org.springframework.cassandra.core

Class CachedPreparedStatementCreator

java.lang.Object

org.springframework.cassandra.core.CachedPreparedStatementCreator

All Implemented Interfaces:

PreparedStatementCreator

public class CachedPreparedStatementCreator
extends Object
implements PreparedStatementCreator

This PreparedStatementCreator maintains a static cache of all prepared statements for the duration of the JVM runtime, more specific the lifecycle of the associated ClassLoader. When preparing statements with Cassandra, each Statement should be prepared once and only once due to the overhead of preparing the statement.

CachedPreparedStatementCreator is thread-safe and does not require external synchronization when used by concurrent threads.

Author:

David Webb, Mark Paluch

Field Summary

Fields

Modifier and Type	Field and Description
protected org.slf4j.Logger	log

Constructor Summary

Constructors

Constructor and Description
CachedPreparedStatementCreator(String cql) Create a PreparedStatementCreator from the provided CQL.

Method Summary

Modifier and Type	Method and Description
com.datastax.driver.core.PreparedStatement	createPreparedStatement(com.datastax.driver.core.Session session) Create a statement in this session.
String	getCql() Returns the CQL statement on which the PreparedStatement will be based.

Methods inherited from class java.lang.Object

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

Field Detail

log

protected final org.slf4j.Logger log

Constructor Detail

CachedPreparedStatementCreator

public CachedPreparedStatementCreator(String cql)

Create a PreparedStatementCreator from the provided CQL.

Parameters:

cql - must not be empty or null.

Method Detail

getCql

public String getCql()

Returns the CQL statement on which the PreparedStatement will be based.

Returns:

a String containing the CQL of the PreparedStatement.

createPreparedStatement

public com.datastax.driver.core.PreparedStatement createPreparedStatement(com.datastax.driver.core.Session session)
                                                                   throws com.datastax.driver.core.exceptions.DriverException

Description copied from interface: PreparedStatementCreator

Create a statement in this session. Allows implementations to use PreparedStatements. The CassandraTemlate will attempt to cache the PreparedStatement for future use without the overhead of re-preparing on the entire cluster.

Specified by:

createPreparedStatement in interface PreparedStatementCreator

Parameters:

session - Session to use to create statement

Returns:

a prepared statement

Throws:

com.datastax.driver.core.exceptions.DriverException - there is no need to catch DriverException that may be thrown in the implementation of this method. The CassandraTemlate class will handle them.