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Oracle® Coherence Java API Reference Release 12.1.2.0.3 E26043-02 |
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java.lang.Object
com.tangosol.util.aggregator.QueryRecorder
public class QueryRecorder
This parallel aggregator used to produce a QueryRecord
object that contains an estimated or actual cost of the query execution for a given filter.
For example, the following code will print a QueryRecord, containing the estimated query cost and corresponding execution steps.
QueryRecorder agent = new QueryRecorder(RecordType.EXPLAIN); QueryRecord record = (QueryRecord) cache.aggregate(filter, agent); System.out.println(record);
Nested Class Summary | |
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static class |
QueryRecorder.RecordType RecordType enum specifies whether the QueryRecorder should be used to produce a QueryRecord object that contains an estimated or an actual cost of the query execution. |
Constructor Summary | |
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QueryRecorder() Default constructor (necessary for the ExternalizableLite interface). |
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QueryRecorder(QueryRecorder.RecordType type) Construct a QueryRecorder. |
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 results of the parallel aggregations. |
InvocableMap.EntryAggregator |
getParallelAggregator() Get an aggregator that can take the place of this aggregator in situations in which the InvocableMap can aggregate in parallel. |
QueryRecorder.RecordType |
getType() Get the record type for this query recorder. |
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. |
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. |
Constructor Detail |
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public QueryRecorder()
public QueryRecorder(QueryRecorder.RecordType type)
type
- the type for this aggregatorMethod Detail |
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public QueryRecorder.RecordType getType()
public java.lang.Object aggregate(java.util.Set setEntries)
aggregate
in interface InvocableMap.EntryAggregator
setEntries
- a Set of read-only InvocableMap.Entry objects to aggregatepublic InvocableMap.EntryAggregator getParallelAggregator()
getParallelAggregator
in interface InvocableMap.ParallelAwareAggregator
public java.lang.Object aggregateResults(java.util.Collection collResults)
aggregateResults
in interface InvocableMap.ParallelAwareAggregator
collResults
- the parallel aggregation resultspublic 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® Coherence Java API Reference Release 12.1.2.0.3 E26043-02 |
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