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 $Id$

        .createNewDataStore(params);
    SimpleFeatureTypeBuilder tb = new SimpleFeatureTypeBuilder();
    tb.setName("shapefile");
    tb.add("the_geom", Point.class);
    ds.createSchema(tb.buildFeatureType());
    Transaction transaction = Transaction.AUTO_COMMIT;
    FeatureWriter<SimpleFeatureType, SimpleFeature> writer = ds.getFeatureWriter(ds.getTypeNames()[0], Transaction.AUTO_COMMIT);
    SimpleFeature feature = writer.next();
    feature.setAttribute(0, null);
    writer.close();
    transaction.commit();
    ds.dispose();


    // Read the same file and check the geometry is null
    ShpFiles shpFiles = new ShpFiles(shpUrl);
    ShapefileReader reader = new ShapefileReader(shpFiles, false, true,

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        ShapefileDataStore sds = createDataStore();


        int idx = loadFeatures(sds).size();


        while (idx > 0) {
            Transaction t = new DefaultTransaction();
            FeatureWriter<SimpleFeatureType, SimpleFeature> writer = null;


            try {
                writer = sds.getFeatureWriter(sds.getTypeNames()[0],
                        Filter.INCLUDE, t);
                writer.next();
                writer.remove();
            } finally {
                if (writer != null) {
                    writer.close();
                    writer = null;
                }
            }
            t.commit();
            t.close();
            assertEquals(--idx, loadFeatures(sds).size());
        }
        sds.dispose();
    }

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        int idx = sds.getFeatureSource().getCount(Query.ALL);


        SimpleFeatureStore store = (SimpleFeatureStore) sds.getFeatureSource(sds
                .getTypeNames()[0]);


        Transaction transaction = new DefaultTransaction();
        store.setTransaction(transaction);
        SimpleFeature[] newFeatures1 = new SimpleFeature[1];
        SimpleFeature[] newFeatures2 = new SimpleFeature[2];
        GeometryFactory fac = new GeometryFactory();
        newFeatures1[0] = DataUtilities.template(sds.getSchema());
        newFeatures1[0].setDefaultGeometry(fac
                .createPoint(new Coordinate(0, 0)));
        newFeatures2[0] = DataUtilities.template(sds.getSchema());
        newFeatures2[0].setDefaultGeometry(fac
                .createPoint(new Coordinate(0, 0)));
        newFeatures2[1] = DataUtilities.template(sds.getSchema());
        newFeatures2[1].setDefaultGeometry(fac
                .createPoint(new Coordinate(0, 0)));


        store.addFeatures(DataUtilities.collection(newFeatures1));
        store.addFeatures(DataUtilities.collection(newFeatures2));
        transaction.commit();
        transaction.close();
        assertEquals(idx + 3, sds.getCount(Query.ALL));
        sds.dispose();


    }

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        tmpFile.createNewFile();
        ShapefileDataStore s = new ShapefileDataStore(tmpFile.toURI().toURL());
        s.createSchema(type);
        
        // was failing in GEOT-2427
        Transaction t= new DefaultTransaction();
        FeatureWriter<SimpleFeatureType, SimpleFeature> writer = s.getFeatureWriter(s.getTypeNames()[0], t);
        SimpleFeature feature1 = writer.next();
        writer.close();
        s.dispose();
    }

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        // http://jira.codehaus.org/browse/GEOT-2357
        
        final ShapefileDataStore ds = createDataStore();
        SimpleFeatureStore store;
        store = (SimpleFeatureStore) ds.getFeatureSource();
        Transaction t = new DefaultTransaction();
        store.setTransaction(t);
        
        int initialCount = store.getCount(Query.ALL);
        
        SimpleFeatureIterator features = store.getFeatures().features();

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            FeatureWriter<SimpleFeatureType, SimpleFeature> writer) {
        this.store = store;
        this.writer = writer;
        this.state = store.getState();
        
        Transaction t = state.getTransaction();
        if( t != Transaction.AUTO_COMMIT ){
            // auto commit does not issue batch events
            t.putState(this,new EventContentTransactionState());
        }
    }

