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, java.lang.Cloneable

public class INLogEntry
extends BaseEntry
implements LogEntry, INContainingEntry

INLogEntry embodies all IN log entries. On disk, an IN log entry contains (pre version 6)

        IN
        database id
        obsolete LSN  -- in version 2

 (version 6)
        database id
        obsolete LSN
        IN
 

Field Summary

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

entryType

Constructor Summary

Constructors

Constructor and Description
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

Methods

Modifier and Type	Method and Description
java.lang.StringBuilder	dumpEntry(java.lang.StringBuilder sb, boolean verbose) Print out the contents of an entry.
void	dumpRep(java.lang.StringBuilder sb) Never replicated.
DatabaseId	getDbId()
IN	getIN(DatabaseImpl dbImpl)
java.lang.Object	getMainItem()
long	getNodeId()
long	getPrevDeltaLsn()
long	getPrevFullLsn()
int	getSize()
long	getTransactionId()
boolean	logicalEquals(LogEntry other)
void	readEntry(EnvironmentImpl envImpl, LogEntryHeader header, java.nio.ByteBuffer entryBuffer) 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

clone, getLastLoggedSize, getLogType, getNoArgsConstructor, getResolvedItem, isDeleted, newInstanceOfType, newInstanceOfType, postFetchInit, 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

clone, getLastLoggedSize, getLogType, getResolvedItem, isDeleted, 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(EnvironmentImpl envImpl,
             LogEntryHeader header,
             java.nio.ByteBuffer entryBuffer)

Read in an IN entry.

Specified by:

readEntry in interface LogEntry

getPrevFullLsn

public long getPrevFullLsn()

Specified by:

getPrevFullLsn in interface INContainingEntry

Returns:

the LSN of the prior full version of this node, or NULL_LSN if there is no prior full version. 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.

getPrevDeltaLsn

public long getPrevDeltaLsn()

Specified by:

getPrevDeltaLsn in interface INContainingEntry

Returns:

the LSN of the prior delta version of this node, or NULL_LSN if the prior version is a full version. 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.StringBuilder dumpEntry(java.lang.StringBuilder sb,
                                boolean verbose)

Print out the contents of an entry.

Specified by:

dumpEntry in interface LogEntry

Specified by:

dumpEntry in class BaseEntry

dumpRep

public void dumpRep(java.lang.StringBuilder sb)

Never replicated.

Specified by:

dumpRep in interface LogEntry

getMainItem

public java.lang.Object getMainItem()

Specified by:

getMainItem in interface LogEntry

Returns:

the item in the log entry

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(DatabaseImpl dbImpl)

Specified by:

getIN in interface INContainingEntry

Returns:

the IN held within this log entry.

getNodeId

public long getNodeId()

Returns:

the IN's node ID.

getDbId

public DatabaseId getDbId()

Specified by:

getDbId in interface INContainingEntry

Specified by:

getDbId in interface LogEntry

Returns:

the ID of the database containing this entry, or null if this entry type is not part of a database.

See Also:

INContainingEntry.getDbId()

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.