+/*
+ * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.md.sal.dom.broker.impl;
+
+import com.google.common.base.Preconditions;
+import com.google.common.collect.BiMap;
+import com.google.common.collect.ImmutableBiMap;
+import com.google.common.collect.ImmutableBiMap.Builder;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Queue;
+import java.util.Set;
+import javax.annotation.concurrent.GuardedBy;
+import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeIdentifier;
+import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeProducer;
+import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeProducerBusyException;
+import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeProducerException;
+import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeShard;
+import org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction;
+import org.opendaylight.controller.sal.core.spi.data.DOMStore;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreTransactionChain;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreWriteTransaction;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+final class ShardedDOMDataTreeProducer implements DOMDataTreeProducer {
+ private static final Logger LOG = LoggerFactory.getLogger(ShardedDOMDataTreeProducer.class);
+ private final BiMap<DOMDataTreeShard, DOMStoreTransactionChain> shardToChain;
+ private final Map<DOMDataTreeIdentifier, DOMDataTreeShard> idToShard;
+ private final ShardedDOMDataTree dataTree;
+
+ @GuardedBy("this")
+ private Map<DOMDataTreeIdentifier, DOMDataTreeProducer> children = Collections.emptyMap();
+ @GuardedBy("this")
+ private DOMDataWriteTransaction openTx;
+ @GuardedBy("this")
+ private boolean closed;
+
+ ShardedDOMDataTreeProducer(final ShardedDOMDataTree dataTree, final Map<DOMDataTreeIdentifier, DOMDataTreeShard> shardMap, final Set<DOMDataTreeShard> shards) {
+ this.dataTree = Preconditions.checkNotNull(dataTree);
+
+ // Create shard -> chain map
+ final Builder<DOMDataTreeShard, DOMStoreTransactionChain> cb = ImmutableBiMap.builder();
+ final Queue<Exception> es = new LinkedList<>();
+
+ for (DOMDataTreeShard s : shards) {
+ if (s instanceof DOMStore) {
+ try {
+ final DOMStoreTransactionChain c = ((DOMStore)s).createTransactionChain();
+ LOG.trace("Using DOMStore chain {} to access shard {}", c, s);
+ cb.put(s, c);
+ } catch (Exception e) {
+ LOG.error("Failed to instantiate chain for shard {}", s, e);
+ es.add(e);
+ }
+ } else {
+ LOG.error("Unhandled shard instance type {}", s.getClass());
+ }
+ }
+ this.shardToChain = cb.build();
+
+ // An error was encountered, close chains and report the error
+ if (shardToChain.size() != shards.size()) {
+ for (DOMStoreTransactionChain c : shardToChain.values()) {
+ try {
+ c.close();
+ } catch (Exception e) {
+ LOG.warn("Exception raised while closing chain %s", c, e);
+ }
+ }
+
+ final IllegalStateException e = new IllegalStateException("Failed to completely allocate contexts", es.poll());
+ while (!es.isEmpty()) {
+ e.addSuppressed(es.poll());
+ }
+
+ throw e;
+ }
+
+ idToShard = ImmutableMap.copyOf(shardMap);
+ }
+
+ @Override
+ public synchronized DOMDataWriteTransaction createTransaction(final boolean isolated) {
+ Preconditions.checkState(!closed, "Producer is already closed");
+ Preconditions.checkState(openTx == null, "Transaction %s is still open", openTx);
+
+ // Allocate backing transactions
+ final Map<DOMDataTreeShard, DOMStoreWriteTransaction> shardToTx = new HashMap<>();
+ for (Entry<DOMDataTreeShard, DOMStoreTransactionChain> e : shardToChain.entrySet()) {
