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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 "ConnectionInterceptor.h"
#include "qpid/framing/ClusterConnectionCloseBody.h"
#include "qpid/framing/ClusterConnectionDoOutputBody.h"
#include "qpid/framing/AMQFrame.h"
#include <boost/current_function.hpp>
namespace qpid {
namespace cluster {
using namespace framing;
template <class T, class U, class V> void shift(T& a, U& b, const V& c) { a = b; b = c; }
ConnectionInterceptor::ConnectionInterceptor(
broker::Connection& conn, Cluster& clust, Cluster::ShadowConnectionId shadowId_)
: connection(&conn), cluster(clust), isClosed(false), shadowId(shadowId_), output(*this, *conn.getOutput().get())
{
connection->addFinalizer(boost::bind(operator delete, this));
connection->setOutputHandler(&output),
// Attach my functions to Connection extension points.
shift(receivedNext, connection->receivedFn, boost::bind(&ConnectionInterceptor::received, this, _1));
shift(closedNext, connection->closedFn, boost::bind(&ConnectionInterceptor::closed, this));
shift(output.doOutputNext, connection->doOutputFn, boost::bind(&OutputInterceptor::doOutput, &output));
}
ConnectionInterceptor::~ConnectionInterceptor() {
assert(connection == 0);
}
// Forward all received frames to the cluster, continue handling on delivery.
void ConnectionInterceptor::received(framing::AMQFrame& f) {
if (isClosed) return;
cluster.send(f, this);
}
// Continue normal handling of delivered frames.
void ConnectionInterceptor::deliver(framing::AMQFrame& f) {
receivedNext(f);
}
void ConnectionInterceptor::closed() {
if (isClosed) return;
try {
// Called when the local network connection is closed. We still
// need to process any outstanding cluster frames for this
// connection to ensure our sessions are up-to-date. We defer
// closing the Connection object till deliverClosed(), but replace
// its output handler with a null handler since the network output
// handler will be deleted.
//
connection->setOutputHandler(&discardHandler);
cluster.send(AMQFrame(in_place<ClusterConnectionCloseBody>()), this);
isClosed = true;
}
catch (const std::exception& e) {
QPID_LOG(error, QPID_MSG("While closing connection: " << e.what()));
}
}
void ConnectionInterceptor::deliverClosed() {
closedNext();
// Drop reference so connection will be deleted, which in turn
// will delete this via finalizer added in ctor.
connection = 0;
}
void ConnectionInterceptor::dirtyClose() {
// Not closed via cluster self-delivery but closed locally. Used
// when local broker is shut down without a clean cluster shutdown.
// Release the connection, it will delete this.
connection = 0;
}
// Delivery of doOutput allows us to run the real connection doOutput()
// which stocks up the write buffers with data.
//
void ConnectionInterceptor::deliverDoOutput(size_t requested) {
output.deliverDoOutput(requested);
}
}} // namespace qpid::cluster
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