StorageManager with associated new primitive builders
Change-Id: Ic5d7048cda5ea5e7e86df2d2390c16eea850cd83
diff --git a/core/store/dist/src/main/java/org/onosproject/store/cluster/impl/NewDistributedLeadershipStore.java b/core/store/dist/src/main/java/org/onosproject/store/cluster/impl/NewDistributedLeadershipStore.java
new file mode 100644
index 0000000..ad1d0a2
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/cluster/impl/NewDistributedLeadershipStore.java
@@ -0,0 +1,155 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.store.cluster.impl;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.Map;
+import java.util.Objects;
+import java.util.function.Consumer;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.util.Tools;
+import org.onosproject.cluster.ClusterService;
+import org.onosproject.cluster.Leadership;
+import org.onosproject.cluster.LeadershipEvent;
+import org.onosproject.cluster.LeadershipStore;
+import org.onosproject.cluster.LeadershipStoreDelegate;
+import org.onosproject.cluster.NodeId;
+import org.onosproject.event.Change;
+import org.onosproject.store.AbstractStore;
+import org.onosproject.store.service.LeaderElector;
+import org.onosproject.store.service.StorageException;
+import org.onosproject.store.service.StorageService;
+import org.slf4j.Logger;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Maps;
+
+/**
+ * Implementation of {@code LeadershipStore} that makes use of a {@link LeaderElector}
+ * primitive.
+ */
+@Service
+@Component(immediate = true, enabled = false)
+public class NewDistributedLeadershipStore
+ extends AbstractStore<LeadershipEvent, LeadershipStoreDelegate>
+ implements LeadershipStore {
+
+ private final Logger log = getLogger(getClass());
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected ClusterService clusterService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected StorageService storageService;
+
+ private NodeId localNodeId;
+ private LeaderElector leaderElector;
+ private final Map<String, Leadership> leaderBoard = Maps.newConcurrentMap();
+
+ private static final int MAX_RETRIES = 10;
+ private static final int MAX_DELAY_MILLIS_BETWEEN_RETRIES = 100;
+
+ private final Consumer<Change<Leadership>> leadershipChangeListener =
+ change -> {
+ Leadership oldValue = change.oldValue();
+ Leadership newValue = change.newValue();
+ leaderBoard.put(newValue.topic(), newValue);
+ boolean leaderChanged = !Objects.equals(oldValue.leader(), newValue.leader());
+ boolean candidatesChanged = !Objects.equals(oldValue.candidates(), newValue.candidates());
+ LeadershipEvent.Type eventType = null;
+ if (leaderChanged && candidatesChanged) {
+ eventType = LeadershipEvent.Type.LEADER_AND_CANDIDATES_CHANGED;
+ }
+ if (leaderChanged && !candidatesChanged) {
+ eventType = LeadershipEvent.Type.LEADER_CHANGED;
+ }
+ if (!leaderChanged && candidatesChanged) {
+ eventType = LeadershipEvent.Type.CANDIDATES_CHANGED;
+ }
+ notifyDelegate(new LeadershipEvent(eventType, change.newValue()));
+ };
+
+ @Activate
+ public void activate() {
+ localNodeId = clusterService.getLocalNode().id();
+ leaderElector = storageService.leaderElectorBuilder()
+ .withName("onos-leadership-elections")
+ .build()
+ .asLeaderElector();
+ leaderElector.addChangeListener(leadershipChangeListener);
+ leaderBoard.putAll(getLeaderships());
+ log.info("Started");
+ }
+
+ @Deactivate
+ public void deactivate() {
+ leaderElector.removeChangeListener(leadershipChangeListener);
+ log.info("Stopped");
+ }
+
+ @Override
+ public Leadership addRegistration(String topic) {
+ return Tools.retryable(() -> leaderElector.run(topic, localNodeId),
+ StorageException.class,
+ MAX_RETRIES,
+ MAX_DELAY_MILLIS_BETWEEN_RETRIES).get();
+ }
+
+ @Override
+ public void removeRegistration(String topic) {
+ Tools.retryable(() -> {
+ leaderElector.withdraw(topic);
+ return null;
+ },
+ StorageException.class,
+ MAX_RETRIES,
+ MAX_DELAY_MILLIS_BETWEEN_RETRIES).get();
+ }
+
+ @Override
+ public void removeRegistration(NodeId nodeId) {
+ // TODO
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public boolean moveLeadership(String topic, NodeId toNodeId) {
+ return leaderElector.anoint(topic, toNodeId);
+ }
+
+ @Override
+ public boolean makeTopCandidate(String topic, NodeId nodeId) {
+ // TODO
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public Leadership getLeadership(String topic) {
+ return leaderBoard.get(topic);
+ }
+
+ @Override
+ public Map<String, Leadership> getLeaderships() {
+ return ImmutableMap.copyOf(leaderBoard);
+ }
+}
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/NewDefaultAtomicCounterBuilder.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/NewDefaultAtomicCounterBuilder.java
new file mode 100644
index 0000000..42ef659
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/NewDefaultAtomicCounterBuilder.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.store.primitives.impl;
+
+import org.onosproject.store.primitives.DistributedPrimitiveCreator;
+import org.onosproject.store.service.AsyncAtomicCounter;
+import org.onosproject.store.service.AtomicCounterBuilder;
+
+/**
+ * Default implementation of AtomicCounterBuilder.
