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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 "Core.h"
#include "EventHandler.h"
#include "HandlerBase.h"
#include "qpid/broker/Broker.h"
#include "qpid/cluster/types.h"
#include "qpid/framing/AMQFrame.h"
#include "qpid/framing/AllInvoker.h"
#include "qpid/framing/Buffer.h"
#include "qpid/log/Statement.h"
namespace qpid {
namespace cluster {
EventHandler::EventHandler(Core& c) :
core(c),
cpg(*this), // FIXME aconway 2010-10-20: belongs on Core.
dispatcher(cpg, core.getBroker().getPoller(), boost::bind(&Core::fatal, &core)),
self(cpg.self())
{}
EventHandler::~EventHandler() {}
void EventHandler::add(const boost::intrusive_ptr<HandlerBase>& handler) {
handlers.push_back(handler);
}
void EventHandler::start() {
dispatcher.start();
}
// Print member ID or "self" if member is self
struct PrettyId {
MemberId id, self;
PrettyId(const MemberId& id_, const MemberId& self_) : id(id_), self(self_) {}
};
std::ostream& operator<<(std::ostream& o, const PrettyId& id) {
if (id.id == id.self) return o << "self";
else return o << id.id;
}
// Deliver CPG message.
void EventHandler::deliver(
cpg_handle_t /*handle*/,
const cpg_name* /*group*/,
uint32_t nodeid,
uint32_t pid,
void* msg,
int msg_len)
{
sender = MemberId(nodeid, pid);
framing::Buffer buf(static_cast<char*>(msg), msg_len);
framing::AMQFrame frame;
while (buf.available()) {
frame.decode(buf);
assert(frame.getBody());
QPID_LOG(trace, "cluster deliver: " << PrettyId(sender, self) << " "
<< *frame.getBody());
try {
invoke(*frame.getBody());
} catch (const std::exception& e) {
// Note: exceptions are assumed to be survivable,
// fatal errors should log a message and call Core::fatal.
QPID_LOG(error, e.what());
}
}
}
void EventHandler::invoke(const framing::AMQBody& body) {
for (Handlers::iterator i = handlers.begin(); i != handlers.end(); ++i)
if ((*i)->invoke(body)) return;
QPID_LOG(error, "Cluster received unknown control: " << body );
assert(0); // Error handling
}
struct PrintAddrs {
PrintAddrs(const cpg_address* a, int n ) : addrs(a), count(n) {}
const cpg_address* addrs;
int count;
};
std::ostream& operator<<(std::ostream& o, const PrintAddrs& pa) {
for (const cpg_address* a = pa.addrs; a != pa.addrs+pa.count; ++a)
o << MemberId(*a) << " ";
return o;
}
// CPG config-change callback.
void EventHandler::configChange (
cpg_handle_t /*handle*/,
const cpg_name */*group*/,
const cpg_address *members, int nMembers,
const cpg_address *left, int nLeft,
const cpg_address *joined, int nJoined)
{
// FIXME aconway 2010-10-20: TODO
QPID_LOG(notice, "cluster: new membership: " << PrintAddrs(members, nMembers));
QPID_LOG_IF(notice, nLeft, "cluster: members left: " << PrintAddrs(left, nLeft));
QPID_LOG_IF(notice, nJoined, "cluster: members joined: " << PrintAddrs(joined, nJoined));
for (Handlers::iterator i = handlers.begin(); i != handlers.end(); ++i) {
for (int l = 0; l < nLeft; ++l) (*i)->left(left[l]);
for (int j = 0; j < nJoined; ++j) (*i)->joined(joined[j]);
}
}
}} // namespace qpid::cluster
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