cpp/lib/broker/LazyLoadedContent.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 <LazyLoadedContent.h>
#include "AMQFrame.h"
#include "framing/ChannelAdapter.h"

using namespace qpid::broker;
using namespace qpid::framing;

LazyLoadedContent::~LazyLoadedContent()
{
    store->destroy(msg);
}

LazyLoadedContent::LazyLoadedContent(MessageStore* const _store, Message* const _msg, uint64_t _expectedSize) : 
    store(_store), msg(_msg), expectedSize(_expectedSize) {}

void LazyLoadedContent::add(AMQContentBody::shared_ptr data)
{
    store->appendContent(msg, data->getData());
}

uint32_t LazyLoadedContent::size()
{
    return 0;//all content is written as soon as it is added
}

void LazyLoadedContent::send(ChannelAdapter& channel, uint32_t framesize)
{
    if (expectedSize > framesize) {        
        for (uint64_t offset = 0; offset < expectedSize; offset += framesize)
        {            
            uint64_t remaining = expectedSize - offset;
            string data;
            store->loadContent(msg, data, offset,
                               remaining > framesize ? framesize : remaining);
            channel.send(new AMQContentBody(data));
        }
    } else {
        string data;
        store->loadContent(msg, data, 0, expectedSize);  
        channel.send(new AMQContentBody(data));
    }
}

void LazyLoadedContent::encode(Buffer&)
{
    //do nothing as all content is written as soon as it is added 
}