com.sleepycat.je.tree

Class LN

java.lang.Object

com.sleepycat.je.tree.Node

com.sleepycat.je.tree.LN

All Implemented Interfaces:

Loggable

Direct Known Subclasses:

DupCountLN, FileSummaryLN, MapLN, NameLN

public class LN
extends Node
implements Loggable

An LN represents a Leaf Node in the JE tree.

Constructor Summary

Constructors

Constructor and Description
LN() Create an empty LN, to be filled in from the log.
LN(byte[] data, EnvironmentImpl envImpl, boolean replicated) Create a new LN from a byte array.
LN(DatabaseEntry dbt, EnvironmentImpl envImpl, boolean replicated) Create a new LN from a DatabaseEntry.

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.String	beginTag()
protected boolean	canBeAncestor(boolean targetContainsDuplicates) A LN can never be the ancestor of another node.
byte[]	copyData()
long	delete(DatabaseImpl database, byte[] lnKey, byte[] dupKey, long oldLsn, Locker locker, ReplicationContext repContext) Delete this LN's data and log the new version.
void	dumpLog(java.lang.StringBuffer sb, boolean verbose) Write the object into the string buffer for log dumping.
protected void	dumpLogAdditional(java.lang.StringBuffer sb, boolean verbose)
java.lang.String	dumpString(int nSpaces, boolean dumpTags)
java.lang.String	endTag()
byte[]	getData()
int	getLastLoggedSize() Returns the total last logged log size, including the LNLogEntry overhead of this LN when it was last logged and the log entry header.
int	getLogSize()
LogEntryType	getLogType()
long	getMemorySizeIncludedByParent() Compute the approximate size of this node in memory for evictor invocation purposes.
protected LogEntryType	getTransactionalLogType() Log type for transactional entries
boolean	isDeleted()
boolean	isDirty()
protected boolean	isSoughtNode(long nid, CacheMode cacheMode) A LN can never be a child in the search chain.
long	log(EnvironmentImpl env, DatabaseImpl databaseImpl, byte[] key, long oldLsn, Locker locker, boolean backgroundIO, ReplicationContext repContext) Log this LN and clear the dirty flag.
boolean	logicalEquals(Loggable other)
long	modify(byte[] newData, DatabaseImpl database, byte[] lnKey, long oldLsn, Locker locker, ReplicationContext repContext) Modify the LN's data and log the new version.
long	optionalLog(EnvironmentImpl env, DatabaseImpl databaseImpl, byte[] key, long oldLsn, Locker locker, ReplicationContext repContext) Log this LN if it's not part of a deferred-write db.
long	optionalLogProvisional(EnvironmentImpl env, DatabaseImpl databaseImpl, byte[] key, long oldLsn, ReplicationContext repContext) Log a provisional, non-txnal version of an LN.
void	readFromLog(java.nio.ByteBuffer itemBuffer, byte entryVersion) Initialize this object from the data in itemBuf.
void	releaseMemoryBudget() Release the memory budget for any objects referenced by this LN.
void	setDirty()
void	setLastLoggedSize(int size) Saves the last logged size.
void	writeToLog(java.nio.ByteBuffer logBuffer) Serialize this object into the buffer.

Methods inherited from class com.sleepycat.je.tree.Node

containsDuplicates, dump, getLevel, getNodeId, getTransactionId, getType, latchShared, latchShared, postFetchInit, releaseLatch, shortDescription, toString, verify

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.sleepycat.je.log.Loggable

getTransactionId

Constructor Detail

LN

public LN()

Create an empty LN, to be filled in from the log.

LN

public LN(byte[] data,
  EnvironmentImpl envImpl,
  boolean replicated)

Create a new LN from a byte array.

LN

public LN(DatabaseEntry dbt,
  EnvironmentImpl envImpl,
  boolean replicated)

Create a new LN from a DatabaseEntry.

Method Detail

getData

public byte[] getData()

copyData

public byte[] copyData()

isDeleted

public boolean isDeleted()

isDirty

public boolean isDirty()

setDirty

public void setDirty()

isSoughtNode

protected boolean isSoughtNode(long nid,
                   CacheMode cacheMode)

A LN can never be a child in the search chain.

Specified by:

isSoughtNode in class Node

Returns:

true if you're an IN in the search path

canBeAncestor

protected boolean canBeAncestor(boolean targetContainsDuplicates)

A LN can never be the ancestor of another node.

Specified by:

canBeAncestor in class Node

Returns:

true if you can be the ancestor of the target IN. Currently the determining factor is whether the target IN contains duplicates.

delete

public long delete(DatabaseImpl database,
          byte[] lnKey,
          byte[] dupKey,
          long oldLsn,
          Locker locker,
          ReplicationContext repContext)
            throws DatabaseException

Delete this LN's data and log the new version.

Throws:

DatabaseException

modify

public long modify(byte[] newData,
          DatabaseImpl database,
          byte[] lnKey,
          long oldLsn,
          Locker locker,
          ReplicationContext repContext)
            throws DatabaseException

Modify the LN's data and log the new version.

Parameters:

repContext - indicates whether this LN is part of the replication stream. If this environment is a client node, repContext has the VLSN to be used when logging the LN. If this environment is a master, it indicates that the LN should be broadcast.

