Package org.apache.cayenne.query

Class RefreshQuery

java.lang.Object

org.apache.cayenne.query.RefreshQuery

All Implemented Interfaces:

Serializable, Query

public class RefreshQuery
extends Object
implements Query

A query that allows to explicitly clear both object and list caches either via refetch (eager refresh) or invalidate (lazy refresh).

Since:

3.0

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected String[]	groupKeys
protected Collection<?>	objects
protected Query	query

Constructor Summary

Constructors

Constructor	Description
RefreshQuery()	Deprecated. since 4.0, "refresh all" query will drop all cache contents
RefreshQuery(String... groupKeys)	Creates a RefreshQuery that refreshes query results identified by group keys.
RefreshQuery(Collection<?> objects)	Creates a RefreshQuery that refreshes a collection of objects, including invalidation of their relationships.
RefreshQuery(Persistent object)	Creates a RefreshQuery that refreshes a single object, including invalidation of its relationships.
RefreshQuery(Query query)	Creates a RefreshQuery that refreshes results of a query and individual objects in the result.

Method Summary

Modifier and Type	Method	Description
SQLAction	createSQLAction(SQLActionVisitor visitor)	A callback method invoked by Cayenne during the final execution phase of the query run.
String[]	getGroupKeys()
QueryMetadata	getMetaData(EntityResolver resolver)	Returns query runtime parameters.
Collection<?>	getObjects()
Query	getQuery()	Returns an internal query, overriding cache policy to force a refresh.
boolean	isRefreshAll()
void	route(QueryRouter router, EntityResolver resolver, Query substitutedQuery)	A callback method invoked by Cayenne during the routing phase of the query execution.

Methods inherited from class java.lang.Object

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

Field Detail

objects

protected Collection<?> objects

query

protected Query query

groupKeys

protected String[] groupKeys

Constructor Detail

RefreshQuery

@Deprecated
public RefreshQuery()

Deprecated.

since 4.0, "refresh all" query will drop all cache contents

Creates a RefreshQuery that does full refresh of all registered objects, cascading refresh all the way to the shared cache.

See Also:

QueryCache.clear()

RefreshQuery

public RefreshQuery(Collection<?> objects)

Creates a RefreshQuery that refreshes a collection of objects, including invalidation of their relationships.

RefreshQuery

public RefreshQuery(Persistent object)

Creates a RefreshQuery that refreshes a single object, including invalidation of its relationships.

RefreshQuery

public RefreshQuery(Query query)

Creates a RefreshQuery that refreshes results of a query and individual objects in the result.

RefreshQuery

public RefreshQuery(String... groupKeys)

Creates a RefreshQuery that refreshes query results identified by group keys.

Method Detail

getMetaData

public QueryMetadata getMetaData(EntityResolver resolver)

Description copied from interface: Query

Returns query runtime parameters. The method is called at various stages of the execution by Cayenne access stack to retrieve query parameters. EntityResolver instance is passed to this method, meaning that the query doesn't need to store direct references to Cayenne mapping objects and can resolve them at runtime.

Specified by:

getMetaData in interface Query

route

public void route(QueryRouter router,
                  EntityResolver resolver,
                  Query substitutedQuery)

Description copied from interface: Query

A callback method invoked by Cayenne during the routing phase of the query execution. Mapping of DataNodes is provided by QueryRouter. Query should use a QueryRouter.route(QueryEngine, Query, Query) callback method to route itself. Query can create one or more substitute queries or even provide its own QueryEngine to execute itself.

Specified by:

route in interface Query

createSQLAction

public SQLAction createSQLAction(SQLActionVisitor visitor)

Description copied from interface: Query

A callback method invoked by Cayenne during the final execution phase of the query run. A concrete query implementation is given a chance to decide how it should be handled. Implementors can pick an appropriate method of the SQLActionVisitor to handle itself, create a custom SQLAction of its own, or substitute itself with another query that should be used for SQLAction construction.

Specified by:

createSQLAction in interface Query

isRefreshAll

public boolean isRefreshAll()

getGroupKeys

public String[] getGroupKeys()

getObjects

public Collection<?> getObjects()

getQuery

public Query getQuery()

Returns an internal query, overriding cache policy to force a refresh. Returns null if no query was set.