Examples of org.apache.derby.iapi.services.io.FormatIdOutputStream

Package org.apache.derby.iapi.services.io

Examples of org.apache.derby.iapi.services.io.FormatIdOutputStream

org.apache.derby.iapi.services.io.FormatIdOutputStream
A stream for serializing objects with format id tags.
An ObjectOutput (henceforth 'out') preceeds objects it writes with a format id. The companion FormatIdInputStream (henceforth 'in') uses these format ids in parsing the stored data. The stream can be thought of as containing a sequence of (formatId,object) pairs interspersed with other data. The assumption is that out.writeObject() produces these pairs and in.readObject() uses the format ids to construct objects from the pairs that out.writeObject produced. The description below describes each supported pair and how in.readObject() processes it.
1. (NULL_FORMAT_ID, nothing) in.readObject() returns null.
2. (SRING_FORMAT_ID, UTF8 encoded string)in.readObject reads and returns this string.
3. (SERIALIZABLE_FORMAT_ID,serialized object) in.readObject() reads the object using java serialization and returns it.
4. (A format id for a Storable, isNull flag and object if isNull == false) (see note 1) in.readObject() reads the boolean isNull flag. If is null is true, in.readObject() returns a Storable object of the correct class which is null. If ifNull is false, in.readObject() restores the object using its readExternal() method.
5. (A format id for a Formatable which is not Storable, the stored object) (see note 1) in.readObject restores the object using its readExternal() method.
Note 1: The FormatIdInputStream uses Monitor.newInstanceFromIdentifier(format id) to get the class.
Note 2: An object may support more than one of the following interfaces Storable, Formatable, Serializable. In this case out.writeObject use the first of these interfaces which the object supports (based on the order listed here) to determine how to write the object.

    if (SanityManager.DEBUG)
      SanityManager.ASSERT(a.length >= CONTAINER_INFO_SIZE,
                 "header won't fit in array");


    ArrayOutputStream a_out = new ArrayOutputStream(a);
    FormatIdOutputStream outStream = new FormatIdOutputStream(a_out);


    int status = 0;
    if (getDroppedState()) status |= FILE_DROPPED;
    if (getCommittedDropState()) status |= FILE_COMMITTED_DROP;
    if (isReusableRecordId()) status |= FILE_REUSABLE_RECORDID;


    a_out.setPosition(0);
    a_out.setLimit(CONTAINER_INFO_SIZE);
    outStream.writeInt(formatIdInteger);
    outStream.writeInt(status);
    outStream.writeInt(pageSize);
    outStream.writeInt(spareSpace);
    outStream.writeInt(minimumRecordSize);
    outStream.writeShort(initialPages);
    outStream.writeShort(PreAllocSize);    // write spare1
    outStream.writeLong(firstAllocPageNumber);
    outStream.writeLong(firstAllocPageOffset);
    outStream.writeLong(containerVersion);
    outStream.writeLong(estimatedRowCount);
    outStream.writeLong(reusableRecordIdSequenceNumber);
    outStream.writeLong(0);    //Write spare3


    checksum.reset();
    checksum.update(a, 0, CONTAINER_INFO_SIZE - CHECKSUM_SIZE);


    // write the checksum to the array
    outStream.writeLong(checksum.getValue());


    a_out.clearLimit();
  }

View Full Code Here

    if (SanityManager.DEBUG)
      SanityManager.ASSERT(a.length >= CONTAINER_INFO_SIZE,
                 "header won't fit in array");


