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

00001 /*
00002  * Copyright (c) 2000, 2020, Oracle and/or its affiliates.
00003  *
00004  * Licensed under the Universal Permissive License v 1.0 as shown at
00005  * http://oss.oracle.com/licenses/upl.
00006  */
00007 #ifndef COH_COUNT_HPP
00008 #define COH_COUNT_HPP
00009 
00010 #include "coherence/lang.ns"
00011 
00012 #include "coherence/io/pof/PofReader.hpp"
00013 #include "coherence/io/pof/PofWriter.hpp"
00014 #include "coherence/io/pof/PortableObject.hpp"
00015 #include "coherence/util/InvocableMap.hpp"
00016 
00017 COH_OPEN_NAMESPACE3(coherence,util,aggregator)
00018 
00019 using coherence::io::pof::PofReader;
00020 using coherence::io::pof::PofWriter;
00021 using coherence::io::pof::PortableObject;
00022 
00023 
00024 /**
00025 * Calculates a number of values in an entry set.
00026 *
00027 * @author djl  2008.05.12
00028 */
00029 class COH_EXPORT Count
00030     : public class_spec<Count,
00031         extends<Object>,
00032         implements<PortableObject, InvocableMap::ParallelAwareAggregator> >
00033     {
00034     friend class factory<Count>;
00035 
00036     // ----- constructors ---------------------------------------------------
00037 
00038     protected:
00039         /**
00040         * Default constructor (necessary for the PortableObject interface).
00041         */
00042         Count();
00043 
00044 
00045     // ----- EntryAggregator interface --------------------------------------
00046 
00047     public:
00048         /**
00049         * {@inheritDoc}
00050         */
00051         virtual Object::Holder aggregate(Set::View vSetEntries);
00052 
00053 
00054     // ----- ParallelAwareAggregator interface ------------------------------
00055 
00056         /**
00057         * {@inheritDoc}
00058         */
00059         virtual InvocableMap::EntryAggregator::Handle getParallelAggregator();
00060 
00061         /**
00062         * {@inheritDoc}
00063         */
00064         virtual Object::Holder aggregateResults(
00065                     Collection::View vCollResults);
00066 
00067 
00068     // ----- PortableObject interface ---------------------------------------
00069 
00070     public:
00071         /**
00072         * {@inheritDoc}
00073         */
00074         virtual void readExternal(PofReader::Handle hIn);
00075 
00076         /**
00077         * {@inheritDoc}
00078         */
00079         virtual void writeExternal(PofWriter::Handle hOut) const;
00080     };
00081 
00082 COH_CLOSE_NAMESPACE3
00083 
00084 #endif // COH_COUNT_HPP