Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 1 | package org.onlab.onos.store.service.impl; |
| 2 | |
Yuta HIGUCHI | 39ae550 | 2014-11-05 16:42:12 -0800 | [diff] [blame] | 3 | import static org.slf4j.LoggerFactory.getLogger; |
| 4 | |
Yuta HIGUCHI | a7680a3 | 2014-11-06 22:17:37 -0800 | [diff] [blame] | 5 | import java.io.ByteArrayInputStream; |
| 6 | import java.io.ByteArrayOutputStream; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 7 | import java.util.ArrayList; |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 8 | import java.util.Arrays; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 9 | import java.util.List; |
| 10 | import java.util.Map; |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 11 | import java.util.Set; |
Yuta HIGUCHI | a7680a3 | 2014-11-06 22:17:37 -0800 | [diff] [blame] | 12 | import java.util.zip.DeflaterOutputStream; |
| 13 | import java.util.zip.InflaterInputStream; |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 14 | |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 15 | import net.kuujo.copycat.Command; |
| 16 | import net.kuujo.copycat.Query; |
| 17 | import net.kuujo.copycat.StateMachine; |
| 18 | |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 19 | import org.onlab.onos.store.cluster.messaging.MessageSubject; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 20 | import org.onlab.onos.store.serializers.KryoSerializer; |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 21 | import org.onlab.onos.store.service.BatchReadRequest; |
| 22 | import org.onlab.onos.store.service.BatchWriteRequest; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 23 | import org.onlab.onos.store.service.ReadRequest; |
| 24 | import org.onlab.onos.store.service.ReadResult; |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 25 | import org.onlab.onos.store.service.ReadStatus; |
Madan Jampani | 37c2e70 | 2014-11-04 18:11:10 -0800 | [diff] [blame] | 26 | import org.onlab.onos.store.service.VersionedValue; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 27 | import org.onlab.onos.store.service.WriteRequest; |
| 28 | import org.onlab.onos.store.service.WriteResult; |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 29 | import org.onlab.onos.store.service.WriteStatus; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 30 | import org.onlab.util.KryoNamespace; |
Yuta HIGUCHI | 39ae550 | 2014-11-05 16:42:12 -0800 | [diff] [blame] | 31 | import org.slf4j.Logger; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 32 | |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 33 | import com.beust.jcommander.internal.Lists; |
Yuta HIGUCHI | 1838f88 | 2014-11-05 18:42:00 -0800 | [diff] [blame] | 34 | import com.google.common.collect.ImmutableList; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 35 | import com.google.common.collect.Maps; |
Yuta HIGUCHI | a7680a3 | 2014-11-06 22:17:37 -0800 | [diff] [blame] | 36 | import com.google.common.io.ByteStreams; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 37 | |
Madan Jampani | 686fa18 | 2014-11-04 23:16:27 -0800 | [diff] [blame] | 38 | /** |
| 39 | * StateMachine whose transitions are coordinated/replicated |
| 40 | * by Raft consensus. |
| 41 | * Each Raft cluster member has a instance of this state machine that is |
| 42 | * independently updated in lock step once there is consensus |
| 43 | * on the next transition. |
| 44 | */ |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 45 | public class DatabaseStateMachine implements StateMachine { |
| 46 | |
Yuta HIGUCHI | 39ae550 | 2014-11-05 16:42:12 -0800 | [diff] [blame] | 47 | private final Logger log = getLogger(getClass()); |
| 48 | |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 49 | // message subject for database update notifications. |
| 50 | public static MessageSubject DATABASE_UPDATE_EVENTS = |
| 51 | new MessageSubject("database-update-events"); |
| 52 | |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 53 | // serializer used for snapshot |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 54 | public static final KryoSerializer SERIALIZER = new KryoSerializer() { |
| 55 | @Override |
| 56 | protected void setupKryoPool() { |
| 57 | serializerPool = KryoNamespace.newBuilder() |
| 58 | .register(VersionedValue.class) |
| 59 | .register(State.class) |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 60 | .register(BatchReadRequest.class) |
| 61 | .register(BatchWriteRequest.class) |
| 62 | .register(ReadStatus.class) |
| 63 | .register(WriteStatus.class) |
| 64 | // TODO: Move this out ? |
| 65 | .register(TableModificationEvent.class) |
Madan Jampani | 9b19a82 | 2014-11-04 21:37:13 -0800 | [diff] [blame] | 66 | .register(ClusterMessagingProtocol.COMMON) |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 67 | .build() |
| 68 | .populate(1); |
| 69 | } |
