com.netflix.astyanax.cql.reads

Class QueryGenCache<Q>

java.lang.Object

com.netflix.astyanax.cql.reads.QueryGenCache<Q>

Type Parameters:

Q -

public abstract class QueryGenCache<Q>
extends java.lang.Object

Template for PreparedStatement caching for a query Q. The class provides the basic functionality to store a cached reference to the PreparedStatement that is generated by the extending class. Hence actual logic for constructing the PrepatedStatement and binding values to that statement is not defined here. That must be provided by the extending classes.

Constructor Summary

Constructors

Constructor and Description
QueryGenCache(java.util.concurrent.atomic.AtomicReference<com.datastax.driver.core.Session> sessionR) Constructor

Method Summary

Modifier and Type	Method and Description
abstract com.datastax.driver.core.BoundStatement	bindValues(com.datastax.driver.core.PreparedStatement pStatement, Q query) Extending classes must implement this with logic for binding the right Astyanax query data with the pre-constructed prepared statement in the right order.
com.datastax.driver.core.BoundStatement	getBoundStatement(Q query, boolean useCaching) Get the bound statement from the prepared statement
com.datastax.driver.core.PreparedStatement	getPreparedStatement(Q query, boolean useCaching) Get the bound statemnent by either constructing the query or using the cached statement underneath.
abstract java.util.concurrent.Callable<com.datastax.driver.core.RegularStatement>	getQueryGen(Q query) Extending classes must implement this with logic for constructing the java driver query from the given Astyanax query

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryGenCache

public QueryGenCache(java.util.concurrent.atomic.AtomicReference<com.datastax.driver.core.Session> sessionR)

Constructor

Parameters:

sessionR -

Method Detail

getBoundStatement

public com.datastax.driver.core.BoundStatement getBoundStatement(Q query,
                                                                 boolean useCaching)

Get the bound statement from the prepared statement

Parameters:

query -

useCaching -

Returns:

BoundStatement

getPreparedStatement

public com.datastax.driver.core.PreparedStatement getPreparedStatement(Q query,
                                                                       boolean useCaching)

Get the bound statemnent by either constructing the query or using the cached statement underneath. Note that the caller can provide useCaching as a knob to turn caching ON/OFF. If false, then the query is just constructed using the extending class and returned. If true, then the cached reference is consulted. If the cache is empty, then the query is constructed and used to seed the cache.

Parameters:

query -

useCaching -

Returns:

PreparedStatement

getQueryGen

public abstract java.util.concurrent.Callable<com.datastax.driver.core.RegularStatement> getQueryGen(Q query)

Extending classes must implement this with logic for constructing the java driver query from the given Astyanax query

Parameters:

query -

Returns:

Callable

bindValues

public abstract com.datastax.driver.core.BoundStatement bindValues(com.datastax.driver.core.PreparedStatement pStatement,
                                                                   Q query)

Extending classes must implement this with logic for binding the right Astyanax query data with the pre-constructed prepared statement in the right order.

Parameters:

pStatement -

query -

Returns:

BoundStatement