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Diffstat (limited to '')
-rw-r--r-- | sca-cpp/trunk/components/chat/chatter.cpp | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/sca-cpp/trunk/components/chat/chatter.cpp b/sca-cpp/trunk/components/chat/chatter.cpp new file mode 100644 index 0000000000..5a6d4909df --- /dev/null +++ b/sca-cpp/trunk/components/chat/chatter.cpp @@ -0,0 +1,162 @@ +/* + * 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 chatter component implementation. + */ + +#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 { + +/** + * 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>(reason(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; +}; + +/** + * Chatter component lambda function + */ +class chatter { +public: + chatter(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 chatter component + if (func != "stop") + return tuscany::mkfailure<tuscany::value>(); + debug("chat::chatter::stop"); + + // Disconnect and shutdown the worker thread + disconnect(const_cast<XMPPClient&>(xc)); + shutdown(const_cast<worker&>(w)); + debug("chat::chatter::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(list<value>)>)car(props))(list<value>()); + const value pass = ((lambda<value(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>(reason(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 chatter component lambda function + return value(lambda<value(const list<value>&)>(chatter(xc, w))); +} + +} +} + +extern "C" { + +const tuscany::value apply(const tuscany::list<tuscany::value>& params) { + const tuscany::value func(car(params)); + if (func == "start" || func == "restart") + return tuscany::chat::start(cdr(params)); + return tuscany::mkfailure<tuscany::value>(); +} + +} |