+public class Shard extends RaftActor {
+
+ private static final ConfigParams configParams = new ShardConfigParams();
+
+ public static final String DEFAULT_NAME = "default";
+
+ // The state of this Shard
+ private final InMemoryDOMDataStore store;
+
+ private final Map<Object, DOMStoreThreePhaseCommitCohort>
+ modificationToCohort = new HashMap<>();
+
+ private final LoggingAdapter LOG =
+ Logging.getLogger(getContext().system(), this);
+
+ // By default persistent will be true and can be turned off using the system
+ // property shard.persistent
+ private final boolean persistent;
+
+ /// The name of this shard
+ private final ShardIdentifier name;
+
+ private volatile SchemaContext schemaContext;
+
+ private final ShardStats shardMBean;
+
+ private final List<ActorSelection> dataChangeListeners = new ArrayList<>();
+
+ private Shard(ShardIdentifier name, Map<ShardIdentifier, String> peerAddresses) {
+ super(name.toString(), mapPeerAddresses(peerAddresses), Optional.of(configParams));
+
+ this.name = name;
+
+ String setting = System.getProperty("shard.persistent");
+
+ this.persistent = !"false".equals(setting);
+
+ LOG.info("Shard created : {} persistent : {}", name, persistent);
+
+ store = InMemoryDOMDataStoreFactory.create(name.toString(), null);
+
+ shardMBean = ShardMBeanFactory.getShardStatsMBean(name.toString());
+
+ }
+
+ private static Map<String, String> mapPeerAddresses(Map<ShardIdentifier, String> peerAddresses){
+ Map<String , String> map = new HashMap<>();
+
+ for(Map.Entry<ShardIdentifier, String> entry : peerAddresses.entrySet()){
+ map.put(entry.getKey().toString(), entry.getValue());
+ }
+
+ return map;
+ }
+
+
+
+
+ public static Props props(final ShardIdentifier name,
+ final Map<ShardIdentifier, String> peerAddresses) {
+ Preconditions.checkNotNull(name, "name should not be null");
+ Preconditions.checkNotNull(peerAddresses, "peerAddresses should not be null");
+
+ return Props.create(new Creator<Shard>() {
+
+ @Override
+ public Shard create() throws Exception {
+ return new Shard(name, peerAddresses);
+ }
+
+ });
+ }
+
+
+ @Override public void onReceiveCommand(Object message) {
+ LOG.debug("Received message {} from {}", message.getClass().toString(),
+ getSender());
+
+ if (message.getClass()
+ .equals(CreateTransactionChain.SERIALIZABLE_CLASS)) {
+ if (isLeader()) {
+ createTransactionChain();
+ } else if (getLeader() != null) {
+ getLeader().forward(message, getContext());
+ }
+ } else if (message instanceof RegisterChangeListener) {
+ registerChangeListener((RegisterChangeListener) message);
+ } else if (message instanceof UpdateSchemaContext) {
+ updateSchemaContext((UpdateSchemaContext) message);
+ } else if (message instanceof ForwardedCommitTransaction) {
+ handleForwardedCommit((ForwardedCommitTransaction) message);
+ } else if (message.getClass()
+ .equals(CreateTransaction.SERIALIZABLE_CLASS)) {
+ if (isLeader()) {
+ createTransaction(CreateTransaction.fromSerializable(message));
+ } else if (getLeader() != null) {
+ getLeader().forward(message, getContext());
+ }
+ } else if (message instanceof PeerAddressResolved) {
+ PeerAddressResolved resolved = (PeerAddressResolved) message;
+ setPeerAddress(resolved.getPeerId().toString(), resolved.getPeerAddress());
+ } else {
+ super.onReceiveCommand(message);
+ }
+ }
+
+ private ActorRef createTypedTransactionActor(
+ CreateTransaction createTransaction, ShardTransactionIdentifier transactionId) {
+ if (createTransaction.getTransactionType()
+ == TransactionProxy.TransactionType.READ_ONLY.ordinal()) {
+
+ shardMBean.incrementReadOnlyTransactionCount();
+
+ return getContext().actorOf(
+ ShardTransaction
+ .props(store.newReadOnlyTransaction(), getSelf(),
+ schemaContext), transactionId.toString());
+
+ } else if (createTransaction.getTransactionType()
+ == TransactionProxy.TransactionType.READ_WRITE.ordinal()) {
+
+ shardMBean.incrementReadWriteTransactionCount();
+
+ return getContext().actorOf(
+ ShardTransaction
+ .props(store.newReadWriteTransaction(), getSelf(),
+ schemaContext), transactionId.toString());
+
+
+ } else if (createTransaction.getTransactionType()
+ == TransactionProxy.TransactionType.WRITE_ONLY.ordinal()) {
+
+ shardMBean.incrementWriteOnlyTransactionCount();