    ArrayOutputStream a_out = new ArrayOutputStream(a);
    FormatIdOutputStream outStream = new FormatIdOutputStream(a_out);


    int status = 0;
    if (getDroppedState()) status |= FILE_DROPPED;
    if (getCommittedDropState()) status |= FILE_COMMITTED_DROP;
    if (isReusableRecordId()) status |= FILE_REUSABLE_RECORDID;


    a_out.setPosition(0);
    a_out.setLimit(CONTAINER_INFO_SIZE);
    outStream.writeInt(formatIdInteger);
    outStream.writeInt(status);
    outStream.writeInt(pageSize);
    outStream.writeInt(spareSpace);
    outStream.writeInt(minimumRecordSize);
    outStream.writeShort(initialPages);
    outStream.writeShort(PreAllocSize);    // write spare1
    outStream.writeLong(firstAllocPageNumber);
    outStream.writeLong(firstAllocPageOffset);
    outStream.writeLong(containerVersion);
    outStream.writeLong(estimatedRowCount);
    outStream.writeLong(reusableRecordIdSequenceNumber);
    outStream.writeLong(0);    //Write spare3


    checksum.reset();
    checksum.update(a, 0, CONTAINER_INFO_SIZE - CHECKSUM_SIZE);


    // write the checksum to the array
    outStream.writeLong(checksum.getValue());


    a_out.clearLimit();
  }

View Full Code Here

      }
      checksumLogRecordSize = checksumLength  + LOG_RECORD_FIXED_OVERHEAD_SIZE;


      //streams required to convert a log record to raw byte array. 
      logOutputBuffer = new ArrayOutputStream(); 
      logicalOut = new FormatIdOutputStream(logOutputBuffer);


      /** initialize the buffer with space reserved for checksum log record in
       * the beginning of the log buffer; checksum record is written into
       * this space when buffer is switched or while doing direct write to the log file.
       */

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      }
      checksumLogRecordSize = checksumLength  + LOG_RECORD_FIXED_OVERHEAD_SIZE;


      //streams required to convert a log record to raw byte array. 
      logOutputBuffer = new ArrayOutputStream(); 
      logicalOut = new FormatIdOutputStream(logOutputBuffer);


      /** initialize the buffer with space reserved for checksum log record in
       * the beginning of the log buffer; checksum record is written into
       * this space when buffer is switched
       */

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    private void createOutStreams()
    {
        rawDataOut = new ArrayOutputStream();
        rawDataOut.setData(pageData);


        logicalDataOut = new FormatIdOutputStream(rawDataOut);
    }

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  private void createOutStreams()
  {
    rawDataOut = new ArrayOutputStream();
    rawDataOut.setData(pageData);


    logicalDataOut = new FormatIdOutputStream(rawDataOut);
  }

View Full Code Here

  private void createOutStreams()
  {
    rawDataOut = new ArrayOutputStream();
    rawDataOut.setData(pageData);


    logicalDataOut = new FormatIdOutputStream(rawDataOut);
  }

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      }
      checksumLogRecordSize = checksumLength  + LOG_RECORD_FIXED_OVERHEAD_SIZE;


      //streams required to convert a log record to raw byte array. 
      logOutputBuffer = new ArrayOutputStream(); 
      logicalOut = new FormatIdOutputStream(logOutputBuffer);


      /** initialize the buffer with space reserved for checksum log record in
       * the beginning of the log buffer; checksum record is written into
       * this space when buffer is switched or while doing direct write to the log file.
       */

View Full Code Here

  public void load(RowSource rowSource) 
        throws StandardException 
    {
    // use this output stream to buffer rows before inserting into file.
    out                 = new DynamicByteArrayOutputStream(bufferSize);
    logicalDataOut      = new FormatIdOutputStream(out);
    boolean encrypted   = dataFactory.databaseEncrypted();


    // reserve the first dataFactory.getEncryptionBlockSize() - 1 bytes, if the database is 
        // encrypted These reserved bytes will be used to pad the byte array if
        // it is not dataFactory.getEncryptionBlockSize() aligned.

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  */
  public FileLogger(LogToFile logFactory) {


    this.logFactory = logFactory;
    logOutputBuffer = new DynamicByteArrayOutputStream(1024); // init size 1K
    logicalOut = new FormatIdOutputStream(logOutputBuffer);


    // logIn and logOutputBuffer must share the same buffer because they
    // combined to form an IO stream to access the same log record.
    // 
    // Before each use of logIn, you must reset logIn's data to the

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