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authorZhang Qiang <qiang.z.zhang@intel.com>2012-05-29 12:22:00 +0800
committerZhang Qiang <qiang.z.zhang@intel.com>2012-05-29 12:22:00 +0800
commit02f0634ac29e19c68279e5544cac963e7f1203b8 (patch)
treeb983472f94ef063cedf866d8ecfb55939171779d /examples_java/src/collections/ship/marshal/Sample.java
parente776056ea09ba0b6d9505ced6913c9190a12d632 (diff)
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+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 2002-2009 Oracle. All rights reserved.
+ *
+ * $Id$
+ */
+
+package collections.ship.marshal;
+
+import java.io.FileNotFoundException;
+import java.util.Iterator;
+import java.util.Set;
+
+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.marshal.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.</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.
+ */
+ private void printValues(String label, Iterator iterator) {
+
+ System.out.println("\n--- " + label + " ---");
+ while (iterator.hasNext()) {
+ System.out.println(iterator.next().toString());
+ }
+ }
+}