Exposes the millisBehindCurrent metric to V1 IRecordProcessor implementations.

src/main/java/com/amazonaws/services/kinesis/clientlibrary/interfaces/IRecordProcessor.java

@@ -41,8 +41,10 @@ public interface IRecordProcessor {
      * 
      * @param records Data records to be processed
      * @param checkpointer RecordProcessor should use this instance to checkpoint their progress.
+     * @param millisBehindLatest indicates how many milliseconds the underlying iterator is behind from the latest record
+     *        in the shard.
      */
-    void processRecords(List<Record> records, IRecordProcessorCheckpointer checkpointer);
+    void processRecords(List<Record> records, IRecordProcessorCheckpointer checkpointer, Long millisBehindLatest);
 
     /**
      * Invoked by the Amazon Kinesis Client Library to indicate it will no longer send data records to this

src/main/java/com/amazonaws/services/kinesis/clientlibrary/lib/worker/V1ToV2RecordProcessorAdapter.java

@@ -39,8 +39,8 @@ class V1ToV2RecordProcessorAdapter implements IRecordProcessor {
 
     @Override
     public void processRecords(ProcessRecordsInput processRecordsInput) {
-        recordProcessor.processRecords(processRecordsInput.getRecords(), processRecordsInput.getCheckpointer());
+        recordProcessor.processRecords(processRecordsInput.getRecords(), processRecordsInput.getCheckpointer(),
-        
+            processRecordsInput.getMillisBehindLatest());
     }
 
     @Override

src/main/java/com/amazonaws/services/kinesis/multilang/messages/InitializeMessage.java

@@ -45,7 +45,7 @@ public class InitializeMessage extends Message {
     /**
      * Convenience constructor.
      * 
-     * @param shardId The shard id.
+     * @param initializationInput The shard id and extended sequence number.
      */
     public InitializeMessage(InitializationInput initializationInput) {
         this.shardId = initializationInput.getShardId();

src/test/java/com/amazonaws/services/kinesis/clientlibrary/lib/worker/WorkerTest.java

@@ -175,7 +175,8 @@ public class WorkerTest {
                 }
 
                 @Override
-                public void processRecords(List<Record> dataRecords, IRecordProcessorCheckpointer checkpointer) {
+                public void processRecords(List<Record> dataRecords, IRecordProcessorCheckpointer checkpointer,
+                    Long millisBehindLatest) {
                     try {
                         checkpointer.checkpoint();
                     } catch (KinesisClientLibNonRetryableException e) {