- protected ShardManager(ClusterWrapper cluster, Configuration configuration,
- DatastoreContext datastoreContext) {
-
- this.cluster = Preconditions.checkNotNull(cluster, "cluster should not be null");
- this.configuration = Preconditions.checkNotNull(configuration, "configuration should not be null");
- this.datastoreContext = datastoreContext;
- this.dataPersistenceProvider = createDataPersistenceProvider(datastoreContext.isPersistent());
- this.type = datastoreContext.getDataStoreType();
- this.shardDispatcherPath =
- new Dispatchers(context().system().dispatchers()).getDispatcherPath(Dispatchers.DispatcherType.Shard);
-
- // Subscribe this actor to cluster member events
- cluster.subscribeToMemberEvents(getSelf());
-
- createLocalShards();
- }
-
- protected DataPersistenceProvider createDataPersistenceProvider(boolean persistent) {
- return (persistent) ? new PersistentDataProvider() : new NonPersistentDataProvider();
- }
-
- public static Props props(
- final ClusterWrapper cluster,
- final Configuration configuration,
- final DatastoreContext datastoreContext) {
-
- Preconditions.checkNotNull(cluster, "cluster should not be null");
- Preconditions.checkNotNull(configuration, "configuration should not be null");
-
- return Props.create(new ShardManagerCreator(cluster, configuration, datastoreContext));
- }
-
- @Override
- public void handleCommand(Object message) throws Exception {
- if (message.getClass().equals(FindPrimary.SERIALIZABLE_CLASS)) {
- findPrimary(FindPrimary.fromSerializable(message));
- } else if(message instanceof FindLocalShard){
- findLocalShard((FindLocalShard) message);
- } else if (message instanceof UpdateSchemaContext) {
- updateSchemaContext(message);
- } else if(message instanceof ActorInitialized) {
- onActorInitialized(message);
- } else if (message instanceof ClusterEvent.MemberUp){
- memberUp((ClusterEvent.MemberUp) message);
- } else if(message instanceof ClusterEvent.MemberRemoved) {
- memberRemoved((ClusterEvent.MemberRemoved) message);
- } else if(message instanceof ClusterEvent.UnreachableMember) {
- ignoreMessage(message);
- } else{
- unknownMessage(message);
- }
-
- }
-
- private void onActorInitialized(Object message) {
- final ActorRef sender = getSender();
-
- if (sender == null) {
- return; //why is a non-actor sending this message? Just ignore.
- }
-
- String actorName = sender.path().name();
- //find shard name from actor name; actor name is stringified shardId
- ShardIdentifier shardId = ShardIdentifier.builder().fromShardIdString(actorName).build();
-
- if (shardId.getShardName() == null) {
- return;
- }
- markShardAsInitialized(shardId.getShardName());
- }
-
- private void markShardAsInitialized(String shardName) {
- LOG.debug("Initializing shard [{}]", shardName);
- ShardInformation shardInformation = localShards.get(shardName);
- if (shardInformation != null) {
- shardInformation.setActorInitialized();
- }
- }
-
- @Override
- protected void handleRecover(Object message) throws Exception {
- if(dataPersistenceProvider.isRecoveryApplicable()) {
- if (message instanceof SchemaContextModules) {
- SchemaContextModules msg = (SchemaContextModules) message;
- knownModules = ImmutableSet.copyOf(msg.getModules());
- } else if (message instanceof RecoveryFailure) {
- RecoveryFailure failure = (RecoveryFailure) message;
- LOG.error("Recovery failed", failure.cause());
- } else if (message instanceof RecoveryCompleted) {
- LOG.info("Recovery complete : {}", persistenceId());
-
- // Delete all the messages from the akka journal except the last one
- deleteMessages(lastSequenceNr() - 1);
- }
- } else {
- if (message instanceof RecoveryCompleted) {
- LOG.info("Recovery complete : {}", persistenceId());
-
- // Delete all the messages from the akka journal
- deleteMessages(lastSequenceNr());
- }
- }
- }
-
- private void findLocalShard(FindLocalShard message) {
- final ShardInformation shardInformation = localShards.get(message.getShardName());
-
- if(shardInformation == null){
- getSender().tell(new LocalShardNotFound(message.getShardName()), getSelf());
- return;
- }
-
- sendResponse(shardInformation, message.isWaitUntilInitialized(), new Supplier<Object>() {
- @Override
- public Object get() {
- return new LocalShardFound(shardInformation.getActor());
- }
- });
- }
-
- private void sendResponse(ShardInformation shardInformation, boolean waitUntilInitialized,
- final Supplier<Object> messageSupplier) {
- if (!shardInformation.isShardInitialized()) {
- if(waitUntilInitialized) {
- final ActorRef sender = getSender();
- final ActorRef self = self();