+ */
+public class NewDefaultAtomicCounterBuilder extends AtomicCounterBuilder {
+
+ private final DistributedPrimitiveCreator base;
+ private final DistributedPrimitiveCreator federated;
+
+ public NewDefaultAtomicCounterBuilder(DistributedPrimitiveCreator base, DistributedPrimitiveCreator federated) {
+ this.base = base;
+ this.federated = federated;
+ }
+
+ @Override
+ public AsyncAtomicCounter build() {
+ DistributedPrimitiveCreator creator = partitionsDisabled() ? base : federated;
+ return creator.newAsyncCounter(name());
+ }
+}
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/NewDefaultConsistentMapBuilder.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/NewDefaultConsistentMapBuilder.java
new file mode 100644
index 0000000..50b3fea
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/NewDefaultConsistentMapBuilder.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.store.primitives.impl;
+
+import org.onosproject.store.primitives.DistributedPrimitiveCreator;
+import org.onosproject.store.service.AsyncConsistentMap;
+import org.onosproject.store.service.ConsistentMap;
+import org.onosproject.store.service.ConsistentMapBuilder;
+
+/**
+ * Default {@link AsyncConsistentMap} builder.
+ *
+ * @param <K> type for map key
+ * @param <V> type for map value
+ */
+public class NewDefaultConsistentMapBuilder<K, V> extends ConsistentMapBuilder<K, V> {
+
+ private final DistributedPrimitiveCreator base;
+ private final DistributedPrimitiveCreator federated;
+
+ public NewDefaultConsistentMapBuilder(DistributedPrimitiveCreator base, DistributedPrimitiveCreator federated) {
+ this.base = base;
+ this.federated = federated;
+ }
+
+ @Override
+ public ConsistentMap<K, V> build() {
+ return buildAsyncMap().asConsistentMap();
+ }
+
+ @Override
+ public AsyncConsistentMap<K, V> buildAsyncMap() {
+ DistributedPrimitiveCreator creator = partitionsDisabled() ? base : federated;
+ AsyncConsistentMap<K, V> map = creator.newAsyncConsistentMap(name(), serializer());
+ map = relaxedReadConsistency() ? DistributedPrimitives.newCachingMap(map) : map;
+ map = readOnly() ? DistributedPrimitives.newUnmodifiableMap(map) : map;
+ return meteringEnabled() ? DistributedPrimitives.newMeteredMap(map) : map;
+ }
+}
\ No newline at end of file
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/NewDefaultTransactionContext.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/NewDefaultTransactionContext.java
new file mode 100644
index 0000000..39d24cf
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/NewDefaultTransactionContext.java
@@ -0,0 +1,92 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.store.primitives.impl;
+
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.onosproject.store.primitives.DistributedPrimitiveCreator;
+import org.onosproject.store.primitives.TransactionId;
+import org.onosproject.store.service.Serializer;
+import org.onosproject.store.service.TransactionContext;
+import org.onosproject.store.service.TransactionalMap;
+
+import com.google.common.collect.Sets;
+
+/**
+ * Default implementation of transaction context.
