net.as_development.asdk.db_service.impl.sql

Class SqlStatementCache

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<String,PreparedStatement>

net.as_development.asdk.db_service.impl.sql.SqlStatementCache

All Implemented Interfaces:

Serializable, Cloneable, Map<String,PreparedStatement>

public class SqlStatementCache
extends HashMap<String,PreparedStatement>

Implements a (hash based) cache of PreparedStatement objects.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
SqlStatementCache() create new instance.

Method Summary

Modifier and Type	Method and Description
String	buildCacheId(ISqlGenerator.EStatementType eStatement, Row aMeta, IDBBackendQuery iQuery) generate a new unique cache id for the given set of information.
void	clear() We overload the original clear () method to make sure our cached PreparedStatement objects will be cleaned up in the right way ...

Methods inherited from class java.util.HashMap

clone, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, forEach, get, getOrDefault, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Detail

SqlStatementCache

public SqlStatementCache()

create new instance.

Method Detail

buildCacheId

public String buildCacheId(ISqlGenerator.EStatementType eStatement,
                           Row aMeta,
                           IDBBackendQuery iQuery)
                    throws Exception

generate a new unique cache id for the given set of information.

Parameters:

eStatement - [IN] describe the statement in general. (e.g. insert, update, delete ...)

aMeta - [IN] a set of meta information. (e.g. table name)

iQuery - [IN] the query itself where the prepared statement will stand for. (e.g. we use the query id here)

Returns:

a generated (and hopefully) unique cache id.

Throws:

Exception

clear

public void clear()

We overload the original clear () method to make sure our cached PreparedStatement objects will be cleaned up in the right way ... Such objects should be closed. Otherwise we are running into leaking resources ... ?!

Specified by:

clear in interface Map<String,PreparedStatement>

Overrides:

clear in class HashMap<String,PreparedStatement>