restconf/restconf-nb-rfc8040/src/main/java/org/opendaylight/restconf/nb/rfc8040/handlers/TransactionChainHandler.java

   1 /*
   2  * Copyright (c) 2016 Cisco Systems, Inc. and others.  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.restconf.nb.rfc8040.handlers;
   9
  10 import java.util.Objects;
  11 import org.opendaylight.mdsal.dom.api.DOMDataBroker;
  12 import org.opendaylight.mdsal.dom.api.DOMDataTreeTransaction;
  13 import org.opendaylight.mdsal.dom.api.DOMTransactionChain;
  14 import org.opendaylight.mdsal.dom.api.DOMTransactionChainListener;
  15 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  16 import org.slf4j.Logger;
  17 import org.slf4j.LoggerFactory;
  18
  19 /**
  20  * Implementation of {@link TransactionChainHandler}.
  21  *
  22  */
  23 public class TransactionChainHandler implements Handler<DOMTransactionChain>, AutoCloseable {
  24     private static final Logger LOG = LoggerFactory.getLogger(TransactionChainHandler.class);
  25
  26     private final DOMTransactionChainListener transactionChainListener = new DOMTransactionChainListener() {
  27         @Override
  28         public void onTransactionChainFailed(final DOMTransactionChain chain, final DOMDataTreeTransaction transaction,
  29                 final Throwable cause) {
  30             LOG.warn("TransactionChain({}) {} FAILED!", chain, transaction.getIdentifier(), cause);
  31             reset();
  32             throw new RestconfDocumentedException("TransactionChain(" + chain + ") not committed correctly", cause);
  33         }
  34
  35         @Override
  36         public void onTransactionChainSuccessful(final DOMTransactionChain chain) {
  37             LOG.trace("TransactionChain({}) SUCCESSFUL", chain);
  38         }
  39     };
  40
  41     private final DOMDataBroker dataBroker;
  42
  43     private volatile DOMTransactionChain transactionChain;
  44
  45     /**
  46      * Prepare transaction chain service for Restconf services.
  47      */
  48     public TransactionChainHandler(final DOMDataBroker dataBroker) {
  49         this.dataBroker = Objects.requireNonNull(dataBroker);
  50         transactionChain = Objects.requireNonNull(dataBroker.createTransactionChain(transactionChainListener));
  51     }
  52
  53     @Override
  54     public DOMTransactionChain get() {
  55         return this.transactionChain;
  56     }
  57
  58     public synchronized void reset() {
  59         LOG.trace("Resetting TransactionChain({})", transactionChain);
  60         transactionChain.close();
  61         transactionChain = dataBroker.createTransactionChain(transactionChainListener);
  62     }
  63
  64     @Override
  65     public synchronized void close() {
  66         transactionChain.close();
  67     }
  68 }