K - the type of the Map entry keysV - the type of the Map entry valuesT - the type of the value to extract fromE - the type of the extracted valuepublic class ReducerAggregator<K,V,T,E> extends AbstractAggregator<K,V,T,E,Map<K,E>>
CacheMap.getAll(Collection) API. Instead of returning the complete
set of values, it will return a portion of value attributes based on the
provided ValueExtractor.
This aggregator could be used in combination with
MultiExtractor allowing one
to collect tuples that are a subset of the attributes of each object stored in
the cache.
ExternalizableHelper.DecoratedMultiBufferReadBuffer, ExternalizableHelper.DefaultObjectStreamFactory, ExternalizableHelper.FormatAwareCompressor, ExternalizableHelper.IntDecoratedObject, ExternalizableHelper.Shielded, ExternalizableHelper.ShieldedDataOutputStream, ExternalizableHelper.ShieldedInputStream, ExternalizableHelper.ShieldedObjectOutputStream, ExternalizableHelper.ShieldedOutputStream, ExternalizableHelper.SimpleXmlBeanClassCache, ExternalizableHelper.Stats, ExternalizableHelper.XmlBeanClassCacheBase.LoggingWriter, Base.StackFrame| Modifier and Type | Field and Description |
|---|---|
protected Map<K,E> |
m_map
The resulting map of reduced values.
|
m_fParallelCONVERTER_FROM_BINARY, CONVERTER_STRIP_INTDECO, CONVERTER_TO_BINARY, DECO_APP_1, DECO_APP_2, DECO_APP_3, DECO_CUSTOM, DECO_EXPIRY, DECO_ID_MAX, DECO_ID_MIN, DECO_JCACHE, DECO_JCACHE_SYNTHETIC, DECO_MEMCACHED, DECO_PUSHREP, DECO_QUEUE_METADATA, DECO_RSVD_1, DECO_RSVD_2, DECO_STORE, DECO_TX, DECO_VALUE, DECO_WLS, EMPTY_BINARY_ARRAY, FMT_B_ARRAY, FMT_BIN_DECO, FMT_BIN_EXT_DECO, FMT_BINARY, FMT_BOOLEAN, FMT_BYTE, FMT_DECIMAL, FMT_DOUBLE, FMT_EXT, FMT_FLOAT, FMT_IDO, FMT_INT, FMT_INTEGER, FMT_LONG, FMT_NONE, FMT_NULL, FMT_OBJ_EXT, FMT_OBJ_SER, FMT_OPT, FMT_OPT_DOUBLE, FMT_OPT_INT, FMT_OPT_LONG, FMT_SHORT, FMT_STRING, FMT_UNKNOWN, FMT_XML_BEAN, FMT_XML_SER, FORCE_RESOLVING_STREAMS, MAX_DECO_HEADER_BYTES, PROPERTY_CONFIG, s_streamfactory, TRINT_DOMAIN_SPAN, TRINT_MAX_VALUE, TRINT_MAX_VARIANCE, USE_POF_STREAMS, USE_XMLBEAN_CLASS_CACHE, XMLBEAN_CLASS_CACHELOG_ALWAYS, LOG_DEBUG, LOG_ERR, LOG_INFO, LOG_MAX, LOG_MIN, LOG_QUIET, LOG_WARN, POWER_0, POWER_G, POWER_K, POWER_M, POWER_T, UNIT_D, UNIT_H, UNIT_M, UNIT_MS, UNIT_NS, UNIT_S, UNIT_USALLOW_INCONSISTENCIES, BY_MEMBER, BY_PARTITION, PARALLEL, PRESENT_ONLY, RETAINS_ENTRIES, SERIAL| Constructor and Description |
|---|
ReducerAggregator()
Default constructor (necessary for the ExternalizableLite interface).
|
ReducerAggregator(String sMethod)
Construct a ReducerAggregator based on the specified method name.
|
ReducerAggregator(ValueExtractor<? super T,? extends E> extractor)
Construct a ReducerAggregator based on the specified extractor.
