org.exist.storage
Class XQueryPool

java.lang.Object
  org.exist.util.hashtable.AbstractHashtable
      org.exist.util.hashtable.Object2ObjectHashMap
          org.exist.storage.XQueryPool

public class XQueryPool
extends Object2ObjectHashMap

Global pool for pre-compiled XQuery expressions. Expressions are stored and retrieved from the pool by comparing the Source objects from which they were created. For each XQuery, a maximum of MAX_STACK_SIZE compiled expressions are kept in the pool. An XQuery expression will be removed from the pool if it has not been used for a pre-defined timeout. These settings can be configured in conf.xml.

Author:

wolf

Field Summary

static String	CONFIGURATION_ELEMENT_NAME
static int	MAX_POOL_SIZE
static int	MAX_STACK_SIZE
static String	MAX_STACK_SIZE_ATTRIBUTE
static String	POOL_SIZE_ATTTRIBUTE
static String	PROPERTY_MAX_STACK_SIZE
static String	PROPERTY_POOL_SIZE
static String	PROPERTY_TIMEOUT
static String	PROPERTY_TIMEOUT_CHECK_INTERVAL
static long	TIMEOUT
static String	TIMEOUT_ATTRIBUTE
static long	TIMEOUT_CHECK_INTERVAL
static String	TIMEOUT_CHECK_INTERVAL_ATTRIBUTE

Constructor Summary

XQueryPool(Configuration conf)

Method Summary

CompiledXQuery	borrowCompiledXQuery(DBBroker broker, Source source)
ExternalModule	borrowModule(DBBroker broker, Source source, XQueryContext rootContext)
void	returnCompiledXQuery(Source source, CompiledXQuery xquery)

Methods inherited from class org.exist.util.hashtable.Object2ObjectHashMap

get, getIndex, iterator, put, remove, valueIterator

Methods inherited from class org.exist.util.hashtable.AbstractHashtable

getMaxRehash, isPrime, nextPrime, size

Methods inherited from class java.lang.Object

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

Field Detail

MAX_POOL_SIZE

public static final int MAX_POOL_SIZE

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Constant Field Values

MAX_STACK_SIZE

public static final int MAX_STACK_SIZE

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Constant Field Values

TIMEOUT

public static final long TIMEOUT

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Constant Field Values

TIMEOUT_CHECK_INTERVAL

public static final long TIMEOUT_CHECK_INTERVAL

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Constant Field Values

CONFIGURATION_ELEMENT_NAME

public static final String CONFIGURATION_ELEMENT_NAME

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Constant Field Values

MAX_STACK_SIZE_ATTRIBUTE

public static final String MAX_STACK_SIZE_ATTRIBUTE

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Constant Field Values

POOL_SIZE_ATTTRIBUTE

public static final String POOL_SIZE_ATTTRIBUTE

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Constant Field Values

TIMEOUT_ATTRIBUTE

public static final String TIMEOUT_ATTRIBUTE

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Constant Field Values

TIMEOUT_CHECK_INTERVAL_ATTRIBUTE

public static final String TIMEOUT_CHECK_INTERVAL_ATTRIBUTE

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Constant Field Values

PROPERTY_MAX_STACK_SIZE

public static final String PROPERTY_MAX_STACK_SIZE

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Constant Field Values

PROPERTY_POOL_SIZE

public static final String PROPERTY_POOL_SIZE

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Constant Field Values

PROPERTY_TIMEOUT

public static final String PROPERTY_TIMEOUT

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Constant Field Values

PROPERTY_TIMEOUT_CHECK_INTERVAL

public static final String PROPERTY_TIMEOUT_CHECK_INTERVAL

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Constant Field Values

Constructor Detail

XQueryPool

public XQueryPool(Configuration conf)

Parameters:

conf -

Method Detail

returnCompiledXQuery

public void returnCompiledXQuery(Source source,
                                 CompiledXQuery xquery)

borrowCompiledXQuery

public CompiledXQuery borrowCompiledXQuery(DBBroker broker,
                                           Source source)

borrowModule

public ExternalModule borrowModule(DBBroker broker,
                                   Source source,
                                   XQueryContext rootContext)