Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 1 | package org.onlab.onos.store.service.impl; |
| 2 | |
Yuta HIGUCHI | 2fe6334 | 2014-11-17 21:33:38 -0800 | [diff] [blame^] | 3 | import static com.google.common.base.Preconditions.checkNotNull; |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 4 | import static org.slf4j.LoggerFactory.getLogger; |
Yuta HIGUCHI | f846844 | 2014-11-11 10:09:20 -0800 | [diff] [blame] | 5 | |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 6 | import java.util.Arrays; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 7 | import java.util.List; |
Yuta HIGUCHI | 841c0b6 | 2014-11-13 20:27:14 -0800 | [diff] [blame] | 8 | import java.util.Map; |
Madan Jampani | f5d263b | 2014-11-13 10:04:40 -0800 | [diff] [blame] | 9 | import java.util.Set; |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 10 | import java.util.UUID; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 11 | import java.util.concurrent.CompletableFuture; |
| 12 | import java.util.concurrent.ExecutionException; |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 13 | import java.util.concurrent.TimeUnit; |
Yuta HIGUCHI | b9d6866 | 2014-11-14 16:06:03 -0800 | [diff] [blame] | 14 | import java.util.concurrent.TimeoutException; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 15 | |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 16 | import net.kuujo.copycat.cluster.TcpMember; |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 17 | import net.kuujo.copycat.event.EventHandler; |
| 18 | import net.kuujo.copycat.event.LeaderElectEvent; |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 19 | import net.kuujo.copycat.protocol.SubmitRequest; |
| 20 | import net.kuujo.copycat.protocol.SubmitResponse; |
| 21 | import net.kuujo.copycat.spi.protocol.ProtocolClient; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 22 | |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 23 | import org.onlab.onos.store.service.BatchReadRequest; |
| 24 | import org.onlab.onos.store.service.BatchWriteRequest; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 25 | import org.onlab.onos.store.service.DatabaseException; |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 26 | import org.onlab.onos.store.service.ReadResult; |
Yuta HIGUCHI | 841c0b6 | 2014-11-13 20:27:14 -0800 | [diff] [blame] | 27 | import org.onlab.onos.store.service.VersionedValue; |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 28 | import org.onlab.onos.store.service.WriteResult; |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 29 | import org.slf4j.Logger; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 30 | |
Madan Jampani | 686fa18 | 2014-11-04 23:16:27 -0800 | [diff] [blame] | 31 | /** |
| 32 | * Client for interacting with the Copycat Raft cluster. |
| 33 | */ |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 34 | public class DatabaseClient implements EventHandler<LeaderElectEvent> { |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 35 | |
Yuta HIGUCHI | b9d6866 | 2014-11-14 16:06:03 -0800 | [diff] [blame] | 36 | private static final int RETRIES = 5; |
| 37 | |
| 38 | private static final int TIMEOUT_MS = 2000; |
| 39 | |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 40 | private final Logger log = getLogger(getClass()); |
| 41 | |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 42 | private final DatabaseProtocolService protocol; |
Yuta HIGUCHI | 2fe6334 | 2014-11-17 21:33:38 -0800 | [diff] [blame^] | 43 | private volatile ProtocolClient client = null; |
| 44 | private volatile TcpMember currentLeader = null; |
| 45 | |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 46 | |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 47 | public DatabaseClient(DatabaseProtocolService protocol) { |
Yuta HIGUCHI | 2fe6334 | 2014-11-17 21:33:38 -0800 | [diff] [blame^] | 48 | this.protocol = checkNotNull(protocol); |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 49 | } |
| 50 | |
Yuta HIGUCHI | 2fe6334 | 2014-11-17 21:33:38 -0800 | [diff] [blame^] | 51 | // FIXME This handler relies on a fact that local node is part of Raft cluster |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 52 | @Override |
| 53 | public void handle(LeaderElectEvent event) { |
Yuta HIGUCHI | 2fe6334 | 2014-11-17 21:33:38 -0800 | [diff] [blame^] | 54 | final TcpMember newLeader = event.leader(); |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 55 | if (newLeader != null && !newLeader.equals(currentLeader)) { |
Yuta HIGUCHI | 2fe6334 | 2014-11-17 21:33:38 -0800 | [diff] [blame^] | 56 | log.info("{} became the new leader", newLeader); |
| 57 | ProtocolClient prevClient = client; |
| 58 | ProtocolClient newclient = protocol.createClient(newLeader); |
| 59 | newclient.connect(); |
| 60 | client = newclient; |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 61 | currentLeader = newLeader; |