| 70 | }; |
| 71 | |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 72 | private final List<DatabaseUpdateEventListener> listeners = Lists.newLinkedList(); |
| 73 | |
| 74 | // durable internal state of the database. |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 75 | private State state = new State(); |
| 76 | |
Yuta HIGUCHI | a7680a3 | 2014-11-06 22:17:37 -0800 | [diff] [blame] | 77 | private boolean compressSnapshot = false; |
| 78 | |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 79 | @Command |
| 80 | public boolean createTable(String tableName) { |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 81 | Map<String, VersionedValue> existingTable = |
| 82 | state.getTables().putIfAbsent(tableName, Maps.newHashMap()); |
| 83 | if (existingTable == null) { |
| 84 | for (DatabaseUpdateEventListener listener : listeners) { |
| 85 | listener.tableCreated(tableName, Integer.MAX_VALUE); |
| 86 | } |
| 87 | return true; |
| 88 | } |
| 89 | return false; |
| 90 | } |
| 91 | |
| 92 | @Command |
| 93 | public boolean createTable(String tableName, int expirationTimeMillis) { |
| 94 | Map<String, VersionedValue> existingTable = |
| 95 | state.getTables().putIfAbsent(tableName, Maps.newHashMap()); |
| 96 | if (existingTable == null) { |
| 97 | for (DatabaseUpdateEventListener listener : listeners) { |
| 98 | listener.tableCreated(tableName, expirationTimeMillis); |
| 99 | } |
| 100 | return true; |
| 101 | } |
| 102 | return false; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | @Command |
| 106 | public boolean dropTable(String tableName) { |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 107 | Map<String, VersionedValue> table = state.getTables().remove(tableName); |
| 108 | if (table != null) { |
| 109 | for (DatabaseUpdateEventListener listener : listeners) { |
| 110 | listener.tableDeleted(tableName); |
| 111 | } |
| 112 | return true; |
| 113 | } |
| 114 | return false; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | @Command |
| 118 | public boolean dropAllTables() { |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 119 | Set<String> tableNames = state.getTables().keySet(); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 120 | state.getTables().clear(); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 121 | for (DatabaseUpdateEventListener listener : listeners) { |
| 122 | for (String tableName : tableNames) { |
| 123 | listener.tableDeleted(tableName); |
| 124 | } |
| 125 | } |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 126 | return true; |
| 127 | } |
| 128 | |
| 129 | @Query |
Yuta HIGUCHI | 1838f88 | 2014-11-05 18:42:00 -0800 | [diff] [blame] | 130 | public List<String> listTables() { |
| 131 | return ImmutableList.copyOf(state.getTables().keySet()); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | @Query |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 135 | public List<ReadResult> read(BatchReadRequest batchRequest) { |
| 136 | List<ReadResult> results = new ArrayList<>(batchRequest.batchSize()); |
| 137 | for (ReadRequest request : batchRequest.getAsList()) { |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 138 | Map<String, VersionedValue> table = state.getTables().get(request.tableName()); |
| 139 | if (table == null) { |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 140 | results.add(new ReadResult(ReadStatus.NO_SUCH_TABLE, request.tableName(), request.key(), null)); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 141 | continue; |
| 142 | } |
Yuta HIGUCHI | 3bd8cdc | 2014-11-05 19:11:44 -0800 | [diff] [blame] | 143 | VersionedValue value = VersionedValue.copy(table.get(request.key())); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 144 | results.add(new ReadResult(ReadStatus.OK, request.tableName(), request.key(), value)); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 145 | } |
| 146 | return results; |
| 147 | } |
| 148 | |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 149 | WriteStatus checkIfApplicable(WriteRequest request, |
| 150 | VersionedValue value) { |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 151 | |
| 152 | switch (request.type()) { |
| 153 | case PUT: |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 154 | return WriteStatus.OK; |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 155 | |
| 156 | case PUT_IF_ABSENT: |
| 157 | if (value == null) { |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 158 | return WriteStatus.OK; |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 159 | } |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 160 | return WriteStatus.PRECONDITION_VIOLATION; |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 161 | case PUT_IF_VALUE: |
| 162 | case REMOVE_IF_VALUE: |
