org.marketcetera.modules.cep.system

Class CEPSystemProcessor

java.lang.Object

org.marketcetera.module.Module

org.marketcetera.modules.cep.system.CEPSystemProcessor

All Implemented Interfaces:

DataEmitter, DataReceiver

public class CEPSystemProcessor
extends Module
implements DataReceiver, DataEmitter

Simple straight-through implementation of the CEP module that filters received data and only emits data that match the type specified in the query. Only allows for "select * from type_name" type of queries. The type_name can be any alias listed in CEPDataTypes or any valid Java class name

Module Features

Capabilities	Data Emitter, Data Receiver
DataFlow Request Parameters	String: The CEP query
Stops data flows	No
Start Operation	Does nothing
Stop Operation	Does nothing
Management Interface	None
Factory	CEPSystemFactory

The maps in the data structure are as follows:

• mTypeLookupMap is a mapping of all expected types to underlying classes (ie string --> class) for the purposes of doing the 'select * from alias' query
• mRequestMap - map of RequestID --> pair of {class, DataEmitterSupport}. Given a requestID, we can get the class and corresponding emitter registered to listen on that type. For cancels, we pull out all the classes, and remove the emitter subscribed to listen on that event type

Since:

1.0.0

Version:

$Id: CEPSystemProcessor.java 16841 2014-02-20 19:59:04Z colin $

Author:

anshul@marketcetera.com

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CEPSystemProcessor(ModuleURN inURN, boolean inAutoStart)

Method Summary

Methods

Modifier and Type	Method and Description
void	cancel(DataFlowID inFlowID, RequestID inRequestID) Find the request, and go through all its types and remove all the DataEmitterSupport object associated with it
protected Class<?>	getClassForRequest(String className) Checks to see if we are looking at an alias or a fully-qualified class name.
protected void	preStart()
protected void	preStop()
void	receiveData(DataFlowID inFlowID, Object inData) Map the incoming data to some type, find the list of all DataEmitterSupport objects and send the data on its way there Ignore the flowID This is a very inefficient implementation - just iterate over all known requests and if we find a match send the data that way
void	requestData(DataRequest inRequest, DataEmitterSupport inSupport)

Methods inherited from class org.marketcetera.module.Module

getCreated, getLastStartFailure, getLastStopFailure, getStarted, getState, getStopped, getURN, isAutoCreated, isAutoStart

Methods inherited from class java.lang.Object

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

Constructor Detail

CEPSystemProcessor

protected CEPSystemProcessor(ModuleURN inURN,
                  boolean inAutoStart)

Method Detail

preStart

protected void preStart()
                 throws ModuleException

Specified by:

preStart in class Module

Throws:

ModuleException

preStop

protected void preStop()
                throws ModuleException

Specified by:

preStop in class Module

Throws:

ModuleException

receiveData

public void receiveData(DataFlowID inFlowID,
               Object inData)
                 throws ReceiveDataException

Map the incoming data to some type, find the list of all DataEmitterSupport objects and send the data on its way there Ignore the flowID This is a very inefficient implementation - just iterate over all known requests and if we find a match send the data that way

Specified by:

receiveData in interface DataReceiver

Throws:

ReceiveDataException

requestData

public void requestData(DataRequest inRequest,
               DataEmitterSupport inSupport)
                 throws RequestDataException

Specified by:

requestData in interface DataEmitter

Throws:

RequestDataException

cancel

public void cancel(DataFlowID inFlowID,
          RequestID inRequestID)

Find the request, and go through all its types and remove all the DataEmitterSupport object associated with it

Specified by:

cancel in interface DataEmitter

getClassForRequest

protected Class<?> getClassForRequest(String className)

Checks to see if we are looking at an alias or a fully-qualified class name. Any known alias or valid FQCN is allowed