Package com.digitalpebble.stormcrawler.spout

Class FileSpout

java.lang.Object

org.apache.storm.topology.base.BaseComponent

org.apache.storm.topology.base.BaseRichSpout

com.digitalpebble.stormcrawler.spout.FileSpout

All Implemented Interfaces:

Serializable, org.apache.storm.spout.ISpout, org.apache.storm.topology.IComponent, org.apache.storm.topology.IRichSpout

public class FileSpout
extends org.apache.storm.topology.base.BaseRichSpout

Reads the lines from a UTF-8 file and use them as a spout. Load the entire content into memory. Uses StringTabScheme to parse the lines into URLs and Metadata, generates tuples on the default stream unless withDiscoveredStatus is set to true.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected org.apache.storm.spout.SpoutOutputCollector	_collector
protected org.apache.storm.spout.Scheme	_scheme
protected boolean	active
static int	BATCH_SIZE
protected LinkedList<byte[]>	buffer
static org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor	Description
FileSpout(boolean withDiscoveredStatus, String... files)
FileSpout(String... files)
FileSpout(String dir, String filter)
FileSpout(String dir, String filter, boolean withDiscoveredStatus)

Method Summary

Modifier and Type	Method	Description
void	ack(Object msgId)
void	activate()
void	close()
void	deactivate()
void	declareOutputFields(org.apache.storm.topology.OutputFieldsDeclarer declarer)
void	fail(Object msgId)
void	nextTuple()
void	open(Map<String,Object> conf, org.apache.storm.task.TopologyContext context, org.apache.storm.spout.SpoutOutputCollector collector)
protected void	populateBuffer()
void	setScheme(org.apache.storm.spout.Scheme scheme)	Specify a Scheme for parsing the lines into URLs and Metadata.

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.topology.IComponent

getComponentConfiguration

Field Detail

BATCH_SIZE

public static final int BATCH_SIZE

See Also:

Constant Field Values

LOG

public static final org.slf4j.Logger LOG

_collector

protected org.apache.storm.spout.SpoutOutputCollector _collector

_scheme

protected org.apache.storm.spout.Scheme _scheme

buffer

protected LinkedList<byte[]> buffer

active

protected boolean active

Constructor Detail

FileSpout

public FileSpout(String dir,
                 String filter)

Parameters:

dir - containing the seed files

filter - to apply on the file names

FileSpout

public FileSpout(String... files)

Parameters:

files - containing the URLs

FileSpout

public FileSpout(String dir,
                 String filter,
                 boolean withDiscoveredStatus)

Parameters:

withDiscoveredStatus - whether the tuples generated should contain a Status field with DISCOVERED as value and be emitted on the status stream

dir - containing the seed files

filter - to apply on the file names

Since:

1.13

FileSpout

public FileSpout(boolean withDiscoveredStatus,
                 String... files)

Parameters:

withDiscoveredStatus - whether the tuples generated should contain a Status field with DISCOVERED as value and be emitted on the status stream

files - containing the URLs

Since:

1.13

Method Detail

setScheme

public void setScheme(org.apache.storm.spout.Scheme scheme)

Specify a Scheme for parsing the lines into URLs and Metadata. StringTabScheme is used by default. The Scheme must generate a String for the URL and a Metadata object.

Since:

1.13

populateBuffer

protected void populateBuffer()
                       throws IOException

Throws:

IOException

open

public void open(Map<String,Object> conf,
                 org.apache.storm.task.TopologyContext context,
                 org.apache.storm.spout.SpoutOutputCollector collector)

nextTuple

public void nextTuple()

declareOutputFields

public void declareOutputFields(org.apache.storm.topology.OutputFieldsDeclarer declarer)

close

public void close()

Specified by:

close in interface org.apache.storm.spout.ISpout

Overrides:

close in class org.apache.storm.topology.base.BaseRichSpout

activate

public void activate()

Specified by:

activate in interface org.apache.storm.spout.ISpout

Overrides:

activate in class org.apache.storm.topology.base.BaseRichSpout

deactivate

public void deactivate()

Specified by:

deactivate in interface org.apache.storm.spout.ISpout

Overrides:

deactivate in class org.apache.storm.topology.base.BaseRichSpout

ack

public void ack(Object msgId)

Specified by:

ack in interface org.apache.storm.spout.ISpout

Overrides:

ack in class org.apache.storm.topology.base.BaseRichSpout

fail

public void fail(Object msgId)

Specified by:

fail in interface org.apache.storm.spout.ISpout

Overrides:

fail in class org.apache.storm.topology.base.BaseRichSpout