- shardInformation.addRunnableOnInitialized(new Runnable() {
- @Override
- public void run() {
- sender.tell(messageSupplier.get(), self);
- }
- });
- } else {
- getSender().tell(new ActorNotInitialized(), getSelf());
- }
-
- return;
- }
-
- getSender().tell(messageSupplier.get(), getSelf());
- }
-
- private void memberRemoved(ClusterEvent.MemberRemoved message) {
- memberNameToAddress.remove(message.member().roles().head());
- }
-
- private void memberUp(ClusterEvent.MemberUp message) {
- String memberName = message.member().roles().head();
-
- memberNameToAddress.put(memberName, message.member().address());
-
- for(ShardInformation info : localShards.values()){
- String shardName = info.getShardName();
- info.updatePeerAddress(getShardIdentifier(memberName, shardName),
- getShardActorPath(shardName, memberName));
- }
- }
-
- /**
- * Notifies all the local shards of a change in the schema context
- *
- * @param message
- */
- private void updateSchemaContext(final Object message) {
- final SchemaContext schemaContext = ((UpdateSchemaContext) message).getSchemaContext();
-
- Set<ModuleIdentifier> allModuleIdentifiers = schemaContext.getAllModuleIdentifiers();
- Set<String> newModules = new HashSet<>(128);
-
- for(ModuleIdentifier moduleIdentifier : allModuleIdentifiers){
- String s = moduleIdentifier.getNamespace().toString();
- newModules.add(s);
- }
-
- if(newModules.containsAll(knownModules)) {
-
- LOG.debug("New SchemaContext has a super set of current knownModules - persisting info");
-
- knownModules = ImmutableSet.copyOf(newModules);
-
- dataPersistenceProvider.persist(new SchemaContextModules(newModules), new Procedure<SchemaContextModules>() {
-
- @Override
- public void apply(SchemaContextModules param) throws Exception {
- LOG.debug("Sending new SchemaContext to Shards");
- for (ShardInformation info : localShards.values()) {
- if (info.getActor() == null) {
- info.setActor(getContext().actorOf(Shard.props(info.getShardId(),
- info.getPeerAddresses(), datastoreContext, schemaContext)
- .withDispatcher(shardDispatcherPath), info.getShardId().toString()));
- } else {
- info.getActor().tell(message, getSelf());
- }
- }
- }
-
- });
- } else {
- LOG.debug("Rejecting schema context update - not a super set of previously known modules:\nUPDATE: {}\nKNOWN: {}",
- newModules, knownModules);
- }
-
- }
-
- private void findPrimary(FindPrimary message) {
- String shardName = message.getShardName();
-
- // First see if the there is a local replica for the shard
- final ShardInformation info = localShards.get(shardName);
- if (info != null) {
- sendResponse(info, message.isWaitUntilInitialized(), new Supplier<Object>() {
- @Override
- public Object get() {
- return new PrimaryFound(info.getActorPath().toString()).toSerializable();
- }
- });
-
- return;
- }
-
- List<String> members = configuration.getMembersFromShardName(shardName);
-
- if(cluster.getCurrentMemberName() != null) {
- members.remove(cluster.getCurrentMemberName());
- }
-
- /**
- * FIXME: Instead of sending remote shard actor path back to sender,
- * forward FindPrimary message to remote shard manager
- */
- // There is no way for us to figure out the primary (for now) so assume
- // that one of the remote nodes is a primary
- for(String memberName : members) {
- Address address = memberNameToAddress.get(memberName);
- if(address != null){
- String path =
- getShardActorPath(shardName, memberName);
- getSender().tell(new PrimaryFound(path).toSerializable(), getSelf());
- return;
- }
- }
- getSender().tell(new PrimaryNotFound(shardName).toSerializable(), getSelf());
- }
-
- private String getShardActorPath(String shardName, String memberName) {
- Address address = memberNameToAddress.get(memberName);
- if(address != null) {
- StringBuilder builder = new StringBuilder();
- builder.append(address.toString())
- .append("/user/")
- .append(ShardManagerIdentifier.builder().type(type).build().toString())
- .append("/")
- .append(getShardIdentifier(memberName, shardName));
- return builder.toString();
- }
- return null;
- }
-
- /**
- * Construct the name of the shard actor given the name of the member on
- * which the shard resides and the name of the shard
- *
- * @param memberName
- * @param shardName
- * @return
- */
- private ShardIdentifier getShardIdentifier(String memberName, String shardName){
- return ShardIdentifier.builder().memberName(memberName).shardName(shardName).type(type).build();
- }
-
- /**
- * Create shards that are local to the member on which the ShardManager
- * runs
- *
- */
- private void createLocalShards() {
- String memberName = this.cluster.getCurrentMemberName();
