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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 "Cluster.h"
#include "Cpg.h"
#include "qpid/framing/AMQFrame.h"
#include "qpid/framing/ClusterNotifyBody.h"
#include "qpid/log/Statement.h"
#include <boost/bind.hpp>
#include <algorithm>
#include <iterator>
namespace qpid {
namespace cluster {
using namespace qpid::framing;
using namespace qpid::sys;
using namespace std;
ostream& operator <<(ostream& out, const Cluster& cluster) {
return out << cluster.name.str() << "(" << cluster.self << ")";
}
void Cluster::notify() {
// TODO aconway 2007-06-25: Use proxy here.
AMQFrame frame(version, 0,
make_shared_ptr(new ClusterNotifyBody(version, url)));
handle(frame);
}
Cluster::Cluster(
const std::string& name_, const std::string& url_, FrameHandler& next_,
ProtocolVersion ver)
: name(name_), url(url_), version(ver),
cpg(new Cpg(boost::bind(&Cluster::cpgDeliver, this, _1, _2, _3, _4, _5, _6),
boost::bind(&Cluster::cpgConfigChange, this, _1, _2, _3, _4, _5, _6, _7, _8))),
next(next_)
{
self=Id(cpg->getLocalNoideId(), getpid());
QPID_LOG(trace, *this << " Joining cluster.");
cpg->join(name);
notify();
dispatcher=Thread(*this);
}
Cluster::~Cluster() {
try {
QPID_LOG(trace, *this << " Leaving cluster.");
cpg->leave(name);
cpg.reset();
dispatcher.join();
} catch (const std::exception& e) {
QPID_LOG(error, "Exception leaving cluster " << e.what());
}
}
void Cluster::handle(AMQFrame& frame) {
QPID_LOG(trace, *this << " SEND: " << frame);
Buffer buf(frame.size());
frame.encode(buf);
buf.flip();
iovec iov = { buf.start(), frame.size() };
cpg->mcast(name, &iov, 1);
}
size_t Cluster::size() const {
Mutex::ScopedLock l(lock);
return members.size();
}
Cluster::MemberList Cluster::getMembers() const {
Mutex::ScopedLock l(lock);
MemberList result(members.size());
std::transform(members.begin(), members.end(), result.begin(),
boost::bind(&MemberMap::value_type::second, _1));
return result;
}
void Cluster::cpgDeliver(
cpg_handle_t /*handle*/,
struct cpg_name* /* group */,
uint32_t nodeid,
uint32_t pid,
void* msg,
int msg_len)
{
Id from(nodeid, pid);
Buffer buf(static_cast<char*>(msg), msg_len);
AMQFrame frame;
frame.decode(buf);
QPID_LOG(trace, *this << " RECV: " << frame);
// TODO aconway 2007-06-20: use visitor pattern.
ClusterNotifyBody* notifyIn= dynamic_cast<ClusterNotifyBody*>(frame.getBody().get());
if (notifyIn) {
Mutex::ScopedLock l(lock);
members[from].reset(new Member(notifyIn->getUrl()));
lock.notifyAll();
}
else
next.handle(frame);
}
void Cluster::cpgConfigChange(
cpg_handle_t /*handle*/,
struct cpg_name */*group*/,
struct cpg_address *ccMembers, int nMembers,
struct cpg_address *left, int nLeft,
struct cpg_address *joined, int nJoined
)
{
QPID_LOG(
trace,
*this << " Configuration change. " << endl
<< " Joined: " << make_pair(joined, nJoined) << endl
<< " Left: " << make_pair(left, nLeft) << endl
<< " Current: " << make_pair(ccMembers, nMembers));
{
Mutex::ScopedLock l(lock);
// Erase members that left.
for (int i = 0; i < nLeft; ++i)
members.erase(Id(left[i]));
lock.notifyAll();
}
// If there are new members (other than myself) then notify.
for (int i=0; i< nJoined; ++i) {
if (Id(joined[i]) != self) {
notify();
break;
}
}
// Note: New members are be added to my map when cpgDeliver
// gets a cluster.notify frame.
}
void Cluster::run() {
cpg->dispatchBlocking();
}
}} // namespace qpid::cluster
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