com.metamatrix.connector.xml.streaming
Class BaseStreamingExecution

java.lang.Object
  com.metamatrix.connector.xml.streaming.BaseStreamingExecution

All Implemented Interfaces:

XMLExecution, Execution, ResultSetExecution

Direct Known Subclasses:

FileExecution, HTTPExecution

public abstract class BaseStreamingExecution
extends java.lang.Object
implements XMLExecution

Field Summary

protected XMLConnectionImpl	connection
protected ConnectorEnvironment	connEnv
protected ExecutionContext	exeContext
protected ExecutionInfo	exeInfo
protected ConnectorLogger	logger
protected RuntimeMetadata	metadata
protected IQuery	query
protected java.util.List<ResultProducer>	resultProducers
protected java.util.List<java.lang.Object[]>	results
protected StreamingResultsProducer	rowProducer
protected java.util.List<java.lang.String>	xpaths

Constructor Summary

BaseStreamingExecution(IQuery command, XMLConnectionImpl conn, RuntimeMetadata rtMetadata, ExecutionContext context, ConnectorEnvironment env)

Method Summary

void	cancel() Cancels the execution abnormally.
void	close() Terminates the execution normally.
XMLConnection	getConnection()
ExecutionContext	getExeContext()
java.util.List	next() Earlier implementations retrieved the XML in the execute method.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.metamatrix.connector.xml.XMLExecution

getStreamProducer

Methods inherited from interface org.teiid.connector.api.Execution

execute

Field Detail

xpaths

protected java.util.List<java.lang.String> xpaths

rowProducer

protected StreamingResultsProducer rowProducer

results

protected java.util.List<java.lang.Object[]> results

resultProducers

protected java.util.List<ResultProducer> resultProducers

exeInfo

protected ExecutionInfo exeInfo

query

protected IQuery query

metadata

protected RuntimeMetadata metadata

exeContext

protected ExecutionContext exeContext

connEnv

protected ConnectorEnvironment connEnv

connection

protected XMLConnectionImpl connection

logger

protected ConnectorLogger logger

Constructor Detail

BaseStreamingExecution

public BaseStreamingExecution(IQuery command,
                              XMLConnectionImpl conn,
                              RuntimeMetadata rtMetadata,
                              ExecutionContext context,
                              ConnectorEnvironment env)

Method Detail

cancel

public void cancel()
            throws ConnectorException

Description copied from interface: Execution

Cancels the execution abnormally. This will happen via a different thread from the one performing the execution, so should be expected to happen in a multi-threaded scenario.

Specified by:

cancel in interface Execution

Throws:

ConnectorException

close

public void close()
           throws ConnectorException

Description copied from interface: Execution

Terminates the execution normally.

Specified by:

close in interface Execution

Throws:

ConnectorException

next

public java.util.List next()
                    throws ConnectorException,
                           DataNotAvailableException

Earlier implementations retrieved the XML in the execute method. Because this can be any number of documents of any size, this caused memory problems because the xml was completely realized in memory. In this impl the setup work is done in execute and the xml is streamed in the next function.

Specified by:

next in interface ResultSetExecution

Throws:

ConnectorException

DataNotAvailableException

getExeContext

public ExecutionContext getExeContext()

Specified by:

getExeContext in interface XMLExecution

getConnection

public XMLConnection getConnection()

Specified by:

getConnection in interface XMLExecution