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## org.apache.cayenne.access
Class DataDomain

    java.lang.Object
      org.apache.cayenne.access.DataDomain

All Implemented Interfaces:
  QueryEngine, DataChannel

    public class DataDomain

extends Object
implements QueryEngine, DataChannel

DataDomain performs query routing functions in Cayenne. DataDomain creates single data source abstraction hiding multiple physical data sources from the user. When a child DataContext sends a query to the DataDomain, it is transparently routed to an appropriate DataNode.

Author:
  Andrus Adamchik

Field Summary
`static String` | `DATA_CONTEXT_FACTORY_PROPERTY` Defines a property name for storing an optional DataContextFactory.
`protected DataContextFactory` | `dataContextFactory`
`protected EntityResolver` | `entityResolver`
`protected EventManager` | `eventManager`
`protected String` | `name`
`protected Map` | `nodes` Stores mapping of data nodes to DataNode name keys.
`protected Map` | `nodesByDataMapName`
`protected Map` | `properties` Properties configured for DataDomain.
`static String` | `QUERY_CACHE_FACTORY_PROPERTY` Defaines a property name for storing optional `QueryCacheFactory`.
`protected QueryCache` | `queryCache`
`protected QueryCacheFactory` | `queryCacheFactory`
`static boolean` | `SHARED_CACHE_ENABLED_DEFAULT`
`static String` | `SHARED_CACHE_ENABLED_PROPERTY`
`protected boolean` | `sharedCacheEnabled`
`protected DataRowStore` | `sharedSnapshotCache`
`protected boolean` | `stopped`
`protected TransactionDelegate` | `transactionDelegate`
`static boolean` | `USING_EXTERNAL_TRANSACTIONS_DEFAULT`
`static String` | `USING_EXTERNAL_TRANSACTIONS_PROPERTY`
`protected boolean` | `usingExternalTransactions`
`static boolean` | `VALIDATING_OBJECTS_ON_COMMIT_DEFAULT`
`static String` | `VALIDATING_OBJECTS_ON_COMMIT_PROPERTY`
`protected boolean` | `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
`DataDomain(String name)` Creates a DataDomain and assigns it a name.
`DataDomain(String name, Map properties)` Creates new DataDomain.

