| package net.onrc.onos.core.datastore.hazelcast; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import net.onrc.onos.core.datastore.IKVTable; |
| import net.onrc.onos.core.datastore.IKVTableID; |
| import net.onrc.onos.core.datastore.ObjectDoesntExistException; |
| import net.onrc.onos.core.datastore.ObjectExistsException; |
| import net.onrc.onos.core.datastore.WrongVersionException; |
| |
| import org.apache.commons.lang.ArrayUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.hazelcast.core.IMap; |
| import com.hazelcast.nio.ObjectDataInput; |
| import com.hazelcast.nio.ObjectDataOutput; |
| import com.hazelcast.nio.serialization.IdentifiedDataSerializable; |
| |
| public class HZTable implements IKVTable, IKVTableID { |
| @SuppressWarnings("unused") |
| private static final Logger log = LoggerFactory.getLogger(HZTable.class); |
| |
| // not sure how strict this should be managed |
| private static final AtomicLong INITIAL_VERSION = new AtomicLong(HZClient.VERSION_NONEXISTENT); |
| |
| /** |
| * generate a new initial version for an entry. |
| * |
| * @return initial value |
| */ |
| protected static long getInitialVersion() { |
| long version = INITIAL_VERSION.incrementAndGet(); |
| if (version == HZClient.VERSION_NONEXISTENT) { |
| // used up whole 64bit space? |
| version = INITIAL_VERSION.incrementAndGet(); |
| } |
| return version; |
| } |
| |
| /** |
| * increment version, avoiding versionNonexistant. |
| * |
| * @param version |
| * @return |
| */ |
| protected static long getNextVersion(final long version) { |
| long nextVersion = version + 1; |
| if (nextVersion == HZClient.VERSION_NONEXISTENT) { |
| ++nextVersion; |
| } |
| return nextVersion; |
| } |
| |
| static class VersionedValue implements IdentifiedDataSerializable { |
| private static final long serialVersionUID = -3149375966890712708L; |
| |
| private byte[] value; |
| private long version; |
| |
| protected VersionedValue() { |
| value = new byte[0]; |
| version = HZClient.VERSION_NONEXISTENT; |
| } |
| |
| public VersionedValue(final byte[] value, final long version) { |
| this.value = ArrayUtils.clone(value); |
| this.version = version; |
| } |
| |
| public byte[] getValue() { |
| return value; |
| } |
| |
| public long getVersion() { |
| return version; |
| } |
| |
| public void setValue(final byte[] value) { |
| this.value = ArrayUtils.clone(value); |
| } |
| |
| public void setNextVersion() { |
| this.version = getNextVersion(this.version); |
| } |
| |
| @Override |
| public void writeData(final ObjectDataOutput out) throws IOException { |
| out.writeLong(version); |
| out.writeInt(value.length); |
| if (value.length > 0) { |
| out.write(value); |
| } |
| } |
| |
| @Override |
| public void readData(final ObjectDataInput in) throws IOException { |
| version = in.readLong(); |
| final int valueLen = in.readInt(); |
| value = new byte[valueLen]; |
| in.readFully(value); |
| } |
| |
| @Override |
| public int getFactoryId() { |
| return VersionedValueSerializableFactory.FACTORY_ID; |
| } |
| |
| @Override |
| public int getId() { |
| return VersionedValueSerializableFactory.VERSIONED_VALUE_ID; |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + (int) (version ^ (version >>> 32)); |
| result = prime * result + Arrays.hashCode(value); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(final Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null) { |
| return false; |
| } |
| if (getClass() != obj.getClass()) { |
| return false; |
| } |
| VersionedValue other = (VersionedValue) obj; |
| if (version != other.version) { |
| return false; |
| } |
| if (!Arrays.equals(value, other.value)) { |
| return false; |
| } |
| return true; |
| } |
| } |
| |
| // TODO Refactor and extract common parts |
| public static class Entry implements IKVEntry { |
| final byte[] key; |
| byte[] value; |
| long version; |
| |
| public Entry(final byte[] key, final byte[] value, final long version) { |
| this.key = key.clone(); |
| this.setValue(value); |
| this.setVersion(version); |
| } |
| |
| public Entry(final byte[] key) { |
| this(key, null, HZClient.VERSION_NONEXISTENT); |
| } |
| |
| @Override |
| public byte[] getKey() { |
| return key.clone(); |
| } |
| |
