/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2002-2003
* Sleepycat Software. All rights reserved.
*
* $Id: Sample.java,v 1.11 2003/10/18 19:50:39 mhayes Exp $
*/
package com.sleepycat.examples.bdb.shipment.tuple;
import com.sleepycat.bdb.TransactionRunner;
import com.sleepycat.bdb.TransactionWorker;
import com.sleepycat.bdb.collection.StoredIterator;
import com.sleepycat.db.DbException;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
/**
* Sample is the main entry point for the sample program and may be run as
* follows:
*
* <pre>
* java com.sleepycat.examples.bdb.shipment.tuple.Sample
* [-h <home-directory> ] [-multiprocess]
* </pre>
*
* <p> The default for the home directory is ./tmp -- the tmp subdirectory of
* the current directory where the sample is run. 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>
*
* <p> The default processing model is single-process, in which Berkeley DB
* recovery is always run when the environment is opened. If a multi-process
* model is desired, use the -multiprocess option and implement a monitor
* process which handles recovery. If -multiprocess is specified, Berkeley DB
* recovery will not be run automatically when opening the environment. </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.
//
boolean runRecovery = true;
String homeDir = "./tmp";
for (int i = 0; i < args.length; i += 1) {
String arg = args[i];
if (args[i].equals("-h") && i < args.length - 1) {
i += 1;
homeDir = args[i];
} else if (args[i].equals("-multiprocess")) {
runRecovery = false;
} else {
System.err.println("Usage:\n java " + Sample.class.getName() +
"\n [-h <home-directory>] [-multiprocess]");
System.exit(2);
}
}
// Run the sample.
//
Sample sample = null;
try {
sample = new Sample(homeDir, runRecovery);
sample.run();
} catch (Exception e) {
// If an exception reaches this point, the last transaction did not
// complete. If the exception is DbRunRecoveryException, 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, boolean runRecovery)
throws DbException, FileNotFoundException {
db = new SampleDatabase(homeDir, runRecovery);
views = new SampleViews(db);
}
/**
* Close the database cleanly.
*/
private void close()
throws DbException, IOException {
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);
}
}
}