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## org.apache.cayenne
Class CayenneContext

    java.lang.Object
      org.apache.cayenne.BaseContext
          org.apache.cayenne.CayenneContext

All Implemented Interfaces:
  java.io.Serializable, DataChannel, ObjectContext

    public class CayenneContext

extends BaseContext

A default generic implementation of ObjectContext suitable for accessing Cayenne from either an ORM or a client tiers. Communicates with Cayenne via a `DataChannel`.

Since:
  1.2
See Also:
  Serialized Form

Field Summary

Fields inherited from class org.apache.cayenne.BaseContext
`channel, entityResolver, graphAction, queryCache, threadObjectContext, userProperties, validatingObjectsOnCommit`

Fields inherited from interface org.apache.cayenne.DataChannel
`FLUSH_CASCADE_SYNC, FLUSH_NOCASCADE_SYNC, GRAPH_CHANGED_SUBJECT, GRAPH_FLUSHED_SUBJECT, GRAPH_ROLLEDBACK_SUBJECT, ROLLBACK_CASCADE_SYNC`

Constructor Summary
`CayenneContext()` Creates a new CayenneContext with no channel and disabled graph events.
`CayenneContext(DataChannel channel)` Creates a new CayenneContext, initializing it with a channel instance.
`CayenneContext(DataChannel channel, boolean changeEventsEnabled, boolean lifecyleEventsEnabled)` Creates a new CayenneContext, initializing it with a channel.

Method Summary
`protected void` | `attachToChannel(DataChannel channel)` Attaches to a provided DataChannel.
`void` | `commitChanges()` Commits changes to uncommitted objects.
`void` | `commitChangesToParent()` Flushes all changes to objects in this context to the parent DataChannel.
`ObjectContext` | `createChildContext()` Creates and returns a new child ObjectContext.
`java.util.Collection<?>` | `deletedObjects()` Returns a collection of objects that are registered with this ObjectContext and have a state PersistenceState.DELETED
`GraphManager` | `getGraphManager()` Returns GraphManager that manages object graph associated with this context.
`boolean` | `hasChanges()` Returns `true` if there are any modified, deleted or new objects registered with this CayenneContext, `false` otherwise.
`boolean` | `isChangeEventsEnabled()` Returns true if this context posts individual object modification events.
`boolean` | `isLifecycleEventsEnabled()` Returns true if this context posts lifecycle events.
`java.util.Collection<?>` | `modifiedObjects()` Returns a collection of objects that are registered with this ObjectContext and have a state PersistenceState.MODIFIED
`
`<T> T`
` | `newObject(java.lang.Class<T> persistentClass)` Creates and registers a new Persistent object instance.
`java.util.Collection<?>` | `newObjects()` Returns a collection of objects that are registered with this ObjectContext and have a state PersistenceState.NEW
`protected GraphDiff` | `onContextFlush(ObjectContext originatingContext, GraphDiff changes, boolean cascade)`
`QueryResponse` | `onQuery(ObjectContext context, Query query)` Executes a query, using provided context to register persistent objects if query returns any objects.
`QueryResponse` | `performGenericQuery(Query query)` Executes any kind of query providing the result in a form of QueryResponse.
`java.util.List` | `performQuery(Query query)` Runs a query, returning result as list.
`void` | `registerNewObject(java.lang.Object object)` Registers a transient object with the context.
`void` | `rollbackChanges()` Resets all uncommitted changes made to the objects in this ObjectContext, cascading rollback operation all the way through the stack.
`void` | `rollbackChangesLocally()` Resets all uncommitted changes made to the objects in this ObjectContext.
`java.util.Collection<?>` | `uncommittedObjects()` Returns a collection of MODIFIED, DELETED or NEW objects.

Methods inherited from class org.apache.cayenne.BaseContext
`attachToRuntime, attachToRuntimeIfNeeded, bindThreadObjectContext, deleteObject, deleteObjects, deleteObjects, fireDataChannelChanged, fireDataChannelCommitted, fireDataChannelRolledback, getChannel, getEntityResolver, getEventManager, getQueryCache, getThreadObjectContext, getUserProperties, getUserProperty, injectInitialValue, invalidateObjects, invalidateObjects, isValidatingObjectsOnCommit, localObject, localObject, onSync, prepareForAccess, propertyChanged, setChannel, setEntityResolver, setQueryCache, setUserProperty, setValidatingObjectsOnCommit`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### CayenneContext

    public CayenneContext()

  Creates a new CayenneContext with no channel and disabled graph events.

### CayenneContext

    public CayenneContext(DataChannel channel)

  Creates a new CayenneContext, initializing it with a channel instance. CayenneContext created using this constructor WILL NOT broadcast graph change events.

### CayenneContext

    public CayenneContext(DataChannel channel,
                          boolean changeEventsEnabled,
                          boolean lifecyleEventsEnabled)

  Creates a new CayenneContext, initializing it with a channel.

Method Detail

### attachToChannel

    protected void attachToChannel(DataChannel channel)

  Description copied from class: `BaseContext`
  Attaches to a provided DataChannel.

  Overrides:
    `attachToChannel` in class `BaseContext`
  Since:
    3.1

### isChangeEventsEnabled

    public boolean isChangeEventsEnabled()

  Returns true if this context posts individual object modification events. Subject used for these events is `ObjectContext.GRAPH_CHANGED_SUBJECT`.