+ shardToTx.put(e.getKey(), e.getValue().newWriteOnlyTransaction());
+ }
+
+ // Create the ID->transaction map
+ final ImmutableMap.Builder<DOMDataTreeIdentifier, DOMStoreWriteTransaction> b = ImmutableMap.builder();
+ for (Entry<DOMDataTreeIdentifier, DOMDataTreeShard> e : idToShard.entrySet()) {
+ b.put(e.getKey(), shardToTx.get(e.getValue()));
+ }
+
+ final ShardedDOMDataWriteTransaction ret = new ShardedDOMDataWriteTransaction(this, b.build());
+ openTx = ret;
+ return ret;
+ }
+
+ @GuardedBy("this")
+ private boolean haveSubtree(final DOMDataTreeIdentifier subtree) {
+ for (DOMDataTreeIdentifier i : idToShard.keySet()) {
+ if (i.contains(subtree)) {
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ @GuardedBy("this")
+ private DOMDataTreeProducer lookupChild(final DOMDataTreeIdentifier s) {
+ for (Entry<DOMDataTreeIdentifier, DOMDataTreeProducer> e : children.entrySet()) {
+ if (e.getKey().contains(s)) {
+ return e.getValue();
+ }
+ }
+
+ return null;
+ }
+
+ @Override
+ public synchronized DOMDataTreeProducer createProducer(final Collection<DOMDataTreeIdentifier> subtrees) {
+ Preconditions.checkState(!closed, "Producer is already closed");
+ Preconditions.checkState(openTx == null, "Transaction %s is still open", openTx);
+
+ for (DOMDataTreeIdentifier s : subtrees) {
+ // Check if the subtree was visible at any time
+ if (!haveSubtree(s)) {
+ throw new IllegalArgumentException(String.format("Subtree %s was never available in producer %s", s, this));
+ }
+
+ // Check if the subtree has not been delegated to a child
+ final DOMDataTreeProducer child = lookupChild(s);
+ Preconditions.checkArgument(child == null, "Subtree %s is delegated to child producer %s", s, child);
+
+ // Check if part of the requested subtree is not delegated to a child.
+ for (DOMDataTreeIdentifier c : children.keySet()) {
+ if (s.contains(c)) {
+ throw new IllegalArgumentException(String.format("Subtree %s cannot be delegated as it is superset of already-delegated %s", s, c));
+ }
+ }
+ }
+
+ final DOMDataTreeProducer ret = dataTree.createProducer(this, subtrees);
+ final ImmutableMap.Builder<DOMDataTreeIdentifier, DOMDataTreeProducer> cb = ImmutableMap.builder();
+ cb.putAll(children);
+ for (DOMDataTreeIdentifier s : subtrees) {
+ cb.put(s, ret);
+ }
+
+ children = cb.build();
+ return ret;
+ }
+
+ @Override
+ public synchronized void close() throws DOMDataTreeProducerException {
+ if (!closed) {
+ if (openTx != null) {
+ throw new DOMDataTreeProducerBusyException(String.format("Transaction %s is still open", openTx));
+ }
+
+ closed = true;
+ dataTree.destroyProducer(this);
+ }
+ }
+
+ static DOMDataTreeProducer create(final ShardedDOMDataTree dataTree, final Map<DOMDataTreeIdentifier, DOMDataTreeShard> shardMap) {
+ /*
+ * FIXME: we do not allow multiple multiple shards in a producer because we do not implement the
+ * synchronization primitives yet
+ */
+ final Set<DOMDataTreeShard> shards = ImmutableSet.copyOf(shardMap.values());
+ if (shards.size() > 1) {
+ throw new UnsupportedOperationException("Cross-shard producers are not supported yet");
+ }
+
+ return new ShardedDOMDataTreeProducer(dataTree, shardMap, shards);
+ }
+
+ Set<DOMDataTreeIdentifier> getSubtrees() {
+ return idToShard.keySet();
+ }
+
+ synchronized void cancelTransaction(final ShardedDOMDataWriteTransaction transaction) {
+ if (!openTx.equals(transaction)) {
+ LOG.warn("Transaction {} is not open in producer {}", transaction, this);
+ return;
+ }
+
+ LOG.debug("Transaction {} cancelled", transaction);
+ openTx = null;
+ }
+}
Code Review / controller.git / commitdiff