Madan Jampani | 778f7ad | 2014-11-05 22:46:15 -0800 | [diff] [blame^] | 1 | package org.onlab.onos.store.service.impl; |
| 2 | |
| 3 | import static com.google.common.base.Preconditions.checkArgument; |
| 4 | import static com.google.common.base.Preconditions.checkState; |
| 5 | |
| 6 | import java.io.File; |
| 7 | import java.io.IOException; |
| 8 | import java.util.ArrayList; |
| 9 | import java.util.Arrays; |
| 10 | import java.util.List; |
| 11 | import java.util.concurrent.ConcurrentNavigableMap; |
| 12 | |
| 13 | import net.kuujo.copycat.log.Entry; |
| 14 | import net.kuujo.copycat.log.Log; |
| 15 | import net.kuujo.copycat.log.LogIndexOutOfBoundsException; |
| 16 | |
| 17 | import org.mapdb.Atomic; |
| 18 | import org.mapdb.BTreeMap; |
| 19 | import org.mapdb.DB; |
| 20 | import org.mapdb.DBMaker; |
| 21 | import org.mapdb.TxBlock; |
| 22 | import org.mapdb.TxMaker; |
| 23 | import org.onlab.onos.store.serializers.StoreSerializer; |
| 24 | |
| 25 | import com.google.common.collect.Lists; |
| 26 | |
| 27 | /** |
| 28 | * MapDB based log implementation. |
| 29 | */ |
| 30 | public class MapDBLog implements Log { |
| 31 | |
| 32 | private final File dbFile; |
| 33 | private TxMaker txMaker; |
| 34 | private final StoreSerializer serializer; |
| 35 | private static final String LOG_NAME = "log"; |
| 36 | private static final String SIZE_FIELD_NAME = "size"; |
| 37 | |
| 38 | public MapDBLog(File dbFile, StoreSerializer serializer) { |
| 39 | this.dbFile = dbFile; |
| 40 | this.serializer = serializer; |
| 41 | } |
| 42 | |
| 43 | @Override |
| 44 | public void open() throws IOException { |
| 45 | txMaker = DBMaker |
| 46 | .newFileDB(dbFile) |
| 47 | .makeTxMaker(); |
| 48 | } |
| 49 | |
| 50 | @Override |
| 51 | public void close() throws IOException { |
| 52 | assertIsOpen(); |
| 53 | txMaker.close(); |
| 54 | txMaker = null; |
| 55 | } |
| 56 | |
| 57 | @Override |
| 58 | public boolean isOpen() { |
| 59 | return txMaker != null; |
| 60 | } |
| 61 | |
| 62 | protected void assertIsOpen() { |
| 63 | checkState(isOpen(), "The log is not currently open."); |
| 64 | } |
| 65 | |
| 66 | @Override |
| 67 | public long appendEntry(Entry entry) { |
| 68 | checkArgument(entry != null, "expecting non-null entry"); |
| 69 | return appendEntries(entry).get(0); |
| 70 | } |
| 71 | |
| 72 | @Override |
| 73 | public List<Long> appendEntries(Entry... entries) { |
| 74 | checkArgument(entries != null, "expecting non-null entries"); |
| 75 | return appendEntries(Arrays.asList(entries)); |
| 76 | } |
| 77 | |
| 78 | @Override |
| 79 | public List<Long> appendEntries(List<Entry> entries) { |
| 80 | assertIsOpen(); |
| 81 | checkArgument(entries != null, "expecting non-null entries"); |
| 82 | final List<Long> indices = Lists.newArrayList(); |
| 83 | |
| 84 | txMaker.execute(new TxBlock() { |
| 85 | @Override |
| 86 | public void tx(DB db) { |
| 87 | BTreeMap<Long, byte[]> log = db.getTreeMap(LOG_NAME); |
| 88 | Atomic.Long size = db.getAtomicLong(SIZE_FIELD_NAME); |
| 89 | long nextIndex = log.isEmpty() ? 1 : log.lastKey() + 1; |
| 90 | for (Entry entry : entries) { |
| 91 | byte[] entryBytes = serializer.encode(entry); |
| 92 | log.put(nextIndex, entryBytes); |
| 93 | size.addAndGet(entryBytes.length); |
| 94 | indices.add(nextIndex); |
| 95 | nextIndex++; |
| 96 | } |
| 97 | } |
| 98 | }); |
| 99 | |
| 100 | return indices; |
| 101 | } |
| 102 | |
| 103 | @Override |
| 104 | public boolean containsEntry(long index) { |
| 105 | assertIsOpen(); |
| 106 | DB db = txMaker.makeTx(); |
| 107 | try { |
| 108 | BTreeMap<Long, byte[]> log = db.getTreeMap(LOG_NAME); |
| 109 | return log.containsKey(index); |
| 110 | } finally { |
| 111 | db.close(); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | @Override |
| 116 | public void delete() throws IOException { |
| 117 | assertIsOpen(); |
| 118 | txMaker.execute(new TxBlock() { |
| 119 | @Override |
| 120 | public void tx(DB db) { |
| 121 | BTreeMap<Long, byte[]> log = db.getTreeMap(LOG_NAME); |
| 122 | Atomic.Long size = db.getAtomicLong(SIZE_FIELD_NAME); |
| 123 | log.clear(); |
| 124 | size.set(0); |
| 125 | } |
| 126 | }); |
| 127 | } |
| 128 | |
| 129 | @Override |
| 130 | public <T extends Entry> T firstEntry() { |
| 131 | assertIsOpen(); |
| 132 | DB db = txMaker.makeTx(); |
| 133 | try { |
| 134 | BTreeMap<Long, byte[]> log = db.getTreeMap(LOG_NAME); |
| 135 | return log.isEmpty() ? null : serializer.decode(log.firstEntry().getValue()); |
| 136 | } finally { |
| 137 | db.close(); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | @Override |
