netconf/sal-netconf-connector/src/main/java/org/opendaylight/netconf/sal/connect/netconf/sal/tx/WriteCandidateTx.java

   1 /*
   2  * Copyright (c) 2014 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.netconf.sal.connect.netconf.sal.tx;
  10
  11 import com.google.common.base.Function;
  12 import com.google.common.base.Optional;
  13 import com.google.common.base.Preconditions;
  14 import com.google.common.util.concurrent.CheckedFuture;
  15 import com.google.common.util.concurrent.FutureCallback;
  16 import com.google.common.util.concurrent.Futures;
  17 import com.google.common.util.concurrent.ListenableFuture;
  18 import javax.annotation.Nullable;
  19 import org.opendaylight.controller.md.sal.common.api.TransactionStatus;
  20 import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
  21 import org.opendaylight.controller.md.sal.dom.api.DOMRpcResult;
  22 import org.opendaylight.netconf.sal.connect.netconf.util.NetconfBaseOps;
  23 import org.opendaylight.netconf.sal.connect.netconf.util.NetconfRpcFutureCallback;
  24 import org.opendaylight.netconf.sal.connect.util.RemoteDeviceId;
  25 import org.opendaylight.yangtools.yang.common.RpcResult;
  26 import org.opendaylight.yangtools.yang.data.api.ModifyAction;
  27 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  28 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  29 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32
  33 /**
  34  * Tx implementation for netconf devices that support only candidate datastore and no writable running.
  35  * The sequence goes as:
  36  * <ol>
  37  *   <li>Lock candidate datastore on tx construction
  38  *     <ul>
  39  *       <li>Lock has to succeed, if it does not, an attempt to discard changes is made</li>
  40  *       <li>Discard changes has to succeed</li>
  41  *       <li>If discard is successful, lock is reattempted</li>
  42  *       <li>Second lock attempt has to succeed</li>
  43  *     </ul>
  44  *   </li>
  45  *   <li>Edit-config in candidate N times
  46  *     <ul>
  47  *       <li>If any issue occurs during edit,
  48  *       datastore is discarded using discard-changes rpc, unlocked and an exception is thrown async</li>
  49  *     </ul>
  50  *   </li>
  51  *   <li>Commit and Unlock candidate datastore async</li>
  52  * </ol>
  53  */
  54 public class WriteCandidateTx extends AbstractWriteTx {
  55
  56     private static final Logger LOG  = LoggerFactory.getLogger(WriteCandidateTx.class);
  57
  58     public WriteCandidateTx(final RemoteDeviceId id, final NetconfBaseOps rpc, final boolean rollbackSupport) {
  59         super(rpc, id, rollbackSupport);
  60     }
  61
  62     @Override
  63     protected synchronized void init() {
  64         LOG.trace("{}: Initializing {} transaction", id, getClass().getSimpleName());
  65         lock();
  66     }
  67
  68     private void lock() {
  69         final FutureCallback<DOMRpcResult> lockCandidateCallback = new FutureCallback<DOMRpcResult>() {
  70             @Override
  71             public void onSuccess(final DOMRpcResult result) {
  72                 if (isSuccess(result)) {
  73                     if (LOG.isTraceEnabled()) {
  74                         LOG.trace("Lock candidate successful");
  75                     }
  76                 } else {
  77                     LOG.warn("{}: lock candidate invoked unsuccessfully: {}", id, result.getErrors());
  78                 }
  79             }
  80
  81             @Override
  82             public void onFailure(final Throwable throwable) {
  83                 LOG.warn("Lock candidate operation failed. {}", throwable);
  84                 discardChanges();
  85             }
  86         };
  87         resultsFutures.add(netOps.lockCandidate(lockCandidateCallback));
  88     }
  89
  90     @Override
  91     protected void cleanup() {
  92         discardChanges();
  93         cleanupOnSuccess();
  94     }
  95
  96     @Override
  97     public synchronized CheckedFuture<Void, TransactionCommitFailedException> submit() {
  98         final ListenableFuture<Void> commitFutureAsVoid = Futures.transform(commit(),
  99             (Function<RpcResult<TransactionStatus>, Void>) input -> {
 100                 Preconditions.checkArgument(input.isSuccessful() && input.getErrors().isEmpty(),
 101                         "Submit failed with errors: %s", input.getErrors());
 102                 return null;
 103             });
 104
 105         return Futures.makeChecked(commitFutureAsVoid, input -> new TransactionCommitFailedException(
 106                 "Submit of transaction " + getIdentifier() + " failed", input));
 107     }
 108
 109     /**
 110      * This has to be non blocking since it is called from a callback on commit
 111      * and its netty threadpool that is really sensitive to blocking calls.
 112      */
 113     private void discardChanges() {
 114         netOps.discardChanges(new NetconfRpcFutureCallback("Discarding candidate", id));
 115     }
 116
 117     @Override
 118     public synchronized ListenableFuture<RpcResult<TransactionStatus>> performCommit() {
 119         resultsFutures.add(netOps.commit(new NetconfRpcFutureCallback("Commit", id)));
 120         final ListenableFuture<RpcResult<TransactionStatus>> txResult = resultsToTxStatus();
 121
 122         Futures.addCallback(txResult, new FutureCallback<RpcResult<TransactionStatus>>() {
 123             @Override
 124             public void onSuccess(@Nullable final RpcResult<TransactionStatus> result) {
 125                 cleanupOnSuccess();
 126             }
 127
 128             @Override
 129             public void onFailure(final Throwable throwable) {
 130                 // TODO If lock is cause of this failure cleanup will issue warning log
 131                 // cleanup is trying to do unlock, but this will fail
 132                 cleanup();
 133             }
 134         });
 135
 136         return txResult;
 137     }
 138
 139     protected void cleanupOnSuccess() {
 140         unlock();
 141     }
 142
 143     @Override
 144     protected void editConfig(final YangInstanceIdentifier path,
 145                               final Optional<NormalizedNode<?, ?>> data,
 146                               final DataContainerChild<?, ?> editStructure,
 147                               final Optional<ModifyAction> defaultOperation,
 148                               final String operation) {
 149
 150         final NetconfRpcFutureCallback editConfigCallback = new NetconfRpcFutureCallback("Edit candidate", id);
 151
 152         if (defaultOperation.isPresent()) {
 153             resultsFutures.add(netOps.editConfigCandidate(
 154                     editConfigCallback, editStructure, defaultOperation.get(), rollbackSupport));
 155         } else {
 156             resultsFutures.add(netOps.editConfigCandidate(editConfigCallback, editStructure, rollbackSupport));
 157         }
 158     }
 159
 160     /**
 161      * This has to be non blocking since it is called from a callback on commit
 162      * and its netty threadpool that is really sensitive to blocking calls.
 163      */
 164     private void unlock() {
 165         netOps.unlockCandidate(new NetconfRpcFutureCallback("Unlock candidate", id));
 166     }
 167
 168 }