org.apache.storm.redis.trident.state

Class AbstractRedisStateQuerier<T extends State>

java.lang.Object

org.apache.storm.trident.operation.BaseOperation

org.apache.storm.trident.state.BaseQueryFunction<T,List<Values>>

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

Type Parameters:

T - type of State

All Implemented Interfaces:

Serializable, EachOperation, Operation, QueryFunction<T,List<Values>>

Direct Known Subclasses:

RedisClusterStateQuerier, RedisStateQuerier

public abstract class AbstractRedisStateQuerier<T extends State>
extends BaseQueryFunction<T,List<Values>>

AbstractRedisStateQuerier is base class of any RedisStateQuerier, which implements BaseQueryFunction.

Derived classes should provide how to retrieve values from Redis, and AbstractRedisStateQuerier 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

Constructor Summary

Constructors

Constructor and Description
AbstractRedisStateQuerier(RedisLookupMapper lookupMapper) Constructor.

Method Summary

Modifier and Type	Method and Description
List<List<Values>>	batchRetrieve(T state, List<TridentTuple> inputs)
void	execute(TridentTuple tuple, List<Values> values, TridentCollector collector)
protected abstract List<String>	retrieveValuesFromRedis(T state, List<String> keys) Retrieves values from Redis that each value is corresponding to each key.

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

Constructor Detail

AbstractRedisStateQuerier

public AbstractRedisStateQuerier(RedisLookupMapper lookupMapper)

Constructor.

Parameters:

lookupMapper - mapper for querying

Method Detail

batchRetrieve

public List<List<Values>> batchRetrieve(T state,
                                        List<TridentTuple> inputs)

execute

public void execute(TridentTuple tuple,
                    List<Values> values,
                    TridentCollector collector)

retrieveValuesFromRedis

protected abstract List<String> retrieveValuesFromRedis(T state,
                                                        List<String> keys)

Retrieves values from Redis that each value is corresponding to each key.

Parameters:

state - State for handling query

keys - keys having state values

Returns:

values which are corresponding to keys