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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 "qpid/log/Statement.h"
#include "qpid/framing/amqp_types.h"
#include "qpid/framing/AMQFrame.h"
#include "ChannelManager.h"
namespace qpid {
namespace cluster {
using namespace framing;
/** Handler to multicast to the cluster */
struct ClusterHandler : public FrameHandler {
ClusterHandler(FrameHandler::Chain next, ChannelId bitmask_)
: FrameHandler(next), bitmask(bitmask_) {}
void handle(AMQFrame& frame) {
frame.channel |= bitmask; // Mark the frame
nextHandler(frame);
// TODO aconway 2007-06-28: Right now everything is backed up
// via multicast. When we have point-to-point backups this
// function must determine where each frame should be sent: to
// multicast or only to specific backup(s) via AMQP.
}
ChannelId bitmask;
};
ChannelManager::ChannelManager(FrameHandler::Chain mcast) : mcastOut(mcast){}
void ChannelManager::update(ChannelId id, FrameHandler::Chains& chains) {
// Store the original cluster chains for the channel.
channels[id] = chains;
// Replace chains with multicast-to-cluster handlers that mark the
// high-bit of the channel ID on outgoing frames so we can tell
// them from incoming frames in handle()
//
// When handle() receives the frames from the cluster it
// will forward them to the original channel chains stored in
// channels map.
//
chains.in = make_shared_ptr(new ClusterHandler(mcastOut, 0));
chains.out= make_shared_ptr(new ClusterHandler(mcastOut, CHANNEL_HIGH_BIT));
}
void ChannelManager::handle(AMQFrame& frame) {
bool isOut = frame.channel | CHANNEL_HIGH_BIT;
frame.channel |= ~CHANNEL_HIGH_BIT; // Clear the bit.
ChannelMap::iterator i = channels.find(frame.getChannel());
if (i != channels.end()) {
Chain& chain = isOut ? i->second.out : i->second.in;
chain->handle(frame);
}
else
updateFailoverState(frame);
}
void ChannelManager::updateFailoverState(AMQFrame& ) {
QPID_LOG(critical, "Failover is not implemented");
// FIXME aconway 2007-06-28:
// If the channel is not in my map then I'm not primary so
// I don't pass the frame to the channel handler but I
// do need to update the session failover state.
}
}} // namespace qpid::cluster
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