NETCONF-557: Add support for URL capability
[netconf.git] / 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
9 package org.opendaylight.restconf.nb.rfc8040.handlers;
10
11 import java.util.Objects;
12 import javax.annotation.Nullable;
13 import org.opendaylight.controller.md.sal.common.api.data.AsyncTransaction;
14 import org.opendaylight.controller.md.sal.common.api.data.TransactionChain;
15 import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;
16 import org.opendaylight.controller.md.sal.dom.api.DOMDataBroker;
17 import org.opendaylight.controller.md.sal.dom.api.DOMTransactionChain;
18 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
19 import org.slf4j.Logger;
20 import org.slf4j.LoggerFactory;
21
22
23 /**
24  * Implementation of {@link TransactionChainHandler}.
25  *
26  */
27 public class TransactionChainHandler implements Handler<DOMTransactionChain>, AutoCloseable {
28     private static final Logger LOG = LoggerFactory.getLogger(TransactionChainHandler.class);
29
30     private final TransactionChainListener transactionChainListener = new TransactionChainListener() {
31         @Override
32         public void onTransactionChainFailed(final TransactionChain<?, ?> chain,
33                 final AsyncTransaction<?, ?> transaction, final Throwable cause) {
34             LOG.warn("TransactionChain({}) {} FAILED!", chain, transaction.getIdentifier(), cause);
35             reset();
36             throw new RestconfDocumentedException("TransactionChain(" + chain + ") not committed correctly", cause);
37         }
38
39         @Override
40         public void onTransactionChainSuccessful(final TransactionChain<?, ?> chain) {
41             LOG.trace("TransactionChain({}) {} SUCCESSFUL", chain);
42         }
43     };
44
45     @Nullable
46     private final DOMDataBroker dataBroker;
47     private volatile DOMTransactionChain transactionChain;
48
49     /**
50      * Prepare transaction chain service for Restconf services.
51      */
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     public synchronized void close() {
70         transactionChain.close();
71     }
72 }