com.sleepycat.je.log.entry
Class INLogEntry

java.lang.Object
  com.sleepycat.je.log.entry.BaseEntry
      com.sleepycat.je.log.entry.INLogEntry

All Implemented Interfaces:

INContainingEntry, LogEntry, NodeLogEntry, java.lang.Cloneable

public class INLogEntry
extends BaseEntry
implements LogEntry, NodeLogEntry, INContainingEntry

INLogEntry embodies all IN log entries. On disk, an IN log entry contains:

        IN
        database id
        obsolete LSN  -- in version 2
 

Field Summary

Fields inherited from class com.sleepycat.je.log.entry.BaseEntry

entryType, logClass

Constructor Summary

INLogEntry(java.lang.Class<? extends IN> INClass)
Construct a log entry for reading.

INLogEntry(IN in)
Construct a log entry for writing to the log.

Method Summary

java.lang.Object	clone()
java.lang.StringBuffer	dumpEntry(java.lang.StringBuffer sb, boolean verbose) Print out the contents of an entry.
DatabaseId	getDbId() All node entries have a database ID.
IN	getIN(EnvironmentImpl env)
long	getLsnOfIN(long lastReadLsn)
java.lang.Object	getMainItem()
long	getNodeId() Returns the node ID.
long	getObsoleteLsn() Returns the LSN of the prior version of this node.
int	getSize()
long	getTransactionId()
boolean	logicalEquals(LogEntry other)
void	readEntry(LogEntryHeader header, java.nio.ByteBuffer entryBuffer, boolean readFullItem) Read in an IN entry.
void	writeEntry(LogEntryHeader header, java.nio.ByteBuffer destBuffer) Serialize this object into the buffer.

Methods inherited from class com.sleepycat.je.log.entry.BaseEntry

countAsObsoleteWhenLogged, getLastLoggedSize, getLogType, postLogWork, setLogType, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.sleepycat.je.log.entry.LogEntry

countAsObsoleteWhenLogged, getLastLoggedSize, getLogType, postLogWork, setLogType

Constructor Detail

INLogEntry

public INLogEntry(java.lang.Class<? extends IN> INClass)

Construct a log entry for reading.

INLogEntry

public INLogEntry(IN in)

Construct a log entry for writing to the log.

Method Detail

readEntry

public void readEntry(LogEntryHeader header,
                      java.nio.ByteBuffer entryBuffer,
                      boolean readFullItem)
               throws DatabaseException

Read in an IN entry.

Specified by:

readEntry in interface LogEntry

Throws:

DatabaseException

getObsoleteLsn

public long getObsoleteLsn()

Returns the LSN of the prior version of this node. Used for counting the prior version as obsolete. If the offset of the LSN is zero, only the file number is known because we read a version 1 log entry.

dumpEntry

public java.lang.StringBuffer dumpEntry(java.lang.StringBuffer sb,
                                        boolean verbose)

Print out the contents of an entry.

Specified by:

dumpEntry in interface LogEntry

Specified by:

dumpEntry in class BaseEntry

getMainItem

public java.lang.Object getMainItem()

Specified by:

getMainItem in interface LogEntry

Returns:

the item in the log entry

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Specified by:

clone in interface LogEntry

Overrides:

clone in class java.lang.Object

Returns:

a shallow clone.

Throws:

java.lang.CloneNotSupportedException

getTransactionId

public long getTransactionId()

Specified by:

getTransactionId in interface LogEntry

Returns:

return the transaction id if this log entry is transactional, 0 otherwise.

See Also:

LogEntry.getTransactionId()

getSize

public int getSize()

Specified by:

getSize in interface LogEntry

Returns:

size of byte buffer needed to store this entry.

writeEntry

public void writeEntry(LogEntryHeader header,
                       java.nio.ByteBuffer destBuffer)

Description copied from interface: LogEntry

Serialize this object into the buffer.

Specified by:

writeEntry in interface LogEntry

destBuffer - is the destination buffer

See Also:

LogEntry.writeEntry(com.sleepycat.je.log.LogEntryHeader, java.nio.ByteBuffer)

getIN

public IN getIN(EnvironmentImpl env)
         throws DatabaseException

Specified by:

getIN in interface INContainingEntry

Returns:

the IN held within this log entry.

Throws:

DatabaseException

getNodeId

public long getNodeId()

Description copied from interface: NodeLogEntry

Returns the node ID. This value is redundant with the main item (Node) of a log entry. It is returned separately so that it can be obtained when the entry's main item (Node) is not loaded. Partial loading is an optimization for recovery.

Specified by:

getNodeId in interface NodeLogEntry

See Also:

NodeLogEntry.getNodeId()

getDbId

public DatabaseId getDbId()

Description copied from interface: NodeLogEntry

All node entries have a database ID.

Specified by:

getDbId in interface INContainingEntry

Specified by:

getDbId in interface NodeLogEntry

Returns:

the database id held within this log entry.

See Also:

INContainingEntry.getDbId()

getLsnOfIN

public long getLsnOfIN(long lastReadLsn)

Specified by:

getLsnOfIN in interface INContainingEntry

Returns:

the LSN that represents this IN. For a vanilla IN entry, it's the last lsn read by the log reader.

logicalEquals

public boolean logicalEquals(LogEntry other)

Specified by:

logicalEquals in interface LogEntry

Returns:

true if these two log entries are logically the same. Used for replication.

See Also:

INs from two different environments are never considered equal, because they have lsns that are environment-specific.