com.amazon.carbonado.qe

Class QueryExecutorCache<S extends Storable>

java.lang.Object

com.amazon.carbonado.qe.QueryExecutorCache<S>

All Implemented Interfaces:

QueryExecutorFactory<S>

public class QueryExecutorCache<S extends Storable>
extends java.lang.Object
implements QueryExecutorFactory<S>

QueryExecutors should be cached since expensive analysis is often required to build them. By default, a minimum of 100 query executors can be cached per Storable type. The minimum can be changed with the "com.amazon.carbonado.qe.QueryExecutorCache.minCapacity" system property.

Author:

Brian S O'Neill

Constructor Summary

Constructors

Constructor and Description
QueryExecutorCache(QueryExecutorFactory<S> factory)

Method Summary

Methods

Modifier and Type	Method and Description
QueryExecutor<S>	executor(Filter<S> filter, OrderingList<S> ordering, QueryHints hints) Returns an executor from the cache.
java.lang.Class<S>	getStorableType()

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryExecutorCache

public QueryExecutorCache(QueryExecutorFactory<S> factory)

Method Detail

getStorableType

public java.lang.Class<S> getStorableType()

Specified by:

getStorableType in interface QueryExecutorFactory<S extends Storable>

executor

public QueryExecutor<S> executor(Filter<S> filter,
                        OrderingList<S> ordering,
                        QueryHints hints)
                                           throws RepositoryException

Returns an executor from the cache.

Specified by:

executor in interface QueryExecutorFactory<S extends Storable>

Parameters:

filter - optional filter

ordering - optional order-by properties

hints - optional query hints

Throws:

RepositoryException