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/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed 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 "Channel.h"
#include "QpidError.h"
#include <iostream>
#include <sstream>
#include <assert.h>
using namespace qpid::broker;
using namespace qpid::framing;
using namespace qpid::concurrent;
Channel::Channel(OutputHandler* _out, int _id, u_int32_t _framesize) : out(_out),
id(_id),
framesize(_framesize),
transactional(false),
deliveryTag(1),
tagGenerator("sgen"){}
Channel::~Channel(){
for(consumer_iterator i = consumers.begin(); i != consumers.end(); i = consumers.begin() ){
std::cout << "ERROR: Channel consumer appears not to have been cancelled before channel was destroyed." << std::endl;
delete (i->second);
}
}
bool Channel::exists(string& consumerTag){
return consumers.find(consumerTag) != consumers.end();
}
void Channel::consume(string& tag, Queue::shared_ptr queue, bool acks, bool exclusive, ConnectionToken* const connection){
if(tag.empty()) tag = tagGenerator.generate();
ConsumerImpl* c(new ConsumerImpl(this, tag, queue, connection, acks));
try{
queue->consume(c, exclusive);//may throw exception
consumers[tag] = c;
}catch(ExclusiveAccessException& e){
delete c;
throw e;
}
}
void Channel::cancel(string& tag){
consumer_iterator i = consumers.find(tag);
if(i != consumers.end()){
ConsumerImpl* c = i->second;
consumers.erase(i);
if(c){
c->cancel();
delete c;
}
}
}
void Channel::close(){
//cancel all consumers
for(consumer_iterator i = consumers.begin(); i != consumers.end(); i = consumers.begin() ){
ConsumerImpl* c = i->second;
consumers.erase(i);
if(c){
c->cancel();
delete c;
}
}
}
void Channel::begin(){
transactional = true;
}
void Channel::commit(){
}
void Channel::rollback(){
}
void Channel::deliver(Message::shared_ptr& msg, string& consumerTag, Queue::shared_ptr& queue, bool ackExpected){
Locker locker(deliveryLock);
u_int64_t myDeliveryTag = deliveryTag++;
if(ackExpected){
unacknowledged.push_back(AckRecord(msg, queue, consumerTag, myDeliveryTag));
}
//send deliver method, header and content(s)
msg->deliver(out, id, consumerTag, myDeliveryTag, framesize);
}
Channel::ConsumerImpl::ConsumerImpl(Channel* _parent, string& _tag,
Queue::shared_ptr _queue,
ConnectionToken* const _connection, bool ack) : parent(_parent),
tag(_tag),
queue(_queue),
connection(_connection),
ackExpected(ack){
}
bool Channel::ConsumerImpl::deliver(Message::shared_ptr& msg){
if(connection != msg->getPublisher()){
parent->deliver(msg, tag, queue, ackExpected);
return true;
}else{
return false;
}
}
void Channel::ConsumerImpl::cancel(){
if(queue) queue->cancel(this);
}
void Channel::handlePublish(Message* msg){
if(message.get()){
THROW_QPID_ERROR(PROTOCOL_ERROR + 504, "Invalid message sequence: got publish before previous content was completed.");
}
message = Message::shared_ptr(msg);
}
void Channel::handleHeader(AMQHeaderBody::shared_ptr header, ExchangeRegistry* exchanges){
if(!message.get()){
THROW_QPID_ERROR(PROTOCOL_ERROR + 504, "Invalid message sequence: got header before publish.");
}
message->setHeader(header);
if(message->isComplete()){
publish(exchanges);
}
}
void Channel::handleContent(AMQContentBody::shared_ptr content, ExchangeRegistry* exchanges){
if(!message.get()){
THROW_QPID_ERROR(PROTOCOL_ERROR + 504, "Invalid message sequence: got content before publish.");
}
message->addContent(content);
if(message->isComplete()){
publish(exchanges);
}
}
void Channel::publish(ExchangeRegistry* exchanges){
if(!route(message, exchanges)){
std::cout << "WARNING: Could not route message." << std::endl;
}
message.reset();
}
void Channel::ack(u_int64_t deliveryTag, bool multiple){
ack_iterator i = find_if(unacknowledged.begin(), unacknowledged.end(), MatchAck(deliveryTag));
if(i == unacknowledged.end()){
//error: how should this be signalled?
}else if(multiple){
unacknowledged.erase(unacknowledged.begin(), ++i);
}else{
unacknowledged.erase(i);
}
}
void Channel::recover(bool requeue){
if(requeue){
for_each(unacknowledged.begin(), unacknowledged.end(), Requeue());
unacknowledged.clear();
}else{
for_each(unacknowledged.begin(), unacknowledged.end(), Redeliver(this));
}
}
Channel::MatchAck::MatchAck(u_int64_t _tag) : tag(_tag) {}
bool Channel::MatchAck::operator()(AckRecord& record) const{
return tag == record.deliveryTag;
}
void Channel::Requeue::operator()(AckRecord& record) const{
record.msg->redeliver();
record.queue->deliver(record.msg);
}
Channel::Redeliver::Redeliver(Channel* const _channel) : channel(_channel) {}
void Channel::Redeliver::operator()(AckRecord& record) const{
record.msg->deliver(channel->out, channel->id, record.consumerTag, record.deliveryTag, channel->framesize);
}
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