Package com.tangosol.coherence.rest.query

Class CoherenceQueryLanguageEngine

java.lang.Object

com.tangosol.coherence.rest.query.AbstractQueryEngine

com.tangosol.coherence.rest.query.CoherenceQueryLanguageEngine

All Implemented Interfaces:

QueryEngine

public class CoherenceQueryLanguageEngine
extends AbstractQueryEngine

Coherence QL-based implementation of QueryEngine.

The query expression consumed by this implementation is the "where" predicate of the Coherence Query Language.

Note: Although this query engine supports paging, the current implementation still handles entire result set on the client. That can lead to massive memory consumption (and possible OutOfMemoryErrors) if invoked on large caches with an unrestricted query.

Author:

ic 2011.12.04

Nested Class Summary

Nested classes/interfaces inherited from class com.tangosol.coherence.rest.query.AbstractQueryEngine

AbstractQueryEngine.ParsedQuery

Field Summary

Fields

Modifier and Type	Field	Description
static final ExtractorBuilder	EXTRACTOR_BUILDER	ExtractorBuilder to use.
protected final CoherenceQueryLanguage	f_language
static final ExtractorBuilder	MVEL_EXTRACTOR_BUILDER	ExtractorBuilder to use if optional org.mvel.Mvel2 module is on path.

Fields inherited from class com.tangosol.coherence.rest.query.AbstractQueryEngine

m_mapParsedQuery

Fields inherited from interface com.tangosol.coherence.rest.query.QueryEngine

DEFAULT

Constructor Summary

Constructors

Constructor	Description
CoherenceQueryLanguageEngine()

Method Summary

Modifier and Type	Method	Description
Query	prepareQuery(String sQuery, Map<String,Object> mapParams)	Prepares a Query for execution by replacing any parameter placeholders with the appropriate values from the parameter map.

Methods inherited from class com.tangosol.coherence.rest.query.AbstractQueryEngine

convertList, createBindings, parseQueryString, resolveParameterType

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

MVEL_EXTRACTOR_BUILDER

public static final ExtractorBuilder MVEL_EXTRACTOR_BUILDER

ExtractorBuilder to use if optional org.mvel.Mvel2 module is on path.

EXTRACTOR_BUILDER

public static final ExtractorBuilder EXTRACTOR_BUILDER

ExtractorBuilder to use. If optional org.mvel.Mvel2 module is available on path, use MVEL_EXTRACTOR_BUILDER; otherwise, use UniversalExtractorBuilder.

f_language

protected final CoherenceQueryLanguage f_language

Constructor Details

CoherenceQueryLanguageEngine

public CoherenceQueryLanguageEngine()

Method Details

prepareQuery

public Query prepareQuery(String sQuery,
 Map<String,Object> mapParams)

Prepares a Query for execution by replacing any parameter placeholders with the appropriate values from the parameter map.

Parameters:

sQuery - query expression

mapParams - parameter values used to resolve parameters from query expression

Returns:

a Query instance ready for execution