Throws:

DatabaseException

getMemorySizeIncludedByParent

public long getMemorySizeIncludedByParent()

Compute the approximate size of this node in memory for evictor invocation purposes.

Overrides:

getMemorySizeIncludedByParent in class Node

releaseMemoryBudget

public void releaseMemoryBudget()

Release the memory budget for any objects referenced by this LN. For now, only release treeAdmin memory, because treeMemory is handled in aggregate at the IN level. Over time, transition all of the LN's memory budget to this, so we update the memory budget counters more locally. Called when we are releasing a LN for garbage collection.

beginTag

public java.lang.String beginTag()

endTag

public java.lang.String endTag()

dumpString

public java.lang.String dumpString(int nSpaces,
                          boolean dumpTags)

log

public long log(EnvironmentImpl env,
       DatabaseImpl databaseImpl,
       byte[] key,
       long oldLsn,
       Locker locker,
       boolean backgroundIO,
       ReplicationContext repContext)
         throws DatabaseException

Log this LN and clear the dirty flag. Whether it's logged as a transactional entry or not depends on the type of locker.

Parameters:

env - the environment.

dbId - database id of this node. (Not stored in LN)

key - key of this node. (Not stored in LN)

oldLsn - is the LSN of the previous version or null.

locker - owning locker.

repContext - indicates whether this LN is part of the replication stream. If this environment is a client node, repContext has the VLSN to be used when logging the LN. If this environment is a master, it indicates that the LN should be broadcast.

Throws:

DatabaseException

optionalLog

public long optionalLog(EnvironmentImpl env,
               DatabaseImpl databaseImpl,
               byte[] key,
               long oldLsn,
               Locker locker,
               ReplicationContext repContext)
                 throws DatabaseException

Log this LN if it's not part of a deferred-write db. Whether it's logged as a transactional entry or not depends on the type of locker.

Parameters:

env - the environment.

dbId - database id of this node. (Not stored in LN)

key - key of this node. (Not stored in LN)

oldLsn - is the LSN of the previous version or NULL_LSN.

locker - owning locker.

repContext - indicates whether this LN is part of the replication stream. If this environment is a client node, repContext has the VLSN to be used when logging the LN. If this environment is a master, it indicates that the LN should be broadcast.

Throws:

DatabaseException

optionalLogProvisional

public long optionalLogProvisional(EnvironmentImpl env,
                          DatabaseImpl databaseImpl,
                          byte[] key,
                          long oldLsn,
                          ReplicationContext repContext)
                            throws DatabaseException

Log a provisional, non-txnal version of an LN.

Parameters:

env - the environment.

dbId - database id of this node. (Not stored in LN)

key - key of this node. (Not stored in LN)

oldLsn - is the LSN of the previous version or NULL_LSN.

Throws:

DatabaseException

getTransactionalLogType

protected LogEntryType getTransactionalLogType()

Log type for transactional entries

getLogType

public LogEntryType getLogType()

Specified by:

getLogType in class Node

See Also:

Node.getLogType()

getLastLoggedSize

public int getLastLoggedSize()

Returns the total last logged log size, including the LNLogEntry overhead of this LN when it was last logged and the log entry header. Used for computing obsolete size when an LNLogEntry is not in hand.

setLastLoggedSize

public void setLastLoggedSize(int size)

Saves the last logged size.

getLogSize

public int getLogSize()

Specified by:

getLogSize in interface Loggable

Overrides:

getLogSize in class Node

Returns:

number of bytes used to store this object.

See Also:

Loggable.getLogSize()

writeToLog

public void writeToLog(java.nio.ByteBuffer logBuffer)

Description copied from interface: Loggable

Serialize this object into the buffer.

Specified by:

writeToLog in interface Loggable

Overrides:

writeToLog in class Node

Parameters:

logBuffer - is the destination buffer

See Also:

Loggable.writeToLog(java.nio.ByteBuffer)

readFromLog

public void readFromLog(java.nio.ByteBuffer itemBuffer,
               byte entryVersion)
                 throws LogException

Description copied from interface: Loggable

Initialize this object from the data in itemBuf.

Specified by:

readFromLog in interface Loggable

Overrides:

readFromLog in class Node

Throws:

LogException

See Also:

Loggable.readFromLog(java.nio.ByteBuffer, byte)

logicalEquals

public boolean logicalEquals(Loggable other)

Specified by:

logicalEquals in interface Loggable

Returns:

true if these two loggable items are logically the same. Used for replication testing.

See Also:

Loggable.logicalEquals(com.sleepycat.je.log.Loggable)

dumpLog

public void dumpLog(java.lang.StringBuffer sb,
           boolean verbose)

Description copied from interface: Loggable

Write the object into the string buffer for log dumping. Each object should be dumped without indentation or new lines and should be valid XML.

Specified by:

dumpLog in interface Loggable

Overrides:

dumpLog in class Node

Parameters:

sb - destination string buffer

verbose - if true, dump the full, verbose version

See Also:

Loggable.dumpLog(java.lang.StringBuffer, boolean)

dumpLogAdditional

protected void dumpLogAdditional(java.lang.StringBuffer sb,
                     boolean verbose)