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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 "JoiningHandler.h"
#include "Cluster.h"
#include "qpid/framing/ClusterDumpRequestBody.h"
#include "qpid/framing/ClusterReadyBody.h"
#include "qpid/log/Statement.h"
namespace qpid {
namespace cluster {
using namespace sys;
using namespace framing;
JoiningHandler::JoiningHandler(Cluster& c) : ClusterHandler(c), state(START), catchUpConnections(0) {}
void JoiningHandler::configChange(
cpg_address *current, int nCurrent,
cpg_address */*left*/, int nLeft,
cpg_address */*joined*/, int /*nJoined*/)
{
if (nLeft == 0 && nCurrent == 1 && *current == cluster.self) { // First in cluster.
QPID_LOG(notice, cluster.self << " first in cluster.");
cluster.map.ready(cluster.self, cluster.url);
cluster.unstall();
}
}
void JoiningHandler::deliver(Event& e) {
// Discard connection events unless we are stalled to receive a dump.
if (state == STALLED)
cluster.connectionEventQueue.push(e);
else
QPID_LOG(trace, "Discarded pre-join event " << e);
}
void JoiningHandler::update(const MemberId&, const framing::FieldTable& members, uint64_t dumper) {
cluster.map.update(members, dumper);
QPID_LOG(debug, "Cluster update: " << cluster.map);
checkDumpRequest();
}
void JoiningHandler::checkDumpRequest() {
if (state == START && !cluster.map.dumper) {
cluster.broker.getPort(); // ensure the broker is listening.
state = DUMP_REQUESTED;
cluster.mcastControl(ClusterDumpRequestBody(framing::ProtocolVersion(), cluster.url.str()), 0);
}
}
void JoiningHandler::dumpRequest(const MemberId& dumpee, const std::string& ) {
if (cluster.map.dumper) { // Already a dump in progress.
if (dumpee == cluster.self && state == DUMP_REQUESTED)
state = START; // Need to make another request.
}
else { // Start a new dump
cluster.map.dumper = cluster.map.first();
QPID_LOG(debug, "Starting dump, dumper=" << cluster.map.dumper << " dumpee=" << dumpee);
if (dumpee == cluster.self) { // My turn
switch (state) {
case START:
case STALLED:
assert(0); break;
case DUMP_REQUESTED:
QPID_LOG(debug, cluster.self << " stalling for dump from " << cluster.map.dumper);
state = STALLED;
cluster.stall();
break;
case DUMP_COMPLETE:
QPID_LOG(debug, cluster.self << " at start point and dump complete, ready.");
cluster.ready();
break;
}
}
}
}
void JoiningHandler::ready(const MemberId& id, const std::string& url) {
cluster.map.ready(id, Url(url));
checkDumpRequest();
}
void JoiningHandler::insert(const boost::intrusive_ptr<Connection>& c) {
if (c->isCatchUp()) {
++catchUpConnections;
QPID_LOG(debug, "Catch-up connection " << *c << " started, total " << catchUpConnections);
}
cluster.connections.insert(Cluster::ConnectionMap::value_type(c->getId(), c));
}
void JoiningHandler::catchUpClosed(const boost::intrusive_ptr<Connection>& c) {
QPID_LOG(debug, "Catch-up complete for " << *c << ", remaining catch-ups: " << catchUpConnections-1);
if (c->isShadow())
cluster.connections.insert(Cluster::ConnectionMap::value_type(c->getId(), c));
if (--catchUpConnections == 0)
dumpComplete();
}
void JoiningHandler::dumpComplete() {
// FIXME aconway 2008-09-18: need to detect incomplete dump.
//
if (state == STALLED) {
QPID_LOG(debug, cluster.self << " received dump and stalled at start point, unstalling.");
cluster.ready();
}
else {
QPID_LOG(debug, cluster.self << " received dump, waiting for start point.");
assert(state == DUMP_REQUESTED);
state = DUMP_COMPLETE;
}
}
}} // namespace qpid::cluster
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