mirror of
https://github.com/berkeleydb/je.git
synced 2024-11-15 01:46:24 +00:00
280 lines
9.9 KiB
Java
280 lines
9.9 KiB
Java
/*-
|
||
* Copyright (C) 2002, 2017, Oracle and/or its affiliates. All rights reserved.
|
||
*
|
||
* This file was distributed by Oracle as part of a version of Oracle Berkeley
|
||
* DB Java Edition made available at:
|
||
*
|
||
* http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html
|
||
*
|
||
* Please see the LICENSE file included in the top-level directory of the
|
||
* appropriate version of Oracle Berkeley DB Java Edition for a copy of the
|
||
* license and additional information.
|
||
*/
|
||
|
||
package collections.ship.index;
|
||
|
||
import java.util.Iterator;
|
||
import java.util.Map;
|
||
|
||
import com.sleepycat.collections.TransactionRunner;
|
||
import com.sleepycat.collections.TransactionWorker;
|
||
import com.sleepycat.je.DatabaseException;
|
||
|
||
/**
|
||
* Sample is the main entry point for the sample program and may be run as
|
||
* follows:
|
||
*
|
||
* <pre>
|
||
* java collections.ship.index.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. 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 final SampleDatabase db;
|
||
private final 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 {
|
||
|
||
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() {
|
||
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() {
|
||
printEntries("Parts",
|
||
views.getPartEntrySet().iterator());
|
||
printEntries("Suppliers",
|
||
views.getSupplierEntrySet().iterator());
|
||
printValues("Suppliers for City Paris",
|
||
views.getSupplierByCityMap().duplicates(
|
||
"Paris").iterator());
|
||
printEntries("Shipments",
|
||
views.getShipmentEntrySet().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 map is not
|
||
* empty, assume that this has already been done.
|
||
*/
|
||
private void addParts() {
|
||
|
||
Map parts = views.getPartMap();
|
||
if (parts.isEmpty()) {
|
||
System.out.println("Adding Parts");
|
||
parts.put(new PartKey("P1"),
|
||
new PartData("Nut", "Red",
|
||
new Weight(12.0, Weight.GRAMS),
|
||
"London"));
|
||
parts.put(new PartKey("P2"),
|
||
new PartData("Bolt", "Green",
|
||
new Weight(17.0, Weight.GRAMS),
|
||
"Paris"));
|
||
parts.put(new PartKey("P3"),
|
||
new PartData("Screw", "Blue",
|
||
new Weight(17.0, Weight.GRAMS),
|
||
"Rome"));
|
||
parts.put(new PartKey("P4"),
|
||
new PartData("Screw", "Red",
|
||
new Weight(14.0, Weight.GRAMS),
|
||
"London"));
|
||
parts.put(new PartKey("P5"),
|
||
new PartData("Cam", "Blue",
|
||
new Weight(12.0, Weight.GRAMS),
|
||
"Paris"));
|
||
parts.put(new PartKey("P6"),
|
||
new PartData("Cog", "Red",
|
||
new Weight(19.0, Weight.GRAMS),
|
||
"London"));
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Populate the supplier entities in the database. If the supplier map is
|
||
* not empty, assume that this has already been done.
|
||
*/
|
||
private void addSuppliers() {
|
||
|
||
Map suppliers = views.getSupplierMap();
|
||
if (suppliers.isEmpty()) {
|
||
System.out.println("Adding Suppliers");
|
||
suppliers.put(new SupplierKey("S1"),
|
||
new SupplierData("Smith", 20, "London"));
|
||
suppliers.put(new SupplierKey("S2"),
|
||
new SupplierData("Jones", 10, "Paris"));
|
||
suppliers.put(new SupplierKey("S3"),
|
||
new SupplierData("Blake", 30, "Paris"));
|
||
suppliers.put(new SupplierKey("S4"),
|
||
new SupplierData("Clark", 20, "London"));
|
||
suppliers.put(new SupplierKey("S5"),
|
||
new SupplierData("Adams", 30, "Athens"));
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Populate the shipment entities in the database. If the shipment map
|
||
* is not empty, assume that this has already been done.
|
||
*/
|
||
private void addShipments() {
|
||
|
||
Map shipments = views.getShipmentMap();
|
||
if (shipments.isEmpty()) {
|
||
System.out.println("Adding Shipments");
|
||
shipments.put(new ShipmentKey("P1", "S1"),
|
||
new ShipmentData(300));
|
||
shipments.put(new ShipmentKey("P2", "S1"),
|
||
new ShipmentData(200));
|
||
shipments.put(new ShipmentKey("P3", "S1"),
|
||
new ShipmentData(400));
|
||
shipments.put(new ShipmentKey("P4", "S1"),
|
||
new ShipmentData(200));
|
||
shipments.put(new ShipmentKey("P5", "S1"),
|
||
new ShipmentData(100));
|
||
shipments.put(new ShipmentKey("P6", "S1"),
|
||
new ShipmentData(100));
|
||
shipments.put(new ShipmentKey("P1", "S2"),
|
||
new ShipmentData(300));
|
||
shipments.put(new ShipmentKey("P2", "S2"),
|
||
new ShipmentData(400));
|
||
shipments.put(new ShipmentKey("P2", "S3"),
|
||
new ShipmentData(200));
|
||
shipments.put(new ShipmentKey("P2", "S4"),
|
||
new ShipmentData(200));
|
||
shipments.put(new ShipmentKey("P4", "S4"),
|
||
new ShipmentData(300));
|
||
shipments.put(new ShipmentKey("P5", "S4"),
|
||
new ShipmentData(400));
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Print the key/value objects returned by an iterator of Map.Entry
|
||
* objects.
|
||
*/
|
||
private void printEntries(String label, Iterator iterator) {
|
||
|
||
System.out.println("\n--- " + label + " ---");
|
||
while (iterator.hasNext()) {
|
||
Map.Entry entry = (Map.Entry) iterator.next();
|
||
System.out.println(entry.getKey().toString());
|
||
System.out.println(entry.getValue().toString());
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Print the objects returned by an iterator of value objects.
|
||
*/
|
||
private void printValues(String label, Iterator iterator) {
|
||
|
||
System.out.println("\n--- " + label + " ---");
|
||
while (iterator.hasNext()) {
|
||
System.out.println(iterator.next().toString());
|
||
}
|
||
}
|
||
}
|