+ */
+public class NewDefaultTransactionContext implements TransactionContext {
+
+ private final AtomicBoolean isOpen = new AtomicBoolean(false);
+ private final DistributedPrimitiveCreator creator;
+ private final TransactionId transactionId;
+ private final TransactionCoordinator transactionCoordinator;
+ private final Set<TransactionParticipant> txParticipants = Sets.newConcurrentHashSet();
+
+ public NewDefaultTransactionContext(TransactionId transactionId,
+ DistributedPrimitiveCreator creator,
+ TransactionCoordinator transactionCoordinator) {
+ this.transactionId = transactionId;
+ this.creator = creator;
+ this.transactionCoordinator = transactionCoordinator;
+ }
+
+ @Override
+ public String name() {
+ return transactionId.toString();
+ }
+
+ @Override
+ public TransactionId transactionId() {
+ return transactionId;
+ }
+
+ @Override
+ public boolean isOpen() {
+ return isOpen.get();
+ }
+
+ @Override
+ public void begin() {
+ if (!isOpen.compareAndSet(false, true)) {
+ throw new IllegalStateException("TransactionContext is already open");
+ }
+ }
+
+ @Override
+ public boolean commit() {
+ transactionCoordinator.commit(transactionId, txParticipants).getNow(null);
+ return true;
+ }
+
+ @Override
+ public void abort() {
+ isOpen.set(false);
+ }
+
+ @Override
+ public <K, V> TransactionalMap<K, V> getTransactionalMap(String mapName,
+ Serializer serializer) {
+ // FIXME: Do not create duplicates.
+ DefaultTransactionalMap<K, V> txMap = new DefaultTransactionalMap<K, V>(mapName,
+ creator.<K, V>newAsyncConsistentMap(mapName, serializer),
+ this,
+ serializer);
+ txParticipants.add(txMap);
+ return txMap;
+ }
+}
\ No newline at end of file
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/NewDefaultTransactionContextBuilder.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/NewDefaultTransactionContextBuilder.java
new file mode 100644
index 0000000..3a27122
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/NewDefaultTransactionContextBuilder.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.store.primitives.impl;
+
+import org.onosproject.store.primitives.DistributedPrimitiveCreator;
+import org.onosproject.store.primitives.TransactionId;
+import org.onosproject.store.service.TransactionContext;
+import org.onosproject.store.service.TransactionContextBuilder;
+/**
+ * Default Transaction Context Builder.
+ */
+public class NewDefaultTransactionContextBuilder extends TransactionContextBuilder {
+
+ private final TransactionId transactionId;
+ private final DistributedPrimitiveCreator base;
+ private final DistributedPrimitiveCreator federated;
+ private final TransactionCoordinator transactionCoordinator;
+
+ public NewDefaultTransactionContextBuilder(TransactionId transactionId,
+ DistributedPrimitiveCreator base,
+ DistributedPrimitiveCreator federated,
+ TransactionCoordinator transactionCoordinator) {
+ this.transactionId = transactionId;
+ this.base = base;
+ this.federated = federated;
+ this.transactionCoordinator = transactionCoordinator;
+ }
+
+ @Override
+ public TransactionContext build() {
+ return new NewDefaultTransactionContext(transactionId,
+ this.partitionsDisabled() ? base : federated,
+ transactionCoordinator);
+ }
+}
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/StorageManager.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/StorageManager.java
new file mode 100644
index 0000000..f1eb4ce
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/StorageManager.java
@@ -0,0 +1,220 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.store.primitives.impl;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
+
+import org.apache.commons.collections.ListUtils;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onosproject.cluster.ClusterService;
+import org.onosproject.cluster.PartitionId;
+import org.onosproject.persistence.PersistenceService;
+import org.onosproject.store.cluster.messaging.ClusterCommunicationService;
+import org.onosproject.store.primitives.DistributedPrimitiveCreator;
+import org.onosproject.store.primitives.MapUpdate;
+import org.onosproject.store.primitives.PartitionService;
+import org.onosproject.store.primitives.TransactionId;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.AsyncConsistentMap;
+import org.onosproject.store.service.AtomicCounterBuilder;
+import org.onosproject.store.service.AtomicValueBuilder;
+import org.onosproject.store.service.ConsistentMap;
+import org.onosproject.store.service.ConsistentMapBuilder;
+import org.onosproject.store.service.DistributedQueueBuilder;
+import org.onosproject.store.service.DistributedSetBuilder;
+import org.onosproject.store.service.EventuallyConsistentMapBuilder;
+import org.onosproject.store.service.LeaderElectorBuilder;
+import org.onosproject.store.service.MapInfo;
+import org.onosproject.store.service.PartitionInfo;
+import org.onosproject.store.service.Serializer;
+import org.onosproject.store.service.StorageAdminService;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.TransactionContextBuilder;
+import org.slf4j.Logger;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import com.google.common.util.concurrent.Futures;
+
+/**
+ * Implementation for {@code StorageService} and {@code StorageAdminService}.