| 163 | if (value != null && Arrays.equals(value.value(), request.oldValue())) { |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 164 | return WriteStatus.OK; |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 165 | } |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 166 | return WriteStatus.PRECONDITION_VIOLATION; |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 167 | case PUT_IF_VERSION: |
| 168 | case REMOVE_IF_VERSION: |
| 169 | if (value != null && request.previousVersion() == value.version()) { |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 170 | return WriteStatus.OK; |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 171 | } |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 172 | return WriteStatus.PRECONDITION_VIOLATION; |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 173 | case REMOVE: |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 174 | return WriteStatus.OK; |
Yuta HIGUCHI | c6b8f61 | 2014-11-06 19:04:13 -0800 | [diff] [blame] | 175 | default: |
| 176 | break; |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 177 | } |
| 178 | log.error("Should never reach here {}", request); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 179 | return WriteStatus.ABORTED; |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 180 | } |
| 181 | |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 182 | @Command |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 183 | public List<WriteResult> write(BatchWriteRequest batchRequest) { |
Yuta HIGUCHI | bddc81c4 | 2014-11-05 18:53:09 -0800 | [diff] [blame] | 184 | |
| 185 | // applicability check |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 186 | boolean abort = false; |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 187 | List<WriteStatus> validationResults = new ArrayList<>(batchRequest.batchSize()); |
| 188 | for (WriteRequest request : batchRequest.getAsList()) { |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 189 | Map<String, VersionedValue> table = state.getTables().get(request.tableName()); |
| 190 | if (table == null) { |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 191 | validationResults.add(WriteStatus.NO_SUCH_TABLE); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 192 | abort = true; |
| 193 | continue; |
| 194 | } |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 195 | final VersionedValue value = table.get(request.key()); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 196 | WriteStatus result = checkIfApplicable(request, value); |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 197 | validationResults.add(result); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 198 | if (result != WriteStatus.OK) { |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 199 | abort = true; |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 200 | } |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 201 | } |
| 202 | |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 203 | List<WriteResult> results = new ArrayList<>(batchRequest.batchSize()); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 204 | |
| 205 | if (abort) { |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 206 | for (WriteStatus validationResult : validationResults) { |
| 207 | if (validationResult == WriteStatus.OK) { |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 208 | // aborted due to applicability check failure on other request |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 209 | results.add(new WriteResult(WriteStatus.ABORTED, null)); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 210 | } else { |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 211 | results.add(new WriteResult(validationResult, null)); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 212 | } |
| 213 | } |
| 214 | return results; |
| 215 | } |
| 216 | |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 217 | List<TableModificationEvent> tableModificationEvents = Lists.newLinkedList(); |
| 218 | |
Yuta HIGUCHI | bddc81c4 | 2014-11-05 18:53:09 -0800 | [diff] [blame] | 219 | // apply changes |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 220 | for (WriteRequest request : batchRequest.getAsList()) { |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 221 | Map<String, VersionedValue> table = state.getTables().get(request.tableName()); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 222 | |
| 223 | TableModificationEvent tableModificationEvent = null; |
Yuta HIGUCHI | bddc81c4 | 2014-11-05 18:53:09 -0800 | [diff] [blame] | 224 | // FIXME: If this method could be called by multiple thread, |
| 225 | // synchronization scope is wrong. |
| 226 | // Whole function including applicability check needs to be protected. |
| 227 | // Confirm copycat's thread safety requirement for StateMachine |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 228 | // TODO: If we need isolation, we need to block reads also |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 229 | synchronized (table) { |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 230 | switch (request.type()) { |
