Working on the cluster i/o
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/MessageSerializer.java b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/MessageSerializer.java
new file mode 100644
index 0000000..93c8310
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/MessageSerializer.java
@@ -0,0 +1,69 @@
+package org.onlab.onos.store.cluster.messaging.impl;
+
+import org.onlab.onos.store.cluster.messaging.ClusterMessage;
+import org.onlab.onos.store.cluster.messaging.MessageSubject;
+import org.onlab.onos.store.cluster.messaging.SerializationService;
+
+import java.nio.ByteBuffer;
+
+import static com.google.common.base.Preconditions.checkState;
+
+/**
+ * Factory for parsing messages sent between cluster members.
+ */
+public class MessageSerializer implements SerializationService {
+
+ private static final int METADATA_LENGTH = 16; // 8 + 4 + 4
+ private static final int LENGTH_OFFSET = 12;
+
+ private static final long MARKER = 0xfeedcafebeaddeadL;
+
+ @Override
+ public ClusterMessage decode(ByteBuffer buffer) {
+ try {
+ // Do we have enough bytes to read the header? If not, bail.
+ if (buffer.remaining() < METADATA_LENGTH) {
+ return null;
+ }
+
+ // Peek at the length and if we have enough to read the entire message
+ // go ahead, otherwise bail.
+ int length = buffer.getInt(buffer.position() + LENGTH_OFFSET);
+ if (buffer.remaining() < length) {
+ return null;
+ }
+
+ // At this point, we have enough data to read a complete message.
+ long marker = buffer.getLong();
+ checkState(marker == MARKER, "Incorrect message marker");
+
+ int subjectOrdinal = buffer.getInt();
+ MessageSubject subject = MessageSubject.values()[subjectOrdinal];
+ length = buffer.getInt();
+
+ // TODO: sanity checking for length
+ byte[] data = new byte[length - METADATA_LENGTH];
+ buffer.get(data);
+
+ // TODO: add deserialization hook here; for now this hack
+ return null; // actually deserialize
+
+ } catch (Exception e) {
+ // TODO: recover from exceptions by forwarding stream to next marker
+ e.printStackTrace();
+ }
+ return null;
+ }
+
+ @Override
+ public void encode(ClusterMessage message, ByteBuffer buffer) {
+ try {
+ int i = 0;
+ // Type based lookup for proper encoder
+ } catch (Exception e) {
+ // TODO: recover from exceptions by forwarding stream to next marker
+ e.printStackTrace();
+ }
+ }
+
+}