org.apache.storm.mongodb.bolt

Class AbstractMongoBolt

java.lang.Object

org.apache.storm.topology.base.BaseComponent

org.apache.storm.topology.base.BaseRichBolt

org.apache.storm.mongodb.bolt.AbstractMongoBolt

All Implemented Interfaces:

Serializable, IBolt, IComponent, IRichBolt

Direct Known Subclasses:

MongoInsertBolt, MongoLookupBolt, MongoUpdateBolt

public abstract class AbstractMongoBolt
extends BaseRichBolt

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected OutputCollector	collector
protected MongoDbClient	mongoClient

Constructor Summary

Constructors

Constructor and Description
AbstractMongoBolt(String url, String collectionName) AbstractMongoBolt Constructor.

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 context, 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 OutputCollector collector

mongoClient

protected MongoDbClient mongoClient

Constructor Detail

AbstractMongoBolt

public AbstractMongoBolt(String url,
                         String collectionName)

AbstractMongoBolt Constructor.

Parameters:

url - The MongoDB server url

collectionName - The collection where reading/writing data

Method Detail

prepare

public void prepare(Map<String,Object> topoConf,
                    TopologyContext context,
                    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.

context - 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