Opendaylight流通知

Question

我正在编写一个Opendaylight应用程序，它将在删除、添加或更新流规则时提取所有流规则。

要在添加、删除或更新流时获得通知，应用程序应该提供一个扩展salFlowListener接口的侦听器。但是，当我创建应用程序目录结构时，Opendaylight在线教程中并不清楚逻辑要放在哪里。

此外，当使用YANG模型扩充通知服务时，存在编译错误。

这是获取通知的正确方法吗?是否有任何清晰的在线教程可供我参考？

谢谢。

Answer 1

public class ChangeListener implements DataChangeListener {
private static final Logger logger = LoggerFactory.getLogger(DhcontrollerListener.class);
private DataBroker          dataBroker;

public DhcontrollerListener(DataBroker broker) {
    this.dataBroker = broker;

    //flow
    InstanceIdentifier<Flow> flowPath = InstanceIdentifier.builder(Nodes.class)
        .child(Node.class).augmentation(FlowCapableNode.class).child(Table.class)
        .child(Flow.class).build();
    dataBroker.registerDataChangeListener(LogicalDatastoreType.OPERATIONAL, flowPath, this,
        DataChangeScope.BASE);

}

@Override
public void onDataChanged(AsyncDataChangeEvent<InstanceIdentifier<?>, DataObject> change) {

    if (change == null) {
        logger.info("DhcontrollerListener ===>>> onDataChanged: change is null");
        return;
    }

    handleCreatedFlow(change);
    handleUpdatedFlow(change);
    handleDeletedFlow(change);

}

private void handleCreatedFlow(AsyncDataChangeEvent<InstanceIdentifier<?>, DataObject> change) {
    Map<InstanceIdentifier<?>, DataObject> createdData = change.getCreatedData();
    if (createdData == null) {
        logger.info("handleCreatedFlow ===>>> getRemovedPaths==null");
        return;
    }
    for (Map.Entry<InstanceIdentifier<?>, DataObject> entry : createdData.entrySet()) {
        final DataObject dataObject = entry.getValue();

        if (dataObject instanceof Flow) {
            Flow flow = (Flow) dataObject;
            logger.info("create flow :  " + flow.getCookie() + " " + flow.getKey().toString());
        }

    }
}

private void handleUpdatedFlow(AsyncDataChangeEvent<InstanceIdentifier<?>, DataObject> change) {
    Map<InstanceIdentifier<?>, DataObject> updatedData = change.getCreatedData();
    if (updatedData == null) {
        logger.info("handleUpdatedFlow ===>>> getRemovedPaths==null");
        return;
    }
    for (Map.Entry<InstanceIdentifier<?>, DataObject> entry : updatedData.entrySet()) {
        final DataObject dataObject = entry.getValue();

        if (dataObject instanceof Flow) {
            Flow flow = (Flow) dataObject;
            logger.info("update flow :  " + flow.getCookie() + " " + flow.getKey().toString());
        }

    }
}

private void handleDeletedFlow(AsyncDataChangeEvent<InstanceIdentifier<?>, DataObject> change) {
    Map<InstanceIdentifier<?>, DataObject> originalData = change.getOriginalData();
    Set<InstanceIdentifier<?>> removedData = change.getRemovedPaths();
    if (removedData == null) {
        logger.info("handleDeletedFlow ===>>> getRemovedPaths==null");
        return;
    }
    for (InstanceIdentifier<?> instanceIdentifier : removedData) {
        final DataObject dataObject = originalData.get(instanceIdentifier);

        if (dataObject instanceof Flow) {
            Flow flow = (Flow) dataObject;
            logger.info("remove flow :  " + flow.getCookie() + " " + flow.getPriority() + " "
                        + flow.getMatch().getIpMatch() + " " + flow.getKey().toString());
        }
    }
}

}

我要做的就是设置InstanceIdentifier。设置不同的InstanceIdentifier，还可以监听节点、表等的变化。