Examples of com.sleepycat.db.Transaction

com.sleepycat.db.Transaction
The Transaction object is the handle for a transaction. Methods off the transaction handle are used to configure, abort and commit the transaction. Transaction handles are provided to other Berkeley DB methods in order to transactionally protect those operations.
Transaction handles are not free-threaded; transactions handles may be used by multiple threads, but only serially, that is, the application must serialize access to the handle. Once the {@link com.sleepycat.db.Transaction#abort Transaction.abort}, {@link com.sleepycat.db.Transaction#commit Transaction.commit} or{@link com.sleepycat.db.Transaction#discard Transaction.discard}methods are called, the handle may not be accessed again, regardless of the success or failure of the method. In addition, parent transactions may not issue any Berkeley DB operations while they have active child transactions (child transactions that have not yet been committed or aborted) except for {@link com.sleepycat.db.Environment#beginTransaction Environment.beginTransaction}, {@link com.sleepycat.db.Transaction#abort Transaction.abort} and {@link com.sleepycat.db.Transaction#commit Transaction.commit}.
To obtain a transaction with default attributes:
```
 Transaction txn = myEnvironment.beginTransaction(null, null); 
```
To customize the attributes of a transaction:
```
 TransactionConfig config = new TransactionConfig(); config.setDirtyRead(true); Transaction txn = myEnvironment.beginTransaction(null, config); 
```

        int duration;
        Date end;
    
        Date veryStart = new Date();
        Date start = new Date();
        Transaction txn = env.beginTransaction(null, null);
        Directory store = null;


        if (VERBOSE) System.out.println("Writing files byte by byte");


        try {
            store = new DbDirectory(txn, index, blocks);


            for (int i = 0; i < count; i++) {
                String name = i + ".dat";
                int length = gen.nextInt() & LENGTH_MASK;
                IndexOutput file = store.createOutput(name);


                totalLength += length;


                for (int j = 0; j < length; j++) {
                    byte b = (byte)(gen.nextInt() & 0x7F);
                    file.writeByte(b);
                }
      
                file.close();
            }
        } catch (IOException e) {
            txn.abort();
            txn = null;
            throw e;
        } finally {
            if (txn != null)
                txn.commit();


            store.close();
        }


        end = new Date();


        if (VERBOSE) {
          duration = (int) (end.getTime() - start.getTime());
          System.out.print(duration);
          System.out.print(" total milliseconds to create, ");
          System.out.print(totalLength / duration);
          System.out.println(" kb/s");
        }


        try {
            txn = env.beginTransaction(null, null);
            store = new DbDirectory(txn, index, blocks);


            gen = new Random(seed);
            start = new Date();


            for (int i = 0; i < count; i++) {
                String name = i + ".dat";
                int length = gen.nextInt() & LENGTH_MASK;
                IndexInput file = store.openInput(name);


                if (file.length() != length)
                    throw new Exception("length incorrect");


                for (int j = 0; j < length; j++) {
                    byte b = (byte)(gen.nextInt() & 0x7F);


                    if (file.readByte() != b)
                        throw new Exception("contents incorrect");
                }


                file.close();
            }
        } catch (IOException e) {
            txn.abort();
            txn = null;
            throw e;
        } catch (DatabaseException e) {
            if (txn != null)
            {
                txn.abort();
                txn = null;
            }
            throw e;
        } finally {
            if (txn != null)
                txn.commit();


            store.close();
        }


        end = new Date();


        if (VERBOSE) {
          duration = (int) (end.getTime() - start.getTime());
          System.out.print(duration);
          System.out.print(" total milliseconds to read, ");
          System.out.print(totalLength / duration);
          System.out.println(" kb/s");
        }


        try {
            txn = env.beginTransaction(null, null);
            store = new DbDirectory(txn, index, blocks);


            gen = new Random(seed);
            start = new Date();


            for (int i = 0; i < count; i++) {
                String name = i + ".dat";
                store.deleteFile(name);
            }
        } catch (IOException e) {
            txn.abort();
            txn = null;
            throw e;
        } catch (DatabaseException e) {
            if (txn != null)
            {
                txn.abort();
                txn = null;
            }
            throw e;
        } finally {
            if (txn != null)
                txn.commit();


            store.close();
        }


        end = new Date();

View Full Code Here

        int duration;
        Date end;
    
        Date veryStart = new Date();
        Date start = new Date();
        Transaction txn = env.beginTransaction(null, null);
        Directory store = null;


        if (VERBOSE) System.out.println("Writing files as one byte array");


        try {
            store = new DbDirectory(txn, index, blocks);


            for (int i = 0; i < count; i++) {
                String name = i + ".dat";
                int length = gen.nextInt() & LENGTH_MASK;
                IndexOutput file = store.createOutput(name);
                byte[] data = new byte[length];


                totalLength += length;
                gen.nextBytes(data);
                file.writeBytes(data, length);
      
                file.close();
            }
        } catch (IOException e) {
            txn.abort();
            txn = null;
            throw e;
        } finally {
            if (txn != null)
                txn.commit();


            store.close();
        }


        end = new Date();


        if (VERBOSE) {
          duration = (int) (end.getTime() - start.getTime());
          System.out.print(duration);
          System.out.print(" total milliseconds to create, ");
          System.out.print(totalLength / duration);
          System.out.println(" kb/s");
        }


        try {
            txn = env.beginTransaction(null, null);
            store = new DbDirectory(txn, index, blocks);


            gen = new Random(seed);
            start = new Date();


            for (int i = 0; i < count; i++) {
                String name = i + ".dat";
                int length = gen.nextInt() & LENGTH_MASK;
                IndexInput file = store.openInput(name);
                
                if (file.length() != length)
                    throw new Exception("length incorrect");


                byte[] data = new byte[length];
                byte[] read = new byte[length];
                gen.nextBytes(data);
                file.readBytes(read, 0, length);


                if (!Arrays.equals(data, read))
                    throw new Exception("contents incorrect");


                file.close();
            }
        } catch (IOException e) {
            txn.abort();
            txn = null;
            throw e;
        } catch (DatabaseException e) {
            if (txn != null)
            {
                txn.abort();
                txn = null;
            }
            throw e;
        } finally {
            if (txn != null)
                txn.commit();


            store.close();
        }


        end = new Date();


        if (VERBOSE) {
          duration = (int) (end.getTime() - start.getTime());
          System.out.print(duration);
          System.out.print(" total milliseconds to read, ");
          System.out.print(totalLength / duration);
          System.out.println(" kb/s");
        }


        try {
            txn = env.beginTransaction(null, null);
            store = new DbDirectory(txn, index, blocks);


            gen = new Random(seed);
            start = new Date();


            for (int i = 0; i < count; i++) {
                String name = i + ".dat";
                store.deleteFile(name);
            }
        } catch (IOException e) {
            txn.abort();
            txn = null;
            throw e;
        } catch (DatabaseException e) {
            if (txn != null)
            {
                txn.abort();
                txn = null;
            }
            throw e;
        } finally {
            if (txn != null)
                txn.commit();


            store.close();
        }


        end = new Date();

View Full Code Here

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