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BUG#: 8762
TITLE: PEP 349 implementation.
DESCRIPTION: Improve the availability of the CIMOM by better isolation from faulty providers.

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#include <Pegasus/Common/HashTable.h>
#include <Pegasus/Common/Tracer.h>
#include <Pegasus/Common/CimomMessage.h>
#include "MessageQueue.h"
#include "IDFactory.h"

PEGASUS_USING_STD;

PEGASUS_NAMESPACE_BEGIN

typedef HashTable<Uint32, MessageQueue*, EqualFunc<Uint32>, HashFunc<Uint32> >
    QueueTable;

static QueueTable _queueTable(256);
static Mutex q_table_mut ;

static IDFactory _qidFactory;

Uint32 MessageQueue::getNextQueueId()
{
    return _qidFactory.getID();
}

void MessageQueue::putQueueId(Uint32 queueId)
{
    _qidFactory.putID(queueId);
}

MessageQueue::MessageQueue(const char* name)
   : _queueId(getNextQueueId())
{
    //
    // Copy the name:
    //

    PEG_METHOD_ENTER(TRC_MESSAGEQUEUESERVICE,"MessageQueue::MessageQueue()");

    if (!name)
        name = "";

    _name = new char[strlen(name) + 1];
    strcpy(_name, name);

    PEG_TRACE((TRC_MESSAGEQUEUESERVICE, Tracer::LEVEL3,
        "MessageQueue::MessageQueue  name = %s, queueId = %u", name, _queueId));

    //
    // Insert into queue table:
    //
    AutoMutex autoMut(q_table_mut);
    while (!_queueTable.insert(_queueId, this))
        ;

    PEG_METHOD_EXIT();
}

MessageQueue::~MessageQueue()
{
    // ATTN-A: thread safety!
    PEG_METHOD_ENTER(TRC_MESSAGEQUEUESERVICE,"MessageQueue::~MessageQueue()");
    PEG_TRACE((TRC_MESSAGEQUEUESERVICE, Tracer::LEVEL3,
        "MessageQueue::~MessageQueue queueId = %i, name = %s",
        _queueId,
        _name));

    {
        AutoMutex autoMut(q_table_mut);
        _queueTable.remove(_queueId);
    } // mutex unlocks here

    // Free the name:

    delete [] _name;

    // Return the queue id.

    putQueueId(_queueId);

    PEG_METHOD_EXIT();
}

void MessageQueue::enqueue(Message* message)
{
    PEG_METHOD_ENTER(TRC_MESSAGEQUEUESERVICE,"MessageQueue::enqueue()");

    PEGASUS_ASSERT(message != 0);

    PEG_TRACE((TRC_MESSAGEQUEUESERVICE, Tracer::LEVEL3,
        "Queue name: [%s], Message: [%s]",
        getQueueName(),
        MessageTypeToString(message->getType())));

    _messageList.insert_back(message);

    handleEnqueue();
    PEG_METHOD_EXIT();
}

Message* MessageQueue::dequeue()
{
    PEG_METHOD_ENTER(TRC_MESSAGEQUEUESERVICE,"MessageQueue::dequeue()");

    Message* message = _messageList.remove_front();

    PEG_METHOD_EXIT();
    return message;
}

Boolean MessageQueue::isActive()
{
    return true;
}

const char* MessageQueue::getQueueName() const
{
    return _name;
}

MessageQueue* MessageQueue::lookup(Uint32 queueId)
{

    MessageQueue* queue = 0;
    AutoMutex autoMut(q_table_mut);

    if (_queueTable.lookup(queueId, queue))
    {
        return queue;
    }

    // Not found!

    PEG_TRACE((TRC_MESSAGEQUEUESERVICE, Tracer::LEVEL1,
        "MessageQueue::lookup failure queueId = %u", queueId));

    return 0;
}


MessageQueue* MessageQueue::lookup(const char *name)
{

    if (name == NULL)
        throw NullPointer();

    AutoMutex autoMut(q_table_mut);
    for (QueueTable::Iterator i = _queueTable.start(); i; i++)
    {
        // ATTN: Need to decide how many characters to compare in queue names
        if (!strcmp(((MessageQueue *)i.value())->getQueueName(), name))
        {
            return (MessageQueue *)i.value();
        }
    }

    PEG_TRACE((TRC_MESSAGEQUEUESERVICE, Tracer::LEVEL1,
        "MessageQueue::lookup failure - name = %s", name));

    return 0;
}


void MessageQueue::handleEnqueue()
{

}

PEGASUS_NAMESPACE_END