org.apache.samza.storage.kv

Class RocksDbKeyValueReader

java.lang.Object

org.apache.samza.storage.kv.RocksDbKeyValueReader

public class RocksDbKeyValueReader
extends java.lang.Object

This class is to read the RocksDb according to the provided directory position

Constructor Summary

Constructors

Constructor and Description
RocksDbKeyValueReader(java.lang.String storeName, java.lang.String dbPath, org.apache.samza.config.Config config) Construct the RocksDbKeyValueReader with store's name, database's path and Samza's config

Method Summary

Modifier and Type	Method and Description
java.lang.Object	get(java.lang.Object key) get the value from the key.
void	stop()

Methods inherited from class java.lang.Object

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

Constructor Detail

RocksDbKeyValueReader

public RocksDbKeyValueReader(java.lang.String storeName,
                             java.lang.String dbPath,
                             org.apache.samza.config.Config config)

Construct the RocksDbKeyValueReader with store's name, database's path and Samza's config

Parameters:

storeName - name of the RocksDb defined in the config file

dbPath - path to the db directory

config - Samza's config

Method Detail

get

public java.lang.Object get(java.lang.Object key)

get the value from the key. This key will be serialized to bytes using the serde defined in systems.system-name.samza.key.serde. The result will be deserialized back to the object using the serde in systems.system-name.samza.msg.serde. If the value does not exist in the db, it return null.

Parameters:

key - the key of the value you want to get

Returns:

deserialized value for the key Returns null, if the value doesn't exist

stop

public void stop()