+ */
+@Service
+@Component(immediate = true, enabled = false)
+public class StorageManager implements StorageService, StorageAdminService {
+
+ private final Logger log = getLogger(getClass());
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected ClusterService clusterService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected ClusterCommunicationService clusterCommunicator;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected PersistenceService persistenceService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected PartitionService partitionService;
+
+ private final Supplier<TransactionId> transactionIdGenerator =
+ () -> TransactionId.from(UUID.randomUUID().toString());
+ private DistributedPrimitiveCreator basePrimitiveCreator;
+ private DistributedPrimitiveCreator federatedPrimitiveCreator;
+ private AsyncConsistentMap<TransactionId, Transaction.State> transactions;
+ private TransactionCoordinator transactionCoordinator;
+
+ @Activate
+ public void actiavte() {
+ basePrimitiveCreator = partitionService.getDistributedPrimitiveCreator(PartitionId.from(0));
+ Map<PartitionId, DistributedPrimitiveCreator> partitionMap = Maps.newHashMap();
+ partitionService.getAllPartitionIds().stream()
+ .filter(id -> !id.equals(PartitionId.from(0)))
+ .forEach(id -> partitionMap.put(id, partitionService.getDistributedPrimitiveCreator(id)));
+ federatedPrimitiveCreator = new FederatedDistributedPrimitiveCreator(partitionMap);
+ transactions = this.<TransactionId, Transaction.State>consistentMapBuilder()
+ .withName("onos-transactions")
+ .withSerializer(Serializer.using(KryoNamespaces.API,
+ MapUpdate.class,
+ MapUpdate.Type.class,
+ Transaction.class,
+ Transaction.State.class))
+ .buildAsyncMap();
+ transactionCoordinator = new TransactionCoordinator(transactions);
+ log.info("Started");
+ }
+
+ @Deactivate
+ public void deactivate() {
+ log.info("Stopped");
+ }
+
+ @Override
+ public <K, V> EventuallyConsistentMapBuilder<K, V> eventuallyConsistentMapBuilder() {
+ return new EventuallyConsistentMapBuilderImpl<>(clusterService,
+ clusterCommunicator,
+ persistenceService);
+ }
+
+ @Override
+ public <K, V> ConsistentMapBuilder<K, V> consistentMapBuilder() {
+ return new NewDefaultConsistentMapBuilder<>(basePrimitiveCreator, federatedPrimitiveCreator);
+ }
+
+ @Override
+ public <E> DistributedSetBuilder<E> setBuilder() {
+ return new DefaultDistributedSetBuilder<>(() -> this.<E, Boolean>consistentMapBuilder());
+ }
+
+ @Override
+ public <E> DistributedQueueBuilder<E> queueBuilder() {
+ // TODO: implement
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public AtomicCounterBuilder atomicCounterBuilder() {
+ return new NewDefaultAtomicCounterBuilder(basePrimitiveCreator, federatedPrimitiveCreator);
+ }
+
+ @Override
+ public <V> AtomicValueBuilder<V> atomicValueBuilder() {
+ Supplier<ConsistentMapBuilder<String, byte[]>> mapBuilderSupplier =
+ () -> this.<String, byte[]>consistentMapBuilder()
+ .withName("onos-atomic-values")
+ .withMeteringDisabled()
+ .withSerializer(Serializer.using(KryoNamespaces.BASIC));
+ return new DefaultAtomicValueBuilder<>(mapBuilderSupplier);
+ }
+
+ @Override
+ public TransactionContextBuilder transactionContextBuilder() {
+ return new NewDefaultTransactionContextBuilder(transactionIdGenerator.get(),
+ basePrimitiveCreator,
+ federatedPrimitiveCreator,
+ transactionCoordinator);
+ }
+
+ @Override
+ public LeaderElectorBuilder leaderElectorBuilder() {
+ return new DefaultLeaderElectorBuilder(basePrimitiveCreator,
+ federatedPrimitiveCreator);
+ }
+
+ @Override
+ public List<MapInfo> getMapInfo() {
+ return ListUtils.union(listMapInfo(basePrimitiveCreator), listMapInfo(federatedPrimitiveCreator));
+ }
+
+ @Override
+ public Map<String, Long> getCounters() {
+ Map<String, Long> result = Maps.newHashMap();
+ result.putAll(getInMemoryDatabaseCounters());
+ result.putAll(getPartitionedDatabaseCounters());