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     * </p>
     * 
     * @see org.geotools.data.FeatureWriter#close()
     */
    public void close() throws IOException {
        Transaction t = state.getTransaction();
        if (t != Transaction.AUTO_COMMIT ){
            t.removeState(this);
        }
        if( writer != null ){
            writer.close();
            writer = null;
        }

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        // transactionExample start
        Map<String, Serializable> params = new HashMap<String, Serializable>();
        params.put("file", file);
        DataStore store = DataStoreFinder.getDataStore(params);


        Transaction t1 = new DefaultTransaction("transaction 1");
        Transaction t2 = new DefaultTransaction("transactoin 2");


        SimpleFeatureType type = store.getSchema("locations");
        SimpleFeatureStore featureStore = (SimpleFeatureStore) store.getFeatureSource("locations");
        SimpleFeatureStore featureStore1 = (SimpleFeatureStore) store.getFeatureSource("locations");
        SimpleFeatureStore featureStore2 = (SimpleFeatureStore) store.getFeatureSource("locations");


        featureStore1.setTransaction(t1);
        featureStore2.setTransaction(t2);


        System.out.println("Step 1");
        System.out.println("------");
        System.out.println("start     auto-commit: "
                + DataUtilities.fidSet(featureStore.getFeatures()));
        System.out.println("start              t1: "
                + DataUtilities.fidSet(featureStore1.getFeatures()));
        System.out.println("start              t2: "
                + DataUtilities.fidSet(featureStore2.getFeatures()));


        // select feature to remove
        FilterFactory ff = CommonFactoryFinder.getFilterFactory(null);
        Filter filter1 = ff.id(Collections.singleton(ff.featureId("fid1")));
        featureStore1.removeFeatures(filter1); // road1 removes fid1 on t1


        System.out.println();
        System.out.println("Step 2 transaction 1 removes feature 'fid1'");
        System.out.println("------");
        System.out.println("t1 remove auto-commit: "
                + DataUtilities.fidSet(featureStore.getFeatures()));
        System.out.println("t1 remove          t1: "
                + DataUtilities.fidSet(featureStore1.getFeatures()));
        System.out.println("t1 remove          t2: "
                + DataUtilities.fidSet(featureStore2.getFeatures()));


        // new feature to add!
        // 45.52, -122.681944, Portland, 800, 2014
        GeometryFactory gf = JTSFactoryFinder.getGeometryFactory();
        Point portland = gf.createPoint(new Coordinate( 45.52, -122.681944));
        SimpleFeature feature = SimpleFeatureBuilder.build(type, new Object[] { portland, "Portland", 800, 2014 }, "locations.1");
        SimpleFeatureCollection collection = DataUtilities.collection(feature);
        featureStore2.addFeatures(collection);


        System.out.println();
        System.out.println("Step 3 transaction 2 adds a new feature '" + feature.getID() + "'");
        System.out.println("------");
        System.out.println("t2 add    auto-commit: "
                + DataUtilities.fidSet(featureStore.getFeatures()));
        System.out.println("t2 add             t1: "
                + DataUtilities.fidSet(featureStore1.getFeatures()));
        System.out.println("t1 add             t2: "
                + DataUtilities.fidSet(featureStore2.getFeatures()));


        // commit transaction one
        t1.commit();


        System.out.println();
        System.out.println("Step 4 transaction 1 commits the removal of feature 'fid1'");
        System.out.println("------");
        System.out.println("t1 commit auto-commit: "
                + DataUtilities.fidSet(featureStore.getFeatures()));
        System.out.println("t1 commit          t1: "
                + DataUtilities.fidSet(featureStore1.getFeatures()));
        System.out.println("t1 commit          t2: "
                + DataUtilities.fidSet(featureStore2.getFeatures()));


        // commit transaction two
        t2.commit();


