io.appform.dropwizard.sharding.dao

Class WrapperDao<T,DaoType extends io.dropwizard.hibernate.AbstractDAO<T>>

java.lang.Object

io.appform.dropwizard.sharding.dao.WrapperDao<T,DaoType>

All Implemented Interfaces:

ShardedDao<T>

public class WrapperDao<T,DaoType extends io.dropwizard.hibernate.AbstractDAO<T>>
extends Object
implements ShardedDao<T>

A dao used to wrap custom Dao's so that all operations on the DAO's are routed to the same shard for a parent key. The parent may or may not be physically present. A murmur 128 hash of the string parent key is used to route the save and retrieve calls from the proper shard. Note: - Methods in the custom dao will be transactional only if they are annotaded with ShardedTransaction - Use RelationalDao where-ever possible as it will be slight more performant than this due to lack of any proxy.

Constructor Summary

Constructors

Constructor and Description
WrapperDao(List<org.hibernate.SessionFactory> sessionFactories, Class<DaoType> daoClass, Class[] extraConstructorParamClasses, Class[] extraConstructorParamObjects, ShardCalculator<String> shardCalculator) Create a relational DAO.
WrapperDao(List<org.hibernate.SessionFactory> sessionFactories, Class<DaoType> daoClass, ShardCalculator<String> shardCalculator) Create a relational DAO.

Method Summary

Modifier and Type	Method and Description
DaoType	forParent(String parentKey) Get a fully formed DAO that localizes all dao operations to the shard for the given parentKey.

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.appform.dropwizard.sharding.dao.ShardedDao

getShardCalculator

Constructor Detail

WrapperDao

public WrapperDao(List<org.hibernate.SessionFactory> sessionFactories,
                  Class<DaoType> daoClass,
                  ShardCalculator<String> shardCalculator)

Create a relational DAO.

Parameters:

sessionFactories - List of session factories. One for each shard.

daoClass - Class for the dao.

shardCalculator - ShardCalculator for finding shard

WrapperDao

public WrapperDao(List<org.hibernate.SessionFactory> sessionFactories,
                  Class<DaoType> daoClass,
                  Class[] extraConstructorParamClasses,
                  Class[] extraConstructorParamObjects,
                  ShardCalculator<String> shardCalculator)

Create a relational DAO.

Parameters:

sessionFactories - List of session factories, one for each shard

daoClass - Class for the dao.

extraConstructorParamClasses - Class names for constructor parameters to the DAO other than SessionFactory

extraConstructorParamObjects - Objects for constructor parameters to the DAO other than SessionFactory

shardCalculator - ShardCalculator for finding shard

Method Detail

forParent

public DaoType forParent(String parentKey)

Get a fully formed DAO that localizes all dao operations to the shard for the given parentKey.

Parameters:

parentKey - key that will be used to find the shard

Returns:

Wrapper for parent dao