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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 "qpid/cluster/ClusterMap.h"
#include "qpid/Url.h"
#include "qpid/framing/FieldTable.h"
#include "qpid/log/Statement.h"
#include <boost/bind.hpp>
#include <algorithm>
#include <functional>
#include <iterator>
#include <ostream>
using namespace std;
using namespace boost;
namespace qpid {
using namespace framing;
namespace cluster {
namespace {
void addFieldTableValue(FieldTable::ValueMap::value_type vt, ClusterMap::Map& map, ClusterMap::Set& set) {
MemberId id(vt.first);
set.insert(id);
string url = vt.second->get<string>();
if (!url.empty())
map.insert(ClusterMap::Map::value_type(id, Url(url)));
}
void insertFieldTableFromMapValue(FieldTable& ft, const ClusterMap::Map::value_type& vt) {
ft.setString(vt.first.str(), vt.second.str());
}
}
ClusterMap::ClusterMap() : frameSeq(0) {}
ClusterMap::ClusterMap(const Map& map) : frameSeq(0) {
transform(map.begin(), map.end(), inserter(alive, alive.begin()), bind(&Map::value_type::first, _1));
members = map;
}
ClusterMap::ClusterMap(const FieldTable& joinersFt, const FieldTable& membersFt,
framing::SequenceNumber frameSeq_)
: frameSeq(frameSeq_)
{
for_each(joinersFt.begin(), joinersFt.end(), bind(&addFieldTableValue, _1, ref(joiners), ref(alive)));
for_each(membersFt.begin(), membersFt.end(), bind(&addFieldTableValue, _1, ref(members), ref(alive)));
}
void ClusterMap::toMethodBody(framing::ClusterConnectionMembershipBody& b) const {
b.getJoiners().clear();
for_each(joiners.begin(), joiners.end(), bind(&insertFieldTableFromMapValue, ref(b.getJoiners()), _1));
for(Set::const_iterator i = alive.begin(); i != alive.end(); ++i) {
if (!isMember(*i) && !isJoiner(*i))
b.getJoiners().setString(i->str(), string());
}
b.getMembers().clear();
for_each(members.begin(), members.end(), bind(&insertFieldTableFromMapValue, ref(b.getMembers()), _1));
b.setFrameSeq(frameSeq);
}
Url ClusterMap::getUrl(const Map& map, const MemberId& id) {
Map::const_iterator i = map.find(id);
return i == map.end() ? Url() : i->second;
}
MemberId ClusterMap::firstJoiner() const {
return joiners.empty() ? MemberId() : joiners.begin()->first;
}
vector<string> ClusterMap::memberIds() const {
vector<string> ids;
for (Map::const_iterator iter = members.begin();
iter != members.end(); iter++) {
stringstream stream;
stream << iter->first;
ids.push_back(stream.str());
}
return ids;
}
vector<Url> ClusterMap::memberUrls() const {
vector<Url> urls(members.size());
transform(members.begin(), members.end(), urls.begin(),
bind(&Map::value_type::second, _1));
return urls;
}
ClusterMap::Set ClusterMap::getAlive() const { return alive; }
ClusterMap::Set ClusterMap::getMembers() const {
Set s;
transform(members.begin(), members.end(), inserter(s, s.begin()),
bind(&Map::value_type::first, _1));
return s;
}
ostream& operator<<(ostream& o, const ClusterMap::Map& m) {
ostream_iterator<MemberId> oi(o);
transform(m.begin(), m.end(), oi, bind(&ClusterMap::Map::value_type::first, _1));
return o;
}
ostream& operator<<(ostream& o, const ClusterMap& m) {
for (ClusterMap::Set::const_iterator i = m.alive.begin(); i != m.alive.end(); ++i) {
o << *i;
if (m.isMember(*i)) o << "(member)";
else if (m.isJoiner(*i)) o << "(joiner)";
else o << "(unknown)";
o << " ";
}
o << "frameSeq=" << m.getFrameSeq();
return o;
}
bool ClusterMap::updateRequest(const MemberId& id, const string& url) {
try {
if (isAlive(id)) {
joiners[id] = Url(url);
return true;
}
} catch (const Url::Invalid&) {
QPID_LOG(error, "Invalid URL in cluster update request: " << url);
}
return false;
}
bool ClusterMap::ready(const MemberId& id, const Url& url) {
return isAlive(id) && members.insert(Map::value_type(id,url)).second;
}
bool ClusterMap::configChange(const Set& update) {
bool memberChange = false;
Set removed;
set_difference(alive.begin(), alive.end(),
update.begin(), update.end(),
inserter(removed, removed.begin()));
alive = update;
for (Set::const_iterator i = removed.begin(); i != removed.end(); ++i) {
memberChange = memberChange || members.erase(*i);
joiners.erase(*i);
}
return memberChange;
}
optional<Url> ClusterMap::updateOffer(const MemberId& from, const MemberId& to) {
Map::iterator i = joiners.find(to);
if (isAlive(from) && i != joiners.end()) {
Url url= i->second;
joiners.erase(i); // No longer a potential updatee.
return url;
}
return optional<Url>();
}
}} // namespace qpid::cluster
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