/*
 *
 * 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 "QueueRegistry.h"
#include "qpid/log/Statement.h"
#include <sstream>
#include <assert.h>

using namespace qpid::broker;
using namespace qpid::sys;

QueueRegistry::QueueRegistry() :
    counter(1), store(0), parent(0) {}

QueueRegistry::~QueueRegistry(){}

std::pair<Queue::shared_ptr, bool>
QueueRegistry::declare(const string& declareName, bool durable, 
                       bool autoDelete, const OwnershipToken* owner)
{
    RWlock::ScopedWlock locker(lock);
    string name = declareName.empty() ? generateName() : declareName;
    assert(!name.empty());
    QueueMap::iterator i =  queues.find(name);

    if (i == queues.end()) {
        Queue::shared_ptr queue(new Queue(name, autoDelete, durable ? store : 0, owner, parent));
        queues[name] = queue;

        return std::pair<Queue::shared_ptr, bool>(queue, true);
    } else {
        return std::pair<Queue::shared_ptr, bool>(i->second, false);
    }
}

void QueueRegistry::destroyLH (const string& name){
    queues.erase(name);
}

void QueueRegistry::destroy (const string& name){
    RWlock::ScopedWlock locker(lock);
    destroyLH (name);
}

Queue::shared_ptr QueueRegistry::find(const string& name){
    RWlock::ScopedRlock locker(lock);
    QueueMap::iterator i = queues.find(name);
    
    if (i == queues.end()) {
        return Queue::shared_ptr();
    } else {
        return i->second;
    }
}

string QueueRegistry::generateName(){
    string name;
    do {
        std::stringstream ss;
        ss << "tmp_" << counter++;
        name = ss.str();
        // Thread safety: Private function, only called with lock held
        // so this is OK.
    } while(queues.find(name) != queues.end());
    return name;
}

void QueueRegistry::setStore (MessageStore* _store)
{
    assert (store == 0 && _store != 0);
    store = _store;
}

MessageStore* QueueRegistry::getStore() const {
    return store;
}