cpp/lib/client/Connection.cpp

/*
 *
 * 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.
 *
 */
#include <algorithm>
#include <boost/format.hpp>
#include <boost/bind.hpp>

#include <Connection.h>
#include <ClientChannel.h>
#include <ClientMessage.h>
#include <QpidError.h>
#include <iostream>
#include <sstream>
#include <MethodBodyInstances.h>
#include <functional>

using namespace qpid::framing;
using namespace qpid::sys;


namespace qpid {
namespace client {

const std::string Connection::OK("OK");

Connection::Connection(
    bool _debug, uint32_t _max_frame_size,
    framing::ProtocolVersion _version
) : channelIdCounter(0), version(_version), max_frame_size(_max_frame_size),
    defaultConnector(version, _debug, _max_frame_size),
    isOpen(false), debug(_debug)
{
    setConnector(defaultConnector);
}

Connection::~Connection(){}

void Connection::setConnector(Connector& con)
{
    connector = &con;
    connector->setInputHandler(this);
    connector->setTimeoutHandler(this);
    connector->setShutdownHandler(this);
    out = connector->getOutputHandler();
}

void Connection::open(
    const std::string& host, int port,
    const std::string& uid, const std::string& pwd, const std::string& vhost)
{
    if (isOpen)
        THROW_QPID_ERROR(INTERNAL_ERROR, "Channel object is already open");
    connector->connect(host, port);
    channels[0] = &channel0;
    channel0.open(0, *this);
    channel0.protocolInit(uid, pwd, vhost);
    isOpen = true;
}

void Connection::shutdown() {
    close();
}
        
void Connection::close(
    ReplyCode code, const string& msg, ClassId classId, MethodId methodId
)
{
    if(isOpen) {
        // TODO aconway 2007-01-29: Exception handling - could end up
        // partly closed with threads left unjoined.
        isOpen = false;
        channel0.sendAndReceive<ConnectionCloseOkBody>(
            new ConnectionCloseBody(
                getVersion(), code, msg, classId, methodId));

        using boost::bind;
        for_each(channels.begin(), channels.end(),
                 bind(&Channel::closeInternal,
                             bind(&ChannelMap::value_type::second, _1)));
        channels.clear();
        connector->close();
    }
}

void Connection::openChannel(Channel& channel) {
    ChannelId id = ++channelIdCounter;
    assert (channels.find(id) == channels.end());
    assert(out);
    channels[id] = &channel;
    channel.open(id, *this);
}

void Connection::erase(ChannelId id) {
    channels.erase(id);
}

void Connection::received(AMQFrame* frame){
    // FIXME aconway 2007-01-25: Mutex 
    ChannelId id = frame->getChannel();
    Channel* channel = channels[id];
    // FIXME aconway 2007-01-26: Exception thrown here is hanging the
    // client. Need to review use of exceptions.
    if (channel == 0)
        THROW_QPID_ERROR(
            PROTOCOL_ERROR+504,
            (boost::format("Invalid channel number %g") % id).str());
    try{
        channel->handleBody(frame->getBody());
    }catch(const qpid::QpidError& e){
        channelException(
            *channel, dynamic_cast<AMQMethodBody*>(frame->getBody().get()), e);
    }
}

void Connection::send(AMQFrame* frame) {
    out->send(frame);
}

void Connection::channelException(
    Channel& channel, AMQMethodBody* method, const QpidError& e)
{
    int code = (e.code >= PROTOCOL_ERROR) ? e.code - PROTOCOL_ERROR : 500;
    string msg = e.msg;
    if(method == 0)
        channel.close(code, msg);
    else
        channel.close(
            code, msg, method->amqpClassId(), method->amqpMethodId());
}

void Connection::idleIn(){
    connector->close();
}

void Connection::idleOut(){
    out->send(new AMQFrame(version, 0, new AMQHeartbeatBody()));
}

}} // namespace qpid::client