XMPPClient&)> rl = relay(rel);
+    submit<failable<bool> >(w, lambda<failable<bool>()>(subscribe(rl, xc)));
+
+    // Return the chat sender/receiver component lambda function
+    return value(lambda<value(const list<value>&)>(chatSenderReceiver(xc, w)));
+}
+
+}
+}
+}
+
+extern "C" {
+
+const tuscany::value apply(const tuscany::list<tuscany::value>& params) {
+    const tuscany::value func(car(params));
+    if (func == "start")
+        return tuscany::chat::sendreceiver::start(cdr(params));
+    return tuscany::mkfailure<tuscany::value>();
+}
+
+}