Method Summary
`void` | `addMap(DataMap map)` Registers new DataMap with this domain.
`void` | `addNode(DataNode node)` Adds new DataNode.
`protected void` | `checkStopped()` Checks that Domain is not stopped.
`void` | `clearDataMaps()` Clears the list of internal DataMaps.
`DataContext` | `createDataContext()` Creates and returns a new DataContext.
`DataContext` | `createDataContext(boolean useSharedCache)` Creates a new DataContext.
`Transaction` | `createTransaction()` Creates and returns a new inactive transaction.
`DataContextFactory` | `getDataContextFactory()`
`Collection` | `getDataMaps()` Returns a collection of registered DataMaps.
`Collection` | `getDataNodes()` Returns an unmodifiable collection of DataNodes associated with this domain.
`EntityResolver` | `getEntityResolver()` Returns an EntityResolver that stores mapping information for this domain.
`EventManager` | `getEventManager()` Returns EventManager used by this DataDomain.
`DataMap` | `getMap(String mapName)` Returns DataMap matching `name` parameter.
`String` | `getName()` Returns "name" property value.
`DataNode` | `getNode(String nodeName)` Returns registered DataNode whose name matches `name` parameter.
`Map` | `getProperties()`
`QueryCache` | `getQueryCache()` Returns shared `QueryCache` used by this DataDomain, creating it on the fly if needed.
`QueryCacheFactory` | `getQueryCacheFactory()` Returns a non-null `QueryCacheFactory`.
`DataRowStore` | `getSharedSnapshotCache()` Returns snapshots cache for this DataDomain, lazily initializing it on the first call if 'sharedCacheEnabled' flag is true.
`TransactionDelegate` | `getTransactionDelegate()`
`void` | `initWithProperties(Map properties)` Reinitializes domain state with a new set of properties.
`boolean` | `isSharedCacheEnabled()` Returns `true` if DataContexts produced by this DataDomain are using shared DataRowStore.
`boolean` | `isUsingExternalTransactions()` Returns whether this DataDomain should internally commit all transactions, or let container do that.
`boolean` | `isValidatingObjectsOnCommit()` Returns whether child DataContexts default behavior is to perform object validation before commit is executed.
`DataNode` | `lookupDataNode(DataMap map)` Returns a DataNode that should handle queries for all entities in a DataMap.
`QueryResponse` | `onQuery(ObjectContext context, Query query)` Runs query returning generic QueryResponse.
`GraphDiff` | `onSync(ObjectContext originatingContext, GraphDiff changes, int syncType)` Only handles commit-type synchronization, ignoring any other type.
`void` | `performQueries(Collection queries, OperationObserver callback)` Routes queries to appropriate DataNodes for execution.
`void` | `reindexNodes()` Updates internal index of DataNodes stored by the entity name.
`void` | `removeDataNode(String nodeName)` Removes a DataNode from DataDomain.
`void` | `removeMap(String mapName)` Removes named DataMap from this DataDomain and any underlying DataNodes that include it.
`void` | `reset()` Closes all data nodes, removes them from the list of available nodes.
`protected void` | `resetProperties()`
`void` | `setDataContextFactory(DataContextFactory dataContextFactory)`
`void` | `setEntityResolver(EntityResolver entityResolver)` Sets EntityResolver.
`void` | `setEventManager(EventManager eventManager)` Sets EventManager used by this DataDomain.
`void` | `setName(String name)` Sets "name" property to a new value.
`void` | `setQueryCacheFactory(QueryCacheFactory queryCacheFactory)`
`void` | `setSharedCacheEnabled(boolean sharedCacheEnabled)`
`void` | `setSharedSnapshotCache(DataRowStore snapshotCache)` Shuts down the previous cache instance, sets cache to the new DataSowStore instance and updates two properties of the new DataSowStore: name and eventManager.
`void` | `setTransactionDelegate(TransactionDelegate transactionDelegate)` Initializes TransactionDelegate used by all DataContexts associated with this DataDomain.
`void` | `setUsingExternalTransactions(boolean flag)` Sets a property defining whether this DataDomain should internally commit all transactions, or let container do that.
`void` | `setValidatingObjectsOnCommit(boolean flag)` Sets the property defining whether child DataContexts should perform object validation before commit is executed.
`void` | `shutdown()` Shutdowns all owned data nodes and marks this domain as stopped.
`String` | `toString()`

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

Field Detail

### SHARED_CACHE_ENABLED_PROPERTY

    public static final String SHARED_CACHE_ENABLED_PROPERTY

See Also:
  Constant Field Values

### SHARED_CACHE_ENABLED_DEFAULT

    public static final boolean SHARED_CACHE_ENABLED_DEFAULT

See Also:
  Constant Field Values

### VALIDATING_OBJECTS_ON_COMMIT_PROPERTY

    public static final String VALIDATING_OBJECTS_ON_COMMIT_PROPERTY

See Also:
  Constant Field Values

### VALIDATING_OBJECTS_ON_COMMIT_DEFAULT

    public static final boolean VALIDATING_OBJECTS_ON_COMMIT_DEFAULT

See Also:
  Constant Field Values

### USING_EXTERNAL_TRANSACTIONS_PROPERTY

    public static final String USING_EXTERNAL_TRANSACTIONS_PROPERTY

See Also:
  Constant Field Values

### USING_EXTERNAL_TRANSACTIONS_DEFAULT

    public static final boolean USING_EXTERNAL_TRANSACTIONS_DEFAULT

See Also:
  Constant Field Values

### DATA_CONTEXT_FACTORY_PROPERTY

    public static final String DATA_CONTEXT_FACTORY_PROPERTY

  Defines a property name for storing an optional DataContextFactory.

  Since:
    1.2
  See Also:
    Constant Field Values

### QUERY_CACHE_FACTORY_PROPERTY

    public static final String QUERY_CACHE_FACTORY_PROPERTY

  Defaines a property name for storing optional `QueryCacheFactory`.

  Since:
    3.0
  See Also:
    Constant Field Values

### nodes

    protected Map nodes

  Stores mapping of data nodes to DataNode name keys.

### nodesByDataMapName

    protected Map nodesByDataMapName

### properties

    protected Map properties

  Properties configured for DataDomain. These include properties of the DataRowStore and remote notifications.

