Oracle Coherence for C++ API: coherence/util/aggregator/Count.hpp Source File

00001 /*
00002 * Count.hpp
00003 *
00004 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
00005 *
00006 * Oracle is a registered trademarks of Oracle Corporation and/or its
00007 * affiliates.
00008 *
00009 * This software is the confidential and proprietary information of Oracle
00010 * Corporation. You shall not disclose such confidential and proprietary
00011 * information and shall use it only in accordance with the terms of the
00012 * license agreement you entered into with Oracle.
00013 *
00014 * This notice may not be removed or altered.
00015 */
00016 #ifndef COH_COUNT_HPP
00017 #define COH_COUNT_HPP
00018 
00019 #include "coherence/lang.ns"
00020 
00021 #include "coherence/io/pof/PofReader.hpp"
00022 #include "coherence/io/pof/PofWriter.hpp"
00023 #include "coherence/io/pof/PortableObject.hpp"
00024 #include "coherence/util/InvocableMap.hpp"
00025 
00026 COH_OPEN_NAMESPACE3(coherence,util,aggregator)
00027 
00028 using coherence::io::pof::PofReader;
00029 using coherence::io::pof::PofWriter;
00030 using coherence::io::pof::PortableObject;
00031 
00032 
00033 /**
00034 * Calculates a number of values in an entry set.
00035 *
00036 * @author djl  2008.05.12
00037 */
00038 class COH_EXPORT Count
00039     : public class_spec<Count,
00040         extends<Object>,
00041         implements<PortableObject, InvocableMap::ParallelAwareAggregator> >
00042     {
00043     friend class factory<Count>;
00044 
00045     // ----- constructors ---------------------------------------------------
00046 
00047     protected:
00048         /**
00049         * Default constructor (necessary for the PortableObject interface).
00050         */
00051         Count();
00052 
00053 
00054     // ----- EntryAggregator interface --------------------------------------
00055 
00056     public:
00057         /**
00058         * {@inheritDoc}
00059         */
00060         virtual Object::Holder aggregate(Set::View vSetEntries);
00061 
00062 
00063     // ----- ParallelAwareAggregator interface ------------------------------
00064 
00065         /**
00066         * {@inheritDoc}
00067         */
00068         virtual InvocableMap::EntryAggregator::Handle getParallelAggregator();
00069 
00070         /**
00071         * {@inheritDoc}
00072         */
00073         virtual Object::Holder aggregateResults(
00074                     Collection::View vCollResults);
00075 
00076 
00077     // ----- PortableObject interface ---------------------------------------
00078 
00079     public:
00080         /**
00081         * {@inheritDoc}
00082         */
00083         virtual void readExternal(PofReader::Handle hIn);
00084 
00085         /**
00086         * {@inheritDoc}
00087         */
00088         virtual void writeExternal(PofWriter::Handle hOut) const;
00089     };
00090 
00091 COH_CLOSE_NAMESPACE3
00092 
00093 #endif // COH_COUNT_HPP