package org.opendaylight.controller.cluster.example;
+import akka.actor.ActorRef;
+import akka.actor.Props;
+import akka.japi.Creator;
+import com.google.common.base.Optional;
+import com.google.protobuf.ByteString;
+import org.opendaylight.controller.cluster.example.messages.KeyValue;
+import org.opendaylight.controller.cluster.example.messages.KeyValueSaved;
+import org.opendaylight.controller.cluster.example.messages.PrintRole;
+import org.opendaylight.controller.cluster.example.messages.PrintState;
+import org.opendaylight.controller.cluster.raft.ConfigParams;
import org.opendaylight.controller.cluster.raft.RaftActor;
+import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
+import org.opendaylight.controller.cluster.raft.protobuff.client.messages.Payload;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.HashMap;
+import java.util.Map;
/**
* A sample actor showing how the RaftActor is to be extended
*/
public class ExampleActor extends RaftActor {
- public ExampleActor(String id) {
- super(id);
+
+ private final Map<String, String> state = new HashMap();
+
+ private long persistIdentifier = 1;
+
+
+ public ExampleActor(String id, Map<String, String> peerAddresses,
+ Optional<ConfigParams> configParams) {
+ super(id, peerAddresses, configParams);
+ }
+
+ public static Props props(final String id, final Map<String, String> peerAddresses,
+ final Optional<ConfigParams> configParams){
+ return Props.create(new Creator<ExampleActor>(){
+
+ @Override public ExampleActor create() throws Exception {
+ return new ExampleActor(id, peerAddresses, configParams);
+ }
+ });
}
@Override public void onReceiveCommand(Object message){
- /*
- Here the extended class does whatever it needs to do.
- If it cannot handle a message then it passes it on to the super
- class for handling
- */
- super.onReceiveCommand(message);
+ if(message instanceof KeyValue){
+ if(isLeader()) {
+ String persistId = Long.toString(persistIdentifier++);
+ persistData(getSender(), persistId, (Payload) message);
+ } else {
+ if(getLeader() != null) {
+ getLeader().forward(message, getContext());
+ }
+ }
+
+ } else if (message instanceof PrintState) {
+ LOG.debug("State of the node:{} has entries={}, {}",
+ getId(), state.size(), getReplicatedLogState());
+
+ } else if (message instanceof PrintRole) {
+ LOG.debug("{} = {}, Peers={}", getId(), getRaftState(),getPeers());
+
+ } else {
+ super.onReceiveCommand(message);
+ }
+ }
+
+ @Override protected void applyState(ActorRef clientActor, String identifier,
+ Object data) {
+ if(data instanceof KeyValue){
+ KeyValue kv = (KeyValue) data;
+ state.put(kv.getKey(), kv.getValue());
+ if(clientActor != null) {
+ clientActor.tell(new KeyValueSaved(), getSelf());
+ }
+ }
+ }
+
+ @Override protected void createSnapshot() {
+ ByteString bs = null;
+ try {
+ bs = fromObject(state);
+ } catch (Exception e) {
+ LOG.error("Exception in creating snapshot", e);
+ }
+ getSelf().tell(new CaptureSnapshotReply(bs), null);
+ }
+
+ @Override protected void applySnapshot(ByteString snapshot) {
+ state.clear();
+ try {
+ state.putAll((HashMap) toObject(snapshot));
+ } catch (Exception e) {
+ LOG.error("Exception in applying snapshot", e);
+ }
+ LOG.debug("Snapshot applied to state :" + ((HashMap) state).size());
+ }
+
+ private ByteString fromObject(Object snapshot) throws Exception {
+ ByteArrayOutputStream b = null;
+ ObjectOutputStream o = null;
+ try {
+ b = new ByteArrayOutputStream();
+ o = new ObjectOutputStream(b);
+ o.writeObject(snapshot);
+ byte[] snapshotBytes = b.toByteArray();
+ return ByteString.copyFrom(snapshotBytes);
+ } finally {
+ if (o != null) {
+ o.flush();
+ o.close();
+ }
+ if (b != null) {
+ b.close();
+ }
+ }
+ }
+
+ private Object toObject(ByteString bs) throws ClassNotFoundException, IOException {
+ Object obj = null;
+ ByteArrayInputStream bis = null;
+ ObjectInputStream ois = null;
+ try {
+ bis = new ByteArrayInputStream(bs.toByteArray());
+ ois = new ObjectInputStream(bis);
+ obj = ois.readObject();
+ } finally {
+ if (bis != null) {
+ bis.close();
+ }
+ if (ois != null) {
+ ois.close();
+ }
+ }
+ return obj;
+ }
+
+ @Override protected void onStateChanged() {
+
}
@Override public void onReceiveRecover(Object message) {
super.onReceiveRecover(message);
}
+ @Override public String persistenceId() {
+ return getId();
+ }
}