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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.
*
*/
#include "SemanticHandler.h"
#include "BrokerAdapter.h"
#include "qpid/framing/ChannelAdapter.h"
#include "qpid/framing/ChannelCloseOkBody.h"
#include "qpid/framing/ExecutionCompleteBody.h"
#include "qpid/framing/ExecutionResultBody.h"
#include "qpid/framing/InvocationVisitor.h"
using namespace qpid::broker;
using namespace qpid::framing;
using namespace qpid::sys;
SemanticHandler::SemanticHandler(ChannelId id, Connection& c) :
connection(c),
channel(c, *this, id, &c.broker.getStore())
{
init(id, connection.getOutput(), connection.getVersion());
adapter = std::auto_ptr<BrokerAdapter>(new BrokerAdapter(channel, connection, connection.broker, *this));
}
void SemanticHandler::handle(framing::AMQFrame& frame)
{
//TODO: assembly etc when move to 0-10 framing
//
//have potentially three separate tracks at this point:
//
// (1) execution controls
// (2) commands
// (3) data i.e. content-bearing commands
//
//framesets on each can be interleaved. framesets on the latter
//two share a command-id sequence.
//
//need to decide what to do if a frame on the command track
//arrives while a frameset on the data track is still
//open. execute it (i.e. out-of order execution with respect to
//the command id sequence) or queue it up.
//if ready to execute (i.e. if segment is complete or frame is
//message content):
handleBody(frame.getBody());
}
//ChannelAdapter virtual methods:
void SemanticHandler::handleMethod(framing::AMQMethodBody* method)
{
try {
if (!method->invoke(this)) {
//temporary hack until channel management is moved to its own handler:
if (method->amqpClassId() != ChannelOpenBody::CLASS_ID) {
++(incoming.lwm);
}
//else do the usual:
handleL4(method);
//(if the frameset is complete) we can move the execution-mark
//forward
//temporary hack until channel management is moved to its own handler:
if (method->amqpClassId() != ChannelOpenBody::CLASS_ID) {
//TODO: need to account for async store opreations
//when this command is a message publication
++(incoming.hwm);
}
//note: need to be more sophisticated than this if we execute
//commands that arrive within an active message frameset (that
//can't happen until 0-10 framing is implemented)
}
}catch(const std::exception& e){
connection.close(541/*internal error*/, e.what(), method->amqpClassId(), method->amqpMethodId());
}
}
void SemanticHandler::complete(uint32_t cumulative, const SequenceNumberSet& range)
{
//record:
SequenceNumber mark(cumulative);
if (outgoing.lwm < mark) {
outgoing.lwm = mark;
//ack messages:
channel.ackCumulative(mark.getValue());
//std::cout << "[" << this << "] acknowledged: " << mark << std::endl;
}
if (range.size() % 2) { //must be even number
throw ConnectionException(530, "Received odd number of elements in ranged mark");
} else {
for (SequenceNumberSet::const_iterator i = range.begin(); i != range.end(); i++) {
channel.ackRange((uint64_t) i->getValue(), (uint64_t) (++i)->getValue());
}
}
}
void SemanticHandler::flush()
{
//flush doubles as a sync to begin with - send an execution.complete
incoming.lwm = incoming.hwm;
if (isOpen()) {
Mutex::ScopedLock l(outLock);
ChannelAdapter::send(ExecutionCompleteBody(getVersion(), incoming.hwm.getValue(), SequenceNumberSet()));
}
}
void SemanticHandler::sync()
{
//for now, just treat as flush; will need to get more clever when we deal with async publication
flush();
}
void SemanticHandler::noop()
{
//Do nothing...
//
//is this an L3 control? or is it an L4 command?
//if the former, of what use is it?
//if the latter it may contain a synch request... but its odd to have it in this class
}
void SemanticHandler::result(uint32_t /*command*/, const std::string& /*data*/)
{
//never actually sent by client at present
}
void SemanticHandler::handleL4(framing::AMQMethodBody* method)
{
try{
if(getId() != 0 && !method->isA<ChannelOpenBody>() && !isOpen()) {
if (!method->isA<ChannelCloseOkBody>()) {
std::stringstream out;
out << "Attempt to use unopened channel: " << getId();
throw ConnectionException(504, out.str());
}
} else {
InvocationVisitor v(adapter.get());
method->accept(v);
if (!v.wasHandled()) {
throw ConnectionException(540, "Not implemented");
} else if (v.hasResult()) {
ChannelAdapter::send(ExecutionResultBody(getVersion(), incoming.lwm.getValue(), v.getResult()));
}
}
}catch(const ChannelException& e){
adapter->getProxy().getChannel().close(
e.code, e.toString(),
method->amqpClassId(), method->amqpMethodId());
connection.closeChannel(getId());
}catch(const ConnectionException& e){
connection.close(e.code, e.toString(), method->amqpClassId(), method->amqpMethodId());
}
}
bool SemanticHandler::isOpen() const
{
return channel.isOpen();
}
void SemanticHandler::handleHeader(qpid::framing::AMQHeaderBody* body)
{
channel.handleHeader(body);
}
void SemanticHandler::handleContent(qpid::framing::AMQContentBody* body)
{
channel.handleContent(body);
}
void SemanticHandler::handleHeartbeat(qpid::framing::AMQHeartbeatBody* body)
{
channel.handleHeartbeat(body);
}
DeliveryId SemanticHandler::deliver(Message::shared_ptr& msg, DeliveryToken::shared_ptr token)
{
Mutex::ScopedLock l(outLock);
SequenceNumber copy(outgoing.hwm);
++copy;
msg->deliver(*this, copy.getValue(), token, connection.getFrameMax());
//std::cout << "[" << this << "] delivered: " << outgoing.hwm.getValue() << std::endl;
return outgoing.hwm.getValue();
}
void SemanticHandler::redeliver(Message::shared_ptr& msg, DeliveryToken::shared_ptr token, DeliveryId tag)
{
msg->deliver(*this, tag, token, connection.getFrameMax());
}
void SemanticHandler::send(const AMQBody& body)
{
Mutex::ScopedLock l(outLock);
if (body.getMethod() && body.getMethod()->amqpClassId() != ChannelOpenBody::CLASS_ID) {
//temporary hack until channel management is moved to its own handler:
++outgoing.hwm;
}
ChannelAdapter::send(body);
}
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