| 231 | case PUT: |
| 232 | case PUT_IF_ABSENT: |
| 233 | case PUT_IF_VALUE: |
| 234 | case PUT_IF_VERSION: |
| 235 | VersionedValue newValue = new VersionedValue(request.newValue(), state.nextVersion()); |
| 236 | VersionedValue previousValue = table.put(request.key(), newValue); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 237 | WriteResult putResult = new WriteResult(WriteStatus.OK, previousValue); |
| 238 | results.add(putResult); |
| 239 | tableModificationEvent = (previousValue == null) ? |
| 240 | TableModificationEvent.rowAdded(request.tableName(), request.key()) : |
| 241 | TableModificationEvent.rowUpdated(request.tableName(), request.key()); |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 242 | break; |
| 243 | |
| 244 | case REMOVE: |
| 245 | case REMOVE_IF_VALUE: |
| 246 | case REMOVE_IF_VERSION: |
| 247 | VersionedValue removedValue = table.remove(request.key()); |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 248 | WriteResult removeResult = new WriteResult(WriteStatus.OK, removedValue); |
| 249 | results.add(removeResult); |
| 250 | if (removedValue != null) { |
| 251 | tableModificationEvent = |
| 252 | TableModificationEvent.rowDeleted(request.tableName(), request.key()); |
| 253 | } |
Yuta HIGUCHI | 361664e | 2014-11-06 17:28:47 -0800 | [diff] [blame] | 254 | break; |
| 255 | |
| 256 | default: |
| 257 | log.error("Invalid WriteRequest type {}", request.type()); |
| 258 | break; |
| 259 | } |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 260 | } |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 261 | |
| 262 | if (tableModificationEvent != null) { |
| 263 | tableModificationEvents.add(tableModificationEvent); |
| 264 | } |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 265 | } |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 266 | |
| 267 | // notify listeners of table mod events. |
| 268 | for (DatabaseUpdateEventListener listener : listeners) { |
| 269 | for (TableModificationEvent tableModificationEvent : tableModificationEvents) { |
| 270 | listener.tableModified(tableModificationEvent); |
| 271 | } |
| 272 | } |
| 273 | |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 274 | return results; |
| 275 | } |
| 276 | |
| 277 | public class State { |
| 278 | |
| 279 | private final Map<String, Map<String, VersionedValue>> tables = |
| 280 | Maps.newHashMap(); |
| 281 | private long versionCounter = 1; |
| 282 | |
| 283 | Map<String, Map<String, VersionedValue>> getTables() { |
| 284 | return tables; |
| 285 | } |
| 286 | |
| 287 | long nextVersion() { |
| 288 | return versionCounter++; |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | @Override |
| 293 | public byte[] takeSnapshot() { |
| 294 | try { |
Yuta HIGUCHI | a7680a3 | 2014-11-06 22:17:37 -0800 | [diff] [blame] | 295 | if (compressSnapshot) { |
| 296 | byte[] input = SERIALIZER.encode(state); |
| 297 | ByteArrayOutputStream comp = new ByteArrayOutputStream(input.length); |
| 298 | DeflaterOutputStream compressor = new DeflaterOutputStream(comp); |
| 299 | compressor.write(input, 0, input.length); |
| 300 | compressor.close(); |
| 301 | return comp.toByteArray(); |
| 302 | } else { |
| 303 | return SERIALIZER.encode(state); |
| 304 | } |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 305 | } catch (Exception e) { |
Madan Jampani | 778f7ad | 2014-11-05 22:46:15 -0800 | [diff] [blame] | 306 | log.error("Failed to take snapshot", e); |
| 307 | throw new SnapshotException(e); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 308 | } |
| 309 | } |
| 310 | |
| 311 | @Override |
| 312 | public void installSnapshot(byte[] data) { |
| 313 | try { |
Yuta HIGUCHI | a7680a3 | 2014-11-06 22:17:37 -0800 | [diff] [blame] | 314 | if (compressSnapshot) { |
| 315 | ByteArrayInputStream in = new ByteArrayInputStream(data); |
| 316 | InflaterInputStream decompressor = new InflaterInputStream(in); |
| 317 | ByteStreams.toByteArray(decompressor); |
| 318 | this.state = SERIALIZER.decode(ByteStreams.toByteArray(decompressor)); |
| 319 | } else { |
| 320 | this.state = SERIALIZER.decode(data); |
| 321 | } |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 322 | } catch (Exception e) { |
Madan Jampani | 778f7ad | 2014-11-05 22:46:15 -0800 | [diff] [blame] | 323 | log.error("Failed to install from snapshot", e); |
| 324 | throw new SnapshotException(e); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 325 | } |
| 326 | } |
Madan Jampani | 12390c1 | 2014-11-12 00:35:56 -0800 | [diff] [blame^] | 327 | |
| 328 | public void addEventListener(DatabaseUpdateEventListener listener) { |
| 329 | listeners.add(listener); |
| 330 | } |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 331 | } |