| 142 | public long firstIndex() { |
| 143 | assertIsOpen(); |
| 144 | DB db = txMaker.makeTx(); |
| 145 | try { |
| 146 | BTreeMap<Long, byte[]> log = db.getTreeMap(LOG_NAME); |
| 147 | return log.isEmpty() ? 0 : log.firstKey(); |
| 148 | } finally { |
| 149 | db.close(); |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | @Override |
| 154 | public <T extends Entry> List<T> getEntries(long from, long to) { |
| 155 | assertIsOpen(); |
| 156 | DB db = txMaker.makeTx(); |
| 157 | try { |
| 158 | BTreeMap<Long, byte[]> log = db.getTreeMap(LOG_NAME); |
| 159 | if (log.isEmpty()) { |
| 160 | throw new LogIndexOutOfBoundsException("Log is empty"); |
| 161 | } else if (from < log.firstKey()) { |
| 162 | throw new LogIndexOutOfBoundsException("From index out of bounds."); |
| 163 | } else if (to > log.lastKey()) { |
| 164 | throw new LogIndexOutOfBoundsException("To index out of bounds."); |
| 165 | } |
| 166 | List<T> entries = new ArrayList<>((int) (to - from + 1)); |
| 167 | for (long i = from; i <= to; i++) { |
| 168 | T entry = serializer.decode(log.get(i)); |
| 169 | entries.add(entry); |
| 170 | } |
| 171 | return entries; |
| 172 | } finally { |
| 173 | db.close(); |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | @Override |
| 178 | public <T extends Entry> T getEntry(long index) { |
| 179 | assertIsOpen(); |
| 180 | DB db = txMaker.makeTx(); |
| 181 | try { |
| 182 | BTreeMap<Long, byte[]> log = db.getTreeMap(LOG_NAME); |
| 183 | byte[] entryBytes = log.get(index); |
| 184 | return entryBytes == null ? null : serializer.decode(entryBytes); |
| 185 | } finally { |
| 186 | db.close(); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | @Override |
| 191 | public boolean isEmpty() { |
| 192 | assertIsOpen(); |
| 193 | DB db = txMaker.makeTx(); |
| 194 | try { |
| 195 | BTreeMap<Long, byte[]> log = db.getTreeMap(LOG_NAME); |
| 196 | return log.isEmpty(); |
| 197 | } finally { |
| 198 | db.close(); |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | @Override |
| 203 | public <T extends Entry> T lastEntry() { |
| 204 | assertIsOpen(); |
| 205 | DB db = txMaker.makeTx(); |
| 206 | try { |
| 207 | BTreeMap<Long, byte[]> log = db.getTreeMap(LOG_NAME); |
| 208 | return log.isEmpty() ? null : serializer.decode(log.lastEntry().getValue()); |
| 209 | } finally { |
| 210 | db.close(); |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | @Override |
| 215 | public long lastIndex() { |
| 216 | assertIsOpen(); |
| 217 | DB db = txMaker.makeTx(); |
| 218 | try { |
| 219 | BTreeMap<Long, byte[]> log = db.getTreeMap(LOG_NAME); |
| 220 | return log.isEmpty() ? 0 : log.lastKey(); |
| 221 | } finally { |
| 222 | db.close(); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | @Override |
| 227 | public void removeAfter(long index) { |
| 228 | assertIsOpen(); |
| 229 | txMaker.execute(new TxBlock() { |
| 230 | @Override |
| 231 | public void tx(DB db) { |
| 232 | BTreeMap<Long, byte[]> log = db.getTreeMap(LOG_NAME); |
| 233 | Atomic.Long size = db.getAtomicLong(SIZE_FIELD_NAME); |
| 234 | long startIndex = index + 1; |
| 235 | long endIndex = log.lastKey(); |
| 236 | for (long i = startIndex; i <= endIndex; ++i) { |
| 237 | byte[] entryBytes = log.remove(i); |
| 238 | size.addAndGet(-1L * entryBytes.length); |
| 239 | } |
| 240 | } |
| 241 | }); |
| 242 | } |
| 243 | |
| 244 | @Override |
| 245 | public long size() { |
| 246 | assertIsOpen(); |
| 247 | DB db = txMaker.makeTx(); |
| 248 | try { |
| 249 | Atomic.Long size = db.getAtomicLong(SIZE_FIELD_NAME); |
| 250 | return size.get(); |
| 251 | } finally { |
| 252 | db.close(); |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | @Override |
| 257 | public void sync() throws IOException { |
| 258 | assertIsOpen(); |
| 259 | } |
| 260 | |
| 261 | @Override |
| 262 | public void compact(long index, Entry entry) throws IOException { |
| 263 | |
| 264 | assertIsOpen(); |
| 265 | txMaker.execute(new TxBlock() { |
| 266 | @Override |
| 267 | public void tx(DB db) { |
| 268 | BTreeMap<Long, byte[]> log = db.getTreeMap(LOG_NAME); |
| 269 | Atomic.Long size = db.getAtomicLong(SIZE_FIELD_NAME); |
| 270 | ConcurrentNavigableMap<Long, byte[]> headMap = log.headMap(index); |
| 271 | long deletedBytes = headMap.keySet().stream().mapToLong(i -> log.remove(i).length).sum(); |
| 272 | size.addAndGet(-1 * deletedBytes); |
| 273 | byte[] entryBytes = serializer.encode(entry); |
| 274 | byte[] existingEntry = log.put(index, entryBytes); |
| 275 | size.addAndGet(entryBytes.length - existingEntry.length); |
| 276 | db.compact(); |
| 277 | } |
| 278 | }); |
| 279 | } |
| 280 | } |