### entityResolver

    protected EntityResolver entityResolver

### sharedSnapshotCache

    protected DataRowStore sharedSnapshotCache

### transactionDelegate

    protected TransactionDelegate transactionDelegate

### dataContextFactory

    protected DataContextFactory dataContextFactory

### queryCacheFactory

    protected QueryCacheFactory queryCacheFactory

### name

    protected String name

### sharedCacheEnabled

    protected boolean sharedCacheEnabled

### validatingObjectsOnCommit

    protected boolean validatingObjectsOnCommit

### usingExternalTransactions

    protected boolean usingExternalTransactions

### eventManager

    protected EventManager eventManager

Since:
  1.2

### queryCache

    protected QueryCache queryCache

Since:
  3.0

### stopped

    protected boolean stopped

Constructor Detail

### DataDomain

    public DataDomain(String name)

  Creates a DataDomain and assigns it a name.

### DataDomain

    public DataDomain(String name,
                      Map properties)

  Creates new DataDomain.

  Parameters:
    `name` - DataDomain name. Domain can be located using its name in the Configuration object.
    `properties` - A Map containing domain configuration properties.

Method Detail

### checkStopped

    protected void checkStopped()
                         throws DomainStoppedException

  Checks that Domain is not stopped. Throws DomainStoppedException otherwise.

  Throws:
    `DomainStoppedException`
  Since:
    3.0

### resetProperties

    protected void resetProperties()

  Since:
    1.1

### initWithProperties

    public void initWithProperties(Map properties)

  Reinitializes domain state with a new set of properties.

  Since:
    1.1

### getEventManager

    public EventManager getEventManager()

  Returns EventManager used by this DataDomain.

  Specified by:
    `getEventManager` in interface `DataChannel`
  Since:
    1.2

### setEventManager

    public void setEventManager(EventManager eventManager)

  Sets EventManager used by this DataDomain.

  Since:
    1.2

### getName

    public String getName()

  Returns "name" property value.

### setName

    public void setName(String name)

  Sets "name" property to a new value.

### isSharedCacheEnabled

    public boolean isSharedCacheEnabled()

  Returns `true` if DataContexts produced by this DataDomain are using shared DataRowStore. Returns `false` if each DataContext would work with its own DataRowStore. Note that this setting can be overwritten per DataContext. See `createDataContext(boolean)`.

### setSharedCacheEnabled

    public void setSharedCacheEnabled(boolean sharedCacheEnabled)

### isValidatingObjectsOnCommit

    public boolean isValidatingObjectsOnCommit()

  Returns whether child DataContexts default behavior is to perform object validation before commit is executed.

  Since:
    1.1

### setValidatingObjectsOnCommit

    public void setValidatingObjectsOnCommit(boolean flag)

  Sets the property defining whether child DataContexts should perform object validation before commit is executed.

  Since:
    1.1

### isUsingExternalTransactions

    public boolean isUsingExternalTransactions()

  Returns whether this DataDomain should internally commit all transactions, or let container do that.

  Since:
    1.1

### setUsingExternalTransactions

    public void setUsingExternalTransactions(boolean flag)

  Sets a property defining whether this DataDomain should internally commit all transactions, or let container do that.

  Since:
    1.1

### getProperties

    public Map getProperties()

  Returns:
    a Map of properties for this DataDomain. There is no guarantees of specific synchronization behavior of this map.
  Since:
    1.1

### getTransactionDelegate

    public TransactionDelegate getTransactionDelegate()

  Returns:
    TransactionDelegate associated with this DataDomain, or null if no delegate exist.
  Since:
    1.1

### setTransactionDelegate

    public void setTransactionDelegate(TransactionDelegate transactionDelegate)

  Initializes TransactionDelegate used by all DataContexts associated with this DataDomain.

  Since:
    1.1

### getSharedSnapshotCache

    public DataRowStore getSharedSnapshotCache()

  Returns snapshots cache for this DataDomain, lazily initializing it on the first call if 'sharedCacheEnabled' flag is true.

### setSharedSnapshotCache

    public void setSharedSnapshotCache(DataRowStore snapshotCache)

  Shuts down the previous cache instance, sets cache to the new DataSowStore instance and updates two properties of the new DataSowStore: name and eventManager.

### getDataContextFactory

    public DataContextFactory getDataContextFactory()

### setDataContextFactory

    public void setDataContextFactory(DataContextFactory dataContextFactory)

### addMap

    public void addMap(DataMap map)

  Registers new DataMap with this domain.

### getMap

    public DataMap getMap(String mapName)

  Returns DataMap matching `name` parameter.

### removeMap

    public void removeMap(String mapName)

  Removes named DataMap from this DataDomain and any underlying DataNodes that include it.

