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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 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));
cancel(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")
return tuscany::chat::start(cdr(params));
return tuscany::mkfailure<tuscany::value>();
}
}
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