Package org.apache.zookeeper.server.persistence

Class FileTxnLog.FileTxnIterator

  • All Implemented Interfaces:
    TxnLog.TxnIterator
    Enclosing class:
    FileTxnLog
    public static class FileTxnLog.FileTxnIterator
extends java.lang.Object
implements TxnLog.TxnIterator
    this class implements the txnlog iterator interface which is used for reading the transaction logs

    • Constructor Summary

      Constructors 
      Constructor Description
      FileTxnIterator​(java.io.File logDir, long zxid)
      create an iterator over a transaction database directory

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void close()
      close the iterator and release the resources.
      protected org.apache.jute.InputArchive createInputArchive​(java.io.File logFile)
      Invoked to indicate that the input stream has been created.
      TxnHeader getHeader()
      reutrn the current header
      org.apache.jute.Record getTxn()
      return the current transaction
      protected void inStreamCreated​(org.apache.jute.InputArchive ia, java.io.InputStream is)
      read the header from the inputarchive
      protected java.util.zip.Checksum makeChecksumAlgorithm()
      create a checksum algorithm
      boolean next()
      the iterator that moves to the next transaction

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • FileTxnIterator

        public FileTxnIterator​(java.io.File logDir,
                       long zxid)
                throws java.io.IOException
        create an iterator over a transaction database directory
        Parameters:
        logDir - the transaction database directory
        zxid - the zxid to start reading from
        Throws:
        java.io.IOException

    • Method Detail

      • inStreamCreated

        protected void inStreamCreated​(org.apache.jute.InputArchive ia,
                               java.io.InputStream is)
                        throws java.io.IOException
        read the header from the inputarchive
        Parameters:
        ia - the inputarchive to be read from
        is - the inputstream
        Throws:
        java.io.IOException

      • createInputArchive

        protected org.apache.jute.InputArchive createInputArchive​(java.io.File logFile)
                                                   throws java.io.IOException
        Invoked to indicate that the input stream has been created.
        Parameters:
        ia - input archive
        is - file input stream associated with the input archive.
        Throws:
        java.io.IOException

      • makeChecksumAlgorithm

        protected java.util.zip.Checksum makeChecksumAlgorithm()
        create a checksum algorithm
        Returns:
        the checksum algorithm

      • next

        public boolean next()
             throws java.io.IOException
        the iterator that moves to the next transaction
        Specified by:
        next in interface TxnLog.TxnIterator
        Returns:
        true if there is more transactions to be read false if not.
        Throws:
        java.io.IOException

      • getTxn

        public org.apache.jute.Record getTxn()
        return the current transaction
        Specified by:
        getTxn in interface TxnLog.TxnIterator
        Returns:
        the current transaction that is read

      • close

        public void close()
           throws java.io.IOException
        close the iterator and release the resources.
        Specified by:
        close in interface TxnLog.TxnIterator
        Throws:
        java.io.IOException