### removeDataNode

    public void removeDataNode(String nodeName)

  Removes a DataNode from DataDomain. Any maps previously associated with this node within domain will still be kept around, however they wan't be mapped to any node.

### getDataMaps

    public Collection getDataMaps()

  Returns a collection of registered DataMaps.

### getDataNodes

    public Collection getDataNodes()

  Returns an unmodifiable collection of DataNodes associated with this domain.

### reset

    public void reset()

  Closes all data nodes, removes them from the list of available nodes.

### clearDataMaps

    public void clearDataMaps()

  Clears the list of internal DataMaps. In most cases it is wise to call "reset" before doing that.

### addNode

    public void addNode(DataNode node)

  Adds new DataNode.

### createDataContext

    public DataContext createDataContext()

  Creates and returns a new DataContext. If this DataDomain is configured to use shared cache, returned DataContext will use shared cache as well. Otherwise a new instance of DataRowStore will be used as its local cache.

### createDataContext

    public DataContext createDataContext(boolean useSharedCache)

  Creates a new DataContext.

  Parameters:
    `useSharedCache` - determines whether resulting DataContext should use shared vs. local cache. This setting overrides default behavior configured for this DataDomain via `SHARED_CACHE_ENABLED_PROPERTY`.
  Since:
    1.1

### createTransaction

    public Transaction createTransaction()

  Creates and returns a new inactive transaction. Returned transaction is bound to the current execution thread.

  If there is a TransactionDelegate, adds the delegate to the newly created Transaction. Behavior of the returned Transaction depends on "usingInternalTransactions" property setting.

  Since:
    1.1

### getNode

    public DataNode getNode(String nodeName)

  Returns registered DataNode whose name matches `name` parameter.

### reindexNodes

    public void reindexNodes()

  Updates internal index of DataNodes stored by the entity name.

### lookupDataNode

    public DataNode lookupDataNode(DataMap map)

  Returns a DataNode that should handle queries for all entities in a DataMap.

  Since:
    1.1

### setEntityResolver

    public void setEntityResolver(EntityResolver entityResolver)

  Sets EntityResolver. If not set explicitly, DataDomain creates a default EntityResolver internally on demand.

  Since:
    1.1

### shutdown

    public void shutdown()

  Shutdowns all owned data nodes and marks this domain as stopped.

### performQueries

    public void performQueries(Collection queries,
                               OperationObserver callback)

  Routes queries to appropriate DataNodes for execution.

  Specified by:
    `performQueries` in interface `QueryEngine`

### onQuery

    public QueryResponse onQuery(ObjectContext context,
                                 Query query)

  Runs query returning generic QueryResponse.

  Specified by:
    `onQuery` in interface `DataChannel`
  Parameters:
    `context` - an ObjectContext that originated the query, used to register result objects.
  Returns:
    a generic response object that encapsulates result of the execution.
  Since:
    1.2

### getEntityResolver

    public EntityResolver getEntityResolver()

  Returns an EntityResolver that stores mapping information for this domain.

  Specified by:
    `getEntityResolver` in interface `QueryEngine`
  Specified by:
    `getEntityResolver` in interface `DataChannel`

### onSync

    public GraphDiff onSync(ObjectContext originatingContext,
                            GraphDiff changes,
                            int syncType)

  Only handles commit-type synchronization, ignoring any other type.

  Specified by:
    `onSync` in interface `DataChannel`
  Parameters:
    `originatingContext` - an ObjectContext that initiated the sync. Can be null.
    `changes` - diff from the context that initiated the sync.
    `syncType` - One of `DataChannel.FLUSH_NOCASCADE_SYNC`, `DataChannel.FLUSH_CASCADE_SYNC`, `DataChannel.ROLLBACK_CASCADE_SYNC`.
  Since:
    1.2

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### getQueryCacheFactory

    public QueryCacheFactory getQueryCacheFactory()

  Returns a non-null `QueryCacheFactory`.

  Since:
    3.0

### setQueryCacheFactory

    public void setQueryCacheFactory(QueryCacheFactory queryCacheFactory)

  Since:
    3.0

### getQueryCache

    public QueryCache getQueryCache()

  Returns shared `QueryCache` used by this DataDomain, creating it on the fly if needed. Uses factory obtained via `getQueryCacheFactory()` to initialize the cache for the first time.

  Since:
    3.0

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