Package org.gvsig.remoteclient.wfs.request

Class WFSTLockFeatureRequest

java.lang.Object

org.gvsig.remoteclient.ogc.request.OGCRequest

org.gvsig.remoteclient.wfs.request.WFSRequest

org.gvsig.remoteclient.wfs.request.WFSTLockFeatureRequest

Direct Known Subclasses:

WFSTLockFeatureRequest1_0_0

public abstract class WFSTLockFeatureRequest
extends WFSRequest

Web connections are inherently stateless. As a consequence of this, the semantics of serializable transactions are not preserved. To understand the issue, consider an update operation. The client fetches a feature instance. The feature is then modified on the client side, and submitted back to the database via a Transaction request for update. Serializability is lost since there is nothing to guarantee that while the feature was being modified on the client side, another client did not come along and update that same feature in the database. One way to ensure serializability is to require that access to data be done in a mutually exclusive manner; that is while one transaction accesses a data item, no other transaction can modify the same data item. This can be accomplished by using locks that control access to the data. The purpose of the LockFeature operation is to expose a long term feature locking mechanism to ensure consistency. The lock is considered long term because network latency would make feature locks last relatively longer than native commercial database locks. The LockFeature operation is optional and does not need to be implemented for a WFS implementation to conform to this specification. If a WFS implements the LockFeature operation, this fact must be advertised in the capabilities document

Author:

Jorge Piera LLodrá (jorge.piera@iver.es)

Field Summary

Fields inherited from class org.gvsig.remoteclient.wfs.request.WFSRequest

status

Fields inherited from class org.gvsig.remoteclient.ogc.request.OGCRequest

isDeleted, protocolHandler, XMLTAG_ENDCHARACTER, XMLTAG_FINISHCHARACTER, XMLTAG_STARTCHARACTER

Constructor Summary

Constructors

Constructor	Description
WFSTLockFeatureRequest(WFSStatus status, WFSProtocolHandler protocolHandler)

Method Summary

Modifier and Type	Method	Description
protected String	getOperationName()
protected String	getSchemaLocation()
protected String	getTempFilePrefix()

Methods inherited from class org.gvsig.remoteclient.wfs.request.WFSRequest

createRequestInformation, sendRequest

Methods inherited from class org.gvsig.remoteclient.ogc.request.OGCRequest

createXMLEndtTag, createXMLStartTag, getHttpGetRequest, getHttpPostRequest, getSymbol, getURL, isDeleted, setDeleted

Methods inherited from class java.lang.Object

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

Constructor Details

WFSTLockFeatureRequest

public WFSTLockFeatureRequest(WFSStatus status,
 WFSProtocolHandler protocolHandler)

Method Details

getTempFilePrefix

protected String getTempFilePrefix()

Specified by:

getTempFilePrefix in class org.gvsig.remoteclient.ogc.request.OGCRequest

getOperationName

protected String getOperationName()

Specified by:

getOperationName in class org.gvsig.remoteclient.ogc.request.OGCRequest

getSchemaLocation

protected String getSchemaLocation()

Specified by:

getSchemaLocation in class org.gvsig.remoteclient.ogc.request.OGCRequest