/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2005, 2015 Oracle and/or its affiliates. All rights reserved.
*
* $Id$
*/
// File TxnGuideInMemory.java
package db.txn;
import com.sleepycat.bind.serial.StoredClassCatalog;
import com.sleepycat.db.Database;
import com.sleepycat.db.DatabaseConfig;
import com.sleepycat.db.DatabaseException;
import com.sleepycat.db.DatabaseType;
import com.sleepycat.db.LockDetectMode;
import com.sleepycat.db.Environment;
import com.sleepycat.db.EnvironmentConfig;
import java.io.File;
import java.io.FileNotFoundException;
public class TxnGuideInMemory {
// DB handles
private static Database myDb = null;
private static Database myClassDb = null;
private static Environment myEnv = null;
private static int NUMTHREADS = 5;
public static void main(String args[]) {
try {
// Open the environment and databases
openEnv();
// Get our class catalog (used to serialize objects)
StoredClassCatalog classCatalog =
new StoredClassCatalog(myClassDb);
// Start the threads
DBWriter[] threadArray;
threadArray = new DBWriter[NUMTHREADS];
for (int i = 0; i < NUMTHREADS; i++) {
threadArray[i] = new DBWriter(myEnv, myDb, classCatalog, true);
threadArray[i].start();
}
System.out.println("Threads started.\n");
for (int i = 0; i < NUMTHREADS; i++) {
threadArray[i].join();
}
} catch (Exception e) {
System.err.println("TxnGuideInMemory: " + e.toString());
e.printStackTrace();
} finally {
closeEnv();
}
System.out.println("All done.");
}
private static void openEnv() throws DatabaseException {
System.out.println("opening env");
// Set up the environment.
EnvironmentConfig myEnvConfig = new EnvironmentConfig();
// Region files are not backed by the filesystem, they are
// backed by heap memory.
myEnvConfig.setPrivate(true);
myEnvConfig.setAllowCreate(true);
myEnvConfig.setInitializeCache(true);
myEnvConfig.setInitializeLocking(true);
myEnvConfig.setInitializeLogging(true);
myEnvConfig.setThreaded(true);
myEnvConfig.setTransactional(true);
// EnvironmentConfig.setThreaded(true) is the default behavior
// in Java, so we do not have to do anything to cause the
// environment handle to be free-threaded.
// Indicate that we want db to internally perform deadlock
// detection. Also indicate that the transaction that has
// performed the least amount of write activity to
// receive the deadlock notification, if any.
myEnvConfig.setLockDetectMode(LockDetectMode.MINWRITE);
// Specify in-memory logging
myEnvConfig.setLogInMemory(true);
// Specify the size of the in-memory log buffer
// Must be large enough to handle the log data created by
// the largest transaction.
myEnvConfig.setLogBufferSize(10 * 1024 * 1024);
// Specify the size of the in-memory cache
// Set it large enough so that it won't page.
myEnvConfig.setCacheSize(10 * 1024 * 1024);
// Set up the database
DatabaseConfig myDbConfig = new DatabaseConfig();
myDbConfig.setType(DatabaseType.BTREE);
myDbConfig.setAllowCreate(true);
myDbConfig.setTransactional(true);
myDbConfig.setSortedDuplicates(true);
// no DatabaseConfig.setThreaded() method available.
// db handles in java are free-threaded so long as the
// env is also free-threaded.
try {
// Open the environment
myEnv = new Environment(null, // Env home
myEnvConfig);
// Open the database. Do not provide a txn handle. This open
// is autocommitted because DatabaseConfig.setTransactional()
// is true.
myDb = myEnv.openDatabase(null, // txn handle
null, // Database file name
null, // Database name
myDbConfig);
// Used by the bind API for serializing objects
// Class database must not support duplicates
myDbConfig.setSortedDuplicates(false);
myClassDb = myEnv.openDatabase(null, // txn handle
null, // Database file name
null, // Database name,
myDbConfig);
} catch (FileNotFoundException fnfe) {
System.err.println("openEnv: " + fnfe.toString());
System.exit(-1);
}
}
private static void closeEnv() {
System.out.println("Closing env");
if (myDb != null ) {
try {
myDb.close();
} catch (DatabaseException e) {
System.err.println("closeEnv: myDb: " +
e.toString());
e.printStackTrace();
}
}
if (myClassDb != null ) {
try {
myClassDb.close();
} catch (DatabaseException e) {
System.err.println("closeEnv: myClassDb: " +
e.toString());
e.printStackTrace();
}
}
if (myEnv != null ) {
try {
myEnv.close();
} catch (DatabaseException e) {
System.err.println("closeEnv: " + e.toString());
e.printStackTrace();
}
}
}
private TxnGuideInMemory() {}
}