cpp/src/qpid/broker/FanOutExchange.cpp

/*
 *
 * 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 "qpid/log/Statement.h"
#include "qpid/broker/FanOutExchange.h"
#include "qpid/broker/FedOps.h"
#include <algorithm>

using namespace qpid::broker;

using std::string;

using namespace qpid::framing;
using namespace qpid::sys;
namespace _qmf = qmf::org::apache::qpid::broker;

FanOutExchange::FanOutExchange(const std::string& _name, Manageable* _parent, Broker* b) :
    Exchange(_name, _parent, b)
{
    if (mgmtExchange != 0)
        mgmtExchange->set_type (typeName);
}

FanOutExchange::FanOutExchange(const std::string& _name, bool _durable,
                               const FieldTable& _args, Manageable* _parent, Broker* b) :
    Exchange(_name, _durable, _args, _parent, b)
{
    if (mgmtExchange != 0)
        mgmtExchange->set_type (typeName);
}

bool FanOutExchange::bind(Queue::shared_ptr queue, const string& /*key*/, const FieldTable* args, AsyncStore* const store)
{
    string fedOp(args ? args->getAsString(qpidFedOp) : fedOpBind);
    string fedTags(args ? args->getAsString(qpidFedTags) : "");
    string fedOrigin(args ? args->getAsString(qpidFedOrigin) : "");
    bool propagate = false;

    if (args == 0 || fedOp.empty() || fedOp == fedOpBind) {
        Binding::shared_ptr binding (new Binding ("", queue, this, args ? *args : FieldTable(), fedOrigin));
        if (bindings.add_unless(binding, MatchQueue(queue))) {
            binding->startManagement();
            propagate = fedBinding.addOrigin(queue->getName(), fedOrigin);
            if (mgmtExchange != 0) {
                mgmtExchange->inc_bindingCount();
            }
        } else {
            // queue already present - still need to track fedOrigin
            fedBinding.addOrigin(queue->getName(), fedOrigin);
            return false;
        }
    } else if (fedOp == fedOpUnbind) {
        propagate = fedBinding.delOrigin(queue->getName(), fedOrigin);
        if (fedBinding.countFedBindings(queue->getName()) == 0)
            unbind(queue, "", args, store);
    } else if (fedOp == fedOpReorigin) {
        if (fedBinding.hasLocal()) {
            propagateFedOp(string(), string(), fedOpBind, string());
        }
    }

    routeIVE();
    if (propagate)
        propagateFedOp(string(), fedTags, fedOp, fedOrigin);
    return true;
}

bool FanOutExchange::unbind(Queue::shared_ptr queue, const string& /*key*/, const FieldTable* args, AsyncStore* const /*store*/)
{
    string fedOrigin(args ? args->getAsString(qpidFedOrigin) : "");
    bool propagate = false;

    QPID_LOG(debug, "Unbinding queue " << queue->getName()
             << " from exchange " << getName() << " origin=" << fedOrigin << ")" );

    if (bindings.remove_if(MatchQueue(queue))) {
        propagate = fedBinding.delOrigin(queue->getName(), fedOrigin);
        if (mgmtExchange != 0) {
            mgmtExchange->dec_bindingCount();
        }
    } else {
        return false;
    }

    if (propagate)
        propagateFedOp(string(), string(), fedOpUnbind, string());
    return true;
}

void FanOutExchange::route(Deliverable& msg)
{
    PreRoute pr(msg, this);
    doRoute(msg, bindings.snapshot());
}
    
bool FanOutExchange::isBound(Queue::shared_ptr queue, const string* const, const FieldTable* const)
{
    BindingsArray::ConstPtr ptr = bindings.snapshot();
    return ptr && std::find_if(ptr->begin(), ptr->end(), MatchQueue(queue)) != ptr->end();
}


FanOutExchange::~FanOutExchange() {}

const std::string FanOutExchange::typeName("fanout");


// DataSource interface - used to write persistence data to async store
// TODO: kpvdr: implement
uint64_t FanOutExchange::getSize() {
    return 0;
}
void FanOutExchange::write(char* /*target*/) {}