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CoherenceTM v3.3 Copyright© 2000-2007 by Oracle Corporation |
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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.
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(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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Object |
aggregate(Set setEntries)
Process a set of InvocableMap.Entry objects in order to produce an aggregated result. |
Object |
aggregateResults(Collection collResults)
Aggregate the results of the parallel aggregations. |
boolean |
equals(Object o)
Compares this object with another object for equality. |
protected abstract 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(Object o,
boolean fFinal)
Incorporate one aggregatable value into the result. |
void |
readExternal(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. |
String |
toString()
Provide a human-readable representation of this object. |
void |
writeExternal(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, toBitString, toBitString, toBitString |
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(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 Object aggregate(Set setEntries)
aggregate
in interface InvocableMap.EntryAggregator
setEntries
- a Set of read-only InvocableMap.Entry objects to
aggregate
public InvocableMap.EntryAggregator getParallelAggregator()
getParallelAggregator
in interface InvocableMap.ParallelAwareAggregator
public Object aggregateResults(Collection collResults)
aggregateResults
in interface InvocableMap.ParallelAwareAggregator
public 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(Object o, boolean fFinal)
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 Object finalizeResult(boolean fFinal)
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
public String toString()
public int hashCode()
public boolean equals(Object o)
o
- an object reference or null
public void readExternal(DataInput in) throws IOException
readExternal
in interface ExternalizableLite
in
- the DataInput stream to read data from in order to restore
the state of this object
IOException
- if an I/O exception occurs
NotActiveException
- if the object is not in its initial
state, and therefore cannot be deserialized intopublic void writeExternal(DataOutput out) throws IOException
writeExternal
in interface ExternalizableLite
out
- the DataOutput stream to write the state of this object to
IOException
- if an I/O exception occurspublic void readExternal(PofReader in) throws IOException
readExternal
in interface PortableObject
in
- the PofReader from which to read the object's state
IOException
- if an I/O error occurspublic void writeExternal(PofWriter out) throws IOException
writeExternal
in interface PortableObject
out
- the PofWriter to which to write the object's state
IOException
- if an I/O error occurs
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CoherenceTM v3.3 Copyright© 2000-2007 by Oracle Corporation |
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