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Oracle® Fusion Middleware Java API Reference for Oracle Coherence 12c (12.1.3.0.0) E47890-01 |
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java.lang.Object
com.tangosol.util.Base
com.tangosol.util.BitHelper
com.tangosol.util.ExternalizableHelper
com.tangosol.util.aggregator.AbstractAggregator
public abstract class AbstractAggregator
Abstract base class implementation of InvocableMap.EntryAggregator
that supports parallel aggregation.
Nested Class Summary |
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Nested classes/interfaces inherited from interface com.tangosol.util.InvocableMap.ParallelAwareAggregator |
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InvocableMap.ParallelAwareAggregator.PartialResultAggregator |
Field Summary | |
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protected boolean |
m_fParallel Set to true if this aggregator realizes that it is going to be used in parallel. |
Constructor Summary | |
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AbstractAggregator() Default constructor (necessary for the ExternalizableLite interface). |
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AbstractAggregator(java.lang.String sMethod) Construct an AbstractAggregator that will aggregate values extracted from a set of InvocableMap.Entry objects. |
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AbstractAggregator(ValueExtractor extractor) Construct an AbstractAggregator that will aggregate values extracted from a set of InvocableMap.Entry objects. |
Method Summary | |
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java.lang.Object |
aggregate(java.util.Set setEntries) Process a set of InvocableMap.Entry objects in order to produce an aggregated result. |
java.lang.Object |
aggregateResults(java.util.Collection collResults) Aggregate the partial results of the parallel aggregations into a final result. |
boolean |
equals(java.lang.Object o) Compares this object with another object for equality. |
protected abstract java.lang.Object |
finalizeResult(boolean fFinal) Obtain the result of the aggregation. |
InvocableMap.EntryAggregator |
getParallelAggregator() Get an aggregator that can take the place of this aggregator in situations in which the InvocableMap can aggregate in parallel. |
ValueExtractor |
getValueExtractor() Determine the ValueExtractor whose values this aggregator is aggregating. |
int |
hashCode() Returns a hash code value for this object. |
protected abstract void |
init(boolean fFinal) Initialize the aggregation result. |
protected abstract void |
process(java.lang.Object o, boolean fFinal) Incorporate one aggregatable value into the result. |
protected void |
processEntry(InvocableMap.Entry entry) Incorporate one aggregatable entry into the result. |
void |
readExternal(java.io.DataInput in) Restore the contents of this object by loading the object's state from the passed DataInput object. |
void |
readExternal(PofReader in) Restore the contents of a user type instance by reading its state using the specified PofReader object. |
java.lang.String |
toString() Provide a human-readable representation of this object. |
void |
writeExternal(java.io.DataOutput out) Save the contents of this object by storing the object's state into the passed DataOutput object. |
void |
writeExternal(PofWriter out) Save the contents of a POF user type instance by writing its state using the specified PofWriter object. |
Methods inherited from class com.tangosol.util.BitHelper |
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countBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, rotateLeft, rotateLeft, rotateLeft, rotateRight, rotateRight, rotateRight, toBitString, toBitString, toBitString, toBytes, toBytes, toBytes, toBytes, toInt, toInt, toLong, toLong |
Field Detail |
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protected boolean m_fParallel
Constructor Detail |
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public AbstractAggregator()
public AbstractAggregator(ValueExtractor extractor)
InvocableMap.Entry
objects.
extractor
- the extractor that provides values to aggregatepublic AbstractAggregator(java.lang.String sMethod)
InvocableMap.Entry
objects.
sMethod
- the name of the method that could be invoked via reflection and that returns values to aggregate; this parameter can also be a dot-delimited sequence of method names which would result in an aggregator based on the ChainedExtractor
that is based on an array of corresponding ReflectionExtractor
objectsMethod Detail |
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public java.lang.Object aggregate(java.util.Set setEntries)
aggregate
in interface InvocableMap.EntryAggregator
setEntries
- a Set of read-only InvocableMap.Entry objects to aggregateprotected void processEntry(InvocableMap.Entry entry)
entry
- the entry to incorporate into the aggregation resultpublic InvocableMap.EntryAggregator getParallelAggregator()
If the returned aggregator is a InvocableMap.ParallelAwareAggregator.PartialResultAggregator
, the partial results of the parallel aggregation may be further aggregated
where optimal.
getParallelAggregator
in interface InvocableMap.ParallelAwareAggregator
public java.lang.Object aggregateResults(java.util.Collection collResults)
aggregateResults
in interface InvocableMap.ParallelAwareAggregator
collResults
- the parallel aggregation resultspublic ValueExtractor getValueExtractor()
protected abstract void init(boolean fFinal)
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 initializedprotected abstract void process(java.lang.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
.
o
- the value to incorporate into the aggregated resultfFinal
- true to indicate that the given object is a partial result returned by a parallel aggregatorprotected abstract java.lang.Object 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.
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 usedpublic java.lang.String toString()
public int hashCode()
public boolean equals(java.lang.Object o)
o
- an object reference or nullpublic void readExternal(java.io.DataInput in) throws java.io.IOException
readExternal
in interface ExternalizableLite
in
- the DataInput stream to read data from in order to restore the state of this objectjava.io.IOException
- if an I/O exception occursjava.io.NotActiveException
- if the object is not in its initial state, and therefore cannot be deserialized intopublic void writeExternal(java.io.DataOutput out) throws java.io.IOException
writeExternal
in interface ExternalizableLite
out
- the DataOutput stream to write the state of this object tojava.io.IOException
- if an I/O exception occurspublic void readExternal(PofReader in) throws java.io.IOException
readExternal
in interface PortableObject
in
- the PofReader from which to read the object's statejava.io.IOException
- if an I/O error occurspublic void writeExternal(PofWriter out) throws java.io.IOException
writeExternal
in interface PortableObject
out
- the PofWriter to which to write the object's statejava.io.IOException
- if an I/O error occurs
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Oracle® Fusion Middleware Java API Reference for Oracle Coherence 12c (12.1.3.0.0) E47890-01 |
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