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 javax.annotation.PreDestroy;
  12 import javax.inject.Inject;
  13 import javax.inject.Singleton;
  14 import org.opendaylight.mdsal.dom.api.DOMDataBroker;
  15 import org.opendaylight.mdsal.dom.api.DOMDataTreeTransaction;
  16 import org.opendaylight.mdsal.dom.api.DOMTransactionChain;
  17 import org.opendaylight.mdsal.dom.api.DOMTransactionChainListener;
  18 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 /**
  23  * Implementation of {@link TransactionChainHandler}.
  24  */
  25 @Singleton
  26 public class TransactionChainHandler implements Handler<DOMTransactionChain>, AutoCloseable {
  27     private static final Logger LOG = LoggerFactory.getLogger(TransactionChainHandler.class);
  28
  29     private final DOMTransactionChainListener transactionChainListener = new DOMTransactionChainListener() {
  30         @Override
  31         public void onTransactionChainFailed(final DOMTransactionChain chain, final DOMDataTreeTransaction transaction,
  32                 final Throwable cause) {
  33             LOG.warn("TransactionChain({}) {} FAILED!", chain, transaction.getIdentifier(), cause);
  34             reset();
  35             throw new RestconfDocumentedException("TransactionChain(" + chain + ") not committed correctly", cause);
  36         }
  37
  38         @Override
  39         public void onTransactionChainSuccessful(final DOMTransactionChain chain) {
  40             LOG.trace("TransactionChain({}) SUCCESSFUL", chain);
  41         }
  42     };
  43
  44     private final DOMDataBroker dataBroker;
  45
  46     private volatile DOMTransactionChain transactionChain;
  47
  48     /**
  49      * Prepare transaction chain service for Restconf services.
  50      */
  51     @Inject
  52     public TransactionChainHandler(final DOMDataBroker dataBroker) {
  53         this.dataBroker = Objects.requireNonNull(dataBroker);
  54         transactionChain = Objects.requireNonNull(dataBroker.createTransactionChain(transactionChainListener));
  55     }
  56
  57     @Override
  58     public DOMTransactionChain get() {
  59         return this.transactionChain;
  60     }
  61
  62     public synchronized void reset() {
  63         LOG.trace("Resetting TransactionChain({})", transactionChain);
  64         transactionChain.close();
  65         transactionChain = dataBroker.createTransactionChain(transactionChainListener);
  66     }
  67
  68     @Override
  69     @PreDestroy
  70     public synchronized void close() {
  71         transactionChain.close();
  72     }
  73 }