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// File TxnGuide.java
package je.txn;
import java.io.File;
import com.sleepycat.bind.serial.StoredClassCatalog;
import com.sleepycat.je.Database;
import com.sleepycat.je.DatabaseConfig;
import com.sleepycat.je.DatabaseException;
import com.sleepycat.je.Environment;
import com.sleepycat.je.EnvironmentConfig;
public class TxnGuide {
private static String myEnvPath = "./";
private static String dbName = "mydb.db";
private static String cdbName = "myclassdb.db";
// DB handles
private static Database myDb = null;
private static Database myClassDb = null;
private static Environment myEnv = null;
private static int NUMTHREADS = 5;
private static void usage() {
System.out.println("TxnGuide [-h <env directory>]");
System.exit(-1);
}
public static void main(String args[]) {
try {
// Parse the arguments list
parseArgs(args);
// 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);
threadArray[i].start();
}
for (int i = 0; i < NUMTHREADS; i++) {
threadArray[i].join();
}
} catch (Exception e) {
System.err.println("TxnGuide: " + 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();
myEnvConfig.setAllowCreate(true);
myEnvConfig.setTransactional(true);
// Environment handles are free-threaded in JE,
// so we do not have to do anything to cause the
// environment handle to be free-threaded.
// Set up the database
DatabaseConfig myDbConfig = new DatabaseConfig();
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.
// Open the environment
myEnv = new Environment(new File(myEnvPath), // 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
dbName, // Database file 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
cdbName, // Database file name
myDbConfig);
}
private static void closeEnv() {
System.out.println("Closing env and databases");
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 TxnGuide() {}
private static void parseArgs(String args[]) {
for(int i = 0; i < args.length; ++i) {
if (args[i].startsWith("-")) {
switch(args[i].charAt(1)) {
case 'h':
myEnvPath = new String(args[++i]);
break;
default:
usage();
}
}
}
}
}
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