mappingservice/neutron/src/main/java/org/opendaylight/lispflowmapping/neutron/intenthandler/util/VppNetconfTrasaction.java

   1 /*
   2  * Copyright (c) 2017 Cisco Systems, Inc.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.lispflowmapping.neutron.intenthandler.util;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.util.concurrent.CheckedFuture;
  13
  14 import java.util.concurrent.ExecutionException;
  15
  16 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  17 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
  18 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  19 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  20 import org.opendaylight.yangtools.yang.binding.DataObject;
  21 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  22 import org.slf4j.Logger;
  23 import org.slf4j.LoggerFactory;
  24
  25 /**
  26  * Created by Shakib Ahmed on 1/12/17.
  27  */
  28 public class VppNetconfTrasaction {
  29     private static final Logger LOG = LoggerFactory.getLogger(VppNetconfTrasaction.class);
  30
  31     public static final byte RETRY_COUNT = 5;
  32
  33     public static synchronized <T extends DataObject> Optional<T> read(DataBroker dataBroker,
  34                                                                        LogicalDatastoreType datastoreType,
  35                                                                        InstanceIdentifier<T> instanceIdentifier) {
  36         LOG.trace("Started Netconf transaction on VPP Node");
  37         Preconditions.checkNotNull(dataBroker);
  38
  39         Optional<T> returnData;
  40
  41         int retryCounter = RETRY_COUNT;
  42
  43         while (retryCounter > 0) {
  44             ReadOnlyTransaction readTransaction = dataBroker.newReadOnlyTransaction();
  45             try {
  46                 returnData = readTransaction(instanceIdentifier, datastoreType, readTransaction);
  47                 LOG.trace("Netconf READ transaction SUCCESSFUL. Data present: {}", returnData.isPresent());
  48                 readTransaction.close();
  49                 return returnData;
  50             } catch (IllegalStateException e) {
  51
  52                 LOG.warn("Assuming that netconf read-transaction failed, retrying. Retry Count: " + retryCounter,
  53                             e.getMessage());
  54                 readTransaction.close();
  55             } catch (InterruptedException | ExecutionException e) {
  56                 LOG.warn("Exception while reading data. Retry Aborted.", e.getMessage());
  57                 readTransaction.close();
  58                 break;
  59             }
  60             retryCounter--;
  61         }
  62         return Optional.absent();
  63     }
  64
  65     private static <T extends DataObject> Optional<T> readTransaction(InstanceIdentifier<T> instanceIdentifier,
  66                                                                       LogicalDatastoreType datastoreType,
  67                                                                       ReadOnlyTransaction readTransaction)
  68             throws IllegalStateException, InterruptedException, ExecutionException {
  69
  70         CheckedFuture<Optional<T>, ReadFailedException> futureData =
  71                 readTransaction.read(datastoreType, instanceIdentifier);
  72
  73         return futureData.get();
  74     }
  75 }