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Diffstat (limited to 'db-4.8.30/examples_java/src/collections/ship/sentity/Sample.java')
| -rw-r--r-- | db-4.8.30/examples_java/src/collections/ship/sentity/Sample.java | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/db-4.8.30/examples_java/src/collections/ship/sentity/Sample.java b/db-4.8.30/examples_java/src/collections/ship/sentity/Sample.java new file mode 100644 index 0000000..c7d1b44 --- /dev/null +++ b/db-4.8.30/examples_java/src/collections/ship/sentity/Sample.java @@ -0,0 +1,249 @@ +/*- + * See the file LICENSE for redistribution information. + * + * Copyright (c) 2002-2009 Oracle. All rights reserved. + * + * $Id$ + */ + +package collections.ship.sentity; + +import java.io.FileNotFoundException; +import java.util.Iterator; +import java.util.Set; + +import com.sleepycat.collections.StoredIterator; +import com.sleepycat.collections.TransactionRunner; +import com.sleepycat.collections.TransactionWorker; +import com.sleepycat.db.DatabaseException; + +/** + * Sample is the main entry point for the sample program and may be run as + * follows: + * + * <pre> + * java collections.ship.sentity.Sample + * [-h <home-directory> ] + * </pre> + * + * <p> The default for the home directory is ./tmp -- the tmp subdirectory of + * the current directory where the sample is run. To specify a different home + * directory, use the -home option. The home directory must exist before + * running the sample. To recreate the sample database from scratch, delete + * all files in the home directory before running the sample. </p> + * + * @author Mark Hayes + */ +public class Sample { + + private SampleDatabase db; + private SampleViews views; + + /** + * Run the sample program. + */ + public static void main(String[] args) { + + System.out.println("\nRunning sample: " + Sample.class); + + // Parse the command line arguments. + // + String homeDir = "./tmp"; + for (int i = 0; i < args.length; i += 1) { + if (args[i].equals("-h") && i < args.length - 1) { + i += 1; + homeDir = args[i]; + } else { + System.err.println("Usage:\n java " + Sample.class.getName() + + "\n [-h <home-directory>]"); + System.exit(2); + } + } + + // Run the sample. + // + Sample sample = null; + try { + sample = new Sample(homeDir); + sample.run(); + } catch (Exception e) { + // If an exception reaches this point, the last transaction did not + // complete. If the exception is RunRecoveryException, follow + // the Berkeley DB recovery procedures before running again. + e.printStackTrace(); + } finally { + if (sample != null) { + try { + // Always attempt to close the database cleanly. + sample.close(); + } catch (Exception e) { + System.err.println("Exception during database close:"); + e.printStackTrace(); + } + } + } + } + + /** + * Open the database and views. + */ + private Sample(String homeDir) + throws DatabaseException, FileNotFoundException { + + db = new SampleDatabase(homeDir); + views = new SampleViews(db); + } + + /** + * Close the database cleanly. + */ + private void close() + throws DatabaseException { + + db.close(); + } + + /** + * Run two transactions to populate and print the database. A + * TransactionRunner is used to ensure consistent handling of transactions, + * including deadlock retries. But the best transaction handling mechanism + * to use depends on the application. + */ + private void run() + throws Exception { + + TransactionRunner runner = new TransactionRunner(db.getEnvironment()); + runner.run(new PopulateDatabase()); + runner.run(new PrintDatabase()); + } + + /** + * Populate the database in a single transaction. + */ + private class PopulateDatabase implements TransactionWorker { + + public void doWork() + throws Exception { + addSuppliers(); + addParts(); + addShipments(); + } + } + + /** + * Print the database in a single transaction. All entities are printed + * and the indices are