Package de.zib.scalaris.executor

Class ScalarisChangeListOp2

java.lang.Object

de.zib.scalaris.executor.ScalarisChangeListOp2

All Implemented Interfaces:

ScalarisOp

Direct Known Subclasses:

ScalarisListAppendRemoveOp2

public abstract class ScalarisChangeListOp2
extends java.lang.Object
implements ScalarisOp

Implements a list change operation using the append operation of Scalaris. Supports an (optional) list counter key which is updated accordingly. Sub-classes need to override changeList(RequestList) to perform the changes and issue a single AddOnNrOp operation and (optionally) a second AddOnNrOp for a list counter key!

Since:

3.18

Version:

3.18

Author:

Nico Kruber, kruber@zib.de

Constructor Summary

Constructors

Constructor	Description
ScalarisChangeListOp2(java.lang.String key, java.lang.String countKey)	Creates a new list change operation.

Method Summary

Modifier and Type	Method	Description
int	doPhase(int phase, int firstOp, ResultList results, RequestList requests)	Executes the given phase.
int	workPhases()	Gets the number of work phases needed by this operation (not including the final result verification phase).

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.zib.scalaris.executor.ScalarisOp

toString

Constructor Detail

ScalarisChangeListOp2

public ScalarisChangeListOp2(java.lang.String key,
                             java.lang.String countKey)

Creates a new list change operation.

Parameters:

key - the key to change the list at

countKey - the key for the counter of the entries in the list (may be null)

Method Detail

workPhases

public int workPhases()

Description copied from interface: ScalarisOp

Gets the number of work phases needed by this operation (not including the final result verification phase).

Specified by:

workPhases in interface ScalarisOp

Returns:

number of required phases

doPhase

public final int doPhase(int phase,
                         int firstOp,
                         ResultList results,
                         RequestList requests)
                  throws com.ericsson.otp.erlang.OtpErlangException,
                         UnknownException,
                         java.lang.IllegalArgumentException

Description copied from interface: ScalarisOp

Executes the given phase.

Specified by:

doPhase in interface ScalarisOp

Parameters:

phase - the number of the current phase

firstOp - the current operation's index in the result list

results - the results from the previous operations (may be null if there was none)

requests - the requests for the next operations (may be null if there are none, i.e. in the verification phase)

Returns:

the number of processed operations from the results list

Throws:

com.ericsson.otp.erlang.OtpErlangException - if an error occured verifying a result from previous operations

UnknownException - if an error occured verifying a result from previous operations

java.lang.IllegalArgumentException - if the given work phase is not supported

See Also:

ScalarisOp.workPhases()