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## 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 clear both object and list caches either via refetch (eager refresh) or invalidate (lazy refresh).

Since:
  3.0
Author:
  Andrus Adamchik
See Also:
  Serialized Form

Field Summary
`protected String[]` | `groupKeys`
`protected Collection` | `objects`
`protected Query` | `query`

Constructor Summary
`RefreshQuery()` Creates a RefreshQuery that does full refresh of all registered objects, cascading refresh all the way to the shared cache.
`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.
`RefreshQuery(String[] groupKeys)` Creates a RefreshQuery that refreshes query results identified by group keys.

Method Summary
`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.
`String` | `getName()` Returns a symbolic name of the query.
`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

    public RefreshQuery()

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

### 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`

### getName

    public String getName()

  Description copied from interface: `Query`
  Returns a symbolic name of the query. The name may be used as a key to find queries stored in the DataMap. Some query implementors reuse the name as a QueryMetadata cache key. Generally the name can be null.

  Specified by:
    `getName` 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.

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