used to print the entities for certain keys. + * + * <p> Note the use of special iterator() methods. These are used here + * with indices to find the shipments for certain keys. For details on + * database iterators see {@link StoredIterator}. </p> + */ + private class PrintDatabase implements TransactionWorker { + + public void doWork() + throws Exception { + printValues("Parts", + views.getPartSet().iterator()); + printValues("Suppliers", + views.getSupplierSet().iterator()); + printValues("Suppliers for City Paris", + views.getSupplierByCityMap().duplicates( + "Paris").iterator()); + printValues("Shipments", + views.getShipmentSet().iterator()); + printValues("Shipments for Part P1", + views.getShipmentByPartMap().duplicates( + new PartKey("P1")).iterator()); + printValues("Shipments for Supplier S1", + views.getShipmentBySupplierMap().duplicates( + new SupplierKey("S1")).iterator()); + } + } + + /** + * Populate the part entities in the database. If the part set is not + * empty, assume that this has already been done. + */ + private void addParts() { + + Set parts = views.getPartSet(); + if (parts.isEmpty()) { + System.out.println("Adding Parts"); + parts.add(new Part("P1", "Nut", "Red", + new Weight(12.0, Weight.GRAMS), "London")); + parts.add(new Part("P2", "Bolt", "Green", + new Weight(17.0, Weight.GRAMS), "Paris")); + parts.add(new Part("P3", "Screw", "Blue", + new Weight(17.0, Weight.GRAMS), "Rome")); + parts.add(new Part("P4", "Screw", "Red", + new Weight(14.0, Weight.GRAMS), "London")); + parts.add(new Part("P5", "Cam", "Blue", + new Weight(12.0, Weight.GRAMS), "Paris")); + parts.add(new Part("P6", "Cog", "Red", + new Weight(19.0, Weight.GRAMS), "London")); + } + } + + /** + * Populate the supplier entities in the database. If the supplier set is + * not empty, assume that this has already been done. + */ + private void addSuppliers() { + + Set suppliers = views.getSupplierSet(); + if (suppliers.isEmpty()) { + System.out.println("Adding Suppliers"); + suppliers.add(new Supplier("S1", "Smith", 20, "London")); + suppliers.add(new Supplier("S2", "Jones", 10, "Paris")); + suppliers.add(new Supplier("S3", "Blake", 30, "Paris")); + suppliers.add(new Supplier("S4", "Clark", 20, "London")); + suppliers.add(new Supplier("S5", "Adams", 30, "Athens")); + } + } + + /** + * Populate the shipment entities in the database. If the shipment set + * is not empty, assume that this has already been done. + */ + private void addShipments() { + + Set shipments = views.getShipmentSet(); + if (shipments.isEmpty()) { + System.out.println("Adding Shipments"); + shipments.add(new Shipment("P1", "S1", 300)); + shipments.add(new Shipment("P2", "S1", 200)); + shipments.add(new Shipment("P3", "S1", 400)); + shipments.add(new Shipment("P4", "S1", 200)); + shipments.add(new Shipment("P5", "S1", 100)); + shipments.add(new Shipment("P6", "S1", 100)); + shipments.add(new Shipment("P1", "S2", 300)); + shipments.add(new Shipment("P2", "S2", 400)); + shipments.add(new Shipment("P2", "S3", 200)); + shipments.add(new Shipment("P2", "S4", 200)); + shipments.add(new Shipment("P4", "S4", 300)); + shipments.add(new Shipment("P5", "S4", 400)); + } + } + + /** + * Print the objects returned by an iterator of entity value objects. + * + * <p><b> IMPORTANT: All database iterators must be closed to avoid + * serious database problems. If the iterator is not closed, the + * underlying Berkeley DB cursor is not closed either. </b></p> + */ + private void printValues(String label, Iterator iterator) { + + System.out.println("\n--- " + label + " ---"); + try { + while (iterator.hasNext()) { + System.out.println(iterator.next().toString()); + } + } finally { + // IMPORTANT: Use StoredIterator to close all database + // iterators. If java.util.Iterator is in hand, you can safely + // close it by calling StoredIterator.close(Iterator). + StoredIterator.close(iterator); + } + } +} |