        System.out.println();
        System.out
                .println("Step 5 transaction 2 commits the addition of '" + feature.getID() + "'");
        System.out.println("------");
        System.out.println("t2 commit auto-commit: "
                + DataUtilities.fidSet(featureStore.getFeatures()));
        System.out.println("t2 commit          t1: "
                + DataUtilities.fidSet(featureStore1.getFeatures()));
        System.out.println("t2 commit          t2: "
                + DataUtilities.fidSet(featureStore2.getFeatures()));


        t1.close();
        t2.close();
        store.dispose(); // clear out any listeners
        // transactionExample end
        System.out.println("\ntransactionExample end\n");


        fileContents("transactionExample",file);

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        // removeAllExample start
        Map<String, Serializable> params = new HashMap<String, Serializable>();
        params.put("file", file);
        DataStore store = DataStoreFinder.getDataStore(params);


        Transaction t = new DefaultTransaction("locations");
        try {
            FeatureWriter<SimpleFeatureType, SimpleFeature> writer = store.getFeatureWriter(
                    "locations", Filter.INCLUDE, t);


            SimpleFeature feature;
            try {
                while (writer.hasNext()) {
                    feature = writer.next();
                    System.out.println("remove " + feature.getID());
                    writer.remove(); // marking contents for removal
                }
            } finally {
                writer.close();
            }
            System.out.println("commit " + t); // now the contents are removed
            t.commit();
        } catch (Throwable eek) {
            t.rollback();
        } finally {
            t.close();
            store.dispose();
        }
        // removeAllExample end
        System.out.println("\nremoveAllExample end\n");

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    public WFSDataStoreWriteOnlineTest(){
        Logger.global.setLevel(Level.SEVERE);
    }
    
    public static Id doInsert(DataStore ds,SimpleFeatureType ft,SimpleFeatureCollection insert) throws NoSuchElementException, IOException, IllegalAttributeException{
      Transaction t = new DefaultTransaction();
      WFSFeatureStore fs = (WFSFeatureStore)ds.getFeatureSource(ft.getTypeName());
      fs.setTransaction(t);
      System.out.println("Insert Read 1");
      SimpleFeatureIterator fr = fs.getFeatures().features();
      int count1 = 0;
      while(fr.hasNext()){
        count1 ++; fr.next();
      }
        fr.close();
      System.out.println("Insert Add Features");
      List<FeatureId> fids1 = fs.addFeatures(insert);


      System.out.println("Insert Read 2");
      fr = fs.getFeatures().features();
      int count2 = 0;
      while(fr.hasNext()){
        count2 ++; fr.next();
      }
        fr.close();
      assertEquals(count1+insert.size(), count2);


        FilterFactory fac=CommonFactoryFinder.getFilterFactory(null);
        Set<FeatureId> featureIds = new HashSet<FeatureId>();
        for(FeatureId id : fids1){
            featureIds.add(id);
        }
        Id fidfilter = fac.id(featureIds);
        
        System.out.println("Remove Inserted Features");
        fs.removeFeatures(fidfilter);
        
        System.out.println("Insert Read 3");
        fr = fs.getFeatures().features();
        count2 = 0;
        while(fr.hasNext()){
            count2 ++; fr.next();
        }
        fr.close();
        assertEquals(count1, count2);
        
        System.out.println("Insert Add Features");
        fs.addFeatures(insert);


        System.out.println("Insert Read 2");
        fr = fs.getFeatures().features();
        count2 = 0;
        while(fr.hasNext()){
            count2 ++; fr.next();
        }
        fr.close();
        assertEquals(count1+insert.size(), count2);


        
      System.out.println("Insert Commit");
      t.commit();


      System.out.println("Insert Read 3");
      fr = fs.getFeatures().features();
      int count3 = 0;
      while(fr.hasNext()){
        count3 ++; fr.next();
      }
        fr.close();
      assertEquals(count2,count3);
      
      WFSTransactionState ts = (WFSTransactionState)t.getState(ds);
      String[] fids = ts.getFids(ft.getTypeName());
      assertNotNull(fids);
      
        Set ids = new HashSet();
        for(int i=0;i<fids.length;i++){

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