1 files changed, 156 insertions, 0 deletions
diff --git a/db-4.8.30/examples_java/src/collections/hello/HelloDatabaseWorld.java b/db-4.8.30/examples_java/src/collections/hello/HelloDatabaseWorld.java
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index 0000000..6791dff
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+++ b/db-4.8.30/examples_java/src/collections/hello/HelloDatabaseWorld.java
@@ -0,0 +1,156 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 2002-2009 Oracle.  All rights reserved.
+ *
+ * $Id$
+ */
+
+package collections.hello;
+
+import java.io.File;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.SortedMap;
+
+import com.sleepycat.bind.serial.ClassCatalog;
+import com.sleepycat.bind.serial.SerialBinding;
+import com.sleepycat.bind.serial.StoredClassCatalog;
+import com.sleepycat.bind.tuple.TupleBinding;
+import com.sleepycat.collections.StoredSortedMap;
+import com.sleepycat.collections.TransactionRunner;
+import com.sleepycat.collections.TransactionWorker;
+import com.sleepycat.db.Database;
+import com.sleepycat.db.DatabaseConfig;
+import com.sleepycat.db.DatabaseType;
+import com.sleepycat.db.Environment;
+import com.sleepycat.db.EnvironmentConfig;
+
+/**
+ * @author Mark Hayes
+ */
+public class HelloDatabaseWorld implements TransactionWorker {
+
+    private static final String[] INT_NAMES = {
+        "Hello", "Database", "World",
+    };
+    private static boolean create = true;
+
+    private Environment env;
+    private ClassCatalog catalog;
+    private Database db;
+    private SortedMap map;
+
+    /** Creates the environment and runs a transaction */
+    public static void main(String[] argv)
+        throws Exception {
+
+        String dir = "./tmp";
+
+        // environment is transactional
+        EnvironmentConfig envConfig = new EnvironmentConfig();
+        envConfig.setTransactional(true);
+        envConfig.setInitializeCache(true);
+        envConfig.setInitializeLocking(true);
+        if (create) {
+            envConfig.setAllowCreate(true);
+        }
+        Environment env = new Environment(new File(dir), envConfig);
+
+        // create the application and run a transaction
+        HelloDatabaseWorld worker = new HelloDatabaseWorld(env);
+        TransactionRunner runner = new TransactionRunner(env);
+        try {
+            // open and access the database within a transaction
+            runner.run(worker);
+        } finally {
+            // close the database outside the transaction
+            worker.close();
+        }
+    }
+
+    /** Creates the database for this application */
+    private HelloDatabaseWorld(Environment env)
+        throws Exception {
+
+        this.env = env;
+        open();
+    }
+
+    /** Performs work within a transaction. */
+    public void doWork()
+        throws Exception {
+
+        writeAndRead();
+    }
+
+    /** Opens the database and creates the Map. */
+    private void open()
+        throws Exception {
+
+        // use a generic database configuration
+        DatabaseConfig dbConfig = new DatabaseConfig();
+        dbConfig.setTransactional(true);
+        if (create) {
+            dbConfig.setAllowCreate(true);
+            dbConfig.setType(DatabaseType.BTREE);
+        }
+
+        // catalog is needed for serial bindings (java serialization)
+        Database catalogDb = env.openDatabase(null, "catalog", null, dbConfig);
+        catalog = new StoredClassCatalog(catalogDb);
+
+        // use Integer tuple binding for key entries
+        TupleBinding keyBinding =
+            TupleBinding.getPrimitiveBinding(Integer.class);
+
+        // use String serial binding for data entries
+        SerialBinding dataBinding = new SerialBinding(catalog, String.class);
+
+        this.db = env.openDatabase(null, "helloworld", null, dbConfig);
+
+        // create a map view of the database
+        this.map = new StoredSortedMap(db, keyBinding, dataBinding, true);
+    }
+
+    /** Closes the database. */
+    private void close()
+        throws Exception {
+
+        if (catalog != null) {
+            catalog.close();
+            catalog = null;
+        }
+        if (db != null) {
+            db.close();
+            db = null;
+        }
+        if (env != null) {
+            env.close();
+            env = null;
+        }
+    }
+
+    /** Writes and reads the database via the Map. */
+    private void writeAndRead() {
+
+        // check for existing data
+        Integer key = new Integer(0);
+        String val = (String) map.get(key);
+        if (val == null) {
+            System.out.println("Writing data");
+            // write in reverse order to show that keys are sorted
+            for (int i = INT_NAMES.length - 1; i >= 0; i -= 1) {
+                map.put(new Integer(i), INT_NAMES[i]);
+            }
+        }
+        // get iterator over map entries
+        Iterator iter = map.entrySet().iterator();
+        System.out.println("Reading data");
+        while (iter.hasNext()) {
+            Map.Entry entry = (Map.Entry) iter.next();
+            System.out.println(entry.getKey().toString() + ' ' +
+                               entry.getValue());
+        }
+    }
+}