simpledb.parallel

Class CollectProducer

java.lang.Object

simpledb.Operator

simpledb.parallel.Exchange

simpledb.parallel.Producer

simpledb.parallel.CollectProducer

All Implemented Interfaces:

java.io.Serializable, DbIterator

public class CollectProducer
extends Producer

The producer part of the Collect Exchange operator. The producer actively pushes the tuples generated by the child operator to the paired CollectConsumer.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) class	CollectProducer.WorkingThread The working thread, which executes the child operator and send the tuples to the paired CollectConsumer operator

Nested classes/interfaces inherited from class simpledb.parallel.Exchange

Exchange.ParallelOperatorID

Field Summary

Fields

Modifier and Type	Field and Description
private DbIterator	child
private java.net.InetSocketAddress	collectConsumerAddr The paired collect consumer address
private CollectProducer.WorkingThread	runningThread
private static long	serialVersionUID

Fields inherited from class simpledb.parallel.Exchange

operatorID

Constructor Summary

Constructors

Constructor and Description
CollectProducer(DbIterator child, Exchange.ParallelOperatorID operatorID, java.net.InetSocketAddress collectServerAddr)
CollectProducer(DbIterator child, Exchange.ParallelOperatorID operatorID, java.lang.String collectServerHost, int collectServerPort)

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Closes this iterator.
protected Tuple	fetchNext() Returns the next Tuple in the iterator, or null if the iteration is finished.
DbIterator[]	getChildren()
java.net.InetSocketAddress	getCollectServerAddr()
java.lang.String	getName() Return the name of the exchange, used only to display the operator in the operator tree
TupleDesc	getTupleDesc() Returns the TupleDesc associated with this DbIterator.
void	open() Opens the iterator.
void	rewind() Resets the iterator to the start.
void	setChildren(DbIterator[] children) Set the children(child) of this operator.

Methods inherited from class simpledb.parallel.Producer

getThisWorker, setThisWorker

Methods inherited from class simpledb.parallel.Exchange

getOperatorID

Methods inherited from class simpledb.Operator

getEstimatedCardinality, hasNext, next, setEstimatedCardinality

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

runningThread

private transient CollectProducer.WorkingThread runningThread

collectConsumerAddr

private final java.net.InetSocketAddress collectConsumerAddr

The paired collect consumer address

child

private DbIterator child

Constructor Detail

CollectProducer

public CollectProducer(DbIterator child,
               Exchange.ParallelOperatorID operatorID,
               java.lang.String collectServerHost,
               int collectServerPort)

CollectProducer

public CollectProducer(DbIterator child,
               Exchange.ParallelOperatorID operatorID,
               java.net.InetSocketAddress collectServerAddr)

Method Detail

getName

public java.lang.String getName()

Description copied from class: Exchange

Return the name of the exchange, used only to display the operator in the operator tree

Specified by:

getName in class Exchange

getCollectServerAddr

public java.net.InetSocketAddress getCollectServerAddr()

open

public void open()
          throws DbException,
                 TransactionAbortedException

Description copied from interface: DbIterator

Opens the iterator. This must be called before any of the other methods.

Specified by:

open in interface DbIterator

Overrides:

open in class Operator

Throws:

DbException - when there are problems opening/accessing the database.

TransactionAbortedException

close

public void close()

Description copied from class: Operator

Closes this iterator. If overridden by a subclass, they should call super.close() in order for Operator's internal state to be consistent.

Specified by:

close in interface DbIterator

Overrides:

close in class Operator

rewind

public void rewind()
            throws DbException,
                   TransactionAbortedException

Description copied from interface: DbIterator

Resets the iterator to the start.

Throws:

DbException - when rewind is unsupported.

TransactionAbortedException

getTupleDesc

public TupleDesc getTupleDesc()

Description copied from interface: DbIterator

Returns the TupleDesc associated with this DbIterator.

Specified by:

getTupleDesc in interface DbIterator

Specified by:

getTupleDesc in class Operator

Returns:

return the TupleDesc of the output tuples of this operator

fetchNext

protected Tuple fetchNext()
                   throws DbException,
                          TransactionAbortedException

Description copied from class: Operator

Returns the next Tuple in the iterator, or null if the iteration is finished. Operator uses this method to implement both next and hasNext.

Specified by:

fetchNext in class Operator

Returns:

the next Tuple in the iterator, or null if the iteration is finished.

Throws:

DbException

TransactionAbortedException

getChildren

public DbIterator[] getChildren()

Specified by:

getChildren in class Operator

Returns:

return the children DbIterators of this operator. If there is only one child, return an array of only one element. For join operators, the order of the children is not important. But they should be consistent among multiple calls.

setChildren

public void setChildren(DbIterator[] children)

Description copied from class: Operator

Set the children(child) of this operator. If the operator has only one child, children[0] should be used. If the operator is a join, children[0] and children[1] should be used.

Specified by:

setChildren in class Operator

Parameters:

children - the DbIterators which are to be set as the children(child) of this operator