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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 "FailoverManager.h"
#include "qpid/Exception.h"
#include "qpid/log/Statement.h"
#include "qpid/sys/Time.h"
namespace qpid {
namespace client {
using qpid::sys::Monitor;
using qpid::sys::AbsTime;
using qpid::sys::Duration;
FailoverManager::FailoverManager(const ConnectionSettings& s,
ReconnectionStrategy* rs) : settings(s), strategy(rs), state(IDLE) {}
void FailoverManager::execute(Command& c)
{
bool retry = false;
bool completed = false;
AbsTime failed;
while (!completed) {
try {
AsyncSession session = connect().newSession();
if (retry) {
Duration failoverTime(failed, AbsTime::now());
QPID_LOG(info, "Failed over for " << &c << " in " << (failoverTime/qpid::sys::TIME_MSEC) << " milliseconds");
}
c.execute(session, retry);
session.sync();//TODO: shouldn't be required
session.close();
completed = true;
} catch(const TransportFailure&) {
retry = true;
failed = AbsTime::now();
}
}
}
void FailoverManager::close()
{
Monitor::ScopedLock l(lock);
connection.close();
}
Connection& FailoverManager::connect(std::vector<Url> brokers)
{
Monitor::ScopedLock l(lock);
if (state == CANT_CONNECT) {
state = IDLE;//retry
}
while (!connection.isOpen()) {
if (state == CONNECTING) {
lock.wait();
} else if (state == CANT_CONNECT) {
throw CannotConnectException("Cannot establish a connection");
} else {
state = CONNECTING;
Connection c;
attempt(c, settings, brokers.empty() ? connection.getKnownBrokers() : brokers);
if (c.isOpen()) state = IDLE;
else state = CANT_CONNECT;
connection = c;
lock.notifyAll();
}
}
return connection;
}
Connection& FailoverManager::getConnection()
{
Monitor::ScopedLock l(lock);
return connection;
}
void FailoverManager::attempt(Connection& c, ConnectionSettings s, std::vector<Url> urls)
{
Monitor::ScopedUnlock u(lock);
if (strategy) strategy->editUrlList(urls);
if (urls.empty()) {
attempt(c, s);
} else {
for (std::vector<Url>::const_iterator i = urls.begin(); i != urls.end() && !c.isOpen(); ++i) {
for (Url::const_iterator j = i->begin(); j != i->end() && !c.isOpen(); ++j) {
const TcpAddress* tcp = j->get<TcpAddress>();
if (tcp) {
s.host = tcp->host;
s.port = tcp->port;
attempt(c, s);
}
}
}
}
}
void FailoverManager::attempt(Connection& c, ConnectionSettings s)
{
try {
QPID_LOG(info, "Attempting to connect to " << s.host << " on " << s.port << "...");
c.open(s);
QPID_LOG(info, "Connected to " << s.host << " on " << s.port);
} catch (const Exception& e) {
QPID_LOG(info, "Could not connect to " << s.host << " on " << s.port << ": " << e.what());
}
}
}} // namespace qpid::client
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