Implemented a PartitionManager to keep track of partitions
assigned to instances.
Also updated GossipIntentStore a little to the new API. This work is not
yet complete.
Change-Id: I64d1779b669de51c35da686b65006a80ac4819b0
diff --git a/core/store/dist/src/main/java/org/onosproject/store/intent/impl/PartitionManager.java b/core/store/dist/src/main/java/org/onosproject/store/intent/impl/PartitionManager.java
new file mode 100644
index 0000000..eb831c5
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/intent/impl/PartitionManager.java
@@ -0,0 +1,121 @@
+/*
+ * Copyright 2015 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.intent.impl;
+
+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.Leadership;
+import org.onosproject.cluster.LeadershipEvent;
+import org.onosproject.cluster.LeadershipEventListener;
+import org.onosproject.cluster.LeadershipService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Collections;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Manages the assignment of intent keyspace partitions to instances.
+ */
+@Component(immediate = true)
+@Service
+public class PartitionManager implements PartitionService {
+
+ private static final Logger log = LoggerFactory.getLogger(PartitionManager.class);
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected LeadershipService leadershipService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected ClusterService clusterService;
+
+ // TODO make configurable
+ private static final int NUM_PARTITIONS = 100;
+
+ private static final String ELECTION_PREFIX = "intent-partition-";
+
+ private LeadershipEventListener leaderListener = new InternalLeadershipListener();
+
+ private Set<PartitionId> myPartitions;
+
+ @Activate
+ public void activate() {
+ myPartitions = Collections.newSetFromMap(new ConcurrentHashMap<>());
+
+ leadershipService.addListener(leaderListener);
+
+ for (int i = 0; i < NUM_PARTITIONS; i++) {
+ leadershipService.runForLeadership(ELECTION_PREFIX + i);
+ }
+ }
+
+ @Deactivate
+ public void deactivate() {
+ leadershipService.removeListener(leaderListener);
+ }
+
+ private PartitionId getPartitionForKey(String intentKey) {
+ return new PartitionId(intentKey.hashCode() % NUM_PARTITIONS);
+ }
+
+ @Override
+ public boolean isMine(String intentKey) {
+ return checkNotNull(
+ myPartitions.contains(getPartitionForKey(intentKey)));
+ }
+
+ private final class InternalLeadershipListener implements LeadershipEventListener {
+
+ @Override
+ public void event(LeadershipEvent event) {
+ Leadership leadership = event.subject();
+ // update internal state about which partitions I'm leader of
+ if (leadership.leader().equals(clusterService.getLocalNode().id()) &&
+ leadership.topic().startsWith(ELECTION_PREFIX)) {
+
+ // Parse out the partition ID
+ String[] splitted = leadership.topic().split("-");
+ if (splitted.length != 3) {
+ log.warn("Couldn't parse leader election topic {}", leadership.topic());
+ return;
+ }
+
+ int partitionId;
+ try {
+ partitionId = Integer.parseInt(splitted[2]);
+ } catch (NumberFormatException e) {
+ log.warn("Couldn't parse partition ID {}", splitted[2]);
+ return;
+ }
+
+ if (event.type() == LeadershipEvent.Type.LEADER_ELECTED) {
+ myPartitions.add(new PartitionId(partitionId));
+ } else if (event.type() == LeadershipEvent.Type.LEADER_BOOTED) {
+ myPartitions.remove(new PartitionId(partitionId));
+ }
+ }
+
+ }
+ }
+}