org.apache.storm.hbase.bolt

Class AbstractHBaseBolt

java.lang.Object

org.apache.storm.topology.base.BaseComponent

org.apache.storm.topology.base.BaseRichBolt

org.apache.storm.hbase.bolt.AbstractHBaseBolt

All Implemented Interfaces:

Serializable, IBolt, IComponent, IRichBolt

Direct Known Subclasses:

HBaseBolt, HBaseLookupBolt

public abstract class AbstractHBaseBolt
extends BaseRichBolt

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected OutputCollector	collector
protected String	configKey
protected HBaseClient	hBaseClient
protected HBaseMapper	mapper
protected String	tableName

Constructor Summary

Constructors

Constructor and Description
AbstractHBaseBolt(String tableName, HBaseMapper mapper)

Method Summary

Modifier and Type	Method and Description
void	cleanup() Called when an IBolt is going to be shutdown.
void	prepare(Map<String,Object> topoConf, TopologyContext topologyContext, OutputCollector collector) Called when a task for this component is initialized within a worker on the cluster.

Methods inherited from class org.apache.storm.topology.base.BaseComponent

getComponentConfiguration

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.task.IBolt

execute

Methods inherited from interface org.apache.storm.topology.IComponent

declareOutputFields, getComponentConfiguration

Field Detail

collector

protected transient OutputCollector collector

hBaseClient

protected transient HBaseClient hBaseClient

tableName

protected String tableName

mapper

protected HBaseMapper mapper

configKey

protected String configKey

Constructor Detail

AbstractHBaseBolt

public AbstractHBaseBolt(String tableName,
                         HBaseMapper mapper)

Method Detail

prepare

public void prepare(Map<String,Object> topoConf,
                    TopologyContext topologyContext,
                    OutputCollector collector)

Description copied from interface: IBolt

Called when a task for this component is initialized within a worker on the cluster. It provides the bolt with the environment in which the bolt executes.

This includes the:

Parameters:

topoConf - The Storm configuration for this bolt. This is the configuration provided to the topology merged in with cluster configuration on this machine.

topologyContext - This object can be used to get information about this task’s place within the topology, including the task id and component id of this task, input and output information, etc.

collector - The collector is used to emit tuples from this bolt. Tuples can be emitted at any time, including the prepare and cleanup methods. The collector is thread-safe and should be saved as an instance variable of this bolt object.

cleanup

public void cleanup()

Description copied from interface: IBolt

Called when an IBolt is going to be shutdown. Storm will make a best-effort attempt to call this if the worker shutdown is orderly. The Config.SUPERVISOR_WORKER_SHUTDOWN_SLEEP_SECS setting controls how long orderly shutdown is allowed to take. There is no guarantee that cleanup will be called if shutdown is not orderly, or if the shutdown exceeds the time limit.

The one context where cleanup is guaranteed to be called is when a topology is killed when running Storm in local mode.

Specified by:

cleanup in interface IBolt

Overrides:

cleanup in class BaseRichBolt