com.googlecode.fascinator.common.transaction

Class GenericTransactionManager

java.lang.Object

com.googlecode.fascinator.common.transaction.GenericTransactionManager

All Implemented Interfaces:

Plugin, TransactionManager

public abstract class GenericTransactionManager
extends Object
implements TransactionManager

A transaction manager will parse incoming JSON messages and inform the TransactionManagerQueueConsumer which Transformers, Subscribers, Indexing and Messaging sould occur in response.

Implementations of this Plugin are expected to execute inside the TransactionManagerQueueConsumer and should confirm to the expected message formats, as per documentation.

Author:

Greg Pendlebury

Constructor Summary

Constructors

Constructor and Description
GenericTransactionManager(String id, String name) Constructor, standard for plugins

Method Summary

Methods

Modifier and Type	Method and Description
String	getId() Gets an identifier for Harvester plugin
JsonSimpleConfig	getJsonConfig() Get config file
String	getName() Get a name for Harvester plugin
PluginDescription	getPluginDetails() Gets a PluginDescription object relating to this plugin.
abstract void	init() Abstract method for Harvester plugin
void	init(File jsonFile) Initialises the plugin using the specified JSON configuration
void	init(String jsonString) Initialises the plugin using the specified JSON String
abstract JsonSimple	parseMessage(JsonSimple message) This method is expected to be overwritten by implementations.
Object	parseMessage(Object message) This wrapper implements the API and enforces the practical requirement that the I/O Objects are appropriate JSON classes.
void	shutdown() Shuts down the plugin

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericTransactionManager

public GenericTransactionManager(String id,
                         String name)

Constructor, standard for plugins

Parameters:

id - Plugin Id

name - Plugin Name

Method Detail

getId

public String getId()

Gets an identifier for Harvester plugin

Specified by:

getId in interface Plugin

Returns:

the plugin type id

getName

public String getName()

Get a name for Harvester plugin

Specified by:

getName in interface Plugin

Returns:

the plugin name

getPluginDetails

public PluginDescription getPluginDetails()

Gets a PluginDescription object relating to this plugin.

Specified by:

getPluginDetails in interface Plugin

Returns:

a PluginDescription

init

public void init(File jsonFile)
          throws PluginException

Initialises the plugin using the specified JSON configuration

Specified by:

init in interface Plugin

Parameters:

jsonFile - JSON configuration file

Throws:

PluginException - if there was an error during initialisation

init

public void init(String jsonString)
          throws PluginException

Initialises the plugin using the specified JSON String

Specified by:

init in interface Plugin

Parameters:

jsonFile - JSON configuration file

Throws:

PluginException - if there was an error during initialisation

init

public abstract void init()
                   throws TransactionException

Abstract method for Harvester plugin

Throws:

HarvesterException - if there was an error during initialisation

TransactionException

shutdown

public void shutdown()
              throws PluginException

Shuts down the plugin

Specified by:

shutdown in interface Plugin

Throws:

PluginException - if there was an error during shutdown

getJsonConfig

public JsonSimpleConfig getJsonConfig()
                               throws TransactionException

Get config file

Returns:

config file

Throws:

HarvesterException - if there was an error during retrieval

TransactionException

parseMessage

public final Object parseMessage(Object message)
                          throws TransactionException

This wrapper implements the API and enforces the practical requirement that the I/O Objects are appropriate JSON classes.

Implementations should overwrite the correctly typed method.

Specified by:

parseMessage in interface TransactionManager

Parameters:

message - The message to parse, in JSON

Returns:

Object The actions to take in response, in JSON

Throws:

TransactionException - If an error occurred or the the message is in a bad format or otherwise unsuitable.

parseMessage

public abstract JsonSimple parseMessage(JsonSimple message)
                                 throws TransactionException

This method is expected to be overwritten by implementations. This is where the real processing should occur.

Parameters:

message - The JsonSimple message to process

Returns:

JsonSimple The actions to take in response

Throws:

TransactionException - If an error occurred