+ return result;
+ }
+
+ @Override
+ public Map<String, Long> getInMemoryDatabaseCounters() {
+ return getCounters(basePrimitiveCreator);
+ }
+
+ @Override
+ public Map<String, Long> getPartitionedDatabaseCounters() {
+ return getCounters(federatedPrimitiveCreator);
+ }
+
+ public Map<String, Long> getCounters(DistributedPrimitiveCreator creator) {
+ Map<String, Long> counters = Maps.newConcurrentMap();
+ creator.getAsyncAtomicCounterNames()
+ .forEach(name -> counters.put(name, creator.newAsyncCounter(name).asAtomicCounter().get()));
+ return counters;
+ }
+
+ @Override
+ public List<PartitionInfo> getPartitionInfo() {
+ return Lists.newArrayList();
+ }
+
+ @Override
+ public Collection<TransactionId> getPendingTransactions() {
+ return Futures.getUnchecked(transactions.keySet());
+ }
+
+ private List<MapInfo> listMapInfo(DistributedPrimitiveCreator creator) {
+ Serializer serializer = Serializer.using(KryoNamespaces.BASIC);
+ return creator.getAsyncConsistentMapNames()
+ .stream()
+ .map(name -> {
+ ConsistentMap<String, byte[]> map =
+ creator.<String, byte[]>newAsyncConsistentMap(name, serializer)
+ .asConsistentMap();
+ return new MapInfo(name, map.size());
+ }).collect(Collectors.toList());
+ }
+}
\ No newline at end of file
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/TransactionCoordinator.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/TransactionCoordinator.java
new file mode 100644
index 0000000..cd2768f
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/TransactionCoordinator.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.store.primitives.impl;
+
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+
+import org.onlab.util.Tools;
+import org.onosproject.store.primitives.TransactionId;
+import org.onosproject.store.service.AsyncConsistentMap;
+
+/**
+ * Coordinator for a two-phase commit protocol.
+ */
+public class TransactionCoordinator {
+
+ private final AsyncConsistentMap<TransactionId, Transaction.State> transactions;
+
+ public TransactionCoordinator(AsyncConsistentMap<TransactionId, Transaction.State> transactions) {
+ this.transactions = transactions;
+ }
+
+ /**
+ * Commits a transaction.
+ * @param transactionId transaction
+ * @return future for commit result
+ */
+ CompletableFuture<Void> commit(TransactionId transactionId, Set<TransactionParticipant> transactionParticipants) {
+ if (!transactionParticipants.stream().anyMatch(t -> t.hasPendingUpdates())) {
+ return CompletableFuture.completedFuture(null);
+ }
+
+ return transactions.put(transactionId, Transaction.State.PREPARING)
+ .thenCompose(v -> this.doPrepare(transactionParticipants))
+ .thenCompose(result -> result
+ ? transactions.put(transactionId, Transaction.State.COMMITTING)
+ .thenCompose(v -> doCommit(transactionParticipants))
+ .thenApply(v -> null)
+ : transactions.put(transactionId, Transaction.State.ROLLINGBACK)
+ .thenCompose(v -> doRollback(transactionParticipants))
+ .thenApply(v -> null))
+ .thenCompose(v -> transactions.remove(transactionId).thenApply(u -> null))
+ .thenApply(v -> null);
+ }
+
+ private CompletableFuture<Boolean> doPrepare(Set<TransactionParticipant> transactionParticipants) {
+ return Tools.allOf(transactionParticipants
+ .stream()
+ .map(TransactionParticipant::prepare)
+ .collect(Collectors.toList()))
+ .thenApply(list -> list.stream().reduce(Boolean::logicalAnd).orElse(true));
+ }
+
+ private CompletableFuture<Void> doCommit(Set<TransactionParticipant> transactionParticipants) {
+ return CompletableFuture.allOf(transactionParticipants.stream()
+ .map(p -> p.commit())
+ .toArray(CompletableFuture[]::new));
+ }
+
+ private CompletableFuture<Void> doRollback(Set<TransactionParticipant> transactionParticipants) {
+ return CompletableFuture.allOf(transactionParticipants.stream()
+ .map(p -> p.rollback())
+ .toArray(CompletableFuture[]::new));
+ }
+}
\ No newline at end of file