com.sleepycat.je.log

Class ReplicationContext

java.lang.Object

com.sleepycat.je.log.ReplicationContext

Direct Known Subclasses:

DbOpReplicationContext

public class ReplicationContext
extends Object

ReplicationContext provides context about high-level operations so that the logging level can determine which replication related actions are required for a given Loggable item. Those lower level actions are: - does a log entry need to be logged with a VLSN generated by this (master) node? - does the log entry need to be logged with the VLSN which accompanied a replication message? - do we need to wait for PERM acks after logging an entry? - do we need to record the client VLSN that was just written to the log? ReplicationContext subclasses may hold additional information about the logical operation which instigated logging, so that this can be added to the log entry. All LogEntryType(s) have a "replicationPossible" attribute. For example, INs will never be replicated, but LN_TX's may or may not be replicated, depending on whether the owning database is replicated. If a LogEntryType will never be replicated, it should be logged with the static ReplicationContext.NO_REPLICATE instance. If replication is possible, the replication context may be: - one allocated for this operation, as the result of client apply - the static instance MASTER, if this node is the replication master - the static instance NO_REPLICATE, if this is a local operation

Field Summary

Fields

Modifier and Type	Field and Description
static ReplicationContext	MASTER
static ReplicationContext	NO_REPLICATE

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ReplicationContext(boolean inReplicationStream)
	ReplicationContext(VLSN clientVLSN) Used to pass the VLSN held in an arriving message down to the logging levels.
	ReplicationContext(VLSN clientVLSN, boolean inReplicationStream) Used to pass the VLSN held in a migrated LN down to the logging levels.

Method Summary

Modifier and Type	Method and Description
VLSN	getClientVLSN()
DbOperationType	getDbOperationType()
boolean	inReplicationStream()
boolean	mustGenerateVLSN()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

MASTER

public static final ReplicationContext MASTER

NO_REPLICATE

public static final ReplicationContext NO_REPLICATE

Constructor Detail

ReplicationContext

protected ReplicationContext(boolean inReplicationStream)

ReplicationContext

public ReplicationContext(VLSN clientVLSN)

Used to pass the VLSN held in an arriving message down to the logging levels.

ReplicationContext

public ReplicationContext(VLSN clientVLSN,
                          boolean inReplicationStream)

Used to pass the VLSN held in a migrated LN down to the logging levels.

Method Detail

getClientVLSN

public VLSN getClientVLSN()

Returns:

the VLSN that arrived in the replication message which instigated this Loggable item.

inReplicationStream

public boolean inReplicationStream()

Returns:

true if this loggable item is part of the replication stream

mustGenerateVLSN

public boolean mustGenerateVLSN()

Returns:

true if this node is the master, and should generate a VLSN for this log entry

getDbOperationType

public DbOperationType getDbOperationType()

Returns:

the type of database operation in progress. For the default case, we return DbOperationType.NONE.

toString

public String toString()

Overrides:

toString in class Object