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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 "qpid/framing/AMQFrame.h"
#include "qpid/framing/ClusterNotifyBody.h"
#include "qpid/log/Statement.h"
#include <boost/bind.hpp>
#include <algorithm>
#include <iterator>
#include <map>
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[" << cluster.name.str() << " " << cluster.self << "]";
}
ostream& operator<<(ostream& out, const Cluster::MemberMap::value_type& m) {
return out << m.first << "=" << m.second.url;
}
ostream& operator <<(ostream& out, const Cluster::MemberMap& members) {
ostream_iterator<Cluster::MemberMap::value_type> o(out, " ");
copy(members.begin(), members.end(), o);
return out;
}
Cluster::Cluster(const std::string& name_, const std::string& url_, broker::Broker& broker) :
FrameHandler(&sessions),
cpg(*this),
name(name_),
url(url_),
self(Id::self(cpg)),
sessions(broker, *this)
{
QPID_LOG(trace, *this << " Joining cluster: " << name_);
cpg.join(name);
notify();
dispatcher=Thread(*this);
// Wait till we show up in the cluster map.
{
Mutex::ScopedLock l(lock);
while (empty())
lock.wait();
}
}
Cluster::~Cluster() {
QPID_LOG(trace, *this << " Leaving cluster.");
try {
cpg.leave(name);
dispatcher.join();
}
catch (const std::exception& e) {
QPID_LOG(error, "Exception leaving cluster " << *this << ": "
<< 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);
}
void Cluster::notify() {
AMQFrame frame(in_place<ClusterNotifyBody>(ProtocolVersion(), url));
handle(frame);
}
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::deliver(
cpg_handle_t /*handle*/,
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 << " from: " << from);
if (frame.getChannel() == 0)
handleClusterFrame(from, frame);
else
next->handle(frame);
}
bool Cluster::wait(boost::function<bool(const Cluster&)> predicate,
Duration timeout) const
{
AbsTime deadline(now(), timeout);
Mutex::ScopedLock l(lock);
while (!predicate(*this) && lock.wait(deadline))
;
return (predicate(*this));
}
// Handle cluster control frame from the null session.
void Cluster::handleClusterFrame(Id from, AMQFrame& frame) {
// TODO aconway 2007-06-20: use visitor pattern here.
ClusterNotifyBody* notifyIn=
dynamic_cast<ClusterNotifyBody*>(frame.getBody());
assert(notifyIn);
MemberList list;
{
Mutex::ScopedLock l(lock);
members[from].url=notifyIn->getUrl();
lock.notifyAll();
QPID_LOG(trace, *this << ": members joined: " << members);
}
}
void Cluster::configChange(
cpg_handle_t /*handle*/,
cpg_name */*group*/,
cpg_address */*current*/, int /*nCurrent*/,
cpg_address *left, int nLeft,
cpg_address *joined, int nJoined)
{
bool newMembers=false;
MemberList updated;
{
Mutex::ScopedLock l(lock);
if (nLeft) {
for (int i = 0; i < nLeft; ++i)
members.erase(Id(left[i]));
QPID_LOG(trace, *this << ": members left: " << members);
lock.notifyAll();
}
newMembers = nJoined > 1 || (nJoined==1 && Id(joined[0]) != self);
// We don't record members joining here, we record them when
// we get their ClusterNotify message.
}
if (newMembers) // Notify new members of my presence.
notify();
}
void Cluster::run() {
cpg.dispatchBlocking();
}
}} // namespace qpid::cluster
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