org.aksw.jena_sparql_api.cache.h2

Class CacheCoreH2

java.lang.Object

org.aksw.jena_sparql_api.cache.extra.SqlDaoBase

org.aksw.jena_sparql_api.cache.h2.CacheCoreH2

All Implemented Interfaces:

CacheBackend, CacheCore, SqlDao

public class CacheCoreH2
extends SqlDaoBase
implements CacheCore, CacheBackend

The class is used to cache information about resources to a database. Provides the connection to an H2 database in a light weight, configuration free manner. Important: This implementation of the CacheCoreEx interface uses combined hashes of services and queries.

Author:

Jens Lehmann, Claus Stadler

Field Summary

Fields inherited from class org.aksw.jena_sparql_api.cache.extra.SqlDaoBase

idToQuery, queryToStmt

Constructor Summary

Constructors

Constructor and Description
CacheCoreH2(Connection conn, long lifespan)

Method Summary

Methods

Modifier and Type	Method and Description
CacheEntry	_lookup(String service, String queryString)
static CacheCoreH2	create(boolean autoServerMode, String dbDir, String dbName, long lifespan) Loads the driver
static CacheBackend	create(boolean autoServerMode, String dbDir, String dbName, long lifespan, boolean useCompression)
static CacheCoreH2	create(String dbName)
static CacheCoreH2	create(String dbName, long lifespan)
static CacheBackend	create(String dbName, long lifespan, boolean useCompression)
String	createHashRoot(String service, String queryString)
Iterator<CacheEntryImpl>	iterator() Note: Do not close the InputStream provider on the cache entries as this closes the underlying result set.
CacheEntry	lookup(String queryString)
CacheEntry	lookup(String service, String queryString)
void	write(String queryString, InputStream in)
void	write(String service, String queryString, InputStream in)

Methods inherited from class org.aksw.jena_sparql_api.cache.extra.SqlDaoBase

execute, executeList, executeQuery, getConnection, setConnection, setPreparedStatement

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheCoreH2

public CacheCoreH2(Connection conn,
           long lifespan)
            throws SQLException

Throws:

SQLException

Method Detail

lookup

public CacheEntry lookup(String queryString)

Specified by:

lookup in interface CacheCore

write

public void write(String queryString,
         InputStream in)

Specified by:

write in interface CacheCore

create

public static CacheCoreH2 create(String dbName)
                          throws ClassNotFoundException,
                                 SQLException

Throws:

ClassNotFoundException

SQLException

create

public static CacheCoreH2 create(String dbName,
                 long lifespan)
                          throws ClassNotFoundException,
                                 SQLException

Throws:

ClassNotFoundException

SQLException

create

public static CacheCoreH2 create(boolean autoServerMode,
                 String dbDir,
                 String dbName,
                 long lifespan)
                          throws ClassNotFoundException,
                                 SQLException

Loads the driver

Throws:

ClassNotFoundException

SQLException

create

public static CacheBackend create(boolean autoServerMode,
                  String dbDir,
                  String dbName,
                  long lifespan,
                  boolean useCompression)
                           throws ClassNotFoundException,
                                  SQLException

Throws:

ClassNotFoundException

SQLException

create

public static CacheBackend create(String dbName,
                  long lifespan,
                  boolean useCompression)
                           throws ClassNotFoundException,
                                  SQLException

Throws:

ClassNotFoundException

SQLException

iterator

public Iterator<CacheEntryImpl> iterator()
                                  throws SQLException

Note: Do not close the InputStream provider on the cache entries as this closes the underlying result set.

Returns:

Throws:

SQLException

lookup

public CacheEntry lookup(String service,
                String queryString)

Specified by:

lookup in interface CacheBackend

_lookup

public CacheEntry _lookup(String service,
                 String queryString)
                   throws SQLException

Throws:

SQLException

write

public void write(String service,
         String queryString,
         InputStream in)

Specified by:

write in interface CacheBackend

createHashRoot

public String createHashRoot(String service,
                    String queryString)