### isLifecycleEventsEnabled

    public boolean isLifecycleEventsEnabled()

  Returns true if this context posts lifecycle events. Subjects used for these events are `ObjectContext.GRAPH_COMMIT_STARTED_SUBJECT, ObjectContext.GRAPH_COMMITTED_SUBJECT, ObjectContext.GRAPH_COMMIT_ABORTED_SUBJECT, ObjectContext.GRAPH_ROLLEDBACK_SUBJECT.` .

### getGraphManager

    public GraphManager getGraphManager()

  Description copied from interface: `ObjectContext`
  Returns GraphManager that manages object graph associated with this context.

  Specified by:
    `getGraphManager` in interface `ObjectContext`
  Specified by:
    `getGraphManager` in class `BaseContext`

### commitChanges

    public void commitChanges()

  Commits changes to uncommitted objects. First checks if there are changes in this context and if any changes are detected, sends a commit message to remote Cayenne service via an internal instance of CayenneConnector.

  Specified by:
    `commitChanges` in interface `ObjectContext`
  Specified by:
    `commitChanges` in class `BaseContext`

### commitChangesToParent

    public void commitChangesToParent()

  Description copied from interface: `ObjectContext`
  Flushes all changes to objects in this context to the parent DataChannel. Same as `ObjectContext.commitChanges()`, but no cascading flush occurs.

  Specified by:
    `commitChangesToParent` in interface `ObjectContext`
  Specified by:
    `commitChangesToParent` in class `BaseContext`

### rollbackChanges

    public void rollbackChanges()

  Description copied from interface: `ObjectContext`
  Resets all uncommitted changes made to the objects in this ObjectContext, cascading rollback operation all the way through the stack.

  Specified by:
    `rollbackChanges` in interface `ObjectContext`
  Specified by:
    `rollbackChanges` in class `BaseContext`

### rollbackChangesLocally

    public void rollbackChangesLocally()

  Description copied from interface: `ObjectContext`
  Resets all uncommitted changes made to the objects in this ObjectContext. Same as `ObjectContext.rollbackChanges()()`, but rollback is local to this context and no cascading changes undoing occurs.

  Specified by:
    `rollbackChangesLocally` in interface `ObjectContext`
  Specified by:
    `rollbackChangesLocally` in class `BaseContext`

### newObject

    public <T> T newObject(java.lang.Class<T> persistentClass)

  Creates and registers a new Persistent object instance.

  Specified by:
    `newObject` in interface `ObjectContext`
  Specified by:
    `newObject` in class `BaseContext`

### registerNewObject

    public void registerNewObject(java.lang.Object object)

  Description copied from interface: `ObjectContext`
  Registers a transient object with the context. The difference with `ObjectContext.newObject(Class)` is that a user creates an object herself, before attaching it to the context, instead of relying on Cayenne to do that.

  Specified by:
    `registerNewObject` in interface `ObjectContext`
  Specified by:
    `registerNewObject` in class `BaseContext`
  Parameters:
    `object` - new object that needs to be made persistent.
  Since:
    3.0

### performQuery

    public java.util.List performQuery(Query query)

  Runs a query, returning result as list.

  Specified by:
    `performQuery` in interface `ObjectContext`
  Specified by:
    `performQuery` in class `BaseContext`

### performGenericQuery

    public QueryResponse performGenericQuery(Query query)

  Description copied from interface: `ObjectContext`
  Executes any kind of query providing the result in a form of QueryResponse.

  Specified by:
    `performGenericQuery` in interface `ObjectContext`
  Specified by:
    `performGenericQuery` in class `BaseContext`

### onQuery

    public QueryResponse onQuery(ObjectContext context,
                                 Query query)

  Description copied from interface: `DataChannel`
  Executes a query, using provided context to register persistent objects if query returns any objects.

  Parameters:
    `context` - an ObjectContext that originated the query, used to register result objects.
  Returns:
    a generic response object that encapsulates result of the execution.

### uncommittedObjects

    public java.util.Collection<?> uncommittedObjects()

  Description copied from interface: `ObjectContext`
  Returns a collection of MODIFIED, DELETED or NEW objects.

  Specified by:
    `uncommittedObjects` in interface `ObjectContext`
  Specified by:
    `uncommittedObjects` in class `BaseContext`

### deletedObjects

    public java.util.Collection<?> deletedObjects()

  Description copied from interface: `ObjectContext`
  Returns a collection of objects that are registered with this ObjectContext and have a state PersistenceState.DELETED

  Specified by:
    `deletedObjects` in interface `ObjectContext`
  Specified by:
    `deletedObjects` in class `BaseContext`

### modifiedObjects

    public java.util.Collection<?> modifiedObjects()

  Description copied from interface: `ObjectContext`
  Returns a collection of objects that are registered with this ObjectContext and have a state PersistenceState.MODIFIED

  Specified by:
    `modifiedObjects` in interface `ObjectContext`
  Specified by:
    `modifiedObjects` in class `BaseContext`

### newObjects

    public java.util.Collection<?> newObjects()

  Description copied from interface: `ObjectContext`
  Returns a collection of objects that are registered with this ObjectContext and have a state PersistenceState.NEW

  Specified by:
    `newObjects` in interface `ObjectContext`
  Specified by:
    `newObjects` in class `BaseContext`

### createChildContext

    public ObjectContext createChildContext()

  Creates and returns a new child ObjectContext.

  Since:
    3.0

### onContextFlush

    protected GraphDiff onContextFlush(ObjectContext originatingContext,
                                       GraphDiff changes,
                                       boolean cascade)

  Specified by:
    `onContextFlush` in class `BaseContext`

### hasChanges

    public boolean hasChanges()

  Returns `true` if there are any modified, deleted or new objects registered with this CayenneContext, `false` otherwise.

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