dom/mdsal-dom-broker/src/main/java/org/opendaylight/mdsal/dom/broker/ShardedDOMDataTreeWriteTransaction.java

   1 /*
   2  * Copyright (c) 2015 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.mdsal.dom.broker;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.collect.ImmutableMap;
  12 import com.google.common.util.concurrent.CheckedFuture;
  13 import com.google.common.util.concurrent.FutureCallback;
  14 import com.google.common.util.concurrent.Futures;
  15 import com.google.common.util.concurrent.ListenableFuture;
  16 import com.google.common.util.concurrent.SettableFuture;
  17 import java.util.ArrayDeque;
  18 import java.util.Deque;
  19 import java.util.List;
  20 import java.util.Map;
  21 import java.util.Map.Entry;
  22 import java.util.concurrent.atomic.AtomicLong;
  23 import java.util.function.BiConsumer;
  24 import java.util.function.Consumer;
  25 import java.util.stream.Collectors;
  26 import javax.annotation.Nonnull;
  27 import javax.annotation.concurrent.GuardedBy;
  28 import javax.annotation.concurrent.NotThreadSafe;
  29 import org.opendaylight.mdsal.common.api.TransactionCommitFailedException;
  30 import org.opendaylight.mdsal.dom.api.DOMDataTreeCursorAwareTransaction;
  31 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  32 import org.opendaylight.mdsal.dom.api.DOMDataTreeWriteCursor;
  33 import org.opendaylight.mdsal.dom.store.inmemory.DOMDataTreeShardWriteTransaction;
  34 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  35 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  36 import org.slf4j.Logger;
  37 import org.slf4j.LoggerFactory;
  38
  39 @NotThreadSafe
  40 final class ShardedDOMDataTreeWriteTransaction implements DOMDataTreeCursorAwareTransaction {
  41     private static final Logger LOG = LoggerFactory.getLogger(ShardedDOMDataTreeWriteTransaction.class);
  42     private static final TransactionCommitFailedExceptionMapper SUBMIT_FAILED_MAPPER =
  43             TransactionCommitFailedExceptionMapper.create("submit");
  44     private static final AtomicLong COUNTER = new AtomicLong();
  45
  46     private final Map<DOMDataTreeIdentifier, DOMDataTreeShardWriteTransaction> transactions;
  47     private final ShardedDOMDataTreeProducer producer;
  48     private final ProducerLayout layout;
  49     private final String identifier;
  50
  51     private final SettableFuture<Void> future = SettableFuture.create();
  52     private final CheckedFuture<Void, TransactionCommitFailedException> submitFuture =
  53             Futures.makeChecked(future, SUBMIT_FAILED_MAPPER);
  54
  55     @GuardedBy("this")
  56     private boolean closed =  false;
  57
  58     @GuardedBy("this")
  59     private DOMDataTreeWriteCursor openCursor;
  60
  61     ShardedDOMDataTreeWriteTransaction(final ShardedDOMDataTreeProducer producer,
  62         final Map<DOMDataTreeIdentifier, DOMDataTreeShardWriteTransaction> transactions, final ProducerLayout layout) {
  63         this.producer = Preconditions.checkNotNull(producer);
  64         this.transactions = ImmutableMap.copyOf(transactions);
  65         this.layout = Preconditions.checkNotNull(layout);
  66         this.identifier = "SHARDED-DOM-" + COUNTER.getAndIncrement();
  67         LOG.debug("Created new transaction {}", identifier);
  68     }
  69
  70     private DOMDataTreeShardWriteTransaction lookup(final DOMDataTreeIdentifier prefix) {
  71         for (final Entry<DOMDataTreeIdentifier, DOMDataTreeShardWriteTransaction> e : transactions.entrySet()) {
  72             if (e.getKey().contains(prefix)) {
  73                 Preconditions.checkArgument(!producer.isDelegatedToChild(prefix),
  74                     "Path %s is delegated to child producer.", prefix);
  75                 return e.getValue();
  76             }
  77         }
  78
  79         throw new IllegalArgumentException(String.format("Path %s is not accessible from transaction %s",
  80                 prefix, this));
  81     }
  82
  83     @Override
  84     public String getIdentifier() {
  85         return identifier;
  86     }
  87
  88     @Override
  89     public synchronized boolean cancel() {
  90         if (closed) {
  91             return false;
  92         }
  93
  94         LOG.debug("Cancelling transaction {}", identifier);
  95         if (openCursor != null) {
  96             openCursor.close();
  97         }
  98         for (final DOMDataTreeShardWriteTransaction tx : transactions.values()) {
  99             tx.close();
 100         }
 101
 102         closed = true;
 103         producer.cancelTransaction(this);
 104         return true;
 105     }
 106
 107     @Override
 108     public synchronized DOMDataTreeWriteCursor createCursor(final DOMDataTreeIdentifier prefix) {
 109         Preconditions.checkState(!closed, "Transaction is closed already");
 110         Preconditions.checkState(openCursor == null, "There is still a cursor open");
 111         final DOMDataTreeShardWriteTransaction lookup = lookup(prefix);
