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authorKim Kibum <kb0929.kim@samsung.com>2012-05-21 17:40:46 +0900
committerKim Kibum <kb0929.kim@samsung.com>2012-05-21 17:40:46 +0900
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tree01c1dd87d4cc0b62a655c0d768ff695d2d244728 /examples_java/src/db/EnvExample.java
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+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1997-2009 Oracle. All rights reserved.
+ *
+ * $Id$
+ */
+
+package db;
+
+import com.sleepycat.db.*;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.OutputStream;
+
+/*
+ * An example of a program configuring a database environment.
+ *
+ * For comparison purposes, this example uses a similar structure
+ * as examples/ex_env.c and examples_cxx/EnvExample.cpp.
+ */
+public class EnvExample {
+ private static final String progname = "EnvExample";
+
+ private static void runApplication(Environment dbenv)
+ throws DatabaseException, FileNotFoundException {
+
+ // Open a database in the environment to verify the data_dir
+ // has been set correctly.
+ DatabaseConfig dbconfig = new DatabaseConfig();
+
+ // The database is DB_BTREE.
+ dbconfig.setAllowCreate(true);
+ dbconfig.setMode(0644);
+ dbconfig.setType(DatabaseType.BTREE);
+ Database db=dbenv.openDatabase(null,
+ "jEnvExample_db1.db", null, dbconfig);
+
+ // Close the database.
+ db.close();
+ }
+
+ private static void setupEnvironment(File home,
+ File dataDir,
+ OutputStream errs)
+ throws DatabaseException, FileNotFoundException {
+
+ // Create an environment object and initialize it for error reporting.
+ EnvironmentConfig config = new EnvironmentConfig();
+ config.setErrorStream(errs);
+ config.setErrorPrefix(progname);
+
+ //
+ // We want to specify the shared memory buffer pool cachesize,
+ // but everything else is the default.
+ //
+ config.setCacheSize(64 * 1024);
+
+ // Databases are in a separate directory.
+ config.addDataDir(dataDir);
+
+ // Open the environment with full transactional support.
+ config.setAllowCreate(true);
+ config.setInitializeCache(true);
+ config.setTransactional(true);
+ config.setInitializeLocking(true);
+
+ //
+ // open is declared to throw a FileNotFoundException, which normally
+ // shouldn't occur when allowCreate is set.
+ //
+ Environment dbenv = new Environment(home, config);
+
+ try {
+ // Start your application.
+ runApplication(dbenv);
+ } finally {
+ // Close the environment. Doing this in the finally block ensures
+ // it is done, even if an error is thrown.
+ dbenv.close();
+ }
+ }
+
+ private static void teardownEnvironment(File home,
+ File dataDir,
+ OutputStream errs)
+ throws DatabaseException, FileNotFoundException {
+
+ // Remove the shared database regions.
+ EnvironmentConfig config = new EnvironmentConfig();
+
+ config.setErrorStream(errs);
+ config.setErrorPrefix(progname);
+ config.addDataDir(dataDir);
+ Environment.remove(home, true, config);
+ }
+
+ private static void usage() {
+ System.err.println("usage: java db.EnvExample [-h home] [-d data_dir]");
+ System.exit(1);
+ }
+
+ public static void main(String[] argv) {
+ //
+ // All of the shared database files live in home,
+ // but data files live in dataDir.
+ //
+ // Using Berkeley DB in C/C++, we need to allocate two elements
+ // in the array and set config[1] to NULL. This is not
+ // necessary in Java.
+ //
+ File home = new File("TESTDIR");
+ File dataDir = new File("data");
+
+ for (int i = 0; i < argv.length; ++i) {
+ if (argv[i].equals("-h")) {
+ if (++i >= argv.length)
+ usage();
+ home = new File(argv[i]);
+ } else if (argv[i].equals("-d")) {
+ if (++i >= argv.length)
+ usage();
+ dataDir = new File(argv[i]);
+ } else if (argv[i].equals("-u")) {
+ usage();
+ }
+ }
+
+ try {
+ System.out.println("Setup env");
+ setupEnvironment(home, dataDir, System.err);
+
+ System.out.println("Teardown env");
+ teardownEnvironment(home, dataDir, System.err);
+ } catch (DatabaseException dbe) {
+ System.err.println(progname + ": environment open: " + dbe.toString());
+ System.exit (1);
+ } catch (FileNotFoundException fnfe) {
+ System.err.println(progname + ": unexpected open environment error " + fnfe);
+ System.exit (1);
+ }
+ }
+
+}