org.opendaylight.mdsal.binding.spi

Class ForwardingDataBroker

java.lang.Object

com.google.common.collect.ForwardingObject

org.opendaylight.mdsal.binding.spi.ForwardingDataBroker

All Implemented Interfaces:

BindingService, DataBroker, DataTreeChangeService, TransactionFactory

Direct Known Subclasses:

DataBrokerFailuresImpl

public abstract class ForwardingDataBroker
extends com.google.common.collect.ForwardingObject
implements DataBroker

Utility DataBroker implementation which forwards all interface method invocation to a delegate instance.

Constructor Summary

Constructors

Constructor and Description
ForwardingDataBroker()

Method Summary

Modifier and Type	Method and Description
TransactionChain	createTransactionChain(TransactionChainListener listener) Create a new transaction chain.
protected abstract @NonNull DataBroker	delegate()
ReadTransaction	newReadOnlyTransaction() Allocates a new read-only transaction which provides an immutable snapshot of the data tree.
ReadWriteTransaction	newReadWriteTransaction() Allocates new read-write transaction which provides a mutable view of the data tree.
WriteTransaction	newWriteOnlyTransaction() Allocates new write-only transaction based on latest state of data tree.
<T extends DataObject,L extends DataTreeChangeListener<T>> org.opendaylight.yangtools.concepts.ListenerRegistration<L>	registerDataTreeChangeListener(DataTreeIdentifier<T> treeId, L listener) Registers a DataTreeChangeListener to receive notifications when data changes under a given path in the conceptual data tree.

Methods inherited from class com.google.common.collect.ForwardingObject

toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ForwardingDataBroker

public ForwardingDataBroker()

Method Detail

delegate

protected abstract @NonNull DataBroker delegate()

Specified by:

delegate in class com.google.common.collect.ForwardingObject

newReadOnlyTransaction

public ReadTransaction newReadOnlyTransaction()

Description copied from interface: TransactionFactory

Allocates a new read-only transaction which provides an immutable snapshot of the data tree. The view of data tree is an immutable snapshot of current data tree state when transaction was allocated.

Specified by:

newReadOnlyTransaction in interface TransactionFactory

Returns:

A new read-only transaction

newReadWriteTransaction

public ReadWriteTransaction newReadWriteTransaction()

Description copied from interface: TransactionFactory

Allocates new read-write transaction which provides a mutable view of the data tree.

Preconditions for mutation of data tree are captured from the snapshot of data tree state, when the transaction is allocated. If data was changed during transaction in an incompatible way then the commit of this transaction will fail. See WriteTransaction.commit() for more details about conflicting and non-conflicting changes and failure scenarios.

Specified by:

newReadWriteTransaction in interface TransactionFactory

Returns:

new read-write transaction

newWriteOnlyTransaction

public WriteTransaction newWriteOnlyTransaction()

Description copied from interface: TransactionFactory

Allocates new write-only transaction based on latest state of data tree.

Preconditions for mutation of data tree are captured from the snapshot of data tree state, when the transaction is allocated. If data was changed during transaction in an incompatible way then the commit of this transaction will fail. See WriteTransaction.commit() for more details about conflicting and not-conflicting changes and failure scenarios.

Since this transaction does not provide a view of the data it SHOULD BE used only by callers who are exclusive writers (exporters of data) to the subtree they modify. This prevents optimistic lock failures as described in WriteTransaction.commit().

Exclusivity of writers to particular subtree SHOULD BE enforced by external locking mechanism.

Specified by:

newWriteOnlyTransaction in interface TransactionFactory

Returns:

new write-only transaction

registerDataTreeChangeListener

public <T extends DataObject,L extends DataTreeChangeListener<T>> org.opendaylight.yangtools.concepts.ListenerRegistration<L> registerDataTreeChangeListener(DataTreeIdentifier<T> treeId,
                                                                                                                                                             L listener)

Description copied from interface: DataTreeChangeService

Registers a DataTreeChangeListener to receive notifications when data changes under a given path in the conceptual data tree.

You are able to register for notifications for any node or subtree which can be represented using DataTreeIdentifier.

You are able to register for data change notifications for a subtree or leaf even if it does not exist. You will receive notification once that node is created.

If there is any pre-existing data in the data tree for the path for which you are registering, you will receive an initial data change event, which will contain all pre-existing data, marked as created.

This method returns a ListenerRegistration object. To "unregister" your listener for changes call the ListenerRegistration.close() method on the returned object.

You MUST explicitly unregister your listener when you no longer want to receive notifications. This is especially true in OSGi environments, where failure to do so during bundle shutdown can lead to stale listeners being still registered.

Specified by:

registerDataTreeChangeListener in interface DataTreeChangeService

Parameters:

treeId - Data tree identifier of the subtree which should be watched for changes.

listener - Listener instance which is being registered

Returns:

Listener registration object, which may be used to unregister your listener using ListenerRegistration.close() to stop delivery of change events.

createTransactionChain

public TransactionChain createTransactionChain(TransactionChainListener listener)

Description copied from interface: DataBroker

Create a new transaction chain. The chain will be initialized to read from its backing datastore, with no outstanding transaction. Listener will be registered to handle chain-level events.

Specified by:

createTransactionChain in interface DataBroker

Parameters:

listener - Transaction chain event listener

Returns:

A new transaction chain.