org.geotools.data

Interface FeatureLocking<T extends FeatureType,F extends Feature>

All Superinterfaces:

FeatureSource<T,F>, FeatureStore<T,F>

All Known Subinterfaces:

SimpleFeatureLocking

All Known Implementing Classes:

ContentFeatureStore, CSVFeatureStore, DirectoryFeatureLocking, GeoJSONFeatureStore, JDBCFeatureStore, MemoryFeatureStore, MongoFeatureStore, PropertyFeatureStore

public interface FeatureLocking<T extends FeatureType,F extends Feature>
extends FeatureStore<T,F>

Provides Feature based locking.

Features from individual shapefiles, database tables, etc. can be protected or reserved from modification through this interface.

To use please cast your SimpleFeatureSource to this interface.

 SimpleFeatureSource source = dataStore.getFeatureSource("roads");
 if( source instanceof FeatureLocking ) {
     FeatureLocking locking = (FeatureLocking) source;
     ...
 }

Author:

Jody Garnett, Refractions Research, Inc., Ray Gallagher, Rob Hranac, TOPP, Chris Holmes, TOPP

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	FeatureLocking.Response Idea for a response from a high-level lock( Query ) function.

Method Summary

Modifier and Type	Method and Description
int	lockFeatures() FeatureLock all Features.
int	lockFeatures(Filter filter) FeatureLock features described by Filter.
int	lockFeatures(Query query) FeatureLock features described by Query.
void	setFeatureLock(FeatureLock lock) All locking operations will operate against the provided lock.
void	unLockFeatures() Unlocks all Features.
void	unLockFeatures(Filter filter) Unlock Features denoted by provided filter.
void	unLockFeatures(Query query) Unlock Features denoted by provided query.

Methods inherited from interface FeatureStore

addFeatures, getTransaction, modifyFeatures, modifyFeatures, removeFeatures, setFeatures, setTransaction

Methods inherited from interface FeatureSource

addFeatureListener, getBounds, getBounds, getCount, getDataStore, getFeatures, getFeatures, getFeatures, getInfo, getName, getQueryCapabilities, getSchema, getSupportedHints, removeFeatureListener

Method Detail

setFeatureLock

void setFeatureLock(FeatureLock lock)

All locking operations will operate against the provided lock.

This in in keeping with the stateful spirit of DataSource in which operations are against the "current" transaction. If a FeatureLock is not provided lock operations will only be applicable for the current transaction (they will expire on the next commit or rollback).

That is lockFeatures() operations will:

• Be recorded against the provided FeatureLock.
• Be recorded against the current transaction if no FeatureLock is provided.

Calling this method with setFeatureLock( FeatureLock.TRANSACTION ) will revert to per transaction operation.

This design allows for the following:

• cross DataSource FeatureLock usage
• not having pass in the same FeatureLock object multiple times

Parameters:

lock - FeatureLock configuration including authorization and requested duration

lockFeatures

int lockFeatures(Query query)
          throws IOException

FeatureLock features described by Query.

To implement WFS parcial Locking retrieve your features with a query operation first before trying to lock them individually. If you are not into WFS please don't ask what parcial locking is.

Parameters:

query - Query describing the features to lock

Returns:

Number of features locked

Throws:

IOException - Thrown if anything goes wrong

lockFeatures

int lockFeatures(Filter filter)
          throws IOException

FeatureLock features described by Filter.

To implement WFS parcial Locking retrieve your features with a query operation first before trying to lock them individually. If you are not into WFS please don't ask what parcial locking is.

Parameters:

filter - Filter describing the features to lock

Returns:

Number of features locked

Throws:

IOException - Thrown if anything goes wrong

lockFeatures

int lockFeatures()
          throws IOException

FeatureLock all Features.

The method does not prevent addFeatures() from being used (we could add a lockDataSource() method if this functionality is required.

Returns:

Number of Features locked by this opperation

Throws:

IOException

unLockFeatures

void unLockFeatures()
             throws IOException

Unlocks all Features.

Authorization must be provided prior before calling this method.

 void releaseLock( String lockId, LockingDataSource ds ){
    ds.setAuthorization( "LOCK534" );
    ds.unLockFeatures();
 }
 

Throws:

IOException

unLockFeatures

void unLockFeatures(Filter filter)
             throws IOException

Unlock Features denoted by provided filter.

Authorization must be provided prior before calling this method.

Throws:

IOException

unLockFeatures

void unLockFeatures(Query query)
             throws IOException

Unlock Features denoted by provided query.

Authorization must be provided prior before calling this method.

Parameters:

query - Specifies fatures to unlock

Throws:

IOException