Yuta HIGUCHI | 2fe6334 | 2014-11-17 21:33:38 -0800 | [diff] [blame^] | 62 | if (prevClient != null) { |
| 63 | prevClient.close(); |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 64 | } |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 65 | } |
| 66 | } |
| 67 | |
| 68 | private String nextRequestId() { |
| 69 | return UUID.randomUUID().toString(); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 70 | } |
| 71 | |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 72 | public void waitForLeader() { |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 73 | if (currentLeader != null) { |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 74 | return; |
| 75 | } |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 76 | |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 77 | log.info("No leader in cluster, waiting for election."); |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 78 | |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 79 | try { |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 80 | while (currentLeader == null) { |
| 81 | Thread.sleep(200); |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 82 | } |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 83 | log.info("Leader appeared: {}", currentLeader); |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 84 | return; |
| 85 | } catch (InterruptedException e) { |
| 86 | log.error("Interrupted while waiting for Leader", e); |
| 87 | Thread.currentThread().interrupt(); |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 88 | } |
| 89 | } |
| 90 | |
| 91 | private <T> T submit(String operationName, Object... args) { |
| 92 | waitForLeader(); |
| 93 | if (currentLeader == null) { |
| 94 | throw new DatabaseException("Raft cluster does not have a leader."); |
| 95 | } |
| 96 | |
| 97 | SubmitRequest request = |
| 98 | new SubmitRequest(nextRequestId(), operationName, Arrays.asList(args)); |
| 99 | |
Yuta HIGUCHI | 2fe6334 | 2014-11-17 21:33:38 -0800 | [diff] [blame^] | 100 | CompletableFuture<SubmitResponse> submitResponse = client.submit(request); |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 101 | |
| 102 | log.debug("Sent {} to {}", request, currentLeader); |
| 103 | |
| 104 | try { |
| 105 | return (T) submitResponse.get(TIMEOUT_MS, TimeUnit.MILLISECONDS).result(); |
| 106 | } catch (ExecutionException | InterruptedException e) { |
| 107 | throw new DatabaseException(e); |
| 108 | } catch (TimeoutException e) { |
| 109 | throw new DatabaseException.Timeout(e); |
Yuta HIGUCHI | 39da979 | 2014-11-14 02:07:04 -0800 | [diff] [blame] | 110 | } |
| 111 | } |
| 112 | |
| 113 | public boolean createTable(String tableName) { |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 114 | return submit("createTable", tableName); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 115 | } |
| 116 | |
Madan Jampani | def2c65 | 2014-11-12 13:50:10 -0800 | [diff] [blame] | 117 | public boolean createTable(String tableName, int ttlMillis) { |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 118 | return submit("createTable", tableName, ttlMillis); |
Madan Jampani | def2c65 | 2014-11-12 13:50:10 -0800 | [diff] [blame] | 119 | } |
| 120 | |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 121 | public void dropTable(String tableName) { |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 122 | submit("dropTable", tableName); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 123 | } |
| 124 | |
| 125 | public void dropAllTables() { |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 126 | submit("dropAllTables"); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 127 | } |
| 128 | |
Madan Jampani | f5d263b | 2014-11-13 10:04:40 -0800 | [diff] [blame] | 129 | public Set<String> listTables() { |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 130 | return submit("listTables"); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 131 | } |
| 132 | |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 133 | public List<ReadResult> batchRead(BatchReadRequest batchRequest) { |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 134 | return submit("read", batchRequest); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 135 | } |
| 136 | |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame] | 137 | public List<WriteResult> batchWrite(BatchWriteRequest batchRequest) { |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 138 | return submit("write", batchRequest); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 139 | } |
Yuta HIGUCHI | 841c0b6 | 2014-11-13 20:27:14 -0800 | [diff] [blame] | 140 | |
| 141 | public Map<String, VersionedValue> getAll(String tableName) { |
Madan Jampani | a88d1f5 | 2014-11-14 16:45:24 -0800 | [diff] [blame] | 142 | return submit("getAll", tableName); |
Yuta HIGUCHI | 841c0b6 | 2014-11-13 20:27:14 -0800 | [diff] [blame] | 143 | } |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 144 | } |