Oracle Coherence for C++ API
Release 3.7.1.0
E22845-01

coherence/util/aggregator/Count.hpp

/*
* Count.hpp
*
* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
*
* Oracle is a registered trademarks of Oracle Corporation and/or its
* affiliates.
*
* This software is the confidential and proprietary information of Oracle
* Corporation. You shall not disclose such confidential and proprietary
* information and shall use it only in accordance with the terms of the
* license agreement you entered into with Oracle.
*
* This notice may not be removed or altered.
*/
#ifndef COH_COUNT_HPP
#define COH_COUNT_HPP

#include "coherence/lang.ns"

#include "coherence/io/pof/PofReader.hpp"
#include "coherence/io/pof/PofWriter.hpp"
#include "coherence/io/pof/PortableObject.hpp"
#include "coherence/util/InvocableMap.hpp"

COH_OPEN_NAMESPACE3(coherence,util,aggregator)

using coherence::io::pof::PofReader;
using coherence::io::pof::PofWriter;
using coherence::io::pof::PortableObject;


/**
* Calculates a number of values in an entry set.
*
* @author djl  2008.05.12
*/
class COH_EXPORT Count
    : public class_spec<Count,
        extends<Object>,
        implements<PortableObject, InvocableMap::ParallelAwareAggregator> >
    {
    friend class factory<Count>;

    // ----- constructors ---------------------------------------------------

    protected:
        /**
        * Default constructor (necessary for the PortableObject interface).
        */
        Count();


    // ----- EntryAggregator interface --------------------------------------

    public:
        /**
        * {@inheritDoc}
        */
        virtual Object::Holder aggregate(Set::View vSetEntries);


    // ----- ParallelAwareAggregator interface ------------------------------

        /**
        * {@inheritDoc}
        */
        virtual InvocableMap::EntryAggregator::Handle getParallelAggregator();

        /**
        * {@inheritDoc}
        */
        virtual Object::Holder aggregateResults(
                    Collection::View vCollResults);


    // ----- PortableObject interface ---------------------------------------

    public:
        /**
        * {@inheritDoc}
        */
        virtual void readExternal(PofReader::Handle hIn);

        /**
        * {@inheritDoc}
        */
        virtual void writeExternal(PofWriter::Handle hOut) const;
    };

COH_CLOSE_NAMESPACE3

#endif // COH_COUNT_HPP

Copyright © 2000, 2011, Oracle and/or its affiliates. All rights reserved.