org.apache.storm.redis.trident.state

Class AbstractRedisStateUpdater<T extends State>

java.lang.Object

org.apache.storm.trident.operation.BaseOperation

org.apache.storm.trident.state.BaseStateUpdater<T>

org.apache.storm.redis.trident.state.AbstractRedisStateUpdater<T>

Type Parameters:

T - type of State

All Implemented Interfaces:

Serializable, Operation, StateUpdater<T>

Direct Known Subclasses:

RedisClusterStateUpdater, RedisStateUpdater

public abstract class AbstractRedisStateUpdater<T extends State>
extends BaseStateUpdater<T>

AbstractRedisStateUpdater is base class of any RedisStateUpdater, which implements BaseStateUpdater.

Derived classes should provide how to update (key, value) pairs to Redis, and AbstractRedisStateUpdater takes care of rest things.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected String	additionalKey
protected RedisDataTypeDescription.RedisDataType	dataType
protected int	expireIntervalSec

Constructor Summary

Constructors

Constructor and Description
AbstractRedisStateUpdater(RedisStoreMapper storeMapper) Constructor.

Method Summary

Modifier and Type	Method and Description
void	setExpireInterval(int expireIntervalSec) Sets expire (time to live) if needed.
void	updateState(T state, List<TridentTuple> inputs, TridentCollector collector)
protected abstract void	updateStatesToRedis(T state, Map<String,String> keyToValue) Updates (key, value) pairs to Redis.

Methods inherited from class org.apache.storm.trident.operation.BaseOperation

cleanup, prepare

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.storm.trident.operation.Operation

cleanup, prepare

Field Detail

dataType

protected final RedisDataTypeDescription.RedisDataType dataType

additionalKey

protected final String additionalKey

expireIntervalSec

protected int expireIntervalSec

Constructor Detail

AbstractRedisStateUpdater

public AbstractRedisStateUpdater(RedisStoreMapper storeMapper)

Constructor.

Parameters:

storeMapper - mapper for storing

Method Detail

setExpireInterval

public void setExpireInterval(int expireIntervalSec)

Sets expire (time to live) if needed.

Parameters:

expireIntervalSec - time to live in seconds

updateState

public void updateState(T state,
                        List<TridentTuple> inputs,
                        TridentCollector collector)

updateStatesToRedis

protected abstract void updateStatesToRedis(T state,
                                            Map<String,String> keyToValue)

Updates (key, value) pairs to Redis.

Parameters:

state - State for handling query

keyToValue - (key, value) pairs