| @Override |
| public byte[] getValue() { |
| return ArrayUtils.clone(value); |
| } |
| |
| @Override |
| public long getVersion() { |
| return version; |
| } |
| |
| void setValue(final byte[] value) { |
| this.value = ArrayUtils.clone(value); |
| } |
| |
| void setVersion(final long version) { |
| this.version = version; |
| } |
| } |
| |
| |
| private final String mapName; |
| private final IMap<byte[], VersionedValue> map; |
| |
| public HZTable(final String mapName, final IMap<byte[], VersionedValue> map) { |
| this.mapName = mapName; |
| this.map = map; |
| } |
| |
| @Override |
| public String getTableName() { |
| return mapName; |
| } |
| |
| @Override |
| public IKVTableID getTableId() { |
| return this; |
| } |
| |
| @Override |
| public long create(final byte[] key, final byte[] value) throws ObjectExistsException { |
| final long version = getInitialVersion(); |
| VersionedValue existing = map.putIfAbsent(key, new VersionedValue(value, version)); |
| if (existing != null) { |
| throw new ObjectExistsException(this, key); |
| } |
| return version; |
| } |
| |
| @Override |
| public long forceCreate(final byte[] key, final byte[] value) { |
| final long version = getInitialVersion(); |
| map.set(key, new VersionedValue(value, version)); |
| return version; |
| } |
| |
| @Override |
| public IKVEntry read(final byte[] key) throws ObjectDoesntExistException { |
| final VersionedValue value = map.get(key); |
| if (value == null) { |
| throw new ObjectDoesntExistException(this, key); |
| } |
| return new Entry(key, value.getValue(), value.getVersion()); |
| } |
| |
| @Override |
| public long update(final byte[] key, final byte[] value, final long version) |
| throws ObjectDoesntExistException, WrongVersionException { |
| |
| try { |
| map.lock(key); |
| final VersionedValue oldValue = map.get(key); |
| if (oldValue == null) { |
| throw new ObjectDoesntExistException(this, key); |
| } |
| if (oldValue.getVersion() != version) { |
| throw new WrongVersionException(this, key, version, oldValue.getVersion()); |
| } |
| final long nextVersion = getNextVersion(version); |
| map.set(key, new VersionedValue(value, nextVersion)); |
| return nextVersion; |
| } finally { |
| map.unlock(key); |
| } |
| } |
| |
| @Override |
| public long update(final byte[] key, final byte[] value) |
| throws ObjectDoesntExistException { |
| |
| try { |
| map.lock(key); |
| final VersionedValue valueInMap = map.get(key); |
| if (valueInMap == null) { |
| throw new ObjectDoesntExistException(this, key); |
| } |
| valueInMap.setValue(value); |
| valueInMap.setNextVersion(); |
| map.set(key, valueInMap); |
| return valueInMap.getVersion(); |
| } finally { |
| map.unlock(key); |
| } |
| } |
| |
| @Override |
| public long delete(final byte[] key, final long version) |
| throws ObjectDoesntExistException, WrongVersionException { |
| |
| try { |
| map.lock(key); |
| final VersionedValue oldValue = map.get(key); |
| if (oldValue == null) { |
| throw new ObjectDoesntExistException(this, key); |
| } |
| if (oldValue.getVersion() != version) { |
| throw new WrongVersionException(this, key, version, oldValue.getVersion()); |
| } |
| map.delete(key); |
| return oldValue.getVersion(); |
| } finally { |
| map.unlock(key); |
| } |
| } |
| |
| @Override |
| public long forceDelete(final byte[] key) { |
| final VersionedValue valueInMap = map.remove(key); |
| if (valueInMap == null) { |
| return HZClient.VERSION_NONEXISTENT; |
| } |
| return valueInMap.getVersion(); |
| } |
| |
| @Override |
| public Iterable<IKVEntry> getAllEntries() { |
| final Set<IMap.Entry<byte[], VersionedValue>> entries = map.entrySet(); |
| List<IKVEntry> entryList = new ArrayList<IKVTable.IKVEntry>(entries.size()); |
| for (IMap.Entry<byte[], VersionedValue> entry : entries) { |
| entryList.add(new Entry(entry.getKey(), entry.getValue().getValue(), entry.getValue().getVersion())); |
| } |
| return entryList; |
| } |
| |
| @Override |
| public String toString() { |
| return "[HZTable " + mapName + "]"; |
| } |
| |
| IMap<byte[], VersionedValue> getBackendMap() { |
| return this.map; |
| } |
| |
| @Override |
| public long getVersionNonexistant() { |
| return HZClient.VERSION_NONEXISTENT; |
| } |
| } |