org.kitesdk.morphline.base
Class AbstractCommand

java.lang.Object
  org.kitesdk.morphline.base.AbstractCommand

All Implemented Interfaces:

Command

Direct Known Subclasses:

AbstractFieldTransformCommand, AbstractParser

public abstract class AbstractCommand
extends Object
implements Command

Base class for convenient implementation of Command classes.

Field Summary

protected org.slf4j.Logger

LOG

Constructor Summary

protected	AbstractCommand(CommandBuilder builder, com.typesafe.config.Config config, Command parent, Command child, MorphlineContext context) Using the given builder, constructs a command rooted at the given morphline JSON config.
protected	AbstractCommand(com.typesafe.config.Config config, Command parent, Command child, MorphlineContext context) Deprecated.

Method Summary

protected Command	buildCommand(com.typesafe.config.Config cmdConfig, Command currentParent, Command finalChild) Factory method to create a command rooted at the given cmdConfig.
protected List<Command>	buildCommandChain(com.typesafe.config.Config rootConfig, String configKey, Command finalChild, boolean ignoreNotifications) Factory method to create the chain of commands rooted at the given rootConfig.
protected void	doNotify(Record notification) Processes the given notification on the control plane of the subtree rooted at this command.
protected boolean	doProcess(Record record) Processes the given record on the data plane of this command.
protected Command	getChild() Returns the child of this command.
protected com.typesafe.config.Config	getConfig() Returns the JSON configuration of this command.
protected Configs	getConfigs() Returns a helper for convenient access to the JSON configuration of this command.
protected MorphlineContext	getContext() Returns the context of this command.
protected com.codahale.metrics.Counter	getCounter(String... names) Returns a counter for maintaining main-memory metrics.
protected com.codahale.metrics.Histogram	getHistogram(String... names) Returns a histogram for maintaining main-memory metrics.
protected com.codahale.metrics.Meter	getMeter(String... names) Returns a meter for maintaining main-memory metrics.
Command	getParent() Returns the parent of this command.
protected com.codahale.metrics.Timer	getTimer(String... names) Returns a timer for maintaining main-memory metrics.
protected boolean	isMeasuringMetrics() Returns whether or not metrics should be measured.
void	notify(Record notification) Processes the given notification on the control plane of the subtree rooted at this command.
boolean	process(Record record) Processes the given record on the data plane of this command.
protected void	validateArguments() Helper that checks if the user provided configuration parameters are valid.

Methods inherited from class java.lang.Object

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

Field Detail

LOG

protected final org.slf4j.Logger LOG

Constructor Detail

AbstractCommand

protected AbstractCommand(CommandBuilder builder,
                          com.typesafe.config.Config config,
                          Command parent,
                          Command child,
                          MorphlineContext context)

Using the given builder, constructs a command rooted at the given morphline JSON config. The command will feed records into child. The command will have parent as it's parent. Additional parameters can be passed via the morphline context.

AbstractCommand

@Deprecated
protected AbstractCommand(com.typesafe.config.Config config,
                                     Command parent,
                                     Command child,
                                     MorphlineContext context)

Deprecated.

Deprecated; will be removed in the next release

Method Detail

getParent

public Command getParent()

Description copied from interface: Command

Returns the parent of this command. The parent of a command A is the command B that passes records to A. A is the child of B.

Specified by:

getParent in interface Command

getChild

protected Command getChild()

Returns the child of this command. The parent of a command A is the command B that passes records to A. A is the child of B.

getConfig

protected com.typesafe.config.Config getConfig()

Returns the JSON configuration of this command.

getContext

protected MorphlineContext getContext()

Returns the context of this command.

getConfigs

protected Configs getConfigs()

Returns a helper for convenient access to the JSON configuration of this command.

notify

public final void notify(Record notification)

Description copied from interface: Command

Processes the given notification on the control plane of the subtree rooted at this command.

Specified by:

notify in interface Command

doNotify

protected void doNotify(Record notification)

Processes the given notification on the control plane of the subtree rooted at this command.

process

public final boolean process(Record record)

Description copied from interface: Command

Processes the given record on the data plane of this command.

Specified by:

process in interface Command

Returns:

true to indicate that processing shall continue, false to indicate that backtracking shall be done

doProcess

protected boolean doProcess(Record record)

Processes the given record on the data plane of this command.

Returns:

true to indicate that processing shall continue, false to indicate that backtracking shall be done

validateArguments

protected void validateArguments()

Helper that checks if the user provided configuration parameters are valid.

getCounter

protected com.codahale.metrics.Counter getCounter(String... names)

Returns a counter for maintaining main-memory metrics.

getHistogram

protected com.codahale.metrics.Histogram getHistogram(String... names)

Returns a histogram for maintaining main-memory metrics.

getMeter

protected com.codahale.metrics.Meter getMeter(String... names)

Returns a meter for maintaining main-memory metrics.

getTimer

protected com.codahale.metrics.Timer getTimer(String... names)

Returns a timer for maintaining main-memory metrics.

isMeasuringMetrics

protected final boolean isMeasuringMetrics()

Returns whether or not metrics should be measured.

buildCommandChain

protected List<Command> buildCommandChain(com.typesafe.config.Config rootConfig,
                                          String configKey,
                                          Command finalChild,
                                          boolean ignoreNotifications)

Factory method to create the chain of commands rooted at the given rootConfig. The last command in the chain will feed records into finalChild.

Parameters:

ignoreNotifications - if true indicates don't forward notifications at the end of the chain of commands. This is a feature that multi-branch commands like tryRules and ifThenElse need to avoid sending a notification multiple times to finalChild, once from each branch.

buildCommand

protected Command buildCommand(com.typesafe.config.Config cmdConfig,
                               Command currentParent,
                               Command finalChild)

Factory method to create a command rooted at the given cmdConfig. The command will feed records into finalChild. The command will have currentParent as it's parent.