- List<String> memberShardNames =
- this.configuration.getMemberShardNames(memberName);
-
- List<String> localShardActorNames = new ArrayList<>();
- for(String shardName : memberShardNames){
- ShardIdentifier shardId = getShardIdentifier(memberName, shardName);
- Map<ShardIdentifier, String> peerAddresses = getPeerAddresses(shardName);
- localShardActorNames.add(shardId.toString());
- localShards.put(shardName, new ShardInformation(shardName, shardId, peerAddresses));
- }
-
- mBean = ShardManagerInfo.createShardManagerMBean("shard-manager-" + this.type,
- datastoreContext.getDataStoreMXBeanType(), localShardActorNames);
- }
-
- /**
- * Given the name of the shard find the addresses of all it's peers
- *
- * @param shardName
- * @return
- */
- private Map<ShardIdentifier, String> getPeerAddresses(String shardName){
-
- Map<ShardIdentifier, String> peerAddresses = new HashMap<>();
-
- List<String> members =
- this.configuration.getMembersFromShardName(shardName);
-
- String currentMemberName = this.cluster.getCurrentMemberName();
-
- for(String memberName : members){
- if(!currentMemberName.equals(memberName)){
- ShardIdentifier shardId = getShardIdentifier(memberName,
- shardName);
- String path =
- getShardActorPath(shardName, currentMemberName);
- peerAddresses.put(shardId, path);
- }
- }
- return peerAddresses;
- }
-
- @Override
- public SupervisorStrategy supervisorStrategy() {
-
- return new OneForOneStrategy(10, Duration.create("1 minute"),
- new Function<Throwable, SupervisorStrategy.Directive>() {
- @Override
- public SupervisorStrategy.Directive apply(Throwable t) {
- LOG.warn("Supervisor Strategy caught unexpected exception - resuming", t);
- return SupervisorStrategy.resume();
- }
- }
- );
-
- }
-
- @Override
- public String persistenceId() {
- return "shard-manager-" + type;
- }
-
- @VisibleForTesting
- Collection<String> getKnownModules() {
- return knownModules;
- }
-
- @VisibleForTesting
- DataPersistenceProvider getDataPersistenceProvider() {
- return dataPersistenceProvider;
- }
-
- private class ShardInformation {
- private final ShardIdentifier shardId;
- private final String shardName;
- private ActorRef actor;
- private ActorPath actorPath;
- private final Map<ShardIdentifier, String> peerAddresses;
-
- // flag that determines if the actor is ready for business
- private boolean actorInitialized = false;
-
- private final List<Runnable> runnablesOnInitialized = Lists.newArrayList();
-
- private ShardInformation(String shardName, ShardIdentifier shardId,
- Map<ShardIdentifier, String> peerAddresses) {
- this.shardName = shardName;
- this.shardId = shardId;
- this.peerAddresses = peerAddresses;
- }
-
- String getShardName() {
- return shardName;
- }
-
- ActorRef getActor(){
- return actor;
- }
-
- ActorPath getActorPath() {
- return actorPath;
- }
-
- void setActor(ActorRef actor) {
- this.actor = actor;
- this.actorPath = actor.path();
- }
-
- ShardIdentifier getShardId() {
- return shardId;
- }
-
- Map<ShardIdentifier, String> getPeerAddresses() {
- return peerAddresses;
- }
-
- void updatePeerAddress(ShardIdentifier peerId, String peerAddress){
- LOG.info("updatePeerAddress for peer {} with address {}", peerId,
- peerAddress);
- if(peerAddresses.containsKey(peerId)){
- peerAddresses.put(peerId, peerAddress);
-
- if(actor != null) {
- if(LOG.isDebugEnabled()) {
- LOG.debug("Sending PeerAddressResolved for peer {} with address {} to {}",
- peerId, peerAddress, actor.path());
- }
-
- actor.tell(new PeerAddressResolved(peerId, peerAddress), getSelf());
- }
- }
- }
-
- boolean isShardInitialized() {
- return getActor() != null && actorInitialized;
- }
-
- void setActorInitialized() {
- this.actorInitialized = true;
-
- for(Runnable runnable: runnablesOnInitialized) {
- runnable.run();
- }
-
- runnablesOnInitialized.clear();
- }
-
- void addRunnableOnInitialized(Runnable runnable) {
- runnablesOnInitialized.add(runnable);
- }
- }
-
- private static class ShardManagerCreator implements Creator<ShardManager> {
- private static final long serialVersionUID = 1L;
-
- final ClusterWrapper cluster;
- final Configuration configuration;
- final DatastoreContext datastoreContext;
-
- ShardManagerCreator(ClusterWrapper cluster,
- Configuration configuration, DatastoreContext datastoreContext) {
- this.cluster = cluster;
- this.configuration = configuration;
- this.datastoreContext = datastoreContext;
- }
-
- @Override
- public ShardManager create() throws Exception {
- return new ShardManager(cluster, configuration, datastoreContext);
- }
- }
-
- static class SchemaContextModules implements Serializable {