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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 "SemanticState.h"
#include "SessionHandler.h"
#include "SessionState.h"
#include "BrokerAdapter.h"
#include "MessageDelivery.h"
#include "Connection.h"
#include "qpid/framing/ExecutionCompleteBody.h"
#include "qpid/framing/ExecutionResultBody.h"
#include "qpid/framing/ServerInvoker.h"
#include "qpid/log/Statement.h"
#include <boost/format.hpp>
#include <boost/bind.hpp>
using namespace qpid::broker;
using namespace qpid::framing;
using namespace qpid::sys;
SemanticHandler::SemanticHandler(SessionState& s) :
state(*this,s), session(s),
ackOp(boost::bind(&SemanticState::ackRange, &state, _1, _2))
{}
void SemanticHandler::handle(framing::AMQFrame& frame)
{
//TODO: assembly for method and headers
//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. controls on the first track are
//used to communicate details about that 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?
TrackId track = getTrack(frame);//will be replaced by field in 0-10 frame header
switch(track) {
case EXECUTION_CONTROL_TRACK:
handleL3(frame.getMethod());
break;
case MODEL_COMMAND_TRACK:
handleCommand(frame.getMethod());
break;
case MODEL_CONTENT_TRACK:
handleContent(frame);
break;
}
}
void SemanticHandler::complete(uint32_t cumulative, const SequenceNumberSet& range)
{
//record:
SequenceNumber mark(cumulative);
if (outgoing.lwm < mark) {
outgoing.lwm = mark;
//ack messages:
state.ackCumulative(mark.getValue());
}
range.processRanges(ackOp);
}
void SemanticHandler::sendCompletion()
{
SequenceNumber mark = incoming.getMark();
SequenceNumberSet range = incoming.getRange();
Mutex::ScopedLock l(outLock);
session.getProxy().getExecution().complete(mark.getValue(), range);
}
void SemanticHandler::flush()
{
incoming.flush();
sendCompletion();
}
void SemanticHandler::sync()
{
incoming.sync();
sendCompletion();
}
void SemanticHandler::noop()
{
incoming.noop();
}
void SemanticHandler::result(uint32_t /*command*/, const std::string& /*data*/)
{
//never actually sent by client at present
}
void SemanticHandler::handleCommand(framing::AMQMethodBody* method)
{
SequenceNumber id = incoming.next();
BrokerAdapter adapter(state);
Invoker::Result invoker = invoke(adapter, *method);
incoming.complete(id);
if (!invoker.wasHandled()) {
throw NotImplementedException("Not implemented");
} else if (invoker.hasResult()) {
Mutex::ScopedLock l(outLock);
session.getProxy().getExecution().result(id.getValue(), invoker.getResult());
}
if (method->isSync()) {
incoming.sync(id);
sendCompletion();
}
//TODO: if window gets too large send unsolicited completion
}
void SemanticHandler::handleL3(framing::AMQMethodBody* method)
{
if (!invoke(*this, *method))
throw NotImplementedException("Not implemented");
}
void SemanticHandler::handleContent(AMQFrame& frame)
{
Message::shared_ptr msg(msgBuilder.getMessage());
if (!msg) {//start of frameset will be indicated by frame flags
msgBuilder.start(incoming.next());
msg = msgBuilder.getMessage();
}
msgBuilder.handle(frame);
if (msg->getFrames().isComplete()) {//end of frameset will be indicated by frame flags
msg->setPublisher(&session.getConnection());
state.handle(msg);
msgBuilder.end();
incoming.track(msg);
if (msg->getFrames().getMethod()->isSync()) {
incoming.sync(msg->getCommandId());
sendCompletion();
}
}
}
DeliveryId SemanticHandler::deliver(QueuedMessage& msg, DeliveryToken::shared_ptr token)
{
Mutex::ScopedLock l(outLock);
SessionHandler* handler = session.getHandler();
if (handler) {
uint32_t maxFrameSize = handler->getConnection().getFrameMax();
MessageDelivery::deliver(msg, handler->out, ++outgoing.hwm, token, maxFrameSize);
} else {
QPID_LOG(error, "Dropping message as session is no longer attached to a channel.");
}
return outgoing.hwm;
}
SemanticHandler::TrackId SemanticHandler::getTrack(const AMQFrame& frame)
{
//will be replaced by field in 0-10 frame header
uint8_t type = frame.getBody()->type();
uint16_t classId;
switch(type) {
case METHOD_BODY:
if (frame.castBody<AMQMethodBody>()->isContentBearing()) {
return MODEL_CONTENT_TRACK;
}
classId = frame.castBody<AMQMethodBody>()->amqpClassId();
switch (classId) {
case ExecutionCompleteBody::CLASS_ID:
return EXECUTION_CONTROL_TRACK;
}
return MODEL_COMMAND_TRACK;
case HEADER_BODY:
case CONTENT_BODY:
return MODEL_CONTENT_TRACK;
}
throw Exception("Could not determine track");
}
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