cz.o2.proxima.direct.core

Interface BulkAttributeWriter

All Superinterfaces:

AttributeWriterBase, java.lang.AutoCloseable

All Known Implementing Classes:

AbstractBulkAttributeWriter

@Stable
public interface BulkAttributeWriter
extends AttributeWriterBase

Writer for attribute values. This is online version, where each element is committed one after another.

The ingest process works as follows:

• incoming request is written into CommitLog, which is instance of this interface
• the message is confirmed to the client, because commit log is persistent, durable and distributed
• next, the message is asynchronously consumed by all writes from the commit log and written to the storages

Note that as a commit log might be marked any "regular" storage of the message. If so, the message is not written to the commit log twice.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	BulkAttributeWriter.Factory<T extends BulkAttributeWriter> Serializable factory for BulkAttributeWriter.

Nested classes/interfaces inherited from interface cz.o2.proxima.direct.core.AttributeWriterBase

AttributeWriterBase.Type

Method Summary

Modifier and Type	Method and Description
BulkAttributeWriter.Factory<?>	asFactory() Convert instance of this writer to AttributeWriterBase.Factory suitable for serialization.
default AttributeWriterBase.Type	getType() Retrieve type of the writer.
default void	updateWatermark(long watermark) Update watermark when no input data arrives.
void	write(StreamElement data, long watermark, CommitCallback statusCallback) Write given serialized attribute value to given entity.

Methods inherited from interface cz.o2.proxima.direct.core.AttributeWriterBase

bulk, close, getUri, online, rollback

Method Detail

getType

default AttributeWriterBase.Type getType()

Description copied from interface: AttributeWriterBase

Retrieve type of the writer.

Specified by:

getType in interface AttributeWriterBase

Returns:

AttributeWriterBase.Type of the writer

write

void write(StreamElement data,
           long watermark,
           CommitCallback statusCallback)

Write given serialized attribute value to given entity. Use the statusCallback to commit the whole bulk (of not yet committed elements).

Parameters:

data - the data to writer

watermark - watermark of data being written

statusCallback - callback to commit the data

updateWatermark

default void updateWatermark(long watermark)

Update watermark when no input data arrives.

Parameters:

watermark - timestamp of the new watermark

asFactory

BulkAttributeWriter.Factory<?> asFactory()

Description copied from interface: AttributeWriterBase

Convert instance of this writer to AttributeWriterBase.Factory suitable for serialization.

Specified by:

asFactory in interface AttributeWriterBase

Returns:

the AttributeWriterBase.Factory representing this reader