Examples of org.geotools.data.Transaction

org.geotools.data.Transaction
ide authoriztion road.removeFeatures( filter ); // operate against transaction river.removeFeature( filter ); // operate against transaction t.commit(); // commit operations } catch (IOException io){ t.rollback(); // cancel operations } finally { t.close(); // free resources }
Example code walkthrough (from the perspective of Transaction):
1. A new transaction is created (an instanceof DefaultTransaction with a handle)
2. A hint is provided using Transaction.putProperty( key, value )
3. Transaction is provided to two FeatureStores, this may result in Transaction.State instances being registered
4. t.addAuthorization(lockID) is called, each Transaction.State has its addAuthroization(String) callback invoked with the value of lockID
5. FeatureStore.removeFeatures methods are called on the two DataStores.
  - PostgisFeatureStore.removeFeatures(fitler) handles operation without delegation.
  - Most removeFeature(filter) implementations use the implementation provided by AbstractFeatureStore which delegates to FeatureWriter.
  Any of these operations may make use of the Transaction.putProperty( key, value ).
6. The transaction is commited, all of the Transaction.State methods have there Transaction.State.commit() methods called gicing them a chance to applyDiff maps, or commit various connections.
7. The transaction is closed, all of the Transaction.State methods have there Transaction.State.setTransaction( null ) called, giving them a chance to clean up diffMaps, or return connections to the pool.
@author Jody Garnett @author Chris Holmes, TOPP @source $URL$ @version $Id$

  }


  @Override
  protected void doCommit(DefaultTransactionStatus status) {
    GeoToolsTransactionObject txObject = (GeoToolsTransactionObject) status.getTransaction();
    Transaction tx = txObject.getTransactionHolder().getTransaction();
    try {
      tx.commit();
    } catch (IOException e) {
         log.warn(e.getMessage(), e);
    }
  }

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  }


  @Override
  protected void doRollback(DefaultTransactionStatus status) {
    GeoToolsTransactionObject txObject = (GeoToolsTransactionObject) status.getTransaction();
    Transaction tx = txObject.getTransactionHolder().getTransaction();
    try {
      tx.rollback();
    } catch (IOException e) {
      log.warn(e.getMessage(), e);
    }
  }

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              }
            }
            else
              throw new Exception("Unknown export type.");


            Transaction transaction = new DefaultTransaction("create");


            String typeName = dataStore.getTypeNames()[0];
            SimpleFeatureSource featureSource = dataStore.getFeatureSource(typeName);


            if (featureSource instanceof SimpleFeatureStore) 
            {
                SimpleFeatureStore featureStore = (SimpleFeatureStore) featureSource;


                featureStore.setTransaction(transaction);
               
                featureStore.addFeatures(collection);
                transaction.commit();


                transaction.close();
            } 
            else 
            {
              throw new Exception(typeName + " does not support read/write access");
            }

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            ProjectPlugin.log(message, illegalStateException);
            throw illegalStateException;
        }
        // grab the current map transaction
        EditManager editManager = (EditManager) layer.getMap().getEditManager();
        Transaction transaction = editManager.getTransaction();
        
        if (wrapped.getTransaction() == Transaction.AUTO_COMMIT) {
            // change over from autocommit to transactional
            wrapped.setTransaction(transaction);
        }

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     * A: (Jody) They can use the id; and grab the actual IResource from
     * the catalog; and get there own that way.
     */
    public void startTransaction() {
        if (wrapped.getTransaction() == Transaction.AUTO_COMMIT) {
            Transaction transaction = ((EditManager) layer.getMap().getEditManager())
                    .getTransaction();
            wrapped.setTransaction(transaction);
        }
    }

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            ProjectPlugin.log(message, illegalStateException);
            throw illegalStateException;
        }
        // grab the current map transaction
        EditManager editManager = (EditManager) layer.getMap().getEditManager();
        Transaction transaction = editManager.getTransaction();
        
        if (wrapped.getTransaction() == Transaction.AUTO_COMMIT) {
            // change over from autocommit to transactional
            wrapped.setTransaction(transaction);
        }

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     * A: (Jody) They can use the id; and grab the actual IResource from
     * the catalog; and get there own that way.
     */
    public void startTransaction() {
        if (wrapped.getTransaction() == Transaction.AUTO_COMMIT) {
            Transaction transaction = ((EditManager) layer.getMap().getEditManager())
                    .getTransaction();
            wrapped.setTransaction(transaction);
        }
    }

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    public void writeToShapefile( ShapefileDataStore dataStore, FeatureCollection<SimpleFeatureType, SimpleFeature> collection )
            throws IOException {
        String featureName = dataStore.getTypeNames()[0];
        FeatureSource<SimpleFeatureType, SimpleFeature> featureSource = dataStore.getFeatureSource(featureName);


        Transaction transaction = new DefaultTransaction("create");
        try {
            FeatureStore<SimpleFeatureType, SimpleFeature> featureStore = (FeatureStore<SimpleFeatureType, SimpleFeature>) featureSource;
            featureStore.setTransaction(transaction);
            featureStore.addFeatures(collection);
            transaction.commit();
        } catch (Exception eek) {
            transaction.rollback();
            throw new IOException("The transaction could now be finished, an error orrcurred", eek);
        } finally {
            transaction.close();
        }
    }

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     */
    @Test
    public void testGetGeoResourcesInterceptors() throws IOException {
        NullProgressMonitor nullProgressMonitor = new NullProgressMonitor();
        FeatureStore<SimpleFeatureType, SimpleFeature> resource = layer.getResource(FeatureStore.class, nullProgressMonitor);
        Transaction transaction = resource.getTransaction();
        assertNotNull(transaction);
        assertTrue(transaction==Transaction.AUTO_COMMIT);
        assertSame(transaction, resource.getTransaction());
        assertSame(resource, layer.getResource(FeatureStore.class, nullProgressMonitor));
        assertSame(resource, layer.getResource(FeatureSource.class, nullProgressMonitor));

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    public void testLockUnlockFilter() throws Exception {
        FeatureLocking<SimpleFeatureType, SimpleFeature> fl;
        fl = (FeatureLocking<SimpleFeatureType, SimpleFeature>) rts.getFeatureSource(RENAMED);
        final FeatureLock lock = FeatureLockFactory.generate(10 * 60 * 1000);
        Transaction t = new DefaultTransaction();
        t.addAuthorization(lock.getAuthorization());
        fl.setTransaction(t);
        fl.setFeatureLock(lock);


        FeatureLocking<SimpleFeatureType, SimpleFeature> fl2;
        fl2 = (FeatureLocking<SimpleFeatureType, SimpleFeature>) rts.getFeatureSource(RENAMED);

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