io.appform.dropwizard.sharding.dao

Class RelationalDao<T>

java.lang.Object

io.appform.dropwizard.sharding.dao.RelationalDao<T>

All Implemented Interfaces:

ShardedDao<T>

Direct Known Subclasses:

CacheableRelationalDao

public class RelationalDao<T>
extends Object
implements ShardedDao<T>

A dao used to work with entities related to a parent shard. The parent may or maynot 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.

Constructor Summary

Constructors

Constructor and Description
RelationalDao(List<org.hibernate.SessionFactory> sessionFactories, Class<T> entityClass, ShardCalculator<String> shardCalculator) Create a relational DAO.

Method Summary

Modifier and Type	Method and Description
long	count(String parentKey, org.hibernate.criterion.DetachedCriteria criteria)
boolean	exists(String parentKey, Object key)
Optional<T>	get(String parentKey, Object key)
<U> U	get(String parentKey, Object key, Function<T,U> function)
protected Field	getKeyField()
<U> U	runInSession(String id, Function<org.hibernate.Session,U> handler)
Optional<T>	save(String parentKey, T entity)
<U> U	save(String parentKey, T entity, Function<T,U> handler)
boolean	saveAll(String parentKey, Collection<T> entities)
List<T>	scatterGather(org.hibernate.criterion.DetachedCriteria criteria, int start, int numRows)
List<T>	select(String parentKey, org.hibernate.criterion.DetachedCriteria criteria, int first, int numResults)
<U> U	select(String parentKey, org.hibernate.criterion.DetachedCriteria criteria, int first, int numResults, Function<List<T>,U> handler)
boolean	update(String parentKey, org.hibernate.criterion.DetachedCriteria criteria, Function<T,T> updater)
boolean	update(String parentKey, Object id, Function<T,T> updater)
boolean	updateAll(String parentKey, int start, int numRows, org.hibernate.criterion.DetachedCriteria criteria, Function<T,T> updater)

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

RelationalDao

public RelationalDao(List<org.hibernate.SessionFactory> sessionFactories,
                     Class<T> entityClass,
                     ShardCalculator<String> shardCalculator)

Create a relational DAO.

Parameters:

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

entityClass - The class for which the dao will be used.

shardCalculator -

Method Detail

get

public Optional<T> get(String parentKey,
                       Object key)
                throws Exception

Throws:

Exception

get

public <U> U get(String parentKey,
                 Object key,
                 Function<T,U> function)

save

public Optional<T> save(String parentKey,
                        T entity)
                 throws Exception

Throws:

Exception

save

public <U> U save(String parentKey,
                  T entity,
                  Function<T,U> handler)

saveAll

public boolean saveAll(String parentKey,
                       Collection<T> entities)

update

public boolean update(String parentKey,
                      Object id,
                      Function<T,T> updater)

runInSession

public <U> U runInSession(String id,
                          Function<org.hibernate.Session,U> handler)

update

public boolean update(String parentKey,
                      org.hibernate.criterion.DetachedCriteria criteria,
                      Function<T,T> updater)

updateAll

public boolean updateAll(String parentKey,
                         int start,
                         int numRows,
                         org.hibernate.criterion.DetachedCriteria criteria,
                         Function<T,T> updater)

select

public List<T> select(String parentKey,
                      org.hibernate.criterion.DetachedCriteria criteria,
                      int first,
                      int numResults)
               throws Exception

Throws:

Exception

select

public <U> U select(String parentKey,
                    org.hibernate.criterion.DetachedCriteria criteria,
                    int first,
                    int numResults,
                    Function<List<T>,U> handler)
             throws Exception

Throws:

Exception

count

public long count(String parentKey,
                  org.hibernate.criterion.DetachedCriteria criteria)

exists

public boolean exists(String parentKey,
                      Object key)

scatterGather

public List<T> scatterGather(org.hibernate.criterion.DetachedCriteria criteria,
                             int start,
                             int numRows)

getKeyField

protected Field getKeyField()