Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 1 | package org.onlab.onos.store.service.impl; |
| 2 | |
| 3 | import static org.slf4j.LoggerFactory.getLogger; |
| 4 | |
| 5 | import java.util.Iterator; |
| 6 | import java.util.List; |
| 7 | import java.util.concurrent.CompletableFuture; |
| 8 | |
| 9 | import org.apache.felix.scr.annotations.Activate; |
| 10 | import org.apache.felix.scr.annotations.Component; |
| 11 | import org.apache.felix.scr.annotations.Deactivate; |
| 12 | import org.apache.felix.scr.annotations.Reference; |
| 13 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
| 14 | import org.apache.felix.scr.annotations.Service; |
| 15 | import org.joda.time.DateTime; |
| 16 | import org.onlab.onos.cluster.ClusterService; |
| 17 | import org.onlab.onos.store.cluster.messaging.ClusterCommunicationService; |
| 18 | import org.onlab.onos.store.cluster.messaging.ClusterMessage; |
| 19 | import org.onlab.onos.store.cluster.messaging.ClusterMessageHandler; |
| 20 | import org.onlab.onos.store.service.DatabaseService; |
| 21 | import org.onlab.onos.store.service.Lock; |
| 22 | import org.onlab.onos.store.service.LockEventListener; |
| 23 | import org.onlab.onos.store.service.LockService; |
| 24 | import org.slf4j.Logger; |
| 25 | |
| 26 | import com.google.common.collect.ArrayListMultimap; |
| 27 | |
| 28 | @Component(immediate = true) |
| 29 | @Service |
| 30 | public class DistributedLockManager implements LockService { |
| 31 | |
| 32 | private final Logger log = getLogger(getClass()); |
| 33 | |
| 34 | public static final String ONOS_LOCK_TABLE_NAME = "onos-locks"; |
| 35 | |
Madan Jampani | 9b37d57 | 2014-11-12 11:53:24 -0800 | [diff] [blame] | 36 | private final ArrayListMultimap<String, LockRequest> locksToAcquire = ArrayListMultimap |
| 37 | .create(); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 38 | |
| 39 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 40 | private ClusterCommunicationService clusterCommunicator; |
| 41 | |
| 42 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 43 | private DatabaseService databaseService; |
| 44 | |
| 45 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 46 | private ClusterService clusterService; |
| 47 | |
| 48 | @Activate |
| 49 | public void activate() { |
| 50 | clusterCommunicator.addSubscriber( |
| 51 | DatabaseStateMachine.DATABASE_UPDATE_EVENTS, |
| 52 | new LockEventMessageListener()); |
| 53 | log.info("Started."); |
| 54 | |
| 55 | } |
| 56 | |
| 57 | @Deactivate |
| 58 | public void deactivate() { |
| 59 | locksToAcquire.clear(); |
| 60 | log.info("Started."); |
| 61 | } |
| 62 | |
| 63 | @Override |
| 64 | public Lock create(String path) { |
Madan Jampani | 9b37d57 | 2014-11-12 11:53:24 -0800 | [diff] [blame] | 65 | return new DistributedLock(path, databaseService, clusterService, this); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 66 | } |
| 67 | |
| 68 | @Override |
| 69 | public void addListener(LockEventListener listener) { |
| 70 | // FIXME: |
| 71 | throw new UnsupportedOperationException(); |
| 72 | } |
| 73 | |
| 74 | @Override |
| 75 | public void removeListener(LockEventListener listener) { |
| 76 | // FIXME: |
| 77 | throw new UnsupportedOperationException(); |
| 78 | } |
| 79 | |
Madan Jampani | 9b37d57 | 2014-11-12 11:53:24 -0800 | [diff] [blame] | 80 | protected CompletableFuture<Void> lockIfAvailable(Lock lock, |
| 81 | long waitTimeMillis, int leaseDurationMillis) { |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 82 | CompletableFuture<Void> future = new CompletableFuture<>(); |
Madan Jampani | 9b37d57 | 2014-11-12 11:53:24 -0800 | [diff] [blame] | 83 | locksToAcquire.put(lock.path(), new LockRequest(lock, waitTimeMillis, |
| 84 | leaseDurationMillis, future)); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 85 | return future; |
| 86 | } |
| 87 | |
| 88 | private class LockEventMessageListener implements ClusterMessageHandler { |
| 89 | @Override |
| 90 | public void handle(ClusterMessage message) { |
Madan Jampani | 9b37d57 | 2014-11-12 11:53:24 -0800 | [diff] [blame] | 91 | TableModificationEvent event = DatabaseStateMachine.SERIALIZER |
| 92 | .decode(message.payload()); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 93 | if (!event.tableName().equals(ONOS_LOCK_TABLE_NAME)) { |
| 94 | return; |
| 95 | } |
| 96 | |
| 97 | String path = event.key(); |
| 98 | if (!locksToAcquire.containsKey(path)) { |
| 99 | return; |
| 100 | } |
| 101 | |
| 102 | if (event.type() == TableModificationEvent.Type.ROW_DELETED) { |
| 103 | List<LockRequest> existingRequests = locksToAcquire.get(path); |
Madan Jampani | 44e6a54 | 2014-11-12 01:06:51 -0800 | [diff] [blame] | 104 | if (existingRequests == null) { |
| 105 | return; |
| 106 | } |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 107 | |
Madan Jampani | 9b37d57 | 2014-11-12 11:53:24 -0800 | [diff] [blame] | 108 | synchronized (existingRequests) { |
| 109 | |
| 110 | Iterator<LockRequest> existingRequestIterator = existingRequests |
| 111 | .iterator(); |
| 112 | while (existingRequestIterator.hasNext()) { |
| 113 | LockRequest request = existingRequestIterator.next(); |
| 114 | if (request.expirationTime().isAfter(DateTime.now())) { |
| 115 | existingRequestIterator.remove(); |
| 116 | } else { |
| 117 | if (request.lock().tryLock( |
| 118 | request.leaseDurationMillis())) { |
| 119 | request.future().complete(null); |
| 120 | existingRequestIterator.remove(); |
| 121 | } |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 122 | } |
| 123 | } |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | private class LockRequest { |
| 130 | |
| 131 | private final Lock lock; |
| 132 | private final DateTime expirationTime; |
| 133 | private final int leaseDurationMillis; |
| 134 | private final CompletableFuture<Void> future; |
| 135 | |
Madan Jampani | 9b37d57 | 2014-11-12 11:53:24 -0800 | [diff] [blame] | 136 | public LockRequest(Lock lock, long waitTimeMillis, |
| 137 | int leaseDurationMillis, CompletableFuture<Void> future) { |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 138 | |
| 139 | this.lock = lock; |
Madan Jampani | 9b37d57 | 2014-11-12 11:53:24 -0800 | [diff] [blame] | 140 | this.expirationTime = DateTime.now().plusMillis( |
| 141 | (int) waitTimeMillis); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 142 | this.leaseDurationMillis = leaseDurationMillis; |
| 143 | this.future = future; |
| 144 | } |
| 145 | |
| 146 | public Lock lock() { |
| 147 | return lock; |
| 148 | } |
| 149 | |
| 150 | public DateTime expirationTime() { |
| 151 | return expirationTime; |
| 152 | } |
| 153 | |
| 154 | public int leaseDurationMillis() { |
| 155 | return leaseDurationMillis; |
| 156 | } |
| 157 | |
| 158 | public CompletableFuture<Void> future() { |
| 159 | return future; |
| 160 | } |
| 161 | } |
| 162 | } |