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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 "ConnectionObserver.h"
#include "HaBroker.h"
#include "Membership.h"
#include "qpid/broker/Broker.h"
#include "qpid/framing/FieldTable.h"
#include "qpid/management/ManagementAgent.h"
#include "qpid/types/Variant.h"
#include "qmf/org/apache/qpid/ha/EventMembersUpdate.h"
#include "qmf/org/apache/qpid/ha/HaBroker.h"
#include <boost/bind.hpp>
#include <iostream>
#include <iterator>
namespace qpid {
namespace ha {
namespace _qmf = ::qmf::org::apache::qpid::ha;
using sys::Mutex;
using types::Variant;
Membership::Membership(const BrokerInfo& info, HaBroker& b)
: haBroker(b), self(info.getSystemId())
{
brokers[self] = info;
oldStatus = info.getStatus();
}
void Membership::clear() {
Mutex::ScopedLock l(lock);
BrokerInfo me = brokers[self];
brokers.clear();
brokers[self] = me;
}
void Membership::add(const BrokerInfo& b) {
Mutex::ScopedLock l(lock);
assert(b.getSystemId() != self);
brokers[b.getSystemId()] = b;
update(l);
}
void Membership::remove(const types::Uuid& id) {
Mutex::ScopedLock l(lock);
if (id == self) return; // Never remove myself
BrokerInfo::Map::iterator i = brokers.find(id);
if (i != brokers.end()) {
brokers.erase(i);
update(l);
}
}
bool Membership::contains(const types::Uuid& id) {
Mutex::ScopedLock l(lock);
return brokers.find(id) != brokers.end();
}
void Membership::assign(const types::Variant::List& list) {
Mutex::ScopedLock l(lock);
clear();
for (types::Variant::List::const_iterator i = list.begin(); i != list.end(); ++i) {
BrokerInfo b(i->asMap());
brokers[b.getSystemId()] = b;
}
update(l);
}
types::Variant::List Membership::asList() const {
Mutex::ScopedLock l(lock);
return asList(l);
}
types::Variant::List Membership::asList(sys::Mutex::ScopedLock&) const {
types::Variant::List list;
for (BrokerInfo::Map::const_iterator i = brokers.begin(); i != brokers.end(); ++i)
list.push_back(i->second.asMap());
return list;
}
BrokerInfo::Set Membership::otherBackups() const {
Mutex::ScopedLock l(lock);
BrokerInfo::Set result;
for (BrokerInfo::Map::const_iterator i = brokers.begin(); i != brokers.end(); ++i)
if (i->second.getStatus() == READY && i->second.getSystemId() != self)
result.insert(i->second);
return result;
}
BrokerInfo::Set Membership::getBrokers() const {
Mutex::ScopedLock l(lock);
BrokerInfo::Set result;
transform(brokers.begin(), brokers.end(), inserter(result, result.begin()),
bind(&BrokerInfo::Map::value_type::second, _1));
return result;
}
bool Membership::get(const types::Uuid& id, BrokerInfo& result) const {
Mutex::ScopedLock l(lock);
BrokerInfo::Map::const_iterator i = brokers.find(id);
if (i == brokers.end()) return false;
result = i->second;
return true;
}
namespace {
bool checkTransition(BrokerStatus from, BrokerStatus to) {
// Legal state transitions. Initial state is JOINING, ACTIVE is terminal.
static const BrokerStatus TRANSITIONS[][2] = {
{ STANDALONE, JOINING }, // Initialization of backup broker
{ JOINING, CATCHUP }, // Connected to primary
{ JOINING, RECOVERING }, // Chosen as initial primary.
{ CATCHUP, READY }, // Caught up all queues, ready to take over.
{ READY, RECOVERING }, // Chosen as new primary
{ READY, CATCHUP }, // Timed out failing over, demoted to catch-up.
{ RECOVERING, ACTIVE } // All expected backups are ready
};
static const size_t N = sizeof(TRANSITIONS)/sizeof(TRANSITIONS[0]);
for (size_t i = 0; i < N; ++i) {
if (TRANSITIONS[i][0] == from && TRANSITIONS[i][1] == to)
return true;
}
return false;
}
} // namespace
void Membership::update(Mutex::ScopedLock& l) {
QPID_LOG(info, "Membership: " << brokers);
// Update managment and send update event.
BrokerStatus newStatus = getStatus(l);
Variant::List brokerList = asList(l);
if (mgmtObject) {
mgmtObject->set_status(printable(newStatus).str());
mgmtObject->set_members(brokerList);
}
haBroker.getBroker().getManagementAgent()->raiseEvent(
_qmf::EventMembersUpdate(brokerList));
// Update link client properties
framing::FieldTable linkProperties = haBroker.getBroker().getLinkClientProperties();
if (isBackup(newStatus)) {
// Set backup tag on outgoing link properties.
linkProperties.setTable(
ConnectionObserver::BACKUP_TAG, brokers[types::Uuid(self)].asFieldTable());
haBroker.getBroker().setLinkClientProperties(linkProperties);
} else {
// Remove backup tag property from outgoing link properties.
linkProperties.erase(ConnectionObserver::BACKUP_TAG);
haBroker.getBroker().setLinkClientProperties(linkProperties);
}
// Check status transitions
if (oldStatus != newStatus) {
QPID_LOG(info, "Status change: "
<< printable(oldStatus) << " -> " << printable(newStatus));
if (!checkTransition(oldStatus, newStatus)) {
haBroker.shutdown(QPID_MSG("Illegal state transition: " << printable(oldStatus)
<< " -> " << printable(newStatus)));
}
oldStatus = newStatus;
}
}
void Membership::setMgmtObject(boost::shared_ptr<_qmf::HaBroker> mo) {
Mutex::ScopedLock l(lock);
mgmtObject = mo;
update(l);
}
void Membership::setStatus(BrokerStatus newStatus) {
Mutex::ScopedLock l(lock);
brokers[self].setStatus(newStatus);
update(l);
}
BrokerStatus Membership::getStatus() const {
Mutex::ScopedLock l(lock);
return getStatus(l);
}
BrokerStatus Membership::getStatus(sys::Mutex::ScopedLock&) const {
BrokerInfo::Map::const_iterator i = brokers.find(self);
assert(i != brokers.end());
return i->second.getStatus();
}
BrokerInfo Membership::getInfo() const {
Mutex::ScopedLock l(lock);
BrokerInfo::Map::const_iterator i = brokers.find(self);
assert(i != brokers.end());
return i->second;
}
void Membership::setAddress(const Address& a) {
Mutex::ScopedLock l(lock);
brokers[self].setAddress(a);
update(l);
}
}} // namespace qpid::ha
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