com.google.cloud.bigtable.grpc.scanner

Class RowMerger

java.lang.Object

com.google.cloud.bigtable.grpc.scanner.RowMerger

All Implemented Interfaces:

io.grpc.stub.StreamObserver<com.google.bigtable.v2.ReadRowsResponse>

@InternalApi(value="For internal usage only")
public class RowMerger
extends Object
implements io.grpc.stub.StreamObserver<com.google.bigtable.v2.ReadRowsResponse>

Builds a complete FlatRow from ReadRowsResponse objects. A ReadRowsResponse may contain a single FlatRow, multiple FlatRows, or even a part of a Cell if the cell is

Each RowMerger object is valid only for building a single FlatRow. Expected usage is along the lines of:

 StreamObserver<FlatRow> observer = ...;
 RowMerger rowMerger = new RowMerger(observer);
 ...
 rowMerger.onNext(...);
 ..
 rowMerger.onComplete();
 

When a complete row is found, StreamObserver.onNext(Object) will be called. StreamObserver.onError(Throwable) will be called for

NOTE: RowMerger is not threadsafe.

For internal use only - public for technical reasons.

Field Summary

Fields

Modifier and Type	Field and Description
protected static Logger	LOG

Constructor Summary

Constructors

Constructor and Description
RowMerger(io.grpc.stub.StreamObserver<FlatRow> observer) Constructor for RowMerger.

Method Summary

Modifier and Type	Method and Description
void	clearRowInProgress()
com.google.protobuf.ByteString	getLastCompletedRowKey()
Integer	getRowCountInLastMessage()
void	onCompleted()
void	onError(Throwable e)
void	onNext(com.google.bigtable.v2.ReadRowsResponse readRowsResponse)
static List<FlatRow>	toRows(Iterable<com.google.bigtable.v2.ReadRowsResponse> responses) toRows.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG

protected static final Logger LOG

Constructor Detail

RowMerger

public RowMerger(io.grpc.stub.StreamObserver<FlatRow> observer)

Constructor for RowMerger.

Parameters:

observer - a StreamObserver object.

Method Detail

toRows

public static List<FlatRow> toRows(Iterable<com.google.bigtable.v2.ReadRowsResponse> responses)

toRows.

Parameters:

responses - a Iterable object.

Returns:

a List object.

clearRowInProgress

public void clearRowInProgress()

onNext

public final void onNext(com.google.bigtable.v2.ReadRowsResponse readRowsResponse)

Specified by:

onNext in interface io.grpc.stub.StreamObserver<com.google.bigtable.v2.ReadRowsResponse>

getRowCountInLastMessage

public Integer getRowCountInLastMessage()

Returns:

the number of rows processed in the previous call to onNext(ReadRowsResponse).

getLastCompletedRowKey

public com.google.protobuf.ByteString getLastCompletedRowKey()

onCompleted

public void onCompleted()

All ReadRowsResponse have been processed, and HTTP OK was sent.

Specified by:

onCompleted in interface io.grpc.stub.StreamObserver<com.google.bigtable.v2.ReadRowsResponse>

onError

public void onError(Throwable e)

Specified by:

onError in interface io.grpc.stub.StreamObserver<com.google.bigtable.v2.ReadRowsResponse>