 112         openCursor = new DelegatingCursor(lookup.createCursor(prefix), prefix);
 113         return openCursor;
 114     }
 115
 116     @Override
 117     public synchronized CheckedFuture<Void, TransactionCommitFailedException> submit() {
 118         Preconditions.checkState(!closed, "Transaction %s is already closed", identifier);
 119         Preconditions.checkState(openCursor == null, "Cannot submit transaction while there is a cursor open");
 120
 121         producer.transactionSubmitted(this);
 122         return submitFuture;
 123     }
 124
 125     void doSubmit(final Consumer<ShardedDOMDataTreeWriteTransaction> success,
 126             final BiConsumer<ShardedDOMDataTreeWriteTransaction, Throwable> failure) {
 127
 128         final ListenableFuture<List<Void>> listListenableFuture = Futures.allAsList(
 129             transactions.values().stream().map(tx -> {
 130                 LOG.debug("Readying tx {}", identifier);
 131                 tx.ready();
 132                 return tx.submit();
 133             }).collect(Collectors.toList()));
 134
 135         Futures.addCallback(listListenableFuture, new FutureCallback<List<Void>>() {
 136             @Override
 137             public void onSuccess(final List<Void> result) {
 138                 success.accept(ShardedDOMDataTreeWriteTransaction.this);
 139             }
 140
 141             @Override
 142             public void onFailure(final Throwable exp) {
 143                 failure.accept(ShardedDOMDataTreeWriteTransaction.this, exp);
 144             }
 145         });
 146     }
 147
 148     void onTransactionSuccess(final Void result) {
 149         future.set(result);
 150     }
 151
 152     void onTransactionFailure(final Throwable throwable) {
 153         future.setException(throwable);
 154     }
 155
 156     synchronized void cursorClosed() {
 157         openCursor = null;
 158     }
 159
 160     private class DelegatingCursor implements DOMDataTreeWriteCursor {
 161         private final Deque<PathArgument> path = new ArrayDeque<>();
 162         private final DOMDataTreeWriteCursor delegate;
 163         private final DOMDataTreeIdentifier rootPosition;
 164
 165         DelegatingCursor(final DOMDataTreeWriteCursor delegate, final DOMDataTreeIdentifier rootPosition) {
 166             this.delegate = Preconditions.checkNotNull(delegate);
 167             this.rootPosition = Preconditions.checkNotNull(rootPosition);
 168             path.addAll(rootPosition.getRootIdentifier().getPathArguments());
 169         }
 170
 171         @Override
 172         public void enter(@Nonnull final PathArgument child) {
 173             checkAvailable(child);
 174             path.push(child);
 175             delegate.enter(child);
 176         }
 177
 178         @Override
 179         public void enter(@Nonnull final PathArgument... path) {
 180             for (final PathArgument pathArgument : path) {
 181                 enter(pathArgument);
 182             }
 183         }
 184
 185         @Override
 186         public void enter(@Nonnull final Iterable<PathArgument> path) {
 187             for (final PathArgument pathArgument : path) {
 188                 enter(pathArgument);
 189             }
 190         }
 191
 192         @Override
 193         public void exit() {
 194             path.pop();
 195             delegate.exit();
 196         }
 197
 198         @Override
 199         public void exit(final int depth) {
 200             for (int i = 0; i < depth; i++) {
 201                 path.pop();
 202             }
 203             delegate.exit(depth);
 204         }
 205
 206         @Override
 207         public void close() {
 208             int depthEntered = path.size() - rootPosition.getRootIdentifier().getPathArguments().size();
 209             if (depthEntered > 0) {
 210                 // clean up existing modification cursor in case this tx will be reused for batching
 211                 delegate.exit(depthEntered);
 212             }
 213
 214             delegate.close();
 215             cursorClosed();
 216         }
 217
 218         @Override
 219         public void delete(final PathArgument child) {
 220             checkAvailable(child);
 221             delegate.delete(child);
 222         }
 223
 224         @Override
 225         public void merge(final PathArgument child, final NormalizedNode<?, ?> data) {
 226             checkAvailable(child);
 227             delegate.merge(child, data);
 228         }
 229
 230         @Override
 231         public void write(final PathArgument child, final NormalizedNode<?, ?> data) {
 232             checkAvailable(child);
 233             delegate.write(child, data);
 234         }
 235
 236         void checkAvailable(final PathArgument child) {
 237             layout.checkAvailable(path, child);
 238         }
 239     }
 240
 241     ProducerLayout getLayout() {
 242         return layout;
 243     }
 244 }