|
| Modifier and Type | Method and Description |
|---|---|
int |
characteristics()
A bit mask representing the set of characteristics of this aggregator.
|
protected Map<K,E> |
ensureMap()
Return a map that can be used to store reduced values, creating it if
one has not already been created.
|
protected Map<K,E> |
finalizeResult(boolean fFinal)
Obtain the result of the aggregation.
|
protected void |
init(boolean fFinal)
Initialize the aggregation result.
|
protected void |
process(Object o,
boolean fFinal)
Incorporate one aggregatable value into the result.
|
void |
processEntry(InvocableMap.Entry<? extends K,? extends V> entry)
Incorporate one aggregatable entry into the result.
|
InvocableMap.StreamingAggregator<K,V,Object,Map<K,E>> |
supply()
Create a new instance of this aggregator.
|
accumulate, accumulate, combine, ensureInitialized, equals, finalizeResult, getPartialResult, getValueExtractor, hashCode, readExternal, readExternal, toString, writeExternal, writeExternalasBinary, calculatePackedLength, calculatePackedLength, checkObjectInputFilter, convertUTF, decodeExpiry, decorate, decorate, decorate, decorate, decorate, decorateBinary, encodeExpiry, ensureSerializer, extractIntDecoration, fromBinary, fromBinary, fromBinary, fromBinary, fromBinary, fromBinary, fromByteArray, fromByteArray, getClass, getDecoration, getDecoration, getDecorations, getDeltaCompressor, getInputStream, getNewObjectInput, getObjectInput, getObjectOutput, getObjectStreamFactory, getOutputStream, getShieldedOutputStream, getStreamFormat, getUndecorated, getUndecorated, isDecorated, isDecorated, isIntDecorated, isIntDecorated, isResolving, isSerializable, isSerializerCompatible, isVersionCompatible, isVersionCompatible, loadClass, loadResource, main, makeTrint, readBigDecimal, readBigInteger, readBooleanArray, readByteArray, readCollection, readDate, readDoubleArray, readExternalizableLite, readExternalizableLite, readFloatArray, readInt, readInt, readIntArray2d, readLong, readLong, readMap, readMap, readObject, readObject, readSafeUTF, readSafeUTF, readSerializable, readSerializable, readStringArray, readTime, readTimestamp, readTrint, readUnsignedTrint, readUTF, readXmlBean, readXmlSerializable, readXmlSerializable, realize, removeIntDecoration, removeIntDecoration, replace, reportIncompatibleSerializers, setObjectStreamFactory, toBinary, toBinary, toByteArray, toByteArray, toByteArray, toLiteBinary, toLong, undecorate, undecorate, validateBufferSize, writeBigDecimal, writeBigInteger, writeBooleanArray, writeByteArray, writeCollection, writeDate, writeDoubleArray, writeExternalizableLite, writeFloatArray, writeInt, writeInt, writeIntArray2d, writeLong, writeLong, writeMap, writeObject, writeSafeUTF, writeSafeUTF, writeSerializable, writeStringArray, writeTime, writeTimestamp, writeTrint, writeTrint, writeUTF, writeXmlBean, writeXmlSerializablecountBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, rotateLeft, rotateLeft, rotateLeft, rotateRight, rotateRight, rotateRight, toBitString, toBitString, toBitString, toBytes, toBytes, toBytes, toBytes, toInt, toInt, toLongazzert, azzert, azzert, azzertFailed, breakLines, breakLines, capitalize, checkNotEmpty, checkNotNull, checkRange, computeSafeWaitTime, decimalValue, dup, dup, ensureBigDecimal, ensureClassLoader, ensureRuntimeException, ensureRuntimeException, equals, equalsDeep, err, err, err, err, err, escape, formatDateTime, getCallerStackFrame, getCommonMonitor, getCommonMonitor, getCommonMonitor, getContextClassLoader, getContextClassLoader, getDeepMessage, getErr, getLastSafeTimeMillis, getLog, getMaxDecDigits, getMaxHexDigits, getOriginalException, getOut, getProcessRandom, getRandom, getRandomBinary, getRandomBinary, getRandomString, getSafeTimeMillis, getStackFrame, getStackFrames, getStackTrace, getStackTrace, getThreadFactory, getTimeZone, getUpTimeMillis, hashCode, hexValue, indentString, indentString, isDecimal, isHex, isLogEcho, isOctal, log, log, log, log, log, makeInteger, makeLong, makeThread, mod, mod, octalValue, out, out, out, out, out, pad, parseBandwidth, parseBandwidth, parseDelimitedString, parseHex, parseHex, parseMemorySize, parseMemorySize, parsePercentage, parseTime, parseTime, parseTimeNanos, parseTimeNanos, printStackTrace, randomize, randomize, randomize, randomize, read, read, read, read, read, read, read, replace, setErr, setLog, setLogEcho, setOut, sleep, toBandwidthString, toBandwidthString, toCharEscape, toCrc, toCrc, toCrc, toCrc, toCrc, toDecString, toDelimitedString, toDelimitedString, toDelimitedString, toDelimitedString, toHex, toHex, toHexDump, toHexEscape, toHexEscape, toHexEscape, toHexEscape, toHexString, toMemorySizeString, toMemorySizeString, toQuotedCharEscape, toQuotedStringEscape, toSqlString, toString, toString, toStringEscape, toUnicodeEscape, trace, trace, trace, trace, trace, trace, trace, trace, trace, truncateString, truncateString, waitclone, finalize, getClass, notify, notifyAll, wait, wait, waitaggregate, isAllowInconsistencies, isByMember, isByPartition, isParallel, isPresentOnly, isRetainsEntries, isSerialpublic ReducerAggregator()
public ReducerAggregator(String sMethod)
sMethod - the name of the method that is used to extract the
portion of the cached valuepublic ReducerAggregator(ValueExtractor<? super T,? extends E> extractor)
extractor - the extractor that is used to extract the portion
of the cached valuepublic InvocableMap.StreamingAggregator<K,V,Object,Map<K,E>> supply()
InvocableMap.StreamingAggregatorpublic int characteristics()
InvocableMap.StreamingAggregator
Be default, characteristics are a combination of InvocableMap.StreamingAggregator.PARALLEL
and InvocableMap.StreamingAggregator.RETAINS_ENTRIES, which is sub-optimal and should be
overridden by the aggregator implementation if the aggregator does not
need to retain entries (which is often the case).
InvocableMap.StreamingAggregator.PARALLEL,
InvocableMap.StreamingAggregator.SERIAL,
InvocableMap.StreamingAggregator.BY_MEMBER,
InvocableMap.StreamingAggregator.BY_PARTITION,
InvocableMap.StreamingAggregator.RETAINS_ENTRIES,
InvocableMap.StreamingAggregator.PRESENT_ONLYprotected void init(boolean fFinal)
init in class AbstractAggregator<K,V,T,E,Map<K,E>>fFinal - true is passed if the aggregation process that is being
initialized must produce a final aggregation result; this
will only be false if a parallel approach is being used and
the initial (partial) aggregation process is being
initializedpublic void processEntry(InvocableMap.Entry<? extends K,? extends V> entry)
processEntry in class AbstractAggregator<K,V,T,E,Map<K,E>>entry - the entry to incorporate into the aggregation resultprotected void process(Object o, boolean fFinal)
If the fFinal parameter is true, the given object is a partial
result (returned by an individual parallel aggregator) that should be
incorporated into the final result; otherwise, the object is a value
extracted from an InvocableMap.Entry.
protected Map<K,E> finalizeResult(boolean fFinal)
If the fFinal parameter is true, the returned object must be the final result of the aggregation; otherwise, the returned object will be treated as a partial result that should be incorporated into the final result.
finalizeResult in class AbstractAggregator<K,V,T,E,Map<K,E>>fFinal - true to indicate that the final result of the
aggregation process should be returned; this will only
be false if a parallel approach is being used